Table of contents

Railway container terminals are important hubs of hinterland logistics transportation. Gantry cranes, the main handling equipment of it, are the key to promote its efficiency. According to the operating area, simultaneity of loading and unloading and operating track number, the scheduling problem could be categorized into different modes. This article compared two of them: mode I (single-track, fixed-area, single cycle handling mode) and mode II (multi-track, fixed-area, hybrid handling mode), consequently pointing out their strengths and weaknesses.

The temperature control of beer fermentation has many features, such as great inertia, time delay, non-linear, time-variant. The effect of traditional PID is poor. In order to improve control effect, this paper proposes a BP neural network PID control algorithm.By add momentum to reduces vibration time and accelerates the convergence of the neural network. Adjusts PID parameters online by optimized BP neural network, it solves the problems of slow response and large overshoot of traditional PID control method. And control the temperature of beer fermentation tank by PID controller. Finally, the simulation that using MATLAB for beer fermentation tank proved this controller has real-time performance, small overshoot, robustness, rapid response speed and other advantages.

This article is based on familiarization with the technical methods of the standardized highspeed train operation diagram. Investigated the existing problems of the train working diagram of highspeed train between Beijing and Shanghai. In the process of train operation diagram compilation,analyze the difficulties based on the normalized. The operating diagrams which optimized from the various processes have been prepared from organization. The optimization plan of the normalized train operation diagram on the Jinghu highspeed train was proposed as well.

This paper discusses problem about improving the utilization ratio of gantry cranes, accelerating the container circulating of railway container terminal, at the same time, reducing the waiting time of trains and trucks in the station. We mainly study at the mode named multi-line flexible range loading and unloading hybrid scheduling. In the case of two train lines and the truck line, the working area of gantry crane is unlimited. This mode is proposed for sequence optimization of gantry crane loading and unloading simultaneously, as well as shortening the accomplishing time of the most difficult task for the all gantry cranes.

The region of the iris reflects the health status of human body organs. Through the detection of iris pathological features, the potential diseases of the human body can be initially detected, and the examination and treatment of related diseases can be further carried out. There are a lot of kinds of iris pathological features, but this paper mainly studies the detection of iris hyper pigmentation. First of all, the iris image is preprocessed in this paper. Then, the Otsu image segmentation algorithm and the Canny edge detection algorithm are used to realize the detection of iris hyper pigmentation. Finally, the GUI (Graphical Use Interface) of iris hyper pigmentation is designed by Matlab in this paper.

A spin-coating used manipulator system is designed, which mainly includes the mechanical system design of coating machine, hardware circuit design and software design of the control system. Operational principle of spin-coating used manipulator in this design can be elaborated as: the manipulator grasps a workpiece to rotate fully in the liquid for coating, the whole process can be controlled by compiled SCM programs, so as to meet different coating demands.

At present, China Railway Express are developing faster and faster. Many scholars believe that the transfer assembly is the general trend of the future development of the China Railway Express, and Urumqi is a good choice as a centre of assembly because of its geographical advantage. This paper builds a mathematical model for quantitative analysis and explores the domestic container class. The effect of the average travel speed of the column on the transport organization.

This paper introduces the background and significance of the study on the dispatching optimization of railway container terminal and analyzes the advantages and feasibility of direct loading and unloading, followed by the function layout of the railway container terminal expounded, with the purpose of this paper analyzed separately on three operation processes. The key technology of the Internet of vehicles is briefly introduced. Finally, the overall process of this paper is depicted with five main steps in detail, which are acquiring vehicle networking data, platform development, algorithm implementation, MCU control and solid model display.

Particle Swarm Optimization (PSO) has excellent global exploration ability, but its local exploitation ability is not ideal. Wolf Pack Search (WPS), which is abstracted from the intelligent predatory behavior of the wolf pack, is an excellent local exploitation strategy and can be used to replace or improve the local exploitation capabilities of other heuristic algorithms. In order to improve the local exploitation ability of Particle Swarm Optimization without affecting the global exploration ability, a hybrid improved algorithm, named as WPS-PSO, based on wolf pack search is proposed. Though the simulation of fixed-dimension and multi-dimensional benchmark functions, and compared with the simulation results of the basic particle swarm algorithm, θ-PSO and Quantum Particle Swarm Optimization (QPSO), the results of 50 times simulations show that wolf pack search can improve the local exploit ability of PSO, and can better solve the multi-dimensional optimization problem.

The appearance of containers has changed the traditional form of railway freight transportation, and has also boosted the development of railway container terminals greatly. Rail mounted gantry cranes are the core resource of railway container terminals with its loading-unloading mode directly affecting the operational efficiency of railway container terminals. Based on the problem of loading-unloading mode selection of rail mounted gantry cranes, this paper analyses and compares the mode of "container truck-storage yard-container train" and "container truck-container train". The results show that the latter one is more beneficial to improve the operational efficiency of rail mounted gantry cranes and reduce the waiting time of container trucks and container trains.

As an important node of container transportation, the handling efficiency of railway container terminals has a direct impact on the capacity and efficiency of transportation process. In this paper, orbital container gantry crane's scheduling optimization problem is studied. By research the operation characteristics of gantry crane, considering various constraints, and aiming at the shortest total handling time, an optimization model of synchronous handling operation scheduling is established for improve the efficiency of handling operation at the railway container terminals.

Rail mounted gantry cranes (RMGCs) are the key resources of railway container terminals. In this paper, in order to improve the operation efficiency of rail mounted gantry crane and reduce the waiting time of container trains and trucks, rail mounted gantry crane is taken as the research object, and the operation scheduling mode of rail mounted gantry crane is taken as the research point. Based on Flexsim, a 3D simulation platform is built to simulate different operation scheduling modes of rail mounted gantry crane in railway container central station. Next, assuming data and setting evaluation indexes, different loading-unloading modes are compared by simulation. Finally, the optimal mode is selected by analysing the data.

At present, with the support of national policies, China railway express have maintained the momentum of rapid development, but there are still problems such as the imbalance in the number of outbound and inbound trains, and the long detention time of railway port stations. First of all, this paper analyzes the current situation and transportation organization mode of China railway express, then an outbound and inbound integrated transportation organization model was established with taking into account many factors such as transshipping capacity, storage yard capacity, facility capacity etc., in order to minimize the total container-hour in railway port station.

