Table of contents

Soybean fermentation is a key of production of soy sauce, and directly affects its quality. In order to solve the problem of slow convergence speed and low error precision in VLBP, a new model of optimized VLBP by quantum revolving door of quantum evolution algorithm has been proposed. The model and algorithm are performed the quantum-behaved data into input-layer of VLBP which is transformed by the principle of phase shift in the quantum behavior theory, and the weigh data is performed a controlled-NOT gate as the output-layer input to reform the forward transmission. With the steepest descent method, the information is transferred by the error back propagation perform updating the weighs in the hidden-layer and output-layer by involving the controlled-NOT gate's transfer function. Finally, the trained algorithm has been used for forecasting the soybean moisture content of soaking time and temperature using the R-QEABP and VLBP neural network algorithm. Compared with VLBP, the results have been indicated that the R-QEABP has great advantages of convergence speed, lower verify error, and better robustness for the purpose of realizing the accurate prediction of soybean moisture content in the process of soy sauce brewing production.

Electronic pressure regulator (EPR) is an important part of pressurized lean premixed CNG engine fuel supply system. To improve the precision of CNG engine Air-fuel ratio control, this paper build the physical and mathematical model of the gas state variation and the movable elements of two-stage typical regulator based on fluid mechanics and force analysis. The mathematical model is composed of differential equation of valve plate movement, gas-flow and intracavity continuity equation. The accuracy of simulation and simulation method was verified by comparing the simulation results with the experimental data. Pressure variations in decompression chamber affected by significant parameters of second-stage regulator were studied in detail, such as damping parameters, spring stiffness and mass of valve plate, etc. Combined with further experiments, it is proved that the mechanical structure can ensure the transient performance of the system.

From the manager and the traveler's point of view, a bi-level programming model of structure optimization considering multi factors is proposed for comprehensive transportation corridor with parallel structure. In the higher level model, land resource consumption, upper model energy consumption and environmental emissions as indicators are selected as indexes to minimize the social resource cost. In the lower level model, the Mode-Path User Equilibrium model is selected for traffic distribution. To minimize the total travel cost of travelers, the supply and demand balance coefficient is selected as the channel response function and a model solution algorithm is designed based on genetic algorithm. At last, the proposed model is applied to Zhejiang Province Hangzhou Ningbo transportation corridor. The channel traffic demand is calculated for the planning year and the reasonable channel structure optimization program is given, which proves that the model is scientific and effective.

Equipment manufacturing industry standard system became the basis intelligent manufacturing. In view of the current situation of the development of equipment manufacturing industry standard system, finding weak links for the existence, and solve practical problems although applies the method of information science and technology theory, and design Material&field model, and the method precision calibration, came up with the optimized solution feasible standard system innovation, and provides a new thought and method for the equipment manufacturing industry standard system construction.

fireworks explosion algorithm is a relatively new population intelligent evolution algorithm, having a good performance in local mining and global search for optimal solution while little weak in searching speed. Therefore, this study focus on researching how to use the fireworks explosion algorithm(FEA) to deal with hybrid flow shop scheduling and optimization problem effectively both in accuracy and speed. The main contribution of this study is to develop a new firework individual encoding and decoding methods which could help FEA to solve HFS problem easily and effectively. Several practical instances testing proved that the FEA algorithm has better performance in dealing with HFS problem than GA and CS algorithm.

Using fiber bragg grating(FBG) sensor to monitor the strain of connecting bar, which connects the Acrylic sphere and steel structure in central detector of a national scientific device. The stability and static parameters of FBG sensor had been tested before calibration. Experimental results show that Linearity Coefficient is above 0.9999, Linear Error is less than 0.75%, Repeatability and Hysteresis Errors are less than 0.50%, the maximum Synthetic Error is 0.90%. And the stability and durability can meet the engineering demand of strain monitoring for the central detector. The monitoring system can meet the long-term health monitoring requirements. The experiment testing accumulates construction experience for connecting bar stress detection.

In order to solve the scheduling problems of Re-entrant Hybrid Flowshop (RHFS), this paper investigates the mathematical programming model of RHFS, and proposes the wolf pack based algorithm (WPA) as a global optimization method. Multi-Sticking Crape Masking procedure scheduling problems in painting workshop of a bus manufacturing enterprise are of typical features of RHFS. We regard it as an application objective of the proposed algorithm, applying WPA and multiple evolutionary algorithms to solve the problems. The results show that the algorithm can solve re-entrant scheduling problems of hybrid flowshop more effectively compared with other conventional methods.

In order to reveal the impact of the rolling thermal coupling friction on the cold roll-beating during high speedcold roll-beating forming process, involute spline as the research object, established a high-speed cold roll-beating finite element model, the changes of elasto-plastic deformation and thermo-mechanical coupling stress during involute spline cold roll-beating contact are studied; and the distribution of temperature, stress and strain field under a single stroke; the stress, strain and temperature curves of the key elements are extracted, and the influence of temperature on the thermal coupling stress and strain is analyzed. The results show: in the process of cold roll-beating, the gradient distribution of strain field, temperature field and stress field in the area of severe deformation is very large, while the temperature, stress and strain of other small deformation areas are low; high strain and high temperature are mainly distributed in the direct contact with the rolling wheel surface area; the temperature generated during cold roll-beating reduces stress and increases the effectiveness of metal flow.

