Table of contents

Due to recent pandemic, the 2022 3rd International Conference on Mechatronics Technology and Intelligent Manufacturing (ICMTIM 2022) which was planned to be held in Hangzhou, China, was held virtually online during April 15-17, 2022. The decision to hold the virtual conference was made in compliance with many restrictions and regulations that were imposed by countries around the globe. Such restrictions were made to minimize the risk of people contracting or spreading the COVID-19 through physical contact. There were 90 individuals who attended this on-line conference, represented many countries including Malaysia, USA, India and China.

The ICMTIM 2022 conference will be held once a year, aiming at bringing together scholars, experts, developers and technicians in the fields of mechatronics and intelligent manufacturing to a platform for academic exchanges, and providing a platform for sharing scientific research achievements and cutting-edge technologies, understanding academic development trends, broadening research ideas, strengthening academic research and discussion, and promoting industrial cooperation of academic achievements. The conference invites experts, scholars, business people and other relevant personnel from universities and research institutions at home and abroad to attend and exchange.

The list of Committees are available in this pdf.

All papers published in this volume have been reviewed through processes administered by the Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.

• Type of peer review: Single Anonymous

• Conference submission management system: Morressier

• Number of submissions received: 59

• Number of submissions sent for review: 56

• Number of submissions accepted: 31

• Acceptance Rate (Submissions Accepted / Submissions Received × 100): 52.5

• Average number of reviews per paper: 2

• Total number of reviewers involved: 9

• Contact person for queries:

Name: Xuexia Ye

Email: xx.ye@keoaeic.org

Affiliation: AEIC Academic Exchange Information Centre

The high-speed solenoid valve is the core component of the cotton foreign fiber machine, and its dynamic response characteristics of high-speed air flow at the inlet and outlet are the key to determine the accuracy of foreign fiber strike. In order to improve the dynamic response performance of high-speed solenoid valve under variable working conditions, based on the electromagnetic action mechanism of solenoid valve, the parameter analysis model of high-speed solenoid valve for outlet pressure optimization is established in COMSOL. Taking the inlet pressure and driving voltage of solenoid valve as the system optimization variables, the high-speed response law of outlet pressure rise lag time and outlet pressure change is obtained. The simulation result shows that when the driving voltage of solenoid valve changes from 21V to 27V, the lag time of outlet pressure rise decreases by 57.8%. When the inlet pressure increases from 2 bar to 7 bar, the lag time of outlet pressure rise decreases by 48.14% and the change rate of inlet and outlet differential pressure decreases by 8.4%. The dynamic optimization test system of high-speed solenoid valve parameters is built to verify the simulation results, and the change trend consistent with the simulation results is obtained.

With the iterative development of industrialization and automation, more and more mechanical and electrical equipment rely on the joint operation of multiple motors, and the efficient operation of mechanical and electrical equipment benefits from the reliable cooperative control of multiple motors. Therefore, to ensure the stability of multi-motor coordination control and improve the precision of multi-motor coordination control has important practical significance. In this paper, the multi-motor master-slave controls structure and ring-coupling control structure with random disturbance are simulated and analyzed, and it is verified that the annular coupling control structure has stronger anti-interference ability and higher control accuracy under random load disturbance in the case of four-motor coordinated control.

In order to complete the monitoring and early warning of radar antenna transmission device with more and more frequent faults, a gear fault judgment method suitable for radar equipment is proposed in this paper. According to the fault characteristics of radar antenna transmission gear, the motor current frequency difference of transmission mechanism under normal and fault conditions is compared, and the simulation experiment is completed. The simulation results verify the feasibility and correctness of this method.

Phase-control technology requires a sufficiently small dispersion of switching operation times, however, even though the switch itself is sufficiently stable, action time dispersion is still a key issue in phase-control technology due to various factors. In this paper, by building a simulation and test model of the hybrid mechanism, the action time variation caused by influencing factors such as fast switching temperature, capacitance voltage, capacitance degradation are investigated, and the test and simulation data are collated and analysed form a database. The Generalized Regression neural network has excellent prediction, self-learning, non-linear mapping and tolerance capabilities, and the prediction error of the GRNN algorithm is verified to be less than 0.2ms for the closing time.

