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检索条件"机构=Mechatronics and Controls"

共 568 条记录，以下是21-30 订阅

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OPTIMIZATION OF DYNAMIC CHARACTERISTICS ON THE REDUNDANT ELECTRO-HYDROSTATIC ACTUATION SYSTEM FOR LAUNCH VEHICLE

OPTIMIZATION OF DYNAMIC CHARACTERISTICS ON THE REDUNDANT ELE...

引用

2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Huangfu, Yushi Hu, Yizhou Chen, Keqin Lan, Tian Zhao, Chun Zhao, Tong Beijing Institute of Precision Mechatronics and Controls Beijing China Innovation Center for Control Actuators Beijing China

In order to improve the dynamic control performance of the servo system for launch vehicle, based on the working principle of dual-redundancy electro-hydrostatic actuation system, a closed-loop mathematical simulation model of position, speed and current was established. The simulation model was modified by analysing the correlation between the simulation results and the hot-firing experimental results;thus, the accuracy and effectiveness of the model were ensured. The control parameters of electro-hydrostatic actuation system position loop, speed loop and current loop were optimized based on Particle Swarm Optimization algorithm. The experiments were finished in a load simulator with the optimized control parameters. The result showed that frequency bandwidth at -45°phase was improved from 24.87rad/s to 29.14rad/s, which verified the effectiveness and technical feasibility of the control parameter optimization method. © The Institution of Engineering & Technology 2024.

关键词： Launch vehicles

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Design and implementation of intelligent equipment early warning system 9

Design and implementation of intelligent equipment early war...

引用

9th International Symposium on Computer and Information Processing Technology, ISCIPT 2024

作者： Yang, Yujie Xue, Meifang Guo, Yunqi Xue, Jingsong Beijing Institute of Precision Mechatronics and Controls Beijing China Innovation Center for Control Actuators Beijing China

ISBN: (纸本)9798350388404

The paper explores the application of association rule algorithms in big data for equipment management systems. It introduces an enhanced Apriori algorithm employing Boolean matrix operations and multi-tree pre-screening, improving efficiency and accuracy. By mining association rules, the system enables intelligent operations like equipment failure prediction and maintenance, reducing costs and enhancing system uptime. Experimental results demonstrate significant advancements, particularly in low support scenarios, enhancing data mining effectiveness. © 2024 IEEE.

关键词： Mining equipment

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RESEARCH ON OPTIMAL CURRENT CONTROL STRATEGY FOR STARTING PHASE OF FIVE-PHASE MOTORS

RESEARCH ON OPTIMAL CURRENT CONTROL STRATEGY FOR STARTING PH...

引用

2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Li, Qiqi Xu, Zhishu Zheng, Zaiping Jiang, Dikai Hu, Cong Beijing Institute of Precise Mechatronics and controls Beijing China Innovation Center for Control Actuators Beijing China

The optimal current control strategy for starting phase of five-phase motors is investigated in view of the short time and large load in the starting phase of the launch vehicle's integrated starter and generator system. First, the optimal injection rate of the third harmonic current is analyzed to reduce the phase current amplitude using the third harmonic current. Derivation of current matching relationship for MTPA control strategy in the fundamental space of five-phase motors to reduce phase current amplitude using reluctance torque. After that, the optimal current control strategy for the starting stage of a five-phase motor is proposed to derive the current matching relation that simultaneously utilizes harmonic currents and reluctance torque. Then, the simulation model is constructed and the optimal current control strategy is simulated and verified, and the phase current amplitude of the proposed control strategy is basically consistent with the theoretical value under the same torque. Finally, experimental verification is carried out on the principle prototype, and the phase current amplitude is reduced from 30.5A to 25.8A with the same load torque of 40 N-m, a reduction of 15.41%. The experimental results are basically consistent with the simulation results, verifying that the proposed strategy is effective. © The Institution of Engineering & Technology 2024.

关键词： Starters

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DESIGN OF SPEED CALIBRATION AND ESTIMATION METHOD FOR UAV MEMS GYROSCOPE

DESIGN OF SPEED CALIBRATION AND ESTIMATION METHOD FOR UAV ME...