In order to improve the spline cold roll-beating surface roughness and surface quality, spline cold roll-beating test was taken according to cold roll-beating forming principle. The response surface method and gray prediction method were used to construct the prediction model of cold roll-beating surface roughness of spline and to verify the prediction model, compare and analyze two methods of constructing prediction model. The results shows: response surface method to build spline cold roll-beating surface roughness prediction model is simple and has a high prediction accuracy.

This Charpy impact toughness and microstructure evolution of simulated heat affected zone (HAZ) for E40 ship plate steel have been investigated in this experiment. Simulation of large heat input welding was conducted by thermal simulator to research microstructure evolution of HAZ at 1400°C peak temperature. Results show that microstructure at HAZ was mainly composed of high intensity of acicular ferrite (AF) and intragranular ferrite (IGF), and grain boundaries ferrite (GBF). Hardness of HAZ decreases with heat input (HI) increasing. Impact toughness for steel specimens with HI of 500 kJ/cm was 141 J. TiN precipitates nucleation and growth at HAZ was analyzed by TEM, indicating that TiN size increases and the number of TiN decreases at HAZ with HI increasing. The reason is that the specimens with HI of 400 kJ/cm has longer cooling time from 800°C to 500°C than 120 kJ/cm, which is favorable to growth of TiN particle at HAZ.

The "rapid manufacturing technology" solves the bottleneck problem of restricting R & D and trial production of industrial design as well as breaking the traditional mode of product design and development. When not open the mold, R & D personnel can achieve the production demands of small quantities and varieties of products. Using rapid manufacturing technology can obtain prototype almost exactly as the same as the quality of the actual product, which will help to put into mass production after the successful negotiation of transaction. At the same time, rapid manufacturing techniques facilitate the correction of possible design errors before opening the mold.

The deaerator control system with multiple actuators of main and vice valves was described. An improved control strategy was proposed in order to solve the problems occurred in this type control systems. Especially, the newly tacking loop was designed to satisfy no disturbance switching of the control system. Furthermore, the control algorithm expressed in this paper was confirmed by the rigorous verification of three hypotheses. Thus the no disturbance switching and system stability could be achieved by this control algorithm proposed in this paper. Finally, the control algorithm was applied in the deaerator level control system and condensation water head pressure control system. Fluctuation of the main/assistant regulating valve command was resolved thoroughly. The operation results indicate that the no disturbance switching and superior control performance are achieved after the application of the control algorithm.

The austenitic stainless steel cryogenic pressure vessels are mostly used for the extreme pressure equipment. Strain hardening austenitic stainless steel cryogenic pressure vessels will undergo the plastic deformation during forming and strengthening process. However, the excessive plastic deformation will cause the performance of vessels can not to meet the requirements of related manufacturing and testing standards. Determining the mechanical properties corresponding to the different strain intensities is very important for the safety evaluation of stain strengthened vessels. For normal temperature strain hardening technology, the influence of strain rate on strain hardening and ductility attenuation of austenitic stainless steel cryogenic vessels under normal temperature is studied in this paper, for being used to evaluate the quality and safety performance of the austenitic stainless steel pressure vessel.

The 2K-H planetary gear reducer is an important driving part in the climbing system of the stair-climbing wheelchair. Based on the conventional mechanical design parameters, the mathematical model of the reliability optimization of the planetary gear reducer is established by using the reliability theory and the computer optimization method. Seeking optimal design parameters by the optimization algorithm of Matlab software. On the basis of satisfying the reliability constraint, the purpose of reducing the volume of the reducer and increasing the transmission efficiency is realized. It provides a theoretical basis for further optimization of structural design.

This paper introduces a new type of energy saving device for tyre type container gantry crane (RTG for short), the main principle of reducing the energy consumption of the lifting process is for equipping the counterweight device and the wire rope winding device on cranes' steel structure. The main components of the energy saving device are introduced in detail in this paper, and the stress analysis and theoretical mechanics calculation are carried out. The calculation results imply no significant stress influence on the steel structure of the equipment for the reasonable design of the steel wire rope winding device and the rationally distribution. The crane's energy consumption decreased by 15% at the chosen port test after the installation of energy-saving devices, which has significant social and economic value.

As is known to all, a vehicle air brake system usually contains moisture. To help solve the problem, it is common to use air dryer to dry compressed air effectively and completely remove the moisture of braking system. However, the existing air dryer has many defects such as low drying efficiency, high cost, complex structure and difficult assembly. In order to solve these problems, our company began to study new Air Dryer, meanwhile, to improve the service life of air dryer.