In this paper, we mainly study the flow and heat transfer performance of a 300kW micro gas turbine plate regenerator. We built three-dimensional structural models of high-temperature single-channel, low-temperature single-channel, and heat exchange units. In the meantime, large-scale commercial CFD software is used for numerical simulation analysis. We have optimized the channel structure in the low-temperature side guide zone. The results show that: the pressure loss of the low-temperature side channel is reduced by 18.7%, and the efficiency of the regenerator is increased by 0.02%.

In order to solve the problem that it is difficult to extract the early fault of rolling bearing under the background noise, a rolling bearing fault diagnosis method based on TVFEMD-SVD and random forest algorithm is proposed. In this method, the original vibration signal of the bearing is decomposed into a series of eigenmode components with physical significance by using time-varying filtering empirical mode decomposition. The components with higher fault information are selected according to the kurtosis, and SVD decomposition is carried out. The singular values obtained by decomposition are input into the random forest as eigenvalues for bearing fault diagnosis. Experiments show that this method can effectively diagnose the fault of rolling bearing.

Measuring the vibration signal of transformer is one of the ways to verify whether the transformer is faulty. In this paper, taking the vibration detection of transformer as the technical starting point, the signals before and after the vibration fault of transformer are compared by frequency spectrum analysis, and the vibration fault detection of transformer is realized. The vibration test system is constructed and tested in the field. The results show that the non-contact vibration sensor can be used to detect the uninterruptible power failure of the transformer through spectrum analysis and processing, which is simple, safe and reliable, and has good application value.

The inverted pendulum problem is a classical problem. The inverted pendulum starting at a random position keeps moving upwards and aims to reach an upright position. The problem has been solved through some methods based on deep reinforcement learning (DRL) such as Deep Deterministic Policy Gradient (DDPG). However, DDPG also has disadvantages. Deterministic policy is not conducive to action exploration. Moreover, the Q value needs to be estimated reasonably accurately for the policy to be accurate. Nevertheless, at the beginning of the learning, there is a certain difference in the Q value estimation, and the parameters learned at this time are easy to deviate. Therefore, this paper combining AdaBound with DDPG algorithm proposes an optimization method for the inverted pendulum problem, and compares the performance with that of four published baselines. The experimental results show that for the inverted pendulum problem, the proposed method outperforms the above four baselines to a certain extent.

As the key link of power transmission in the power distribution system, the distribution transformer is the core of the entire power distribution system and is responsible for the electrical connection between the medium voltage side and the low voltage side, and based on this to further ensure the stable operation of the power distribution system. Data types, sources, selection principles and data processing methods relate to the operating state of distribution transformers; then expound the meaning of operating state indicators, and build a distribution transformer operating state index model; finally, an improved weight method is used to determine the distribution transformers of the weight coefficient of the running status indicator. Therefore, it is appropriate to verify the membership function and membership matrix selected in this paper. It is suitable for the fuzzy comprehensive evaluation calculation of the reliability of distribution transformers, which verifies the accuracy of the reliability evaluation results. The maintenance strategy of distribution transformers based on reliability assessment can be optimized according to the operation status of the equipment so as to improve the operation reliability of distribution transformers and ensure the safe, reliable and economical operation of the equipment. The maintenance strategy of distribution transformers based on reliability assessment can be optimized according to the operation status of the equipment, which is to improve the operation reliability of distribution transformers and ensure the safe, reliable and economical operation of the equipment.

Maglev plane motor (MLPM) is a new type of plane motor. It's main electromagnetic structure is composed of permanent magnet array and coil array. The physical hardware basis of magnetic levitation plane motor (MLPM) is permanent magnet array. The key problem in the design of magnetic levitation plane motor (MLPM) is how to obtain high driving efficiency, reduce harmonic interference, and form a planar permanent magnet array with good expansion and technology. Through research, it is found that Halbach permanent magnet array has this advantage. In this paper, physical simulation software COMSOL is used for finite element modeling of Halbach permanent magnet array, which provides a basis for subsequent parameter optimization.