In this paper, we establish a dynamic optimization model based on the information of container trucks collected by internet of vehicles (IOV). This research aims to realize the direct loading and unloading operation between the container trucks and the container trains to reduce waiting time of the container trucks. Finally, the frame we introduced can get an optimal job sequence and is helpful for the operation in railway container terminals.

The NaOH solution can activate the surface of soil particles and solidify each other at contact points to improve the mechanical strength of soil, therefor the alkali liquor reinforcement method has the advantages of simple construction, high reinforcement strength, good water stability and low cost, and is applicable to the reinforcement of cohesive soil foundation. For loess lacking calcium and magnesium ions, CaCl₂ solution should be added and can react with NaOH to form Ca(OH)₂ hydraulic cementing material which can significantly strengthen soil. The strength of soil strengthened by NaOH and CaCl₂ double solution reinforcement is 1/3∼1/2 higher than that of single liquid reinforcement. As the operating load increases, it is necessary to reinforce the subgrade of a special railway line of Jinan city under the condition of normal traffic. The upgrading double liquid method is used for reinforcement and good results are obtained.

Optimal control for design of fuzzy logic controller for by tuning traditional PID parameters-based control strategy was proposed to control the looper's height on continuous pickling titanium plates and strips with an instability and random noise process. The parameters relations between fuzzy controller and PID controller are deeply analyzed. Then the whole output of the fuzzy controller which consists of two sub-controllers, the PI controller and the PD controller is designed using parameters of PID controller tuned by Ziegler-Nichols method. The fuzzy controller is compared with traditional PID by simulation and real engineering application. The results indicate that the dynamic control performances of the looper's height are much better by using fuzzy control strategy. The fuzzy controller is not only the designed simplify, but also the strong effectiveness and feasibility.

This paper introduces the technological process, system composition and automatic control mode of the gas station of A steel plant. According to the control requirements, it establishes the overall control scheme of the gas station system based on PLC. Taking advantage of STEP 7 software, it develops conversion of analog input range, conversion of analog output range and temperature conversion, control loops, chain process and other important programs. Finally it designs the gas station Controlling system.

This paper proposed a novel plug-in electric vehicle charging-ordered based on time-sharing control algorithm, the algorithm under the condition of meet the demand of the electric car charging users, by charging stations operating income maximization as the goal, uses the monte carlo simulation method to simulate the user charge needs to transport characteristics of the electric car users conditional probability analysis, and then through the way of peak stagger, established the mathematical model in orderly electric vehicle charging stations. Research results show that the dynamic grid through time-sharing control and time-sharing electricity two kinds of incentive, orderly charging control method can significantly improve the economics of electric vehicle charging station distribution network, reduce the voltage stress of distribution network, and has high computational efficiency.

In this paper, based on the analysis of the principle of the ocean magnetic measurement and the underwater acoustic localization, a kind of ocean magnetic measurement method combined with acoustics is proposed. The ocean magnetic survey method overcomes the defect of the positioning of the marine magnetometer probe. Through a two exploration for a submarine pipeline, marine magnetic prospecting technology with improved and no improvement is adopted respectively. After comparison test, it can be seen that the exploration results of the ocean magnetic survey method combined with acoustics are about 33% better than that before the improvement. This method is more practical for the exploration of submarine pipelines.

This paper proposes a new optimization based on charging load and the conditions of line loss minimum as the objective function of the orderly intelligent charging control strategy, the charging control strategy using the Monte Carlo simulation method to simulate the user demand, permeability at the same time considering the electric car users in a variety of scenarios, from several aspects, such as load, power loss and voltage electric vehicle charging to the influence of the distribution network are analyzed. Based on this, puts forward a based on the optimal charging load and line loss minimum as the objective function of the intelligent orderly charging methods, this method can meet the demand of the electric car charge, according to the trend of short-term load, in each period of rechargeable power optimization, to achieve steady load, reduce the energy loss and improve the voltage quality goals.

This paper adopts High Efficiency Supersonic Plasma Spraying (HEPJet) to produce aluminum coating under the condition of large powder delivery. Based on the Box-Behnken-Design (BBD) design in Response Surface Method (RSM), the interaction of Ar flow, power and spraying distance with the deposition efficiency and microhardness of aluminum coating was analyzed, and the spraying parameters of aluminum coating prepared by supersonic plasma powder feeding were optimized. The coating performance was analyzed by means of electron microscopy (SEM) and X-ray diffraction (XRD). The results show that the established quadratic equation model is reliable and the influence of spraying distance coating on deposition efficiency and microhardness is greatest. The parameters of spraying with large powder delivery were as follows: argon 200 L/min, power 50 kW, spraying distance 40 mm, and powder delivery amount 150 g/min. Moreover, the aluminum coating prepared by HEPJet has poor density, large porosity and severe oxidation, which provides reference value for the subsequent research on the preparation of aluminum coating by HEPJet.

A system which information or data is not enough relatively is named poor grey system. In recent years, grey system theory has a wider range of applications.By introducing integral generation operation theory to industrial control modeling, grey state modeling, has been presented in this paper. Some properties of grey equation of state has been studied in this paper.The grey state modeling maybe perfect modeling toolbox.

In this paper, studies the problem of rolling out of flight in air flight that may be out of control. First, the corresponding mathematical model is established through dynamic analysis. Secondly, the mathematical model is studied by using Lyapunov function method. Finally, the stability of the model is demonstrated in theory. The effectiveness and safety of the controller are designed.

Aiming at the human body exoskeleton motion intention recognition process, based on the pressure signals of muscle groups of control, building joint motion information acquisition system, the application of multi-sensor information fusion technique based on neural network, based on the piezoelectric signal muscle as input and output of the joint angle trajectory motion intention model, calculate the joint exercise intention and angle track. Finally, the knee flexion and extension movement as the main object of study, through calculation and practical test, the ideal results are obtained. It shows that the motion signals of the knee joint can be reflected by the piezoelectric signals collected during the motion of the knee joint.