With the continuous development of China's market economy, the demand for commercial vehicles is increasing, and the loading capacity of traditional tractors in the transportation sector cannot meet the demand. As the problem of carrying capacity has been solved by the advent of trailers, the reliability and environmental protection of the products are more and more concerned and studied by the automobile developers. This study describes the structural design principle of the trailer brake control system and analyzes the key component – trailer braking valve through the connections and output line with hand brake valve and foot brake valve and the product performance and environmental protection.

Improvement of the environmental pressure of gas bearing can enhance the load capacity of dynamic gas bearing. This study analyzes the effect of environmental pressure on the dynamic characteristics of a bump foil gas aerodynamic bearing. Results show that an increase in the environmental pressure enhances the direct dynamic stiffness Kxx and Kyy and the direct dynamic damping Dxx and Dyy of gas film. The direct stiffness Kxx and Kyy and direct damping Dxx and Dyy of gas film increase with the increase of the environmental pressure of gas bearing. The load capacity of bearing is related to the direct stiffness of gas film. Therefore, the direct stiffness Kyy can be increased by increasing the environmental pressure of gas bearing, consequently improving the load capacity of the bearing.

At present, the clutch master cylinders used in most manual transmissions at home and abroad are constructed of cast iron or cast aluminum without electronic displacement sensing. This type of product is susceptible to problems such as rusting or uneven wear and poor vehicle handling performance. This study describes a plastic clutch master pump with displacement switch, which can light the structure under the same displacement and stroke and add displacement switch structure. It can provide injection data to ECU, prevent manually shifting car from stalling and improve vehicle operation performance. The part of the clutch hydraulic system, the light weight part of the clutch pump, the displacement switch part and so on are analyzed and discussed respectively.

China library classification number: ME4041

The leak-before-break (LBB) technology has been widely used in the design of welded pressure vessels and pipelines, and it is based on the theory that the penetration of fluid through cracks, which exist in the walls of the pipe and vessel, can be detected before the they reach a state of instability. In this paper, leak rates in different opening direction are calculated and analysed by finite element analysis software Fluent in the case of single phase fluid. It is concluded that there is no linear relationship between the leak rate and the CTOD value or the crack length, and that the influence of the CTOD increase on the leak rate is greater than that of the crack length.

Considering the global aging of pipelines and demand for new ones in more and more hostile environments, in-line inspection (ILI) based on the Non-Destructive Testing(NDT) was essential for pipeline operating company to protect their asset efficiently. This paper reviewed kinds of state of the art of ILI techniques and equipments, including geometry pig (GP), magnetic flux leakage pig (MFL PIG), ultrasonic pig (UT PIG), electromagnetic acoustic pig (EMAT PIG), eddy current pig (EC PIG), integrated function pig and specific function pig. Through the review of kinds of techniques, different approaches were compared, challenges and problems were highlighted and future research and direction was suggested.

The complete automatic ultrasonic testing (AUT) reliability theory and evaluation system were established for automatic welding joint of long distance pipeline. The reliability of AUT system was verified by several indexes, including Probability of Detection (POD), Probability of Sizing (POS), Probability of False Alarm (PFA), Probability of Rejection (POR) and Receiver Operating Characteristic (ROC). In order to evaluate AUT process and analysis reliability of AUT system, the sample size was optimized to 46 and the quantitative data of defects in AUT, RT and macroscopic metallographic section were analyzed statistically, which could directly provide reliable quantitative bases for the automatic welding quality acceptance of AUT Technology. The results show that POD and reliability of AUT are not less than RT, which can provide support for AUT application to automatic welding of the domestic long distance pipeline.

The Chinese new generation of agile Earth Observing Satellites (EOS) has more freedom and more choices on when and how to make an observation, which brings great challenges on planning and scheduling operations due to more complex and detailed mission dynamics constraints. This paper proposes a decision framework combining both on-board and on-ground part to solve the new problem. The on-ground part makes initial operation plans periodically based on estimated mission dynamics. The on-board part will revise the initial plan according to actual mission dynamics when there is no opportunity to communicate with the ground. The main management and control process is divided into four steps and the planning and scheduling problem is tackled in an integrative way. We also explain details of the rule-based heuristic algorithms which are efficient and fitful for complex constraints and limited on-board computing capability. The framework is applied to a simulation system which aims to optimize the satellite designing process. Results of experiments show that the framework and methods are reasonable and feasible.

The variation characteristics of the ultrasonic grinding transducer equivalent circuit parameters under the effect of temperature were studied in this paper. An ultrasonic grinding transducer equivalent circuit model was established. Then an experimental platform was set up to test the variation regularity of the ultrasonic grinding transducer equivalent circuit parameters at different temperatures. The results have important guiding significance for the control and process design of the ultrasonic grinding.