引用

2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Zhu, Fengqing Zhang, JianGuo Wu, Fei Chen, ChengFeng Li, Dongdong Wang, Xiaoliang Zhang, Chenghao Beijing Institute of Precision Mechatronics and Controls Beijing China Innovation Center for Control Actuators Beijing China

The velocity of UAVs relative to the ground is usually measured using MEMS gyroscopes. In practice, the output speed of MEMS gyroscopes not only includes the true velocity of UAVs, but also includes random white noise and outlier points. Therefore, how to better process the velocity data measured by MEMS gyroscopes, remove white noise and outliers in the data, is of great significance for improving velocity accuracy and providing good data for velocity estimators[l]. Therefore, in order to obtain more accurate speed information, this chapter first performs denoising processing on sensor data based on wavelet transform, analyzes the speed measurement error of MEMS gyroscopes, and then uses adaptive identification methods to correct the installation deviation angle of MEMS gyroscopes[2]. In response to the random error of MEMS gyroscopes, an improved Sage Husa adaptive Kaiman filtering method is used to estimate the true speed of UAVs, thereby obtaining accurate speed information. Simulation experiments have verified that this method has achieved good results. © The Institution of Engineering & Technology 2024.

关键词： Gyroscopes

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A deep reinforcement learning method for multi-heterogeneous robot systems based on global status

A deep reinforcement learning method for multi-heterogeneous...

引用

2023 International Conference on Computer Graphics, Artificial Intelligence, and Data Processing, ICCAID 2023

作者： Chen, Yanjiang Lin, Junqin Yu, Zhiyuan Zheng, Zaiping Fu, ChunYu Huang, Kui Laboratory of Aerospace Servo Actuation and Transmission Beijing Research Institute of Precise Mechatronics and Controls Beijing100000 China

ISBN: (纸本)9781510677685

At present, multi-agent reinforcement learning(MARL) is in the initial stage of development, and research on strongly coupled multi-agent reinforcement learning is not in-depth. We propose a deep reinforcement learning network architecture for multi-heterogeneous robot systems based on a global status simulation platform. This architecture is based on clipped PPO and constructs a strategy model by constructing the full state action space and full action space of multi-heterogeneous robots. We trained and tested the algorithm on a multi-heterogeneous robot simulation platform, and the results showed that the proposed method can effectively target artificially fixed strategies and achieve victory. © 2024 SPIE.

关键词： Network architecture

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A Inverter Dead-time Compensation Method Based on Phase current Polarity Determination and Voltage Partitioning

A Inverter Dead-time Compensation Method Based on Phase curr...

引用

2023 International Conference on Electronic, Electrical and Information Technology, EEIT 2023

作者： Zhao, Xu Xu, Zhenxiang Wang, Shouhao Wu, Hongxing Beijing Institute of Precision Mechatronics and Controls Beijing China School of Electrical Engineering and Automation HIT Harbin China

The introduction of the dead time of the inverter solves the straight-arm conduction problem of the upper and lower power devices of the inverter, but also leads to the deviation of the actual output voltage of the inverter from the given voltage. Dead time increases the harmonic components of phase voltage and phase current, which is also an important factor leading to motor torque ripple. In this paper, the mechanism of the deviation of phase voltage and phase current caused by the dead time of voltage space vector modulation is analyzed, and the effect of dead time on phase voltage and phase current harmonic components is studied. A simple and effective dead time compensation method based on phase voltage division and phase current polarity determination is proposed to directly compensate the dead time. This method can suppress the current harmonic and torque ripple in the running state of the motor, and can greatly simplify the calculation process of the traditional dead time compensation method. Through the system modeling and simulation, it is verified that the method can significantly improve the current waveform distortion, and has good practical value. © Published under licence by IOP Publishing Ltd.

关键词： Harmonic analysis

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Design and Optimization of High Torque Permanent Magnet Vernier Machines with Fault Tolerance 27

Design and Optimization of High Torque Permanent Magnet Vern...

引用

27th International Conference on Electrical Machines and Systems, ICEMS 2024

作者： Li, Yunjiao Fu, Jie Li, Xiaobei Zhao, Jing School of Automation Beijing Institute of Technology Beijing China Beijing Institute of Precision Mechatronics and Controls Beijing China

ISBN: (纸本)9784886864406

Firstly, in order to achieve the goal of improving the torque density and enhancing the fault tolerance of permanent magnet vernier motors (PMVMs), a hybrid stator structure with fault-tolerant teeth is proposed based on the traditional PMVMs. The torque and the Back-EMF of the two motors are compared. The results show that the proposed motor has better electronic performance. Moreover, the effects of main parameters on the torque, torque ripple, and back EMF of the proposed PMVM are studied, and performance optimization designs are carried out on the proposed PMVM. Finally, the impact of different short-circuit turns on PMVM fault tolerance performance is evaluated.. © 2024 The Institute of Electrical Engineers of Japan.