Of escalators and moving sidewalks manipulation reversal protection device, the regular inspection and test is a standard, safety technical norms and requirements, is the important way to verify its validity function. Barring method applied in the field of frequency conversion of escalators and moving sidewalks reversal protection device for validation test, need to interrupt the motor running, because some automatic frequency conversion electric control system of escalators and moving sidewalks and protection function of frequency converter, cause in the process of test control system will automatically stop the escalator running, thus make barring method test cannot continue. Based on the analysis of frequency conversion control principle, design of ac electronic load circuit, to replace the inverter output load motor way, without changing and adjusting the original escalator and frequency converter control system, under the condition of on-site test is an effective method. Results show that using ac electronic load circuit, parts for frequency conversion escalators and moving sidewalks manipulation reversal protection device, technical measures for barring method test is feasible and solves the part of detection frequency escalators and moving sidewalks than manipulation reversal protection device, in stop problems in application of barring method test.

With the rise of the concept of "smart earth", the new generation of information technology has changed the way information interacts. The combination of things, intelligence and interconnection has made people's daily life more convenient. However, while enjoying convenience, information security has become a bottleneck restricting comprehensive interconnection. A variety of devices can be remotely controlled through public networks and sensor networks, but a large number of facts show that in an open network environment, information is easily stolen and tampered, and the resulting security problems are becoming more serious. The 4G (the 4 Generation mobile communication technology) remote security control system implemented in this paper consists of a main controller, a cloud server and an Android client. The information of the main controller and the client is encrypted by the national secret algorithms SM2 and SM4, the information exchange is performed by the cloud server, and the main controller establishes a connection with the terminal device through the short-range wireless network. Compared with the remote control system that usually uses international algorithms, this system has advantages in terms of ensuring the security and control on the basis of satisfying convenience and intelligence.

Mechanical vibration plays an important role in three phase wound rotor asynchronous motor. The PLC control system has played an important role. In this paper, we study the stability of a class of nonlinear mechanical control systems. By using the Lyapunov function method, the asymptotic stability of the zero solution of the system is obtained.

The motor model and control system is built based on vector control considering the iron loss, and the magnetic chain and torque observation module are designed. The system is realized by Matlab software and can run steadily. The loss model, the golden split algorithm and the hybrid algorithm are used to control the motor system and the total energy consumptions of the motor are calculated. The influence of iron loss was analyzed. The simulation results show that the energy saving operation of speed adjustment motor can be realized and enter steady state in a short time by the combination algorithm and vector control. The effect of energy saving is evident under light load.

This paper studies the issue of modeling and control of large unit coordinated control systems. The system is regarded as a three-input and three-output control object. Based on this, the system model is decoupled and the controller is designed. The controller is designed using an intelligent PID method, which based on genetic algorithm and fuzzy control model. The proposed method can optimize the control effect while ensuring the basic requirements, in order to achieve the goal of improving the dynamic process quality and improving the combustion efficiency.

The problem of power stations optimal operation based on cascade as a whole is rather complicated. In this article, minimal total power loss is taken as the objective in the optimal operation modeling of Cascade Reservoirs. Annealing genetic algorithm is adopted for a solution and the Cascade Reservoirs is taken as an example for calculation. Results show that the model could effectively improve the utilization of clean power from cascade reservoirs, providing a new thinking for optimal operation.

With the lack of support for new energy electric vehicles (EV) and the continuous introduction of new policies, EV are entering a period of rapid development. However, the large number of unordered access distribution network of EV users in the period will have a great impact on the power distribution network. EV will further aggravate the load peak valley of the grid during peak periods. It may lead to a series of problems such as overload of distribution network line, voltage drop, increase of distribution network loss and overload of distribution transformer. This paper makes an in-depth analysis of the influence of unordered access charging on power distribution network from theoretical and practical perspectives. For example, Network load, voltage, line loss, etc. Based on the analysis results, a smart charging station based on variable distribution is proposed. It is the best solution to solve the current problem by intelligent orderly control method.

A reservoir water level automatic monitor was developed. The water level gauge adopts a new type of two-dimensional code identification, the monitor housing is a new type of mechanical structure. The image acquisition part is mainly composed of STM32F407ZET6, OV5640 camera and LCD display. This part is responsible for image acquisition of the new two-dimensional code identification. The acquired image is image processed to obtain the desired image by the Otsu algorithm, and then the image is recognized. The monitor is powered by the solar panel. In addition, the monitor also includes an SD card, a raindrop sensor module, and a GPRS module. The monitor can effectively monitor the water level of the reservoir, and has high reliability and high measurement accuracy.

With the development of modern science and technology, the application of electrical discharge machining (EDM) has becomes more and more widespread. In this paper, GAMBIT software was used to establish the three-dimensional model of the deep hole machining process. On the basis of theoretical analysis of the gap of flow field working liquid, FLUENT software was used to simulate the bubble motion process for the multiple pulse discharge process. In addition, ultrasonic was imported into the EDM process, the bubble motion process was simulated and compared with the conditional process. The result presented was that the ultrasonic assisted machining process produced more bubbles, and the machining efficiency was improved.

Synchronized optimization of last trains' timetables is purposed to improve the connecting effects of last trains by coordinating the arrival and departure times of trains at transfer stations. Due to the great complexities of transfer relationships, it is more and more difficult to solve this problem. In this paper, in order to reduce the number of unable transfer passengers, an optimization model of last trains' timetables is proposed by determining the departure time and extra dwell time. And we minimize the difference between last trains' actual departure time and the optimized ones for the convenience of rolling stocks daily maintenance. Possible optimized solution is investigated through a case study in Beijing subway by using the tool of CPLEX. The results indicate that the volume of unable transfer passengers is reduced by 15.0%, and the number of coordinated trains is improved by 8.9%.

This article proposes a multi-resolution wavelet peak detection method for R wave localization to realize dynamic ECG diagnosis including RR interval, heart rate counting, bradycardia and bradycardia. Detection of R wave involves lots of cardiovascular diseases diagnosis, and plays an important role in ECG signal detection. Wavelet transform can describe the time-frequency characteristics of signals, allowing different resolutions to represent the time characteristics of signals; therefore, it is an appropriate tool for analyzing ECG signals. This method has been verified by MIT-BIH database's R-wave records. The sensitivity of R wave method is 99.92%, and the positive predictive rate is 99.93%, and the dynamic ECG diagnostic system performs well.

A Back Propagation neural network (BPNN) flux linkage model was proposed based on the measured magnetization curve for 8/6 poles switched reluctance motor (SRM). A flux linkage measuring installation is set up by using a digital signal processor (DSP) and measuring the voltage of winding under different rotor positions and different current values, then obtained the value of the corresponding flux linkage and the rotor magnetization characteristics of different positions.The flux linkage has higher accuracy. The design has the actual reference value to the high performance speed control of SRM.