In order to meet the fertilizer agronomic requirements of sugarcane in the hot areas of South China, using the method of notched disk ditching to design a notched disk ditching and fertilizing machine. The static equilibrium equation is established by having the force analysis that the notched disc plow cuts the sugarcane leaves, and the diameter and structural parameters of the notched disc plow are determined. The results of field test show that the working performance of each component of the notched disk ditching and fertilizing machine is stable, and it can primely cut the soil, ditch and prevent winding in the sugarcane fields with a lot of weeds or sugarcane leaves, it meets the fertilizer requirements of sugarcane in the hot areas of South China.

Boring bar for deep hole cutting is often more prone to flutter problems. The traditional boring bar is generally made of metal material. There is a close relationship between the dynamic characteristics of the boring bar and the tightness of the fixed end. In this paper, based on Euler-Bernoulli beam theory, the distributed parametric differential equations of composite boring bar are prensented. The dynamic characteristics of composite boring bar with three different conditions including fixed-free, pinned-pinned-free and spring-spring-free are investigated. The corresponding frequency equations are given. The natural frequency and dynamic stiffness of the composite boring bar are obtained by numerical calculation. The influences of the supporting conditions and the ply angle are studied. The results show that the supporting conditions, layer angle, support spring stiffness and support spacing have an important effect on the dynamic characteristics of the composite boring bar.

Based on the hydraulic proportional loading system for the seat belt anchorage point strength test equipment, the AMESim simulation model of the hydraulic proportional loading system is established. After analyzing the AMESim model and performing dynamic and static characteristics analysis, it is found out that the hydraulic proportional loading system can be further optimized. The PID control optimization method is employed to improve the original proportional control system, After comparing the PID parameter setting with the system before and after optimization, it is shown that the performance of the optimized hydraulic proportional loading system is effectively improved.

CFM56-7B engine has had several ruptures of HPT blades since its service, resulting engine failure during the flight. Through borescope inspection for HPT blade can detect the damage of blade on the front and rear edge effectively, and avoid the use of damaged blades. This paper briefly summarizes the experiences of borescope inspection for HPT blade, mainly using hose to check the defect of leading edge for blade.

Buckling analysis is very important to the structure of long boom, especially for heavy bearing load. In this paper, buckling and fracture process of concrete pump truck boom is studied based on plate-beam buckling theory. The experiment bench of concrete pump truck boom is designed, and the fracture experiment of concrete pump truck boom is carried out. According to the trace of structural strain, instability and fracture critical load of concrete pump truck boom is acquired. The mechanical characteristics of structural material are obtained by experiment, which are used in the nonlinear finite element analysis of concrete pump truck boom. The results show that, buckling instability of partial plate which lies at the side of compression happens easily when concrete pump truck boom is loaded. However the boom structure still has bearing ability in post buckling. Meanwhile, the geometric deforming calculation is proved through research and experiment results in this paper. This method of buckling analysis is often useful to the similar structures.

In order to solve the coupling problem between the variables of the air cushion head-box, the precision of control is improved. The operating mechanism of the flow box is analyzed and the related data are collected. The expert control algorithm for air cushion head-box is put forward. The algorithm is implemented with PLC300. The practice shows that the control algorithm proposed in this paper meets the requirements of control. The practice shows that the control algorithm proposed in this paper meets the requirements of control.

Based on the study of the characteristics of the material, the fixture of the clamping fixture for the milling and milling process was designed and the rough and fine cutting tools and cutting parameters were selected reasonably, Developed its NC milling complex machining program, and in the turning center HTC2050Z lathe milling machine to complete the complex processing, thin-walled titanium alloy parts processing technology to provide support.

For the structural complexity of the manufacturing system, it is difficult to decompose and express the equipment reliability; a three-dimensional method based on Petri nets was proposed to model and calculate equipment reliability of manufacturing systems. This method includes three steps: The first step is to model the equipment chain network according to manufacturing process by Petri nets, and the reduction method of series and parallel Petri nets is used to simplify the complexity of Petri nets; The second step is to model each single equipment reliability by tree Petri nets, fault tree analysis (FTA) is adopted to express single equipment reliability, and then FTA is converted to tree Petri nets according to the conversion rule between them; The third step is to integrate chain and tree Petri nets into three-dimensional Petri nets to express the whole equipment reliability of manufacturing system. Finally, the reliability calculation of engine cylinder manufacturing system is taken as an example to verify the proposed method.

Under the help of intelligent monitoring system, a great deal of manpower and resources can be save in the process of industrial production. The appearance of Internet of things has brought a new solution for intelligent monitoring system. The system combines the advantages of ZigBee's low cost, low power consumption, high reliability and Android platform's highly open resources characters and good expansibility. Furthermore, it adopts ZigBee's tree topology, and selects CC2530, which establishes the intelligent monitoring system. That is helpful for the early prediction of problems before it gets worse.

