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Study on Dry Electrical Discharge Assisted Grinding of SiCp/Al Composite

Chinese Journal of Mechanical Engineering 2025年第1期38卷 106-118页

作者： Yanjun Lu Yuming Huang Xiaobu Liu Rong Cheng Shunda Zhan Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China School of Intelligent Manufacturing and Equipment Shenzhen Institute of Information TechnologyShenzhen 518172China

SiC-reinforced aluminum matrix(SiCp/Al)composite is widely utilized in the aerospace,automotive,and electronics industries due to the combination of ceramic hardness and metal ***,the significant disparity in properties between SiC particles and the aluminum matrix results in severe tool wear and diminished surface quality during conventional *** study proposes an environmentally friendly and clean dry electrical discharge assisted grinding process as an efficient and low-damage machining method for SiCp/*** experimental platform was set up to study the impact of grinding and discharge process parameters on surface *** study compared the chip formation mechanism and surface quality between dry electrical discharge assisted grinding and conventional grinding,revealing relationships between surface roughness,grinding force,grinding temperature,and related *** results indicate that the proposed grinding method leads to smaller chip sizes,lower grinding forces and temperatures,and an average reduction of 19.2%in surface roughness compared to conventional *** axial,tangential,and normal grinding forces were reduced by roughly 10.5%,37.8%,and 23.0%,*** optimized process parameters were determined to be N=2500 r/min,vf=30 mm/min,a=10μm,E=15 V,f=5000 Hz,dc=80%,resulting in a surface roughness of 0.161μm.

关键词： Dry electrical discharge assisted grinding SiCp/Al composite Surface quality Grinding force Grinding temperature

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Design and implementation of intelligent equipment early warning system 9

Design and implementation of intelligent equipment early war...

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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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DESIGN OF SPEED CALIBRATION AND ESTIMATION METHOD FOR UAV MEMS GYROSCOPE

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

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

OPTIMIZATION OF DYNAMIC CHARACTERISTICS ON THE REDUNDANT ELE...

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

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

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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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On high-performance rotational energy harvesting with a novel cam-like dielectric elastomer generator

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Science China(Technological Sciences) 2023年第5期66卷 1317-1334页

作者： FANG ShiTong WANG ShuaiBo ZHANG GuoQing WANG Chen XU JunChen WANG ZhouZhou FENG AiJie QIAO ZiJian YURCHENKO Daniil LAI ZhiHui Shenzhen Key Laboratory of High-Performance Nontraditional Manufacturing College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China Guangdong Key Laboratory of Electromagnetic Control and Intelligent Robots College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen518060China School of Mechanical Engineering and Mechanics Ningbo UniversityNingbo315211China Institute Sound and Vibration Research University of SouthamptonSouthamptonSO171BJUK

Rotational energy is a type of common energy source that can be harvested for supplying low-powered electronic *** paper proposes and investigates a novel cam-like dielectric elastomer generator(CDEG)for high-performance rotational energy harvesting.A mushroom-head clamp is designed to form a type of advanced conical dielectric elastomer membranes(DEMs).Moreover,a type of multi-protrusion cam mechanism is designed in the CDEG to effectively convert any external rotational excitation into a linear reciprocating motion,which can be further converted into electricity through the ***,the operating principle of the system under external rotational excitation is analyzed theoretically by deducing the deformation condition of the DEMs and the electrical output of the ***,the prototype is fabricated,and the rotational-to-linear motion conversion rule of its cam-like mechanism and the DEM capacitance calculation approach are *** experimental results show that adequate charging time and discharging time of the DEMs,which can be realized through the proposed cam-like mechanisms,are beneficial to the energy harvesting(EH)performance of the ***,with the validated theoretical model,numerical simulations are conducted to further study the system dynamics and the influences of important system parameters on the EH performance to provide a guideline for system ***,the genetic algorithm is adopted to obtain the optimal system parameters and the corresponding electrical output of the proposed CDEG,demonstrating its superior output power at ultralow rotational frequencies compared with other typical rotational energy harvesters in the literature.

关键词： rotational energy harvesting dielectric elastomer generator cam-like mechanism rotational-to-linear conversion theoretical model

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Analysis of servo valve armature component pressing process

Analysis of servo valve armature component pressing process

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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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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...

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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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Optimization Design and Experimental Study of Space High-precision Gripper 2

Optimization Design and Experimental Study of Space High-pre...

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2022 2nd International Conference on Mechanical, Aerospace, and Automotive Engineering, CMAAE 2022

作者： Duan, Jiaqi Deng, Songbo Zhi, Jiankang Yang, Tao Shi, Yan Zhao, Hongchao Beijing Institute of Precision Mechatronics and Control Laboratory of Aerospace Servo Actuation and Transmission China

To meet the requirements of large tolerance, high precision, soft capture and high reliability of space gripper, a three finger end effector is developed. The gripper adopts a three fingered gripper configuration, which needs to be used together with the corresponding capture adapter. It is characterized by stable grip, high precision, large clamping force, large tolerance and strong correction ability. A 6-DOF microgravity equivalent device is innovatively designed, which adopts the combination of ball bearing and reverse counterweight. In this paper, a ground capture calibration platform is built to fully test the capture accuracy of the gripper. Considering the disturbance of capture load, carrying platform and other factors to capture, the capture stiffness of the gripper is tested and the capture stiffness curve is obtained. Both tests have verified the feasibility and effectiveness of the design. © Published under licence by IOP Publishing Ltd.

关键词： Grippers

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Multimodal modeling and identification study of a quadrotor robot 4

Multimodal modeling and identification study of a quadrotor ...

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2024 4th International Conference on mechatronics, Automation and Intelligent control, MAIC 2024

作者： Wang, Chunyi Liang, Binyan Fu, Tianhua Zheng, Zaiping Beijing Institute of Precision Mechatronics and Controls Beijing100076 China Innovation Center for Control Actuators Beijing100076 China

The flight control system of a flying robot plays a crucial role. Therefore, it is imperative to establish various flight mode control models. Traditional modeling methods face challenges in meeting the demands of rapid research and development due to the emergence of diverse aircraft shapes and load forms. To address these issues, this study focuses on multiconditions modeling and system identification. Based on flight dynamics theory, a comprehensive quadrotor robot dynamics model along with its state space model was established. Flight tests were designed for system identification under different flight modes. The data obtained from the flight test was preprocessed using an extended Kalman filter algorithm based on flight path reconstruction technology to reduce constant deviation from airborne sensors. Frequency response identification technology was employed to identify control models for hovering mode and forward flight at 10m/s mode in the quadrotor robot. Model structures were determined based on precision index evaluation criteria. Time-domain validation method was utilized to simulate fitting error RMS for each channel model under multiple conditions using different signal excitations derived from datasets collected during experiments. The results confirmed that the proposed aircraft system identification method is effective and feasible. © 2024 institute of Physics Publishing. All rights reserved.

关键词： Extended Kalman filters

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