The synchronization among the central electrode ignition control system, high-speed schlieren imaging system and pressure data acquisition system inside a constant volume combustion chamber (CVCC) should be accurately controlled in the study of the laminar burning velocity of fuel by spherical expansion flame method in a CVCC. In this paper, the digital delay pulse generator and the high-speed data acquisition card are used to control the synchronization among the abovementioned three systems with the control error in 30 μs, and then the schlieren image of the flame front and the pressure inside a CVCC are captured successfully. These lay a solid foundation for the measurement of laminar burning velocity by constant pressure method (CPM) and constant volume method (CVM).

Sorting problem has been one of classical combinatorial optimization problems, which has been widely applied in production and manufacturing fields in recent decades. This paper studies scheduling problem with time window constraint which can be regarded as a new resource constraint model which has potential applications in flexible manufacturing systems and printed circuit board components. However, in order to discuss integrality, this paper introduces scheduling problem of single machine with time window. SPWS and 3/2 approximation algorithms are designed respectively.

To solve the problem of long period in the process of new technology verification, this paper studied the new cylinder head process verification of triethylamine cold box core-making. Through using non-mold casting technique, the cylinder head verification process has been verified quickly. The results showed that, compared with the traditional method of verification, some effects have been found in the application of non-mold casting technique. Period was reduced by more than 45%, cost was reduced by more than 90%, and the risk of mold obsolete, due to process modifications, was eliminated.

VBV (variable bleed valve) is an important mechanism used by civil aviation turbo-fan engine to control compressor airflow, thus to prevent engine surge. However, since most of civil aviation turbo-fan engine are produced by a handful of manufacturers, the component characteristics and control principles of engine valves are not known. As a result, condition monitoring and fault diagnosis of VBV cannot be done by airlines themselves without the help of manufactures. Adopting MATLAB simulation software, using the quick access recorder (QAR) data, by function mining, this paper found a fitting function expression of the operation curve of VBV. The results of validation shows that, this function expression has high relevance and small error which can meet the needs of airlines for VBV condition monitoring and fault diagnosis; using MATLAB software for operation curve fitting of valves is simple and efficient, and it can be further applied in aero engine modeling.

In order to improve the efficiency of concrete curing and reduce the generation of cracks, a set of concrete spraying curing device is designed and developed by using computer control technology. The device can monitor the temperature and humidity of concrete in real-time and automatically control the spraying time according to the fuzzy control theory, so as to realize the intelligent curing of concrete. In the application of concrete curing on the side wall of Hanwangling station of Changsha metro line 4, it is verified that the maintenance system has obvious effects of spraying and moisturizing, reducing the generation of cracks and ensuring the construction quality of concrete.

The production mode of hand-sewn for complex shape multi-layer thermal insulation (MLI) of satellite has seriously affected its production efficiency and quality. Automatic sewing technology is an important means to improve MLI production efficiency. First, the problem of automatic creation of sewing patterns and paths needs to be solved, but there is no targeted research on MLI with special sewing requirements. In this paper, the principles of the sewing path are determined by combing the boundary conditions. Based on the chain code histogram and its spatial distribution entropy, the internal opening of MLI can be quickly identified to determine the nodes through which the sewing path passes. Then, the simulated annealing algorithm which can quickly converge to the global optimal solution is used to solve the NP-hard problem and realize the generation of the sewing path. For the special sewing requirements, the Laguerre diagram-based A-Star algorithm is used to realize the avoidance sewing path to the internal opening, and the MLI contour reinforcement sewing path planning is abstracted into the inward quantitative offset line generation problem of the contour. So the problem of automatic generation for sewing path of complex shape MLI can be solved.

The concrete structure, when being eroded, suffers premature destruction due to poor durability. This is primarily attributed to overlooking the impact that the shape and diffusion of dimension exert on the chlorine ion diffusion while designing the durability of the concrete structure. The method that is used for calculation of the durability of circular section members under chlorine ion erosion was proposed herein with the service life ending when chloride concentration on the surface of rebar reaches the critical concentration of chloride concentration. Furthermore, efforts were made through giving examples in analysis of the distribution rule of chlorine ion contained in the circular section members when attacked by traditional single-dimension and two-dimension chlorine ions as well as the service life of concrete members with different sections. The examples demonstrate that if circular section members were adopted to design the durability of the concrete structure in resisting chlorine ion erosion, the durability the concrete mix-ratio scheme requires would be extended and achieved, beneficial to making it less difficult to prepare concrete and cutting construction cost. Therefore, it concludes the circular section member is more durable than rectangular section member.

In this paper, the calculation and optimization of pressure set-points for large scale ultra-(super-) critical unit coordinated control system are studied, which adopts a multi-objective optimization method based on particle swarm optimization to adjust the pre-machine pressure set-point for the different external load requirements.

In order to accurately identify the stator and rotor faults of three-phase squirrel cage induction motor, it is necessary to extract the fault characteristics of the motor accurately and quickly. A normal induction motor, the stator phase current only have the fundamental component in theory, but it will produce harmonic components of different frequencies or change the energy of the original harmonic components when a fault occurs. Convert the fault current to frequency domain and get its spectrum, will be found that the amplitude of fundamental current is very large and the amplitude of harmonic current is very small, and their frequency is very close when the rotor bar is broken. Because of the influence of fundamental current, it is difficult to identify the fault feature components in the spectrum. In this paper use a hybrid genetic algorithm based on Nelder-Mead simplex method to estimate the fundamental current, obtain the expression of fundamental wave current and remove it from the fault current. In this way, the fault characteristics of motor stator or rotor can be obtained.

To make full use of the special structure of a type of block-structured systems, an automatic division method is proposed. By setting up a definite criterion for division, a block-structured system can be automatically divided into linear subsystems with an initial threshold value and a step-sized. Thus, dependence on previous knowledge and repeatedly tuning of threshold value are largely reduced. Finally, a multi-model controller is designed based on the linear subsystems for the considered block-structured system. A Lab-tank system that can be approximated by a block-structured model is studied, and simulations show that the proposed method is effective and useful.