The high voltage switchgears are playing an important role in the electric power system, but in the long operation, the switch contact tends to become overheating because of its closed and narrow space. Obviously, it will cause the system to malfunction without timely resolution. What's worse, this situation probably result in fearful accidents which will pose a threat to people's lives. Therefore, according to the characteristics of high voltage switch cabinets, this paper designs a wireless temperature monitoring system for high voltage switches. Moreover, considering the problem of high voltage insulation, the ZigBee communication chip CC2530 and the digital temperature sensor DS18B20 which are used to realize the real-time and on-line temperature monitoring are selected to perform the functions of collecting temperature and transmitting information respectively. To some extend, this system improves the efficiency and accuracy of the monitoring, meanwhile, it saves human resources and can make the electric power system run safely and reliably.

In order to make up for the shortcomings of low production rate and frequent accidents in the production of the traditional hand-made artificial flowers, an automatic setting machine for artificial flowers is developed to effectively increase the efficiency and safety of flower production and meet the increasing demand for artificial flowers. This paper introduces the design and realization of control system for automatic setting machine of artificial flower. In addition, the programmable logic controller (PLC) is used as the core of the control system while LCD touch screen as the human-machine interface to monitor the machine. In the test, the control system shows good stability and practicability, and realizes production of the setting machine with high speed and great safety.

The integration of topology optimization(TO) and additive manufacturing(AM) has the huge potential to expand the design freedom of parts. However, traditional topology optimization approaches are not tailored to the particular characteristics of AM processes, resulting in a large number of overhangs in these designs, which lead to use of sacrificial support structures and increase the manufacturing cost. This paper presents an AM-restrained topology optimization approach based on the overhang sensitivity analysis. The overhangs can be explicitly expressed by the design variable and considered to be a minimization goal of the optimization process, in which the overhang sensitivity is combined with other performance sensitivities to update design variables. The effectivity and robustness of the proposed method is demonstrated by the typical cantilever beam and the MBB beam, then validated through the fused deposition modelling(FDM) 3D printing.

The topological structure and related control algorithm of a novel multi-functional 35kV voltage disturbance generator are proposed. Using a 10-stage H-bridge cascade topology in each phase, subsequently a voltage disturbance generator is formed. Combined with the topology of the main circuit, the corresponding control strategy in d-q synchronous coordinates is proposed. The modeling and simulation of the proposed device is implemented by Matlab/simulink, and simulation results show that the topology of the device's main circuit is feasible and the control strategy is effective.

Superconducting magnetic energy storage (SMES) system can be long-term, efficient, non-destructive electric energy storage, the decoupling control can run in four quadrant, can achieve power active power and wattless power real-time fast independent adjustment. It is applied to the microgrid implemented through the SMES dynamic power compensation so as to greatly increase the initiative control of power grid operation. In this paper, the current source type SMES as the research object, the SMES system based on microgrid operation research. A microgrid PSCAD model including SMES system, SMES respectively provide short-term electricity, fault time buffer, improve microgrid power quality, micro smoothing grid and main network switching, optimization of DG improve the operation of microgrid operation economy of simulation study, provide a reference for SMES application in microgrid.

This paper investigates the laminar flow and heat transfer characteristics of liquid in microtubes by considering the solid-liquid intermolecular interactions. We propose an apparent viscosity model of liquid from the wetting theory and the Hamaker theory to account for the interface effect. The numerical simulation considering this model is conducted to study the flow and heat transfer characteristics of liquid in microtubes. Simulation results indicate that the flow and heat transfer characteristics such as velocity distribution, pressure drop, flow friction and heat transfer coefficient deviate from the predictions of the conventional theory. The deviation increases as the hydrophilicity or hydrophobicity increases, and decreases as the diameter of the microtube increases.

Based on the oscillation compaction mechanism, the dynamic model of 'roller-soil' five degrees of freedom was established after the structure of the oscillation roller was simplified. The time-amplitude response characteristics of the oscillatory compaction system under pure rolling condition was analyzed by Matlab/Simulink simulation, and the amplitude-frequency characteristics of the oscillating wheel was analyzed by the design of related tests. The results show that the horizontal vibration of the frame and the above part of the oscillating roller can not be ignored in the practical work; Considering the horizontal vibration of the frame and above. the five degrees of freedom model can better respond to the actual working condition of the oscillating roller; the amplitude frequency characteristic curve provides the theoretical basis for the continuous adjustment and intellectualization of the working parameters of the oscillating roller.

HVDC is well known for its high efficiency and controllability, which is the first choice when it comes to long-distance, colossal-power transmission. Currently, HVDC transmission is a worldwide concerned topic, especially for Australia, where the imbalance of electricity between populated areas and remote regions is a difficulty to be solved. For instance, Basslink, a brilliant HVDC transmission achievement gave a solution to this problem. At the same time, the magnetic and electrical field produced by HVDC is totally different from traditional AC transmission, which, is a special topic worth researching. This paper will investigate the HVDC transmission cable magnetic field's characteristics and its interaction with the nearby cables. The scope of our topic are: the analysis of the magnetic field; how the magnetic field of one cable influences others; what are the advantages and disadvantages of the interactions; the comparison between HVDC transmission and common AC transmission with the grid; use ANSYS to simulate the possible situations of the magnetic field of HVDC Transmission Cable that would happen in the real world; the human exposure to magnetic field are investigated considering different laying configurations, conductor dispositions, and supply conditions.

