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作者： Zhao, Yu Huang, Biao Su, Hongye Chu, Jian State Key Lab. of Industrial Control Technology Institute of Cyber Systems and Control Zhejiang University Hangzhou China University of Alberta Department of Chemical and Material Engineering Edmonton AB T6G-2G6 Canada

This paper is concerned with identification of linear parameter varying (LPV) systems in an input-output setting with Box-Jenkins (BJ) model structure. Classical linear time invariant prediction error method (PEM) is extended to the LPV PEM. Under the new LPV framework, identification of two types of input-output LPV models is considered: one is based on parameter interpolation and the other is based on model interpolation. The effectiveness of the proposed solution is validated by comparison with other existing LPV identification approaches through simulation examples and demonstrated by experiment studies. © 2011 Elsevier Ltd. All Rights Reserved.

关键词： Interpolation

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Analysis and Simulation of Laser Polarization Characteristics on Metal Surface in Short-Range Detection

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AASRI Procedia 2012年 3卷 328-334页

作者： Yu-ying Yang Zhan-zhong Cui Shuang-cheng Wei State Key Lab of Mechatronics Engineering and Control Beijing Institute of Technology Beijing 100081 PR China Department of Arms Engineering Academy of Armored Force Engineering Beijing 100072 PR China

In view of using only the intensity information of retroreflection wave and poor capacity of anti-interference in laser short-range detection, this paper analyzes the polarization characteristics of laser beam on the metal surface and establishes reflection model of polarized laser. A target detection method based on polarization characteristics of reflection laser is putted forward and the simulation of polarization characteristics on the surface of several typical metal targets is implemented at last.

关键词： Short-range Detection Polarization Characteristics Stokes Parameters Metal Target

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Introduction to time series search engine systems

Introduction to time series search engine systems

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2012 International Conference on Systems and Informatics, ICSAI 2012

作者： Zhang, Chuanlei Luo, Ji'An Zhang, Shanwen Zhang, Chen Department of Electrical and Computer Engineering Ryerson University Canada State Key Lab. of Industrial Control Tech. Zhejiang University Zhejiang 310027 China Department of Engineering and Technology Zhengzhou University China Discover Information Technology Limited Shanghai China

Basic structure of time series search engine system, involving acquisition, data processing and retrieval sub-systems, was elab.rated. And options for time series search engine architectures and supported features and... 详细信息

ISBN: (纸本)9781467301992

关键词： Search engines

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An Improved Included Angle Dividing Method for Multimodel control of Hammerstein Systems

An Improved Included Angle Dividing Method for Multimodel Co...

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第23届过程控制会议

作者： Jingjing Du Chunyue Song Xinliang Zhang State Key Lab. of Industrial Control Technology Institute of Industrial Process Control Zhejiang U State Key Lab. of Industrial Control Technology Institute of Industrial Process Control Zhejiang U School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000

An improved included angle dividing method is proposed for Hammerstein systems. In this dividing method, nonlinearity of the system is taken into account to distribute gridding points, so distribution is more reasonable and computation load in dividing is reduced largely. Based on the dividing result, a multimodel predictive controller is designed to overcome the drawbacks of the common nonlinearity inversion control method for Hammerstein systems.

关键词： Improved included angle dividing method Hammerstein systems Multimodel control.

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The characteristics of rock mechanics and acoustic wave parameters of carbonate rock in the north-east Sichuan

The characteristics of rock mechanics and acoustic wave para...

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46th US Rock Mechanics / Geomechanics Symposium 2012

作者： Guo, Y.T. Yang, C.H. Mao, H.J. Chen, J.H. Luo, Y. State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China Sinopec Research Institute of Petroleum Engineering Beijing China Key Lab. of Min. of Educ. for Exploitation of SW Resources and Environment Disaster Control Project Chongqing University Chongqing China

ISBN: (纸本)9781622765140

Carbonate reservoirs have a significant proportion of the known petroleum reserves, with its characteristics of pores and fractures development. A series of lab.ratory testing have been performed. Using high pressure water jet cutting the artificial crack (different angles and different lengths for dolostone & limestone), in order to simulate the natural fractures. We have measured P-wave velocity and S-wave velocity on carbonate rock for original specimens and artificial crack specimens. Results from lab.ratory research are as follows: 1) as the fractures exist, P-wave velocity and S-wave velocity decreased, the fracture has more influence on S-wave velocity than P-wave velocity;2) under uniaxial compression, the curves of axial strain and the compression velocity can be divided into three stages: 3) the fracture has an important influence on mechanical parameters of carbonate rock. Increasing fracture angle and length will result in decreasing the strength parameters under uniaxial compression;4) under condition of confining pressure, P-wave velocity increases with the increasing of confining pressure. The growth rate of dolostone's P-wave velocity is larger than limestone. The research results can be used for better analysis the mechanical and acoustic wave characteristics of carbonate rock in deep drilling engineering and provide technology parameters for exploration in carbonate reservoirs. Copyright 2012 ARMA, American Rock Mechanics Association.

关键词： Limestone

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Out-of-plane compression and impact of woven textile sandwich composites

Out-of-plane compression and impact of woven textile sandwic...