For decades, two issues, hard-to-improved machined surface roughness and low machining rate, have hindered the further developments of electrical discharge machining (EDM) Tool in precision manufacturing. In precision EDM, keeping a large gap distance is the only way for conventional EDM to obtain the integrity of a machined surface. However, the fact is large gap distances really prevented further improving machined surface quality and meanwhile lowered machining rate as well. Conversely, this paper tried to take small gap distances so that a discharging mechanism of generating multi-discharging channels from one pulse could be realized. The consequences were that both much greater improved machined surfaces and fast machining rates were obtained in addition to the more integrated machined surface than the conventional EDM did. To this end, a novel EDM adaptive control system was studied in this paper where arcing ratio was a control indicator and gap voltage was a control parameter. By presetting an arcing ratio expected value, arcing ratio can follow the value all the time by adapting gap voltage so that arcing pulses could not take place in the gap and thus the integrity of the machined surface can be obtained. By properly setting arcing ratio expected value, gap voltages could be adapted low enough with respect to arcing ratios so that multi-discharging channels from one pulse could be formed. Comparison experiments not only proved the effectiveness of the EDM adaptive control system but also demonstrated the feasibility of forming multi-discharging channels from one pulse in precision machining. Compared with conventional EDM, in addition to the more integrated machined surface had been obtained the surface roughness had been lowered almost 4 times and the machining rate improved 2.7 times. The significance of the study is that forming multi-discharging channels from one pulse displayed an innovative approach in precision EDM.

Jiangmen Binjiang Sports Center, is the representative of the sports buildings in the sub-tropical area of China. The research is exploring a low-carbon climate adaptive design strategy for sports buildings in the sub-tropics through a case study on whether the design strategy of the Jiangmen Binjiang Sports Center fits in with the sub-tropical climate by means of computer simulation of wind, light and heat of the building.

Principle of electric vehicles composite power structure are analyzed and introduced, according to the characteristics of super capacitor and power battery to establish simulation model of vehicular composite power using fuzzy control theory to establish the composite power energy management system control strategy and bring new composite power supply model of electric vehicle driving cycle in different road conditions are simulated, the simulation results show that the control strategy of fuzzy control can significantly improve the working efficiency of the super capacitor and power battery, play the role of the super capacitor peak "cut", extend the service life of the battery; Under the same conditions, the vehicle's power performance and range are improved.

Compared with manual wheelchair, electric wheelchairs are more suitable for long-distance walking. But the price of electric wheelchair is high and it is inconvenient to carry. In this paper, a new type of external traction device of wheelchair based on STM32 chip was designed, which was versatile, light weight and easy to carry. The traction device was mainly composed of car body, electric wheel, drive control system, electronic intelligent steering system, speed control system, pre-crash safety system and etc. It had a variety of functions and was easy to operate, providing excellent solutions for wheelchair users.

With the increasing improvement of intellectualization and automation, the advantages of applying the automation in the field of robotics are becoming outstanding. The robot is taking the place of labor, which greatly improves the production efficiency of enterprises. Taking the motor case processing production line as an example, this paper did research on groupware application of industrial robot technology, PLC technology, CC-LINK bus communication technology and CNC machine tool processing technology, designed the robot's automatic loading and unloading device of the processing system and the automatic grading system for the finished product, which makes the robot and CNC machining become one and gains automatic and unmanned machining process of parts.

This brief focuses on the problem of trajectory tracking control of omnidirectional mobile robot with unknown external disturbances. It is assumed that the derivative of the external disturbances is bounded. The control scheme is divided into two parts. In the first part, the external disturbances are estimated by the disturbance observer. Furthermore, the feasibility of the disturbance observer is demonstrated. In the second part, we propose the trajectory tracking controller. Based up on Lyapunov function, the stability of the closed-loop system is analysed. Finally, simulations are given to show the validity of the results.

During the development of intelligent drive,the pursue for real-time and precise process of image has been the key point of research. This article introduces a simple way to identify the direction of arrows by means of their length and width.This method has been proven by Matlab.The Terasic's DE1-SoC development board and D5M camera are used to realize the algorithm. The result shows that this method has high performance on both timeliness and robustness.

This study successfully used the concept of molecular dynamics to explore multi-walled carbon nanotubes (MWNTs) with amine functional groups and subsequently applied these to macromolecular materials to construct a novel MWCNT-reinforced macromolecular composite. Nanoscale tensile simulations were performed to examine the reinforcing phenomena of the nanocomposite composed of functional group-based MWNTs and subsequently explore the reinforcement mechanisms involved. The reinforcement mechanism of a nanocomposite made only of MWNTs and macromolecular materials stems from the interfacial energy between the MWNTs and macromolecular material. The interfacial energy is supplied by the Van der Waals force between the MWNTs and macromolecules and is considered a physical bond. By contrast, the interfacial energy between the novel macromolecular composite with amine functional groups was supplied by the chemical bond between the functional groups on the surface of the MWNTs and macromolecular materials. The interfacial binding force of a chemical bond is stronger than that of a physical bond. Therefore, a nanocomposite composed of functional group-based MWNTs can provide greater strength.

This study constructed an ultrasound-assisted AFM nanomachining platform by integrating an atomic force microscope (AFM) with a quartz crystal microbalance, which was subsequently used in experiments for determining the microscopic phenomena of ultrasound-assisted nanomachining. Force-distance curve measurement was used to establish a normal force measurement model, obtaining the downforce strengths during ultrasound-assisted nanomachining. Subsequently, machining experiments were conducted on monocrystalline silicon to explore the effects of various experimental parameters (e.g., machining speed and normal force) on machining depth. The experiments showed that the ultrasound-assisted AFM nanomachining platform constructed in this study is effective. After ultrasound was incorporated, monocrystalline silicon specimens made of brittle material could be more effectively processed under various experimental parameters. Moreover, the performance of ultrasound-assisted nanomachining was superior to that of general nanomachining.

This study presents based on the constant Reynolds average Navier-Stokes equation, the surface wind pressure and surrounding wind field of the dome structure under different winds are numerically simulated by finite element software. The RNG turbulence model is used to calculate the flow coefficients around the building and the pressure coefficient distribution around the roof at 7 wind direction angles from 0° to 90°, and analyze the basic characteristics. In addition, the six aerodynamic components of each wind are calculated, and their variation with the wind direction angle is pointed out. Moreover, The maximum negative pressure at the top of different winds is predicted and compared with the wind tunnel test data of the structure. Those result agree well.