Bolted joints have a significant effect on the dynamical behaviour of assembled structures. Accurate contact stiffness model of bolted joint is crucial in predicting the dynamic performance of bolted structures. In this research, a modified three-dimensional fractal model of normal contact stiffness is presented to more accurately predict the dynamic characteristic of a bolted assembly. In the present model, while the contact deformation exceed the critical value the elastic-plastic contact is used to take the place of Hertz elastic contact in the traditional M-B model, and revise the drawback that elastic-plastic contact occurs before elastic contact in existing elastic-plastic fractal models. As the increase of contact force, the plastic deformation of single asperity is considered again, which is omitted in the two type fractal models. An experimental set-up with two T-shaped specimen is designed conducted to verify the efficiency of the proposed model. Comparing with the ZX elastic-plastic fractal model, the present model can predict contact stiffness and dynamic performance more accurately, particularly, while for higher contact loads. The results show that the modified elastic-plastic fractal contact model can be used to more accurately predict the stiffness and dynamic characteristic of bolted structures in the machine tools.

The load characteristics of non-contact wireless charging system to electric vehicle are exploited in this paper to improve the output power and transmission efficiency of the system. Firstly, this paper makes a mathematical modeling for the TS-S wireless charging system based on Two-Port Network theory. Then, the features of constant voltage output, output power, and transmission efficiency are discussed later. The results show that TS resonant compensation network could improve the system's output power, and transmission efficiency. After that, the system's frequency and load resistance in the optimal working state are calculated. Finally, simulations and experimental results are presented to verify the correctness from theoretical derivations.

Electric power system has great development in China, the smart grid system is more and more perfect, as the global energy problem gradually revealed, how in the smart grid system of recruiting energy dissipation has become a new research point, through the analysis of the current existing new energy development and given new energy of the main technology, puts forward two Suggestions, the first is to optimize new energy power generation forecasting, the second is give full consideration to the development of distributed power supply.

For DC boosting photovoltaic power generation system, this paper mainly focuses on the theory studies, system construction and algorithm design from three aspects, such as photovoltaic array model and output characteristics, structure and principle of boost system, principle of maximum power point tracking and control method. According to the single peak of the P-U curve and the principle of maximum power point tracking, the maximum power point tracking scheme using the impedance transform function of the boost circuit and the adaptive algorithm is determined. Through the study and analysis of the control strategy of the conventional adaptive algorithm introduced the optimal gradient method, an improved adaptive algorithm that fuses the fixed voltage method, the fitting curve method and the optimal gradient method is proposed. The simulation system is established to verify the simulation. The corresponding experimental results prove the validity of the designed photovoltaic power generation system and the improved adaptive algorithm, which improve the speed and accuracy of maximum power point tracking, and solve the wrong judgment of maximum power point

The main models used in electricity price forecast have been reviewed in this paper. Several statistical models based on machine learning algorithms have been tested and compared to forecast the next-day hourly electricity price in Nordpool electricity market. Stationarity of electricity price has also been studied and it is concluded that electricity price is daily seasonal. Many features of both local region and neighboring regions from the past week have been respectively analyzed in terms of the importance to electricity price forecast. Results show that local zone, compared with neighbor zones, exerts the major influence on electricity price. Meanwhile, price is the most important category other than categories like demand, wind generation or transmission congestion rate. Hydro reserve is also an important parameter to electricity price forecast.

An induction motors early fault diagnosis method was presented in this paper, based on Motor Current Spectrum Analysis (MCSA) and Support Vector Machine (SVM). After the stator current was sampled and transferred in FFT, the fault feature was extracted as the input of the SVM. The multi-fault SVM classifier was constructed based one-against-one strategy and mixed matrix combination, to perform the fault diagnosis and classification of different types of faults. Experiment results show that the method in this essay achieved good performance of classification under nonlinear, high dimension and small sample sets, which improved the accuracy in motor fault diagnosis.

Energy consumption prediction for machining process is the basis of the study of energy performance and energy efficiency assessment in manufacturing systems. The existing energy consumption prediction methods for manufacturing process are mainly focused on processing equipment, processing parameters and material. However, part features are also important impact factors for energy consumption of manufacturing process, but these are not studied systematically. In this paper, an energy consumption prediction method based on part feature is proposed. Firstly, the energy consumption of a part feature was analyzed, and an energy consumption model was established based on part multi-features by using matter element theory. Then, a hybrid reasoning method considering case-based reasoning and rule reasoning was studied, and an energy consumption prediction method of manufacturing process was proposed. Finally, a case study of a shaft part was given to verify the effectiveness of the above methods.

