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The High-Speed Data Acquisition System Based on LVDS Interface and Two-Plane Flash-Operating Way

The High-Speed Data Acquisition System Based on LVDS Interfa...

2011 2nd IEEE International Conference on Software Engineering and Service science(2011年第二届 IEEE 软件工程与服务科学国际会议 ICSESS 2011)

作者： Xianmin Bai Jianhua Zhan Wenyi Liu Yating Zhang Huilian Han National Key Laboratory of Electronic Measurement Technology North University of China Taiyuan Chin National Key Laboratory of Science and Technology on Aerospace Intelligence Control Space-Flight and

In the aerospace engineering, before the rocket launch, we need to simulate the actual process to collect and store data. This article describes a high-speed data acquisition and storage systems based on the LVDS interface and two-plane flash-operating way. When receiving the simulated rocket ignition signal, the recorder assembled in the rocket records the sensor parameters of various key parts of the rocket high-speedly in the two-plane way;the control center, via the LVDS interface and the USB bus of the integrated test bench, monitors the state parameters in real time.

关键词： LVDS interface two-plane high-speed access

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control capability analysis for complex spacecraft thruster configurations

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science China(Technological sciences) 2010年第8期53卷 2089-2096页

作者： WANG Min XIE YongChun Beijing Institute of Control Engineering Beijing 100190China National Key Laboratory of Science and Technology on Space Intelligent Control Beijing 100190China

The set of forces and moments that can be generated by thrusters of a spacecraft is called the"control capability"with respect to the thruster *** the control capability of a thruster configuration is adequate to fulfill a given space mission,we say this configuration is a feasible one with respect to the *** study proposed a new way to analyze the control capability of the complex thruster *** mathematical definitions of feasibility were proposed,based on which a criterion to judge the feasibility of the thruster configuration was presented through calculating the shortest distance to the boundary of the controllable region as a function of the thruster ***,control capability analysis for the complex thruster configuration based on its feasibility with respect to the space mission was given followed by a 2-D thruster configuration example to demonstrate its validity.

关键词： thruster configuration control capability

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Robust actuator fault diagnosis and tolerant control for satellite attitude control systems

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ICIC Express Letters 2011年第4 A期5卷 911-918页

作者： Cheng, Yuehua Jiang, Bin Sun, Jun Fu, Yanping Gao, Zhifeng College of Automation Engineering Nanjing University of Aeronautics and Astronautics No. 29 Yudao Street Nanjing 210016 China Academy of Frontier Science Nanjing University of Aeronautics and Astronautics No. 29 Yudao Street Nanjing 210016 China Shanghai Aerospace Control Engineering Institute Shanghai 200233 China Shanghai Key Laboratory of Space Intelligent Control Technology Shanghai 200233 China

This paper is concerned with the design of a robust actuator fault diagnosis and tolerant control scheme for satellite attitude control systems. A bank of sliding mode observers (SMOs) are firstly investigated to detect and isolate single actuator fault for satellite attitude control systems with input disturbance. When an actuator undergoes unknown fault, it is disabled. Under such condition, a novel fault tolerant controller based on sliding mode control method is proposed to keep system safe using the remaining actuators. Simulation results demonstrate the effectiveness of the proposed method for satellite attitude control systems. © 2011 ISSN 1881-803X.

关键词： Failure analysis

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On the placement of actuators and sensors for flexible structures with closely spaced modes

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science China(Technological sciences) 2010年第7期53卷 1973-1982页

作者： LIU XiaoXiang1,2 & HU Jun1,2 1 Beijing Institute of control Engineering, Beijing 100190, China 2 State key laboratory of science and technology on space intelligent control, Beijing 100190, China 1. Beijing Institute of Control Engineering Beijing 100190 China2. State Key Laboratory of Science and Technology on Space Intelligent Control Beijing 100190 China

This paper analyzed the fundamental limitations of previous work and developed a new method to optimally locate actuators and sensors for structures with close modes. Optimization criteria were defined based on the distinguishing modal controllability and observability measures of close modes. An appropriate genetic algorism was adopted as the optimization algorism. Solving the high order Lyapunov functions was avoided by means of the closed-form expressions for controllability and observability Grammians. Since structure with widely separated natural frequencies is approximately balanced, computational efficiency was improved by grouping close modes together and dealing with the resulting subsystems independently. Finally, the effectiveness and optimality of the novel placement scheme were verified on a model structure with close modes.

