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2011 International Conference on Fluid Power and Mechatronics, FPM 2011

作者： Yao, Chengyu Dang, Zhen Chen, Dongning Lv, Shijun Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9781424484522

In order to overcome the characteristics of uncertainty and incomplete information of fault attribute in searching for fault, a new fault search method based on the fault tree and grey fuzzy multi-attribute decision-making is proposed in this paper. Firstly, utilizing fault tree analysis (FTA) method to determine the initial fault alternative, fault probability and search cost of the fault alternative are considered as fault attributes simultaneously, the attribute value of fault alternative is described as grey fuzzy numbers, calculating the attribute weight by the information entropy method. Then, the grey relational grade between the fault alternative and the ideal alternative is calculated base on grey relational analysis method, and relative closeness of fault alternative is achieved. Finally, according to the relative closeness determine the search order of all fault alternatives. An engineering example of the hydraulic suspension system of a certain type truck is adopted to demonstrate the feasibility and accuracy of the proposed method. © 2011 IEEE.

关键词： Fault tree analysis

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Adaptive Backstepping control for Rotate control of Wind Power with Hydraulic Transmission

Adaptive Backstepping Control for Rotate Control of Wind Pow...

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2011 International Conference on Mechanical engineering and Technology(ICMET 2011)

作者： Hongbin Wang Wenzeng Gao Shaochan Feng Key Lab of Industrial Computer Control Engineering of Heibei Province Yanshan University

For the rotor speed control of the grid-connecting of wind turbines with hydraulic transmission, the system dynamics model is built. To address the difficulty in accurate control of rotor speed for external disturbance and uncertain internal disturbances while connecting to the grid, an adaptive Backstepping controller was designed. The convergence was proved with Lyapunov stability theory. The condition of a constant rotor speed for connecting to grid was meted. The simulation results show that the systerm provides a good dynamic response and strong robustness when system parameters and load torque disturbances appeared.

关键词： Wind turbines,Hydraulic transmission,Rotor speed control,Adaptive Backstepping

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Adaptive position tracking control for electro-hydraulic servo system with input saturation

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ICIC Express Letters 2012年第10期6卷 2699-2704页

作者： Shi, Shengli Fang, Yiming Li, Jianxiong Jiao, Zongxia Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China College of Science Yanshan University No. 438 Hebei Ave. Qinhuangdao 066004 China College of Automation Beijing University of Aeronautics and Astronautics No. 37 Xueyuan Road Haidian Dist. Beijing 100191 China

An adaptive controller is proposed for the position tracking of an electrohydraulic servo system with uncertainties and input saturation. Firstly, fuzzy logic is employed to approximate the unknown nonlinear uncertainties. And a nonlinear tracking controller is developed by combining the adaptive backstepping with H∞ control method. In addition, in order to tackle the input constraint, an auxiliary design system based on Lyapunov method is presented. The proposed controller not only can effectively avoid the problem of input saturation, but also can guarantee that the output tracking error satisfies the H-infinity performance. Finally, the simulation results testify the effectiveness of the proposed method. © 2012 ISSN.

关键词： Tracking (position)

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PSO algorithm based PID parameters optimization of hydraulic screwdown system of cold strip mill

PSO algorithm based PID parameters optimization of hydraulic...

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2011 International Conference on Fluid Power and Mechatronics, FPM 2011

作者： Chen, Dongning Zhang, Guofeng Yao, Chengyu Key Lab of Heavy Machinery Fluid Power Transmission and Control of Hebei Province Yanshan University Qinhuangdao China Key Lab of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao China

ISBN: (纸本)9781424484522

Hydraulic screwdown system of cold strip mill is nonlinear, time-variant system and it is disturbed by many factors, so the turning quality of controller influences the accuracy of Automatic Gauge control (AGC). In this paper an optimum design method based on particle swarm optimization (PSO) algorithm is presented for PID controller parameters optimization of hydraulic servo screwdown system of one cold strip mill. With PSO algorithm it is fast to calculate PID controller parameters through minimizing the fitness function and searching on the given controller parameter space. Simulation shows that the PID controller turned by PSO algorithm can achieve better control performance than Genetic Algorithm (GA) in AGC system of one single stand reversing cold rolling mill. © 2011 IEEE.

关键词： Three term control systems

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Bearing fault diagnosis of a wind turbine using maximum likelihood detection

Bearing fault diagnosis of a wind turbine using maximum like...

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2011 International Conference on Electronic and Mechanical engineering and Information Technology, EMEIT 2011

作者： Yang, Shenggang Li, Xiaoli Liang, Ming Key Lab of Industrial Computer Control Engineering of Hebei Province Institute of Electrical Engineering Yanshan University Qinhuangdao China Department of Mechanical Engineering University of Ottawa 770 King Edward Avenue Ottawa ON Canada

ISBN: (纸本)9781612840857

Bearings are the most frequently used components in a wind turbine. As such, bearing Fault Detection is an imperative part of preventive maintenance procedures of a wind turbine. This paper presents a Maximum likelihood method to implement bearing fault diagnosis. This set extracts the amplitude and frequency modulations of the vibration signals measure from a wind turbine system. As the amplitude demodulation is inherent in this set, the fault frequency can be detected from the spectrum of the transformed signal. The effectiveness of this method has been validated by using simulated signal and experimental data. © 2011 IEEE.