Aiming at the problem of vehicle positioning orientation technology in actual combat background, this paper studies the autonomous positioning system of SINS/LDV/OD, and designs the LDV/SINS and OD/SINS subfilters of the union kalman filter and the main filter of the autonomous positioning system. Based on the characteristics of the fault of the subfilter, the fault tolerant scheme of the autonomous positioning system was designed, and the 50Km roadster test was finally carried out. The longitude error is not more than 20m, the latitude is less than 20m, and the height error is not over 10 meters. The experimental results show that the design scheme is effective and can meet the actual operational requirements.

In this paper, strategy of hybrid control for a dynamical love system is taken into account. Hybrid controller is used to control the behaviour of love systems for the first time. By choosing suitable bifurcation parameter, it can be found that the Hopf bifurcation occurs when bifurcation parameter passes through a critical value. Stability analysis shows that by setting proper values of hybrid controller, the appearance of bifurcation will be delayed or advanced, and some interesting behaviors can be achieved. The stability of the bifurcating cycle for love dynamics are also derived. Finally, numerical simulation illustrate this control strategy is useful in controlling the appearance of Hopf bifurcation which has taken place in love model.

Different drivers produce different characteristics of driving data, for different requirements of the vehicle reliability, safety and comfort, the driving style is analyzed according to the driving data collected by the vehicle. This paper presents and designs a platform of vehicle operation data real-time acquisition based on UDS diagnosis. The platform uses MCU and CAN controller to build communication modules, and with PC to control data collection, display and preservation. The overall design process is systematically elaborated in this paper, including the design method of vehicle embedded data acquisition terminal and PC monitoring terminal, focusing on the design of platform communication protocol. The test results show that the platform satisfies general vehicle data acquisition requirements.

Nowadays, we are not allowed to speak loudly and sing loudly in outdoor environment and our environment. Based on this, the design of muffler masks is proposed. This design adds a circuit which transmits the electric signals generated by microphones to the earphone on the normal headphones to realize the ear return function. After that, different materials are studied through experiments. The change of penetration rate and respiratory resistance of masks with different structures and layers under different flow rates; and the change of singing voice under different layers was detected by noise analyzer, and the optimum layers of sound-proof cotton were finally determined, so as to achieve the effect of silencing.

Firstly, Interaction between soil and pile which is caused by pit opening is analysed through FLAC^3D, the flexural moment and earth pressure of pile can be extracted through the program. Secondly, through the analysis of the soil pressure on the pile side, a simplified algorithm that engineers can simply estimate the flexural moment is obtained. Finally, the earth pressure is obtained by geotechnical centrifuge experiment and then the flexural moment is recalculated through this algorithm, the two results are basically consistent, the feasibility of the method is verified.

Soil liquefaction is a major cause of site damage to an earth dam in the earthquake and geotechnical engineering. Wangqingtuo Reservoir is an integral part of China's South-North Water Transfer Project in Tianjin. Due to the weak geological engineering conditions of the reservoir area and the location belonging to regions with basic earthquake intensity of degree 7, there is a slight possibility of liquefaction of the dam foundation, when the reservoir is impounded. Therefore, liquefaction control measures need to be implemented. Mainly by improving soil properties and initial stress of the liquefiable soil, four liquefaction control measures were put forward; surface excavation and backfilling, setting pressure platforms, anti-seepage platform and strengthened drainage design. Based on high-density surface wave exploration, field tests, laboratory tests, liquefaction identification, and liquefaction classifications; influence factors of silt liquefaction are determined with results analyzed before and after liquefaction control measures of the dam structure. A dynamic numerical modeling analysis was used to evaluate the extent of the liquefaction control measures, with the aid of Geo-slope software.

The stability of deposit slopes against sliding is studied using the limit equilibrium methods in this paper. As a case study, all the results are shown based on deposit slope in front of the dam of A'hai Hydropower Station, China. A calculating strategy to improve the convergence of rigorous Janbu method is proposed using cubic B-spline interpolation smoothing processes of inter-slice moment distribution. The factor of safety calculated by the modified rigorous Janbu method in this paper is consistent with those obtained by other limit equilibrium methods. It has been shown that the deposit slope in front of the dam is stable under natural conditions. The factor of safety of deposit slope stability against sliding is between 0.865 and 1.167 under normal water level conditions, which indicates that local instability of deposit exists. The factor of safety is sensitive to internal friction angle of alluvium under the water-saturated state. Some treatment measures are briefly discussed to improve the stability of the deposit in front of the dam.

On the basis of the overall structure design and aerodynamic calculation of the annular low-speed wind tunnel, this paper uses the CFD numerical simulation technique to study the influence of the contraction curve form, the contraction ratio and the open/closed loop form of the test section on the flow field quality of the wind tunnel test section, and then gives the three-dimensional geometric model and the numerical simulation results. It is found that the best flow field quality can be obtained by using the bicubic curve, the contraction ratio of 10.24 and the closed loop form of the test section under the same fan condition. The three-dimensional modeling method is adopted in this paper, which can obtain more accurate numerical simulation result than the two-dimensional modeling method. Thus, the numerical simulation result provides a solid theoretical basis for the design and construction of the actual low-speed wind tunnel.

Kinetics of 2,3-DCB dechlorination by Pd/Fe-MWCNTs-Fe₃O₄ composite nanoparticles synthesized under ultrasonic irradiation was investigated. The diameters and specific surface areas of most Pd/Fe-MWCNTs-Fe₃O₄ nanoparticles that prepared by liquid phase reduction method under 40 kHz and 150 W ultrasonic irradiation were obviously modified. The optimized experimental conditions were obtained and up to 95% of 2.3-DCB was removed in 300 min with mass fraction of Pd in Pd/Fe-MWCNTs-Fe₃O₄ nanoparticles 0.35%, initial pH value 3.0, initial 2,3-DCB concentration 10 mgL⁻¹, reaction temperature 25 °C, Pd/Fe nanoparticles 5.0 gl"¹, Fe₃O₄ nanoparticles 2.0 g L⁻¹, and MWCNTs dosage 0.25 g L⁻¹. The dechlorination of 2,3-DCB followed pseudo-first-order kinetics reaction and the kinetics constants k₁and k₂ were 0.025 min⁻¹ and 0.105 min⁻¹, respectively.