关键词： Permanent magnets

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Fault-tolerant control of space manipulators moving object capture task based on deep reinforcement learning 4

Fault-tolerant control of space manipulators moving object c...

引用

2024 4th International Conference on mechatronics Technology and Aerospace Engineering, ICMTAE 2024

作者： Zhao, Jian Chen, Yanjiang Zhang, Hao Yu, Guangwei Li, Tongtong Beijing Institute of Precision Mechatronics and Controls Beijing100076 China Innovation Center for Control Actuators Beijing100076 China

Space manipulators and ground cooperative manipulators exhibit dynamic differences, including the effects of zero gravity, the lower joint stiffness of space manipulators, their slightly weaker dynamic response characteristics, and the fact that they are often considered to have floating bases. These differences result in higher control difficulty for space manipulators compared to ground manipulators. At the same time, due to the limitations of in-orbit hardware computing power, the recognition cycle of visual positioning algorithms is long, making mobile target grasping one of the most challenging tasks for space manipulators. Joints are the core components of space manipulators. Solving the problem of joint jamming and preventing the normal use of space manipulators can effectively improve the service life and quality of space manipulators in orbit. This paper proposes a deep reinforcement learning-based method for executing mobile target capture tasks when a single joint of a space manipulator becomes stuck and loses one degree of freedom. In a simulation environment, a model of a faulty space manipulator is built. Dynamic characteristics and signal delay conditions that are close to the real state are input to train the mobile target capture task. The obtained model meets the requirements of task implementation in the simulation environment. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Orbits

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Reliability analysis of aerospace planetary roller screw mechanism considering multiple failure modes 7

Reliability analysis of aerospace planetary roller screw mec...

引用

2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Zhang, Ming Fan, Yuanxun Zhang, Changhui Song, Hongzhou Nanjing University of Science and Technology Jiangsu Nanjing China Beijing Institute of Precision Mechatronics and Controls Beijing China

Faults in planetary roller screw mechanisms under typical aerospace operating conditions are usually caused by the combined effects of multiple coupled failure modes. Reliability analysis methods that ignore correlation often lead to significant errors. In this paper, the failure models of the planetary roller screw mechanism under fatigue elastic failure, wear failure, and fracture failure are analyzed based on the stress-strength interference model, and failure functional functions are provided. The improved O. Ditlevsen second-order reliability bound theory is used to characterize the relationships between multiple failure modes. Using this method, reliability analysis and calculation of planetary roller screw pairs considering multiple failure modes have been performed, verifying the rationality and effectiveness of this method. © Published under licence by IOP Publishing Ltd.

关键词： Reliability analysis

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Analysis of servo valve armature component pressing process

Analysis of servo valve armature component pressing process

引用

2024 CSAA/IET International Conference on Aircraft Utility Systems, AUS 2024

作者： Ying, Pan Libo, Qiu Na, Hu Jing, Li Liran, Li Qing, Tian Beijing Research Institute of Precise Mechatronics and Controls Beijing China Innovation Center for Control Actuators Beijing China

ISBN: (数字)9781837242108

To comprehend the dependability of the interference connection in the armature assembly and the rationale behind the loosening of the armature assembly during usage, this study further delves into the stress and deformation of armature assembly during processing. Drawing upon the theory of thick-walled cylinder and employing the finite element simulation technique, the contact stress and pressing force of armature assembly are calculated and analyzed, respectively. By contrasting the outcomes of the two calculation methods, it is observed that: for interference connections within the elastic limit, the simulation results align closely with the theoretical calculation results. However, for interference connections with stress concentration and lying outside the elastic limit, the finite element method proves to be more practical. The simulation findings also indicated that the contact stress of the interference connection between the armature and the spring tube escalated subsequent to the installation of the feedback rod, surpassing the yield strength of the armature material and leading to plastic deformation. This, in turn, undermines the reliability of the interference connection between the armature and the spring tube. The insights gained from this study hold significant implications for the reliability optimization design of the subsequent armature module. © The Institution of Engineering & Technology 2024.

关键词： Stress analysis

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