We propose a miniature FBG(Fiber Bragg Grating) interrogation based on the LVF(Linear Variable Fliter ), which is very suitable for measurements in aircraft because of its small size, light weight and vibration insensitivity compared to conventional interrogation. We analyzed the relationship between the performance of the interrogation and the optical properties of the LVF by simulating the light passing through the LVF demodulator by means of theoretical simulations before the actual construction of the instrument, and we also find that the inhomogeneous illumination of the incident light can impair the performance of the interrogation.

Various curvatures can be drawn between two different points. However, what curve will yield the fastest descent for an object to travel from the higher point to the lower point under the force of gravity alone? This essay utilizes theoretical methods such as calculus, optimization, and parametric equations and experimental approaches to show that a curve - shaped like a cycloid - will yield the fastest descent. This conclusion has practical applications for the design of roller coaster trajectories along with other entertainment facilities.

Lifting facilities electromechanical servo system has a compact structure, high specific power, high control accuracy, low vibration and noise, high reliability. In recent years, small and medium power electromechanical servo systems have been widely used in the aerospace field, and the application of distributed high-power electromechanical servo systems in the naval field to replace the traditional valve-controlled centralized ship-wide hydraulic servo system has a broad application prospect, becoming one of the important links to achieve a new generation of "all-electric" ships. But along with the power level, electromechanical servo system electromagnetic compatibility problems are increasingly prominent, and must be considered from the system design in a comprehensive manner. This paper takes a ship electromechanical servo system as an example, starts from the system functional unit, combines the ship and servo system electromagnetic environment characteristics, sorts out the key links of each unit electromagnetic compatibility control, and takes targeted measures in the electromagnetic compatibility design, the product finally passed the electromagnetic compatibility test, which can provide reference for electromechanical servo system electromagnetic compatibility design.

As the application of "China Intelligent Manufacturing" in the field of production becomes more and more extensive, it becomes crucial to ensure the security of information interaction between production equipment. China's domestic encryption algorithm - SM4 block encryption algorithm came into being. The algorithm consists of a key expansion function and an encryption and decryption function. The key expansion function collects 128-bit keys at a time, and generates thirty-two 32-bit encryption keys after XOR operation, nonlinear permutation operation (S-box) and linear shift operation.The XOR operation parameter CK of the original key expansion function is obtained by the modulo method, which is similar to the system parameter FK and is a fixed value. In order to reduce the risk of deciphering caused by fixed parameters, the lightweight two-dimensional chaos algorithm Hemon is introduced for optimization design. The system parameters used in the SM4 algorithm are randomly generated with the change of the key, which improves the security of the algorithm. And use the hardware encryption platform ZYNQ-7000 series model xc7z100ffv900-1 FPGA side design and implementation, relying on the hard to decipher of hardware encryption to complete the optimization of SM4 algorithm key exchange.

In motor control, the stable control of motor speed and the stability in the face of sudden torque are two important indicators to evaluate the quality of the control system. This paper proposes a multi-island genetic algorithm (MIGA) and fuzzy PI vector control algorithm. Combined with the asynchronous motor control method, the simulation test and bench test are carried out. Taking the Integral Time Multiplied by the Absolute Value of Error (ITAE) minimum as the optimization goal, the MIGA optimization algorithm is used to obtain the optimal solution for the quantization factors k_e0, k_ec0, proportional factors k_up, k_ui of the fuzzy PI controller. The optimal parameters are imported into the asynchronous motor control model for simulation verification and bench test verification. The simulation test shows that the fuzzy PI control method optimized by MIGA can effectively reduce the speed rise time, overshoot and steady-state error. When the load is suddenly applied, the speed drop is 5.16 r/min, and the adjustment time is 0.015s. The bench test shows that: under the changing load, the change trend of the speed curve of the simulation and the test is basically the same, which proves the correctness and effectiveness of the algorithm proposed in this paper.