As China transforms from a big dredging country to a dredging power, dredging vessels have unprecedented development opportunity and expansion space. Cutter suction dredgers are rapidly becoming more effective, greener, and more energy-efficient. In order that cutter suction dredgers are adaptive to the landform and soil texture in complex water areas and secondary pollution is contained, this thesis develops a new type of environmentally friendly double-cutter suction dredger with SolidWorks and conducts simulation analysis based on ANSYS. Compared with the single-cutter structure, the concentration distribution at the suction outlet in the double-cutter structure has increased and the diffusivity has decreased, effectively reducing secondary pollution. When the total dredging outputs stand at the same, the double-cutter suction dredger is more energy-efficient and environmental friendly than the existing dredger, which reflects its reliability and advancement.

CLC Number: U674.31 Document Code: A

In recent years, with the rising demands one indoor comfort, the use of air conditioners is becoming more and more widespread. The energy consumption of air conditioners is rising, accounting for about 40%-60% of the total building energy consumption^[1]. During the use of air conditioner in summer, the disordered discharge of condensate water and the excessive temperature of external machine are two major problems that need to be improved. In view of these above problems, we have designed a new type of self_powered external cooling shell of air conditioner. It includes condensate water collection subsystem, solar panel cover subsystem, energy storage subsystem, intelligent control and ultrasonic atomization subsystem. The purpose of this device is to collect the useless air conditioner condensate water and cool down the air conditioner external machine. This device can not only save water, but also enhance the effect of air conditioner refrigeration, save electric energy and enhance the service life of air conditioner.

The hybrid power is an important research in the research field of new energy power system, and its strict operating process and running status influence the performance and life greatly. To aim at the problem, the structure of hybrid power was given out at first. Secondly, the modeling of hybrid power fuel cells was advanced based on electrochemistry. Then the modeling structure, algorithm, and simulation of electrical characteristics of hybrid power fuel cells were particularly presented. Finally, the 1kW experiment of hybrid power fuel cells was finished for the operating and running process. The research result is provided for the suitable engineering model of matching and control of hybrid power system at the view of application.

The traditional mechanical cutting edge honing has some disadvantages, such as low efficiency and edge profile irregularities. Based on the phenomenon of rapid erosion on sharp corners by electrolysis and flowing abrasive to remove the oxide films, an innovative electro-abrasive honing process on the cemented carbide cutting edge is proposed. An accurate rounded contour is formed to enhance the edge strength. There are little micro-chipping or grinding traces observed near the cutting edge after honing. The surface roughness decreases from Ra0.31 to Ra0.14 inspected by white light interferometer (WLI). However, some micron-grade craters appreciably extend further into the rake/flank faces. The Co content decreases from 5.8% to 0.6% detected inside the corrosion craters by energy dispersive spectrometer (EDS). It demonstrates that the microstructure of corrosion crater is formed in the high-grade Co areas because Co has a lower electrode potential than W. Some impurity elements K, Cl, Na and N, detected in the micro craters, are estimated as the residual of electrolytes. The results of the honed surface element data show that only W, C and no oxides appear. It is verified that to remove oxide films by the electro-abrasive process is feasible.

Directing against the current complex operating environment of orchard operation machine and in order to reduce the labour intensity of workers, an automatic obstacle avoidance control system for orchard operation machine is designed. This control system takes the micro-controller as the core and collects the signal of surrounding environment. After the signal is processed and then compared by the host computer control system with the per-set alarm value, the control system will send commands to control the machine to start or not start the obstacle avoidance system, and meanwhile will control the braking and steering of orchard operation machine to adjust its operation and machine interfere with the next moving trajectory of orchard operating machine.

In order to depict internal mechanism of complex adaptive agent system and improve capabilities of computer-assisted modelling, a new modelling approach is presented by the combination of Time Petri Net (TPN) and multi-agent technology. In the methods, agent is viewed as basic modelling element and Petri net is used to describe the static rules of agent. Because of the TPN model combining the advantages of time Petri net and multi-agent technology, the state space explosion of complex adaptive agent system is prevented. As an example, the crane scheduling system is defined as complex adaptive agent system. The results that proposed system can complete scheduling task of the steel-making continuous casting and provide guidance for optimizing production systems and exploring operation mechanism.

With the industrial production of shoes and the continuous improvement of production technology, the total production of shoes has been increasing, a wide range, the existing categories including sneakers, leather shoes, plastic shoes, work shoes and all kinds of woven sandals, the material of shoes is increasing, at present old shoes are still landfill and incineration as the main treatment methods, many foreign countries or companies have established their own old shoes recycling system, through the old shoes recycling status analysis, summed up the existing old shoes treatment methods for reference.

We have investigated the band structure and charge distributions of very tiny InAs/GaAs core/shell nanowires in wurtzite structure by using first principles calculations, which indicates that the electrons and holes are spatially localized at the GaAs-shell and InAs-core regions, respectively. In addition, the band gaps of the studied core/shell nanowire are close to the optimum band gap for a single-junction solar cell of about 1.5 eV. Furthermore, the band structure of the C₂S₂ nanowire (with two InAs layers and two GaAs layers) varies significantly with applied axial strain and the charge carriers keep separated when the applied strain is in the range of -2.6% to 3.9%, which is important for the application of solar cells. Our results indicate that InAs/GaAs core/shell nanowires should be a suitable candidate for solar cells.