关键词： Wind turbines

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Bearing condition monitoring and fault diagnosis of a wind turbine using parameter free detection

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2011 International Conference on Electric and Electronics, EEIC 2011

作者： Yang, Shenggang Li, Xiaoli Liang, Ming Key Lab. of Industrial Computer Control Engineering of Hebei Province Institute of Electrical Engineering Yanshan University Qinhuangdao 066004 China Department of Mechanical Engineering University of Ottawa 770 King Edward Avenue Ottawa ON Canada

ISBN: (纸本)9783642217616

The most frequently used component of a wind turbine is bearing which failure could lead to malfunction and ultimately complete stall in a mission-critical equipment. Hence, bearing fault detection is an imperative part of preventive maintenance procedures in a wind turbine. This paper presents a free parameter approach to implement bearing condition monitoring and fault diagnosis. This approach extracts the amplitude and frequency modulations of faulty vibration signals that measured from a wind turbine system. The amplitude demodulation is inherent, and the fault frequency will be detected from the spectrums of the signal. The effectiveness of this approach has been validated by using simulated signal and experimental evaluation. © 2011 Springer-Verlag Berlin Heidelberg.

关键词： Fault detection

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Bearing fault detection and diagnosis of a wind turbine

Bearing fault detection and diagnosis of a wind turbine

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International Conference on Consumer Electronics, Communications and Networks

ISBN: (纸本)9781612844572

The most commonly used components in a wind turbine are bearings which failure could lead to malfunction and ultimately complete stall of a mission-critical equipment. Hence, bearing Fault Detection is an imperative part of preventive maintenance procedures of a wind turbine. This paper presents a Free Parameter method to implement bearing fault diagnosis. This method extracts the amplitude and frequency modulations of the vibration signals that measure from a wind turbine system. As the amplitude demodulation is inherent in it, the fault frequency will be detected from the spectrum of the signal. Simulated signal and experimental data has validated the effectiveness of this method. © 2011 IEEE.

关键词： Wind turbines

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虚拟手术中基于凸多边形的软组织切割算法研究

虚拟手术中基于凸多边形的软组织切割算法研究

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第十二届中国虚拟现实大会

作者： WANG Hong-rui 王洪瑞 CHEN Li-min 陈利敏 ZHAO Bing 赵冰 WANG Hong-bin 王洪斌 Key Lab of Industrial Computer Control Engineering of Hebei Province in Yanshan University Qinhuang 燕山大学工业计算机控制工程河北省重点实验室秦皇岛 066004

虚拟手术仿真系统为医学教学提供了一种方便、廉价、有效的方法。切割模拟是该系统重要组成部分，影响整个系统的实时性和真实性，因此对整个切割过程进行深入研究并提出了基于凸多边形的切割算法。首先通过遍历优化索引结构后的八叉树... 详细信息

虚拟手术仿真系统为医学教学提供了一种方便、廉价、有效的方法。切割模拟是该系统重要组成部分，影响整个系统的实时性和真实性，因此对整个切割过程进行深入研究并提出了基于凸多边形的切割算法。首先通过遍历优化索引结构后的八叉树来寻找切割起点，由起点开始，以切割轨迹为参照，采用邻居搜索策略寻找所有被切割的三角影，然后通过引入辅助单元组成凸多边形，再对凸多边形进行三角剖分，以实现网格重构。实验证明新的剖分算法抑制了模型单元数量的急剧增长，提高了三角形重构的质量。

关键词：虚拟手术仿真系统软组织切割算法凸多边形网格模型

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Performance analysis of object tracking algorithm

Performance analysis of object tracking algorithm

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3rd International Conference on Image Analysis and Signal Processing, IASP 2011

作者： Cai, Rongtai Wu, Qingxiang Wang, Ping Zhang, Xuguang Hu, Shuo School of Physics Optics Electronic Science and Technology Fujian Normal University Fuzhou 350108 China Key Lab. of Industrial Computer Control Engineering of Hebei Province Yanshan University Qinhuangdao 066000 China

ISBN: (纸本)9781612848808

This paper analyzes the performance of object tracking algorithms. The issues that affect precision in object tracking are analyzed first and how the parameters in tracking algorithms affect the precision in object tracking are introduced. Then, the time complexity of those object-tracking algorithms is discussed. At last, the holistic analysis and evaluation of these object-tacking algorithms are parsed from application range, tracking precision and time complexity. © 2011 IEEE.

关键词： Tracking (position)

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Efficient human action recognition using accumulated motion image and support vector machines

Efficient human action recognition using accumulated motion ...

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International Workshop on Advanced Computational Intelligence and Intelligent Informatics, IWACIII 2011

作者： Cao, Wei Zhang, Xuguang Cao, Shukai Zhang, Jie Wang, Mingjia Han, Guangliang Key Lab. of Industrial Computer Control Engineering of Hebei Province Institute of Electrical Engineering Yanshan University Qinhuangdao 066004 China Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China

Vision-based human action recognition provides an advanced interface, and research in this field of human action recognition has been actively carried out. This paper describes a scheme for recognizing human actions from a video sequences. The proposed method is an extension of the Motion History Image(MHI) method based on the ordinal measure of accumulated motion, which is robust to variations of appearances. We define the accumulated motion image(AMI) using image differences firstly. Then the AMI of the video sequencesis resized to a M×N regulation following the standard of training phases. Finally, we employ Support Vector Machine(SVM) as a classifier to distinguish the current activity in target video sequences. In a word, our proposed algorithm not only outperforms the state of art on public available KTH data set and Weizmann data set, but also proves practical to some real world applications, in addition, this method is computationally simple and able to achieve a satisfactory accuracy.

关键词： Support vector machines

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