In the paper, a PI fault tolerant method based on LQR (Linear Quadratic Regulator, LQR) is proposed for the coal mine motor servo system. In the proposed strategy, the proportional part is arranged in the feedback loop of the control system firstly, so that the PI control law can be described in the form of system state feedback. And then the PI fault-tolerant control law is obtained based on the PI control law, the parameters are adjusted adaptively with the LQR control method Finally, the proposed method was applied to an electric motor, the simulation illustrates the effectiveness of the proposed method.

Aiming at the problem of coupling alignment, a dynamic alignment method based on laser method is proposed and verified by simulation. The design content mainly includes: the collection and processing of sensor current, the data processing of single chip microcomputer, the communication of upper computer and the writing of program. The results show that the designed alignment method can display the changes of various data in real time and monitor the alignment state of the coupling in time.

In order to meet the needs of the development of high-performance micro-engine, the micro-turbine is faced with the technical challenge of high-load and transonic flow. At present, the flow characteristics and loss mechanism of high-load micro-impeller are not clear. In this paper, the flow characteristics of high-load micro-turbine rotor are studied. The results show that the loss in rotor trailing edge is the main factor that affect the operation of the micro transonic turbine, and the key to reduce the loss is to reduce the wake diffusion range and the Mach number in front of the extended shock wave. By adjusting the local curvature of the front in front of the incident point of the back-extension wave in the throat of the suction surface, the convergent-divergent ratio is in the range of 1.04 ~ 1.08. Meanwhile, the Mach number of wave front can be reduced by 3.4% and the reflection of trailing edge inward extension can be effectively suppressed, and the total rotor pressure loss coefficient can be reduced by 14.1% at most. The thickness has an important effect on the wave strength and wake loss in the trailing edge. When the relative thickness of the trailing edge decreases by 50%, the maximum Mach number on the suction surface decreases by 7.8%, the turbine stage efficiency increases by 1.92%, and the relative thickness of trailing edge is 0.124~0.185, the studied micro-transonic turbine performs better.

Full composite pole-aluminum conductor composite core system is gradually used in the 10kV distribution network. In order to study the different ice-shedding forms of the dynamic response of this distribution system, the author established a conductor-insulator and pole-conductor system with two finite element models to study the linear section and corner section of the line in different forms of ice-shedding and ice-shedding rate under the influence of the line ice-shedding response degree. The results show that the pole-conductor model is a good model for the design of distribution lines with carbon fiber cores. The results also show that the ice jump height of the pole-conductor model is smaller than that of the conductor-insulator model, which is related to the coupling relationship between the composite pole and aluminum conductor composite core. The stay wire of the corner pole will absorb most of the energy generated by ice-shedding. In addition, when non-uniform ice-shedding, the line vibration is more violent, the jump height is higher, and the maximum axial force generated after ice-shedding is greater, which has certain safety risks.

It is of great significance to study the operation optimization of thermal power units under the new situation and the economic operation under low load. The bearing vibration of a 600 MW thermal power unit has been too large since it was put into operation, and steam distribution optimization and sliding pressure optimization were not carried out since the unit was put into operation. In order to solve the vibration hidden trouble of the unit and explore the energy saving potential, the operation optimization test of the steam turbine is carried out. When the valve sequence is changed from GV1/2-GV4-GV3 to GV2/3-GV1-GV4, the maximum vibration of #2 bearing decreases from 150-170 μm to 50-60 μm, and the maximum vibration of #1 bearing decreases from 90-100 μm to 30-40 μm. After optimization of steam distribution, the regulating characteristics of the unit are improved obviously, and the gap between the equivalent main steam flow feedback and the ideal value of the overall flow characteristics of the sequential valve decreases from 15.20% to less than 1%, and the load and valve of the unit change steadily in the process of switching between single valve and sequential valve. Five load conditions were carried out in the sliding pressure optimization test, and the sliding pressure curves were obtained when the back pressure was 3.35kPa, 4.9kPa and 7.95kPa. After optimized operation, the coal consumption of thermal power unit is reduced by 1.47g/(kW⋅h) on average.