The polyester fiber was utilized to fabricate the woven spacer fabric on the common loom, and the sandwich panels were produced by resin transfer molding process (RTM). The parameter of RTM molding process was determined. The correct ratio of resin, curing agent and accelerator in RTM process is 100:86:1. The injection temperature is 65°C. Injection time is shorter than 2 hours. Flexure and flatwise compression of composite panels were tested. The experiment result shows: flexure property and flatwise compression property of the RTM composite panels are better than that produced by handle paste shaping process.

Lathe is a kind of machine tool that use lathe tool to cut and profile spinning pieces, and is the most widely used lathe in mechanical manufacturing and assembling factories. So it is called the "Mother" lathe. Because of phenomena like being misused in the process of operation, conventional lathe cannot be normally operated, which has dramatically impacted the efficiency and the pace of working. In order to improve the reliability of our lathe, we come up with two technological methods——one is to improve the lathe tailstock "T" type three nuts to lengthen its life-span, the other is to make improvements to square turret lathe set screws to guarantee its better flexibility.The first section in your paper

In order to realize the shore power access for the ships to be released at the Three Gorges anchorage and mitigate the discharge of vessels in the Three Gorges anchorage, and based on the analysis of the electricity demand of the ships to be released at the Three Gorges anchorage, a set of photovoltaic - shore power complementary power supply system built on the platform of pontoon catamaran has proved the social benefits of the design, providing the basis for the design and application of solar energy in the field of marine shore power.

The implementation of the project is a complicated system. With the complexity and accuracy of all kinds of project construction and calculation of engineering quantity requirements continue to increase, the common project cost management system has not met the construction project management requirements. This paper combines the mature and effective theory of fine management in manufacturing management and introduces BIM5D model and its core technology. It aims to explore fine management mode of project cost based on BIM5D, change the present situation of the project cost management, and ultimately to achieve the goal of increasing the value of project management.

The chopped roller is the main working part of green fed harvester, of which performance directly affects the cutting effect and power consumption of the machine. A new type hob-type closed chopped roller is designed because of the large cutting resistance of the harvester, and the blade on the roller is arranged in a double row herringbone. It does dynamics analysis for chopped roller and gets three affect parameters, they are cutting speed, sliding cutting angle and grinding blade angle. Under the condition that the blade sharp degree is consistent, take the cutting resistance torque as test aim, the influence of cutting speed, sliding cutting angle and grinding blade angle to cutting resistance torque was studied by using orthogonal test of secondary rotation, the main order of the influence of each factor on the index is cutting speed > grinding blade angle > sliding cutting angle. When the cutting speed is 1200 r/min, sliding cutting angle is 25°, grinding blade angle is 25° which is the best parameter combination for the cutting resistance torque. The experimental results provide data support for further optimization of the chopped roller.

The failure modes of carbon fiber reinforced composites (CFRP) was investigated in this study. A method of combination of Hashin model and cohesive elements was proposed to predict failure behaviors in T300/PR319 and AS carbon/epoxy laminates by FE model, while executing three-point bending test. The result shows that there are differences between the response of two materials during bending test. Fiber compression and matrix tension in T300/PR319 and AS carbon/epoxy appears first relatively. Subsequently delamination occurs in AS carbon/epoxy as a result of cohesive elements. A evaluating method of measuring fracture process displacement was also proposed under new damage criterion.

In the rapid prototyping technology, the step effect of the data error and the approximation error of the STL format would affect the machining accuracy. In this paper, we have studied the cause of the error and the method of improving the machining precision. Manufacturing precision of rapid prototyping not only has decisive significance but also influences the stability and service life of parts, so the study on rapid prototyping manufacturing accuracy is very important.

Combining the development of catenary-powered ship at home and abroad, the theoretical development and technological research dynamics of catenary power ship is reviewed and summarized mainly from the aspects of the design of power receiving devices and the prevention of ship offset technology. Responding to the background of promoting low-carbon transportation and energy conservation and environmental protection in China, the prospects for the further development and promotion of catenary power ship are expected to provide a certain reference for the research and development of the catenary-powered ship

CNC machine tools are a complex and variable system with a large number of energy-consuming components and the energy consumption type covers the field of electromechanical liquid. Therefore, it is of great significance to study the energy consumption of CNC machine tools in order to find energy conservation and emission reduction, improve resource utilization, reduce environmental pollution, and promote green manufacturing. This paper analyzes the energy consumption form and characteristics of a typical machine tool, combines the machining status of the machine tool, and studies the various energy-consuming components of the machine tool, establishes the power balance equations of each state, and the specific energy consumption and energy efficiency model of the machine tool. The model combines the energy consumption characteristics and machining status of the machine tool, and lays a theoretical foundation for the research of the energy of the CNC machine tool.