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International Conference on Information and automation (ICIA)

作者： Xiaozhou Zhu Xin Song Xiaoqian Chen Huimin Lu College of Aerospace Science and Engineering National University of Defense Technology Changsha Hunan Province China College of Mechatronics and Automation National University of Defense Technology Changsha Hunan Province China

On orbit flying spacecraft detection in near range is of great significance to space based surveillance and the final stage of rendezvous & docking. In this paper, we propose an effective flying spacecraft detection algorithm with the earth as the cluttered dynamic background based on superpixels clustering. Labeled point trajectories are used as the motion cue, and both color and texture features are extracted from generated superpixels for clustering. Experimental results show that our proposed method performs well on real world videos recorded by cameras onboard the International Space Station.

关键词： Feature extraction Space vehicles Trajectory Image color analysis Motion segmentation Earth Cameras

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A Prognostic Framework Based on Factorial Hidden Markov Model

A Prognostic Framework Based on Factorial Hidden Markov Mode...

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IEEE International Conference on Cyber Technology in automation, Control, and Intelligent Systems

作者： Wei Zhang Shigang Zhang Lijun Song Zheng Hu Wuhan Second Ship Design and Research Institute Laboratory of Science and Technology on Integrated Logistics Support College of Mechatronics Engineering and Automation National University of Defense Technology

ISBN: (纸本)9781479987313

In this paper, a system level fault diagnosis and prognosis framework is proposed. Test delay and prognostic dependency relationship are considered in a model based on Factorial Hidden Markov Model. By using time change, the inference problem can be transformed into a known one and thus can be solved using the previous algorithms. The proposed model and algorithm are tested on a simulated model, which shows that they have the potential to be applied to fault diagnosis and prognosis.

关键词： Fault diagnosis Prognosis Markov model PHM Fault diagnosis PAM gene Prognosis Markov models Prognostic

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The research on interior permanent magnetic synchronous motor MTPA control

The research on interior permanent magnetic synchronous moto...

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International Conference on Machine Tool Technology and mechatronics engineering, ICMTTME 2014

作者： Zhang, Bo Ze Ruan, Yi College of Mechatronics Engineering and Automation Shanghai University Shanghai China

ISBN: (纸本)9783038352464

The research on maximum-torque-per-ampere(MTPA) control of Interior Permanent Magnetic Synchronous Motor(IPMSM) is presented in this paper. Based on the IPMSM mathematical model in d-q reference frame, the equations of d, q axis currents and magnetic torque were derived by using extreme value principle. Thus, this algorithm realizes the IPMSM MTPA control. Under the condition of same magnetic torque, the IPMSM MTPA control can minimize the input current magnitude, decrease the IPMSM power loss and the inverter capacity, increase the system efficiency and improve the dynamic performance of system. At last, the paper built simulation model and verified the MTPA algorithm above is correct. © (2014) Trans Tech Publications, Switzerland.

关键词： Synchronous motors

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On bistability in genetic double-negative feedback loop with positive autoregulations 33

On bistability in genetic double-negative feedback loop with...

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第三十三届中国控制会议

作者： LING Guang HE Ding-Xin GUAN Zhi-Hong ZHANG Xian-He ZHAN Xi-Sheng College of Automation Huazhong University of Science and Technology College of Mechatronics and Control Engineering Hubei Normal University

ISBN: (纸本)9781479947249

This paper focuses on bistability in a class of simplified double-negative feedback loop with positive autoregulations(DNFLPAs). The existence criteria of multiple equilibriums is established and the stability conditions are derived for each equilibrium. The effect of each biochemical parameters on bistability is explained. At last, several numerical simulations are carried out to deepen our analysis.

关键词： Multistability,Double-negative feedback loop,Positive autoregulation,Genetic Regulatory Networks.

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Research of the optimal algorithm in the intelligent materials

Communications in Computer and Information Science

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Communications in Computer and Information Science 2014年 463卷 240-249页

作者： Jiang, Enyu Zhu, Xiaojin Gao, Zhiyan Deng, Weihua College of Electrical Engineering Shanghai University of Electric Power Shanghai200090 China School of Mechatronics Engineering and Automation Shanghai University Shanghai200072 China

ISBN: (纸本)9783662452851

Adopting piezoelectric material as sensors and actuators, active vibration control of a cantilever beam is studied in this paper based on Linear Quadratic Regulator (LQR). Firstly, the actuator equation, sensor equation, and the vibration equation is constructed, and then the vibration equation is converted to modal state equation using modal analysis method. Secondly, the optimal control law is given by LQR method, with the detailed control flow. Finally, the active vibration control simulation is done for the vibration suppression of a piezoelectric beam. The results show that the control performance for the step response of the first and second vibration modal is good, as well as the coupled modal of the first two modal. And the effectiveness of the proposed LQR method is verified. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Piezoelectric materials

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An Investigation and Review into Microwave Thermography for NDT and SHM

An Investigation and Review into Microwave Thermography for ...