Metal-Oxide Arresters are important equipment to ensure the reliable operation of power systems. An experimental protocol for judging the nature of MOA defects accurately is introduced in this paper and applied to engineering practice. Through diagnostic tests and dismantling inspections, it is determined that a certain batch of 110kV line MOA has a familial defect of poor sealing. Then, the reasons for dampness are analyzed, and other defects except the dampness of the varistor are discovered. Besides, the improvement of manufacturing process is proposed from aspects of terminal structure and the coating material on the side of varistor;the actual data proves that adding fillers such as quartz sand or silica gel inside the MOA can reduce the failure rate effectively. This article provides a certain technical reference for the manufacture and defect disposal of MOAs.

This paper designed the control system of a new intelligent tree-climbing and pruning robot which included the control of remote control mobile terminal and intelligent control terminal. Remote control module, power circuit, motor drive, automatic holding detection, height detection, side branch detection and other modules were designed, Then the main program based on STM32 embedded MCU, interrupt program and communication program were designed. The control system could enable the tree climbing robot to climb automatically, detect the side branches in the climbing process, trim the side branches automatically, and saw the top branch after climbing to a certain height. The robot also had the function of image monitoring. Through image monitoring, the working process of the robot could be adjusted remotely. Finally, the prototype was tested. The test results showed that the selection of controller and sensors were appropriate, the design of remote control circuit, motor driving circuit and detection circuit was reasonable, and the structure and algorithm of the program were reasonable. The development of the prototype laid a foundation for the popularization of fast-growing forest pruning robot.

Most of the existing transmission line tower foundations are cast-in-place foundations, and there are many obvious disadvantages of this operation method, such as its long construction period, poor generality, and inability to construct in winter. In this paper, we propose an assembly type prefabricated foundation for 66kV transmission line towers. And use SOLIDWORKS to simulate and analyze the mechanical properties of the foundation, analyze the current density distribution of the designed foundation with CDEGS simulation, and add reinforcement cage to optimize its current density distribution. The results show that the designed foundation meets the requirements of its working conditions.

In practical applications, the geological environmental monitoring instruments should have more stringent instrument properties, their resistance to high and low temperature, sealing, corrosion resistance and low power consumption, They are all have higher requirements. While the areas whitout public network coverage are mostly alpine high - altitude areas, the instruments are exposed to relatively harsh geological conditions for a long time. The timely and stable data communication transmission technology is the key technology to ensure stable operation of groundwater dynamic monitoring systems. At present, GSM short message format is mostly used in the groundwater dynamic remote monitoring technology, but this approach is extremely limited in field applications. For obtaining groundwater monitoring parameters not affected by the limitation of public wireless network coverage area, the GPRS satellite positioning and short message technology is adopted, and a kind of data transmission communication apparatus using GPRS satellite is researched. After a large number of indoor debugging and field stability tests, it is proved that the control terminal of groundwater dynamic monitoring and communication developed based on GPRS satellite communication features stable data transmission, low power consumption, good resistance of wind, sand and moisture. It solves the transmission obstacle of groundwater monitoring data in the area without mobile phone signal, and realizes multi - mode groundwater monitoring communication.

For the servo dual motor linkage lag and large error problems, electronic cam curve planning is introduced. This servo system uses Microchip's MPLAB development platform and consists of a digital servo driver, two servo motors, etc. The servo motors use a vector control strategy. The position command of the slave servo motor is calculated according to the speed of the spindle motor and the electronic cam table, and the reciprocating motion of the motor pendulum is realised by simulating a mechanical cam, and the five-term and one-term curves are used to articulate with each other in the acceleration, uniform speed and deceleration stages. The experimental results show that with the electronic cam scheme, the servo system combines the advantages of high response speed and high control accuracy, while the curve planning and parameters are easy to adjust and meet the requirements of industrial production.