This study applied electrochemical atomic force microscopy in a liquid environment. Copper was used to conduct an experiment involving nanoscale electrochemically assisted machining. Experimental conditions (e.g., number of scans, bias voltage, and electrolyte formula) were adjusted to explore the resulting phenomena and effects on nanoscale electrochemically assisted machining. The experiments showed that increasing downforce in air did not significantly influence the Cu specimen. In 0.01M phosphoric acid, applying a small amount of downforce and bias voltage resulted in a significant machining outcome. Optimal machining efficiency was achieved in the presence of both 0.01M H3PO4 and bias voltage of 0.5 V. Moreover, after machining, a small amount of oxide was scraped off the Cu surface and adhered to the probe.

This study describes a way to realistically model the internal erosion after of damage in the concrete face of a concrete face rockfill dam (CFRD). The study uses a 2D plane strain model of Tianshengqiao dam's geometry as an example, with and without consideration to erosion of the underlying cushion and transition layers. In order to accomplish this, Mazars' concrete damage model, which is a continuum damage model, was coupled with permeability relationships on the face slab; and poroelastic model was used in conjunction with Sterpi's erosion model for the underlying cushion and transition layers. Two scenarios were studied: without considering erosion and considering erosion. Results reveal that when the reservoir is linearly impounded damage in the face slab is concentrated to the lower quarter of the slab, and internal erosion will occur at the toe of the dam. After more fine particles are lost, the mechanical and hydraulic properties of the dam will change and the dam safety can be compromised.

In order to realize the real-time remote monitoring and accurate management of the paddy field environment, the intelligent water-saving irrigation system based on the agricultural Internet of things was designed. The data packet consists of water level, soil moisture, soil fertilizer, crop height, real scene photos and so on, which are collected by the terminal monitoring equipment group, and is forwarded to the gateway through the main controller. The gateway transmits the processed data packets to the cloud server through GPRS, and then sends to the user app or the Internet web page. App and the internet can set the upper and lower threshold of the terminal node water level. According to the comparison results between the water level and the threshold set by the water level sensor, the node solenoid valve is controlled to open or close the gate of the rice field intake, and the automatic irrigation is realized. The system can set a fixed number for each monitoring node to find fault units quickly and enhance system reliability. The system gets the advantages of simple implementation, low power consumption, perfect function, and high reliability.

The mechanism of low speed pre-ignition (LSPI) and knock process in boosted direct injection spark ignition (DISI) gasoline engines are researched in this study. A single cylinder boosted DISI engine test bench was set up and operated at LSPI caused by oil, whose results are used to verify the feasibility of the calculation models. The geometric model is therefore established and the numerical simulation working at different injection times when the engine speed at 1200rpm and 1600rpm are conducted with the AVL FIRE CFD software.

In order to predict and control the ground settlement caused by the overlapping construction of the upper and lower lines of the shield tunnel in Foshan area effectively, this paper takes the overlapping section of the left and right lines of the Ludao Lake-Liantang segment of Foshan Metro Line 2 as the main research object, simulate the construction process of overlapping sections by finite element software and combined with field measured data, predict the ground settlement caused by the overlap section construction effectively, so as to take targeted control measures and verify the reliability of the formation reinforcement measures. The results show that reasonable reinforcement measures can be taken to effectively control the ground settlement before the construction of the overlapping section.

Based on a 20-layer rigid frame structure, a viscous damper is selected. First determine an amount of viscous dampers. Assign the determined damping amount in different ways, Then different seismic responses are obtained under different seismic waves. Compare interlayer displacement and velocity under various operating conditions, and find a distribution scheme with better shock absorption.

The influence of the frequency modulation on the nonclassicality is explored in a system of nanomechanical resonator, which is a promising device in the fields of quantum information engineering. It is shown that the nonclassicality of the quantum state is dependent on the value of the modulation rate during the quantum evolution. A pronounced peak is observed in the curve of the nonclassicality versus the modulation rate. It indicates that the system's nonclassicality can be enhanced by the modulation rate. The enhancement of the nonclassicality by the modulation rate is induced by the effects of the external driving source on the quantum interference between different energy levels. This is supported by the correspondences between the dependence curves of the nonclassicality indicator and the uncertainty of the Wigner distribution function on the modulation rate.

The contact parameters of materials have great influence on the results in structural dynamic analysis, but the friction relation between wires has not been solved, which often causes the simulation error. To improve the accuracy of the finite element simulation, this paper study the friction and load relationship between wires of galvanized steel strand, testing material friction coefficient and drawing load of single wire for different length, obtains the force-displacement curve of core wires. The results show the friction coefficient between wires of galvanized steel strand is from 0.42 to 0.52, the friction force and the length of the wires present a linear proportional relationship; The maximum static friction of core strands is independent of drawing velocity.

This paper presents a novel solution for defect detection and health monitoring of steel structure by involving effective use of Unmanned Aerial Vehicle (UAV) and Image Processing System. Lots of the traditional test work depends on manual labor despite that the inspection and testing environment is rather harsh. The conventional inspection method does not meet the requirements of high efficiency comprehensive security. The proposed system integrates six-axis UAV platform, image processing and big data analysis for detection and safety evaluation of steel structure's surface degradation. The visual sensor, ultrasonic sensor, laser sensor, and other complementary sensors are crossed integration for UAV platform in order to achieve stable and high-definition aerial photography, which can definitely enhance the reliability and stability of the UAV system and intelligent image processing algorithm has been applied to identify the defect and potential diseases of steel structure. Finally, the results show this approach is the cost-effective and time-compressing solution for health monitoring of steel structure.

The abrupt fracture of prestressed steel strand will form a great unloading impact force, which will influence the displacement and internal force of the remaining structure. Shock response spectrum method can reduce the computation and ensure the accuracy. In order to obtain the shock response spectrum of the steel strand at the moment of failure, this paper proposes to solve the dynamic response of a single degree of freedom structure after cable break through programming under the premise of knowing the failure time of the strand and the corresponding cable tensioning. We select several unloading curves that are the closest to the test, and solve the response spectrum of the broken cable under different failure time and damping, finally, the response spectrum method is compared with the finite element method by numerical simulation. It can be found that the dynamic coefficient will show different trends due to the change of unloading methods. In the same unloading method, the failure time has little impact on the shock response spectrum, but the impact of damping on the shock response spectrum is very obvious.

