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Refined modeling and experimental verification of a torque motor for an electro-hydraulic servo valve

Chinese Journal of Aeronautics 2023年第6期36卷 302-317页

作者： Zhichuang CHEN Shenghong GE Yulei JIANG Wenhao CHENG Yuchuan ZHU National Key Laboratory of Science and Technology on Helicopter Transmission Nanjing University of Aeronautics and AstronauticsNanjing 210016China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration Nanjing Engineering Institute of Aircraft SystemsNanjing 210061China AVIC Nanjing Servo Control System Co. LtdNanjing 210032China

The Permanent Magnet Torque Motor(PMTM)is the key electro-mechanical conversion device in an Electro-Hydraulic Servo Valve(EHSV).In this work,a refined model of a PMTM is developed,considering the non-working air-gaps between the upper or lower yoke and the armature,the fringing effect at the limiting holes,and the nonlinear permeability of soft magnetic *** on the refined model,the influences of various factors on the calculation accuracy of the magnetic flux at the pole surfaces of the armature and the output torque are *** verifying the validity of the refined model,a Finite Element Analysis(FEA)of the PMTM is conducted,and a test platform is *** with existing models,the refined model can better reveal the intrinsic mechanism of the PMTM,and its calculations are more consistent with the FEA *** experimental results of the armature deflection displacement show that the refined model can accurately describe the output characteristics of the PMTM.

关键词： Calculation accuracy Electro-hydraulic servo valve Experimental verification Finite element analysis Refined model Torque motor

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Design and Control of a Coupling Mechanism-Based Prosthetic Hand

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Journal of Shanghai Jiaotong university(science) 2010年第5期15卷 571-577页

作者：王新庆刘伊威姜力杨大鹏李楠刘宏黄海 State Key Laboratory of Robotics and System Harbin Institute of Technology Institute of Robotics and Mechatronics German Aerospace Center Key Laboratory of Science and Technology for National Defence of Autonomous Underwater Vehicle Harbin Engineering University

A five-fingered,multi-sensory and biomimetic hand is *** cambered palm is specially designed by utilizing the knowledge of *** position of each finger is arranged according to human hand *** finger with three phalanges could fulfill flexion-extension movement *** the fingers are designed using coupling link *** location of the thumb is designed by maximizing interaction area between the thumb and other *** opposite thumb could grasp along a cone surface,while maintaining its *** hardware architecture is divided into control system and human-machine interaction *** mechanical parts,sensors and motion control systems are integrated in the hand *** addition,a skin-like glove is designed,which makes the hand more *** to our primary experimental results,the hand can accomplish several grasp modes by applying an intuitive surface electromyography control *** success rate of 10 modes is up to 90%.

关键词： prosthetic hand coupling mechanism electromyography control support vector machine (SVM)

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Detecting abnormal activities in video surveillance with multi-models

Detecting abnormal activities in video surveillance with mul...

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5th International Conference on Visual Information Engineering, VIE 2008

作者： Li, Xiu-Xiu Zheng, Jiang-Bin Wu, Jian-Min Huo, Guo-Feng School of Computer Northwestern Polytechnical University Xi'an Shaanxi China National Defense Science and Technology Key Laboratory for Avionics System Integration Technology China National Aeronautical Radio Electronics Research Institute China

ISBN: (纸本)9780863419140

In this paper, an adaptive method for detecting abnormal activities in video surveillance is proposed. In this method, a multi-Gaussian distribution called activity model is used to model a moving object activities. The activity model parameters are updated to satisfy the object motion attributes in a real-time when every new frame comes, and at same time this moving object current activity can be recognized by means of its possibility in the activity model. The advantage of this method is that the proposed activity models can update itself adaptively to match the current motion style of the object. The models are robust to the light change in the style of the object activity, and they are sensitive to these activities that do not meet the models. Several experiments are given to show that the proposed method is efficient. ©2008 The Institution of Engineering and technology.

关键词： Gaussian distribution

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Dynamic temperature prediction of electronic equipment under high altitude long endurance conditions

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Chinese Journal of Aeronautics 2018年第6期31卷 1189-1197页

作者： Liping PANG Miao ZHAO Kun LUO Yongli YIN Zhou YUE School of Aeronautic Science and Engineering Beihang University Beijing 100083 China National Key Laboratory of Human Factors Engineering China Astronaut Research and Training Center Beijing 100094 China Aviation Key Laboratory of Science and Technology on Aero Electromechanical System Integration. Nanjing 211102 China

Unmanned Aerial Vehicle（UAV） is developing towards the direction of High Altitude Long Endurance（HALE）. This will have an important influence on the stability of its airborne electronic equipment using passive thermal management. In this paper, a multi-node transient thermal model for airborne electronic equipment is set up based on the thermal network method to predict their dynamic temperature responses under high altitude and long flight time conditions. Some relevant factors are considered into this temperature prediction model including flight environment,radiation, convection, heat conduction, etc. An experimental chamber simulating a high altitude flight environment was set up to survey the dynamic thermal responses of airborne electronic equipment in a UAV. According to the experimental measurement results, the multi-node transient thermal model is verified without consideration of the effects of flight speed. Then, a modified way about outside flight speed is added into the model to improve the temperature prediction performance. Finally, the corresponding simulation code is developed based on the proposed model. It can realize the dynamic temperature prediction of airborne electronic equipment under HALE conditions.