The accuracy of high speed five-axis machine tool is mainly determined by the contour accuracy of machine tools. The contour accuracy evaluation and improvement of 5-axis machine tools have always been concerned. In order to simplify the calculation of five-axis contour error considering the synchronization between tool tip position and tool orientation, a novel five-axis contour evaluation index TCCE(Two-point Cutter location Contour Error) is proposed in this paper, which is based on the tool axis trajectory surface. The calculating method of the proposed index by NC servo encoder input from 5-axis machine tools is introduced. Finally, the experiment is performed to evaluate the trajectory accuracy and servo matching performance of the machine tool with the proposed contour error evaluation index and the calculating method.

Bidirectional isolated AC-DC matrix converter is a new topology which has potential advantages in many aspects. But the topology of bidirectional isolated AC-DC matrix converter is complex, the front and rear circuits are coupled and interact with each other, it is difficult to decouple it directly, and it is difficult to modulate. So it is necessary to study its modulation strategy. In this paper, several existing modulation strategies are analysed and compared from three aspects: switching process, current stress and transmission power, and a relatively optimal modulation strategy is obtained. The superiority and correctness of the modulation strategy are verified by simulation.

For the problem that the traditional manufacturing method of spacecraft integral panel can not meet the manufacturing precision of the complex lightweight integral panel of the new generation of spacecraft, a method of roll bending in the state of flat plate first and then machining the grid features of the outer surface is proposed. ANSYS is used to simulate and analyze the internal stress when the integral panel with different roll bending radius when fitting with the tooling. It is obtained that it is easier to realize clamping and bonding by controlling the roll bending radius of the integral panel according to the negative difference. The clamping and positioning of the integral panel with vacuum adsorption device and the machining with variable helix angle milling cutter can effectively reduce the machining vibration. Combined with the processing compensation based on detection, the problem of out of tolerance of wall thickness in processing is solved, and finally the consistency of wall thickness is guaranteed. The experimental results show that this method can control the wall thickness of the integral panel within 1.05~1.33mm.

The rendezvous problem in the autonomous aerial refueling (AAR) was researched for the receiver unmanned aerial vehicle (UAV). The three-dimensional guidance model was constructed for the UAV to pursue the virtual tanker. In order to guarantee the zero miss distance and the intercept angle constraints, a nonlinear rendezvous guidance law was designed for the UAV based on the Lyapunov stability theory. The guidance law generated the normal acceleration command and the lateral acceleration command. The velocity control system was designed by the sliding mode control method. It controled the UAV's velocity to equal to that of the virtual tanker at the end of the rendezvous phase. The simulation results validate the effectiveness of the designed nonlinear guidance law and the velocity control system.

The dynamics of quadrotor UAV is described considering internal uncertainty and external disturbance. The control system of quadrotor UAV is divided into inner loop attitude control system and outer loop position control system, In order to solve the problem of underactuated character. Three virtual control variables are introduced to decouple the position dynamics. Three sliding mode disturbance observers (SMDOs) are designed to estimate the total disturbances in the position dynamics. Then three sliding mode controllers (SMCs) are designed to drive the trajectory tracking errors to zero asymptotically. The simulation example is carried out to test the effectiveness of SMDOs and SMCs. Simulation results validate that the designed SMDOs and SMCs provide both fast exact tracking capability and strong disturbance rejection capability for the quadrotor UAV.

As the power source of a hydraulic system, hydraulic power unit also act as the main vibration and noise source. In this paper, systematic noise source characteristic and vibration performance of the low-noise modular hydraulic power unit are analysed, and specific measures to reduce vibration noise in the design process are studied. Firstly, through dry and wet mode analysis of the system, it is proved that the optimization of the pipeline and the oil tank separator plates should be emphasized in the system design. Based on that, by identifying the exciting forces of the motor and applying them to the analysis model, the vertical acceleration vibration response of 16 measuring points could be calculated. The results show that the attenuation of shaft frequency vibration noise should be focused in the acoustic design of the system. Above all, this paper provides a way in low-noise modular hydraulic power unit design.