关键词： close modes controllability/observability sensor/actuator optimization criterion optimization algorithm

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Systematic error analysis and compensation for high accuracy star centroid estimation of star tracker

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science China(Technological sciences) 2010年第11期53卷 3145-3152页

作者： JIA Hui YANG JianKun LI XiuJian YANG JunCai YANG MengFei LIU YiWu HAO YunCai Institute of Technique Physics Science CollegeNational University of Defense TechnologyChangsha 410037China Beijing Institute of Control Engineering National Laboratory of Space Intelligent ControlBeijing 100190China China Academy of Space Technology Beijing 100094China

Subpixel centroid estimation is the most important star image location method of star tracker. This paper presents a theoretical analysis of the systematic error of subpixel centroid estimation algorithm utilizing frequency domain analysis under the con-sideration of sampling frequency limitation and sampling window limitation. Explicit expression of systematic error of cen-troid estimation is obtained, and the dependence of systematic error on Gaussian width of star image, actual star centroid loca-tion and the number of sampling pixels is derived. A systematic error compensation algorithm for star centroid estimation is proposed based on the result of theoretical analysis. Simulation results show that after compensation, the residual systematic errors of 3-pixel-and 5-pixel-windows’ centroid estimation are less than 2×10-3 pixels and 2×10-4 pixels respectively.

关键词： star tracker star image location subpixel centroid estimation centroid algorithm frequency domain analysis systematic error compensation

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On the recursive implementation of adaptive control for robot manipulators

On the recursive implementation of adaptive control for robo...

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作者： Wang, Hanlei National Key Laboratory of Science and Technology on Space Intelligent Control Beijing Institute of Control Engineering Beijing 100190 China

ISBN: (纸本)9787894631046

This paper investigates the recursive implementation of adaptive control for robot manipulators. Using the spatial vector tool and exploiting some physical properties of multi-body systems, we propose a general framework on the seeking of the Coriolis and centripetal matrix which satisfies the so-called skew-symmetric requirement. Then two existing choices are analyzed and a new kind of Coriolis and centripetal matrix is proposed. Comparisons between these choices show that the simplest-form Coriolis and centripetal matrix comes from the original recursive Newton-Euler dynamics based on spatial vectors, which implies that skew-symmetric property is an inherent property possessed by spatial-vector based recursive Newton-Euler dynamics formulation. Under the proposed general framework regarding establishment of the Coriolis and centripetal matrix, a class of recursive passivity based adaptive algorithms have been proposed. In the next, we present an algorithm on how to derive the filtered manipulator torque recursively. With this filtered torque, the prediction error of the filtered torque is obtained and injected to the direct adaptation, forming the well-known composite adaptation law. Composite adaptation driven by both the tracking errors and the prediction errors gives more smooth tracking error response and estimated parameter response, and also better tracking accuracy. A six-DOF manipulator is employed as a simulation example to show the performance of the proposed recursive algorithms.

关键词： Adaptive algorithms

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An innovative navigation scheme for high precision landing on Mars

An innovative navigation scheme for high precision landing o...

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作者： Nie, Qi Gao, Xiaoying National Key Laboratory of Science and Technology on Aerospace Intelligent Control Beijing Aerospace Automatic Control Institute China

ISBN: (纸本)9781617823688

Several international Mars space missions scheduled for the coming decade will require the high precision landing capability, whether for sample acquisition and return or for precise insertion into hazardous but scientifically interesting terrain. Thus, a critical component of the closed-loop guidance, navigation and control (GNC) system required for high precision landing is position and velocity estimation in real time. An innovative navigation scheme for high precision landing on Mars is studied in this paper. Firstly, the descriptions of outline of Martian landing process are provided. Secondly, a GNC system scheme for Martian landing spacecraft is described. Thirdly, the autonomous navigation based on velocity/distance measurements-updated IMU for Martian landing is presented. Fourthly, the Design of the navigation filter for state estimation during Martian landing will be presented using the proposed model. Finally, the presented navigation method is validated by using the simulation and some conclusions are drawn. Copyright © 2010 by the International Astronautical Federation. All rights reserved.