In the application of magnetic signal measurement such as non-invasive temperature of ferromagnetic resonance, magnetic nanoparticle fluid hyperthermia, magnetic nanoparticle concentration imaging, etc., it is necessary to generate a free static magnetic field point(FFP), so as to the signal is extracted and the corresponding magnetic signal is obtained by calculation. FFP is the point at which the static magnetic field produces a magnetic field strength that is approximately zero. FFP is established by a set of coils that generate static magnetic field with different circular currents. Based on Biot-Savar's law, using the geometric relationship of the coils, an analytical method is proposed for calculating the current of each coil when an arbitrary point on the XOY plane as FFP. The analytical method not only overcomes the shortcomings of the traditional iterative method, such as slow convergence and uncertain results, but also has a theoretical basis, fast calculation speed and high precision. The simulation results show that the position error of FFP is within 3 mm, a gradient magnetic field is formed around the point, which satisfies the needs of magnetic signal measurement in the above applications. This is helpful for the improvement of the application of magnetic signal measurement.

VM (Virtual Machining) is a digital model of actual processing in which the actual processing process is abstracted, analyzed and synthesized. It is the mapping of actual processing in the virtual environment of the computer. Virtual machining technology helps teachers to teach and enables students to understand the content of teaching more easily. This paper will introduce the processing technology of engine crankshaft and how to make dynamic simulation of the machining process of engine crankshaft by using virtual machining technology software Unity3d, 3DSMAX and cartographic software Solidworks.

In this paper, the damping effect of the metal damper as the parameters are changed is studied by adding a metal damper to the single-particle model . The influence of metal damper parameters on the damping effect is studied by changing the lateral stiffness k_d, yield displacement u_dy and yield strength F_d of the metal damper. Using a time history analysis program written by the fortran language to calculate the structural seismic response values as the parameters are changed. Calculate the response values of displacement, velocity, acceleration and energy consumption, plot the curves and analyze them. Research shows that the lateral stiffness k_d, yield displacement u_dy and yield strength F_d of the metal damper have significant effects on the damping effect of the metal damper. The study gives the optimum multiplier of the ratio of the lateral stiffness under multiple earthquakes, and the optimal multiple of the ratio of the yield displacement are also given. The results of the research provide reference for the design of the energy dissipation and seismic systems.

Research on dynamic path planning for autonomous vehicle has been increased significantly in recent years because of the percentage of car accidents reduced by autonomous driving. The functions of Artificial Potential Fields (APF) as mentioned in previous studies, particularly nonlinear constraint, speed and safe distance, are seldom discussed or mentioned. In this paper, we focus on the need for vehicle safety. Thus, this study proposes a fuzzy artificial potential field path planning algorithm (FZ-APF) for local path planning in vehicle. FZ-APF introduces the distance factor to solve the well-known drawbacks of the traditional APF like goal non-reachable with obstacle nearby (GNRON) problem. However, FZ-APF not only optimizes path but also deals with the constraints of vehicle like the limit of steering angle at different speeds. Therefore, FZ-APF introduces longitudinal potential function to make the planned path accord with vehicle characteristics. In addition, to achieve more safe and efficient FZ-APF for vehicle, the fuzzy technique which adjusts the parameters at any moment according to the current speed and safety distance of the vehicle is added into FZ-APF. Numerical simulations are presented and validate the proposed algorithm under some complicated test scenarios. Experiment eventually illustrates the efficiency of this FZ-APF algorithm using an autonomous vehicle prototype.

Based on the non-equilibrium Green's function in combination with the density-functional theory, we investigate the spin-dependent electronic transport of graphene nanoribbon partially linked to two single Au atomic chains leads with symmetry and asymmetry structures. For symmetry structures, the spin-dependent electronic transports are spin degeneracy, but for asymmetry structures, the spin degeneracy will be broken, leading to high spin polarization. So the spin-polarized transport can be controlled simply by adjusting connection structure between leads and graphene nanoribbon ends. Deeper analyses indict that the spin-dependent transport behaviours can be interpreted by the magnetic moments and the local density of state (LDOS).

In this research paper, a test device that measures the leakage dissolution characteristic of diaphragm wall is introduced. The article mainly describes the thought of development, the basic principle, the structure, and the test result of the device that shows the test device is reliable using the testing examples of measuring the leakage dissolution characteristic of diaphragm wall.

This paper studies the control of super Gaussian random vibration test. Experiments show that based on the proposed super Gaussian random vibration control strategy, the output power spectrum and kurtosis can be highly accurate and meet the requirements. The super Gaussian random vibration control system can significantly accelerate the fatigue failure process of the fan, improve the test efficiency, reduce the cost, and shorten the product development cycle.

With the rapid development of China's society and the implementation of the Belt and Road policy in recent years, many large-scale complex steel structure bridges are constructed, typically represented by the Hangzhou Bay Sea-Crossing Bridge and the Hong Kong-Zhuhai-Macao Bridge. In this paper, the checking calculation for the overall force of the steel box girder during construction is studied. The analysis shows that the steel box girder concerned has good stiffness and ductility.

Based on the overall basic parameters and design requirements of FSAE racing car, a method for optimizing the design of FSAE racing steering system was proposed. Firstly, the mathematical model of the steering trapezium of the steering system was established, and the plane steering trapezoidal parameters were optimized by MATLAB programming. Then the virtual prototype model of steering, forking arm and front suspension was established by using ADMAS dynamic simulation analysis software. The relation schema of the inner wheel and outer wheel rotation angle, the parallel wheel travel and the varying parameters of the up-and-down travel were analyzed to ensure the stability of the racing car in the steering process and reduce the wear of the tire. The results showed that the optimized steering trapezoidal mechanism attained the expected goal and offered reference for the steering system design of FSAE racing car.

Aiming at how to quantitative the influence that equipment failure is affected by high temperature, firstly the paper qualitatively analysed the process that energy transfer in engine and cooling system. Then one energy transfer model is set up which is based on the theory of engine and cooling system working. Finally, according to the energy transfer model and engine working time restriction rule, the 'time-discrepancy' model and the 'time-proportion' model are put forward. These models can be used in quantifying the influence that equipment's main part working in high temperature environment.