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2015 IEEE Far East Forum on Nondestructive Evaluation/Testing:New Technology & Application(IEEE FENDT 2015)

作者： Ruizhen YANG Hong ZHANG Teng LI Yunze HE Department of civil and architecture engineering Changsha University School of Electronic and Information Engineering Fuqing Branch of Fujian Normal University School of Electrical Engineering Beijing Jiaotong University College of Mechatronics engineering and automation National University of Defense Technology

Infrared(IR) thermography is a fast-growing Nondestructive Testing(NDT) technique. Various sources can be used as the thermal stimulation, such as flash lamps, laser, ultrasound, and eddy current etc. Currently, various quantification methods for defect depth estimation are built based on the surface heating, heat conduction or thermal wave diffusion. Microwave heating is a new heating technique, which has a lot of advantages, such as strong penetrability, selective heating, volumetric heating, significant energy savings, uniform heating, and good thermal efficiency. In this work, the basic principle of microwave thermography(MWT) is introduced. The developments and case studies of microwave thermography are reviewed.

关键词： infrared thermography microwave thermography volumtric heating composites

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Executable Knowledge Unit for Product Design Service

Executable Knowledge Unit for Product Design Service

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2nd International Conference on Simulation and Modeling Methodologies,Technologies and Applications(SMTA 2015)

作者： Xiaoguang Liu Baozhong Wu Meng Zhang Feng Zou Yuehui Yan College of Mechatronics Engineering and Automation National University of Defense Technology China National South Aviation Industry Co. Ltd. Beijing Institute of Space Long March Vehicle

To meet the rapid development of product design services and quickly reuse design knowledge which is accumulated in product design process, this paper presents the concept of an executable knowledge unit. In addition, its construction and running processes were further studied. Executable knowledge unit has functional independence, high cohesion and loose coupling characteristics. The paper uses object-oriented design methods and parametric design ideas to study executable knowledge units. Meanwhile, the paper also constructs executable knowledge unit model and establish product design process based on executable knowledge unit.

关键词： Executable Knowledge Unit for Product Design Service

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A Simulation System Based on ROS and Gazebo for RoboCup Middle Size League

A Simulation System Based on ROS and Gazebo for RoboCup Midd...

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IEEE International Conference on Robotics and Biomimetics

作者： Weijia Yao Wei Dai Junhao Xiao Huimin Lu Zhiqiang Zheng College of Mechatronics Engineering and Automation National University of Defense Technology China

ISBN: (纸本)9781467396769

Originated from Robot World Cup Middle Size League (RoboCup MSL), this paper discusses the design and implementation of a robot soccer simulation system based on ROS and Gazebo. Its aim is to test multi-robot collaboration algorithms. After building the Gazebo models, a model plugin is written to realize the robot's basic motions including omnidirectional locomotion, ball-dribbling and ball-kicking. To integrate the model plugin with the real robot code, ROS nodes related to low-level controllers are replaced with the model plugin. In addition, nodes related to behavior control and global information processing are modified to corresponding model plugins as well. Finally, multiple robot models are spawned into a simulation world and collaborate with others. We have already used the simulation system to successfully test and debug the multi-robot collaboration algorithms for MSL. Furthermore, after minor modifications, it can also be applied to the research of other multi-robot systems. Therefore, the simulation system is sufficient in simulating multi-robot collaboration.

关键词： simulation system robot soccer multi-robot Gazebo ROS RoboCup

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Strategy and loading-test of servo electro-hydraulic fatigue testing machine based on XPC system

Communications in Computer and Information Science

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Communications in Computer and Information Science 2014年 463卷 198-207页

作者： Miao, Zhonghua Hu, Xiaodong Li, Chuang Lu, Mingchao Han, Keli Department of Automation College of Mechatronics Engineering and Automation Shanghai University China Shanghai Key Laboratory of Power Station Automation Technology Shanghai200072 China Chinese Academy of Agricultural Mechanization Sciences Beijing100083 China

ISBN: (纸本)9783662452851

Fatigue testing plays a more and more important role in modern industry. In order to obtain the general features and the optimal algorithms of closed-loop control systems of the electro-hydraulic fatigue testing machines, a mathematical model of servo electro-hydraulic fatigue testing machine based on xPC real-time control system is developed and simulated in Simulink. In this model, the compound control system with feed-forward (speed feed-forward and acceleration feed-forward) is introduced. And then the static and dynamic loading testing for both position and force control are done to get the control laws and strategies. The research and results not only reveal the control laws and suitable control strategies of the fatigue-testing machine but also prove that the system has high control accuracy, fast signal processing and response ability. It can also realize the position and force control of the fatigue testing machines perfectly. © Springer-Verlag Berlin Heidelberg 2014.

关键词： Closed loop control systems

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Particle filter based scale adaptive compressive tracking

Particle filter based scale adaptive compressive tracking

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Australian Control Conference (AUCC)

作者： Qinghua Yu Jie Liang Dan Xiong Zhiqiang Zheng College of Mechatronics and Automation National University of Defense Technology Changsha China Research School of Engineering Australian National University Canberra Australia National University of Defense Technology Changsha Hunan CN

Compressive Tracking is a very popular vision tracking method based on Compressive Sensing theory. In the Compressive Tracking, the measurement matrix is used to transform the image patch to a feature vector and plays a fundamental role in the tracking procedure. However, based on our analysis the traditional way of constructing the measurement matrix has intrinsic problems. In this paper, we propose a loop-blocked matrix which can extract more complete and discriminative information than the original one. In order to make our method robust to scale variation, a scale adaptive window model is also developed and its parameters are estimated by the particle filter. Regarding to the issue of occlusion, a forgetting model is proposed to improve the tracking robustness, especially when complete occlusion happens or the occlusion lasts too long. Experiments show that our algorithm has good adaption to the scale changes of the target in the image and good robustness to occlusion.

关键词： Target tracking Kernel Image coding Adaptation models Atmospheric measurements Particle measurements

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