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2012 3rd International Conference on Digital Manufacturing and Automation, ICDMA 2012

作者： Zhao, Long Fan, Hualin Huang, Shiqing PLA University of Science and Technology Nanjing China Laboratory of Structural Analysis for Defense Engineering and Equipment College of Mechanics and Materials Hohai University Nanjing China State Key Laboratory of Automotive Safety and Energy Tsinghua University Beijing China MOE Key Lab. of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

ISBN: (纸本)9780769547725

Woven textile sandwich composite (WTSC) is a light-weight structural material. The manufacturing method of WTSC was introduced in the paper. To reveal the quasi-static and the dynamic crushing behavior of WTSC, out-of-plane compression tests were carried out. Low-velocity impact experiments were carried out to investigate the anti-crush ability of WTSC. The results of the quasi-static and dynamic compression tests show that the woven textile sandwich material has good energy absorption ability. From the difference of the peak loads, it is concluded that the woven textiles have strain rate sensitivity. The intact woven textile sandwich panel and the destroyed one have different anti-crush abilities. Different methods are used to enhance the anti-penetrating of the intact woven textile sandwich panels, for example, increasing the content of the glass fibers, enlarging the diameter of the glass fibers and enlarging the height of front faces and the whole panel. From the experiments, it is concluded that WTSC has light weight, great specific strength and good energy absorption ability. WTSC is a promising light-weight structural material for vehicle bodies. © 2012 IEEE.

关键词： Honeycomb structures

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Equivalent capacity of the lower voltage ride through for wind farm from overcurrent protection in power collection lines

Equivalent capacity of the lower voltage ride through for wi...

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11th IET International Conference on Developments in Power Systems Protection, DPSP 2012

作者： Wang, Bin Dong, Xinzhou Bo, Zhiqian State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China Alstom Grid Stafford ST17 4LX United Kingdom

ISBN: (纸本)9781849196208

Magnitude and duration of voltage sags are the most important two factors to the Lower Voltage Ride Through (LVRT) capacity of the wind generator. Since most voltage sags are caused by the system faults, and sag durations are controlled by the tripping time of overcurrent relay in power collection lines based on the sags' magnitude. The specification of the LVRT capacity of wind generator is introduced into the operation characteristics of the relay in power collection lines. The evaluation model of equivalent LVRT capacity to overcurrent protection is proposed in paper, and the equivalent LVRT capacities from zone I and zone II relay are quantified. Improvement measures are also proposed.

关键词： Overcurrent protection

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Gap Metric Based Gridding and Improved Integrated Multimodel H∞ Loop-shaping control

Gap Metric Based Gridding and Improved Integrated Multimodel...

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第23届过程控制会议

作者： Jingjing Du Wei Qian Chunyue Song School of Electrical Engineering and Automation Henan Polytechnic University Jiaozuo 454000 State Key Lab. of Industrial Control Technology Institute of Industrial Process Control Zhejiang U

A gridding algorithm based on gap metric is proposed for multimodel control of nonlinear systems. In contrast to the common evenly distributed gridding algorithm used in multimodel decomposition, the proposed gap metric based gridding algorithm aims to reduce reliance on previous knowledge and experience and makes the gridding more systematic and more reasonable. Based on the proposed gridding algorithm, an improved integrated multimodel H∞ loop-shaping control is developed, which realizes information symmetry between local linear model selection and local controller design, and raises the efficiency of multimodel controller design largely.

关键词： Gap metric Gridding Integrated Multimodel control H∞ loop-shaping control.

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Positive-sequence component based three-phase unbalanced power flow solution for distribution system with PV nodes

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical engineering 2012年第1期32卷 115-121页

作者： Li, Hongwei Sun, Hongbin Zhang, An'an Liu, Qingyou State Key Laboratory of Oil and Gas Reservoirs Geology and Exploitation Southwest Petroleum University Chengdu 610500 Sichuan Province China State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

The traditional power flow methods aren't appropriate to the electrical distribution systems with distributed generators (DG). Therefore, a direct unbalanced three-phase power flow algorithm was presented in this paper. The proposed approach which was developed based on the path matrix, utilized the special topological structure of distribution systems and established the incident matrix of node voltages and injection currents. Based on the assumption that the positive-sequence voltage magnitudes of PV nodes are invariable, the relation of reactive power and compensation voltage for the PV nodes had been derived by the positivesequence component and path matrix. As a result, a new approach handling PV nodes of DG had been proposed and could be integrated into the proposed power flow method. It needn't introduce any additional active power at PV nodes and kept the positive-sequence voltage magnitudes on their scheduled values, considering that reactive power limits were not violated. The results of the 6-bus and the 69-bus test systems verified the validity and universality of the proposed methods. © 2012 Chin. Soc. for Elec. Eng.

关键词： Reactive power

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Post-processing algorithm based on total differential method for multi-axis machine tools with arbitrary configuration

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Jixie Gongcheng Xuebao/Journal of Mechanical engineering 2012年第13期48卷 121-126页

作者： Peng, Fangyu Ma, Jiyang Wang, Li Yan, Rong Li, Bin State Key Lab. of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China National Numerical Control System Engineering Research Center Huazhong University of Science and Technology Wuhan 430074 China

Due to existing post-processing algorithm, which is only suitable for a specific type of multi-axis NC machine tool, a generalized method that fits arbitrary configuration is presented. It derives a general kinematic model from multi-body kinematics, and describes the spatial relationship between adjacent CL-data as total differential. The complicated reverse kinematics problem is transformed into solving linear equations. The initial machine control data is solved with the combination of numerical method and total differential method to ensure solving accuracy of subsequent CL-data. In comparison with conventional methods, experiments on a specific machine tool show that the total differential method has attributes of being better generalized, more accurate, and with faster computing speed. © 2012 Journal of Mechanical engineering.

关键词： Machine tools

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