关键词： Airborne electronic equipment High altitude long endurance Multi-node transient thermal model Node thermal network Temperature prediction

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Quantized innovations Kalman filter: stability and modification with scaling quantization

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Journal of Zhejiang University-science C(Computers and Electronics) 2012年第2期13卷 118-130页

作者： Jian XU Jian-xun LI Sheng XU Science and Technology on Avionics Integration Laboratory Shanghai Jiao Tong UniversityShanghai 200240 MOE Key Laboratory of System Control and Information Processing Shanghai Jiao Tong UniversityShanghai 200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The stability of quantized innovations Kalman filtering (QIKF) is analyzed. In the analysis, the correlation between quantization errors and measurement noises is considered. By taking the quantization errors as a random perturbation in the observation system, the QIKF for the original system is equivalent to a Kalman-like filtering for the equivalent state-observation system. Thus, the estimate error covariance matrix of QIKF can be more exactly analyzed. The boundedness of the estimate error covariance matrix of QIKF is obtained under some weak conditions. The design of the number of quantized levels is discussed to guarantee the stability of QIKF. To overcome the instability and divergence of QIKF when the number of quantization levels is small, we propose a Kalman filter using scaling quantized innovations. Numerical simulations show the validity of the theorems and algorithms.

关键词： Kalman filtering Quantized innovation Stability Scaling quantization Wireless sensor network

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An Assumption of R&D Method Driven by Model and Data 1

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14th International Conference on Complex systems Design and Management, CSD and M 2023

作者： Song, Wenming Li, Kui National Key Laboratory of Science and Technology on Avionics Integration Shanghai China China Aeronautical Radio Electronics Research Institute Shanghai200233 China

ISBN: (数字)9789819965113

ISBN: (纸本)9789819965106

The model-based systems engineering is gradually applied to the development of complex systems, it has the advantages of accurate transmission of design output, rapid response to design changes, and undemanding reuse of design achievements. In this paper, MBSE is evaluated from three perspectives, including the theoretical system of model-driven research and development (R&D), the requirements of product R&D as well as the requirements of complex system R&D, and the shortcomings of MBSE are sorted out. On this basis, this paper proposes the R&D process of complex system hybrid-driven by model and data, and analyzes the key technologies to be solved. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Digital devices

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Stability Analysis of Service-oriented Advanced avionics system based on Evolutionary Game

Stability Analysis of Service-oriented Advanced Avionics Sys...

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2021 China Automation Congress, CAC 2021

作者： Liu, Zhaohui Wang, Zhongjie Liu, Qingchun Li, Bingfei National Key Laboratory of Science and Technology Avionics System Integration China National Aeronautical Radio Electronic Research Institute Shanghai China College of Electronics and Information Engineering Tongji University Shanghai China

ISBN: (纸本)9781665426473

Service-oriented advanced avionics system could implement system integration and information sharing by servicizing resources with multi-participant. In this system, each participant is bounded rational and may take aberrant behaviors. Different participant behaviors will cause the system to evolve towards different directions. In this paper, the evolution of service-oriented advanced avionics system is studied from the perspective of service management. A tripartite asymmetric game model is established to describe the participant behaviors. The replicated dynamic equation is applied to analyze the system stability. The sufficient condition of system stability is given. The research work contributes to predicting and controlling the evolution of this system accurately. The simulation results indicate that the game model and analysis method are correct and practical. © 2021 IEEE

关键词： system stability

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Bisimulations for open processes in higher order π-calculus

Bisimulations for open processes in higher order π-calculus

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2010 4th International Symposium on Theoretical Aspects of Software Engineering, TASE 2010

作者： Cao, Zining Department of Computer Science and Technology Nanjing University of Aero. and Astro. Nanjing 210016 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China National Key Laboratory of Science and Technology on Avionics System Integration Shanghai 200233 China

ISBN: (纸本)9780769541488

In this paper, we propose open bisimulations for open processes in higher order π-calculus. The equivalence of open bisimulations and other bisimulations for open processes is proved. Furthermore, we present a symbolic operational semantics of higher order open processes, and give some symbolic bisimulations for higher order processes. The relation between symbolic bisimulations and other bisimulations is also studied. At last, we introduce a higher order π-calculus with sum and conditional operators, then we study open bisimulations and symbolic bisimulations for this calculus. © 2010 IEEE.

关键词： Calculations

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Extending interface automata with Z notation

Extending interface automata with Z notation

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4th IPM International Conference on Fundamentals of Software Engineering, FSEN 2011

作者： Cao, Zining Wang, Hui National Key Laboratory of Science and Technology on Avionics System Integration Shanghai 200233 China Department of Computer Science and Technology Nanjing University of Aero. and Astro. Nanjing 210016 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China

In this paper, we propose a specification approach combining interface automata and Z language. This approach can be used to describe behavioural properties and data properties of software components. We also study th... 详细信息

ISBN: (纸本)9783642293191

关键词： Automata theory

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Temporal logics and model checking algorithms for ZIAs

Temporal logics and model checking algorithms for ZIAs

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2nd International Conference on Software Engineering and Data Mining, SEDM 2010

作者： Cao, Zining National Key Laboratory of Science and Technology on Avionics System Integration Shanghai 200233 China Department of Computer Science and Technology Nanjing University of Aero. and Astro. Nanjing 210016 China Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou 215006 China

ISBN: (纸本)9788988678213

In this paper, we first propose a specification approach combining interface automata and Z language. This approach can be used to describe temporal properties and data properties of software components. A branching time logic for ZIAs is presented. We then give an algorithm for model checking this logic on ZIAs with finite domain. Furthermore, we present a mu-calculus logic for ZIAs, and give a model checking algorithm for this logic.

关键词： Model checking

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