关键词： Landing

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Dynamic modeling and tracking control of fuel filled space robotic system with flexible manipulators

Dynamic modeling and tracking control of fuel filled space r...

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3rd International Symposium on Systems and control in Aeronautics and Astronautics, ISSCAA2010

作者： Yang, Xinxin Luo, Xiong Sun, Fuchun Wu, Fengge Liu, Huaping University of Science and Technology Beijing Beijing 100083 China National Laboratory of Space Intelligent Control Beijing 100190 China Department of Computer Science and Technology Tsinghua University Tsinghua National Laboratory for Information Science and Technology Beijing 100084 China

ISBN: (纸本)9781424460441

In recent years, dynamics model and control of space robot system are the hot topics in the research field. In this paper, a new dynamics model and control strategy of space robotic system with a flexible manipulator and a liquid fuel tank are investigated. Based on Lagrange equation method, the dynamics model of the space robotic system coupling with liquid sloshing, flexibility vibration and base movement is derived. The elastic deflection of the flexible manipulator is described by the assumed mode method and equivalent mechanical model is adopted instead of liquid sloshing under the environment of low-gravity. The inverse dynamics control algorithm combined with PD control method is performed to solve the trajectory tracking problem. Some simulation results are given to verify the effectiveness of the proposed method. ©2010 IEEE.

关键词： Dynamics

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Universal approximation of TS fuzzy systems constructed dynamically-MISO cases

Universal approximation of TS fuzzy systems constructed dyna...

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作者： Yan, ShiYu Sun, ZengQi Li, Zhe Department of Computer Science and Technology State Key Laboratory on Intelligent Technology and Systems Tsinghua University Beijing 100084 China National Laboratory of Space Intelligent Control Beijing 100190 China Central University of Finance and Economics Beijing 100081 China

ISBN: (纸本)9781424474264

Study on approximation capabilities of fuzzy systems has been an important and hot issue for many years. Many existing studies on fuzzy systems based on standard affine TS fuzzy models suffer seriously from curse of dimensionality though such models are relatively simple to construct;whereas other investigations based on hierarchical fuzzy models have to face the difficulty of relatively more complexity. Through utilizing the dynamic partition along all dimensions, this paper proposes a novel dynamically constructive method in MISO cases to construct fuzzy systems based on standard affine TS fuzzy models, which have simple structures and also can ease the serious curse of dimensionality greatly. Correspondingly, new sufficient conditions for a affine TS fuzzy system as an universal approximator are obtained. The situation in 2ISO cases is derived first which is then extended to general MISO cases. Theoretical analyses comparing to some typical methods and several numerical examples all confirm that the dynamic method in this paper can reduce the fuzzy rules number dramatically and therefore can ease the serious curse of dimensionality to some extent. Some conclusions and discussions on further work are also given. © 2010 AACC.

关键词： Fuzzy systems

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Robust fault detection filter and its application in MEMS-based INS/GPS

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Journal of Systems Engineering and Electronics 2011年第1期000卷

作者： Jing Shi Lingjuan Miao Maolin Ni Jing Shi Lingjuan Miao(Institute of Automation Beijing Institute of Technology Beijing 100081 P. R. China) Maolin Ni(National Key Laboratory of Science and Technology on Space Intelligent Control Beijing Institute of Control Engineering Beijing 100190 P. R. China)

Since any disturbance and fault may lead to significant performance degradation in practical dynamical systems, it is essential for a system to be robust to disturbances but sensitive to faults. For this purpose, this paper proposes a robust fault-detection filter for linear discrete time-varying systems. The algorithm uses H∞ estimator to minimize the worst possible amplification from disturbances to estimate errors, and H- index to maximize the minimum effect of faults on the residual output of the filter. This approach is applied to the MEMS-based INS/GPS. And simulation results show that the new algorithm can reduce the effect of unknown disturbances and has a high sensitivity to faults.

关键词： integrated navigation inertial navigation system (INS) micro electro mechanical system (MEMS) fault detection robustness

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