检索结果-内蒙古大学图书馆

The 22nd China control and Decision Conference(2010年中国控制与决策会议)

作者： Zhuoda Jiang Key Laboratory of Numerical Control of Jiangxi Province Jiujiang University Jiujiang Jiangxi 332005 China School of Mechatronics Engineering and Automation Shanghai University Shanghai 200072 China

An intelligent model is developed to predict the surface roughness of aluminium alloy in the milling operation based on least square support vector machine (LS-SVM). The Taguchi’s design of experiment was adopted to provide enough training information with minimal experiment times. The present prediction model is to analyze the effects of condition factors, such as spindle speed, feed rate, etc. on the surface roughness (Ra). The tests have been conducted to verify the LS-SVM model, and the average prediction error is about 8％. It means the model is capable to predict the surface roughness well.

关键词： Prediction model Surface roughness Aluminium alloy Support vector machine(SVM) Least square SVM (LS-SVM)

来源：评论

学校读者我要写书评

暂无评论

Positioning Speed and Precision control of a Segment Erector for a Shield Tunneling Machine

Positioning Speed and Precision Control of a Segment Erector...

引用

2010 IEEE/ASME international conference on advanced intelligent mechatronics (AIM 2010)

作者： Hu Shi Guofang Gong Huayong Yang Lintao Wang Institute of Mechatronics and Control Engineering University of Zhejiang Hangzhou China

This paper deals with a positioning speed and precision control system for the assembly of segments of a shield tunneling machine. First, we design a six degrees of freedom segment erector with electrohydraulic drive. Then, the segment positioning process and the dynamics model of the electrohydraulic system are analyzed theoretically. Segment positioning control system is designed, making comparisons between speed and displacement/angle control in terms of efficiency and precision. Several reference speed run curves are selected to control the segment positioning process. Simulations are carried out to achieve the selected optimal run speed of the segment. The simulation results verify the validity of the proposed control system.

关键词： Motion segmentation Velocity control Actuators Valves Electrohydraulics

来源：评论

学校读者我要写书评

暂无评论

Parameter identification of a linear permanent magnet motor using particle swarm optimization

Parameter identification of a linear permanent magnet motor ...

引用

7th Annual International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2010

作者： Therdbankerd, Tithiwat Sanposh, Peerayot Chayopitak, Nattapon Fujita, Hideaki Department of Electrical Engineering Intelligent Mechatronics Automation Robotics and Control Laboratory Kasetsart University 50 Phahonyothin Rd. Ladyao Jatujak Bangkok 10903 Thailand Industrial Control and Automation Laboratory National Electronics and Computer Technology Center 112 Thailand Science Park Phahonyothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand Department of Electrical and Electronic Engineering Tokyo Institute of Technology S3-18 2-12-1 Ookayama Meguro-ku Tokyo 152-8550 Japan

ISBN: (纸本)9789746724913

Accurate and effective parameter identification is an important engineering task in high performance control system design. One emerging approach to effectively identify such nonlinear or dynamic unknown parameters is to use Particle Swarm Optimization (PSO) algorithm. Linear Permanent Magnet (LPM) motor is a high performance actuator employed in many applications that require direct linear motion without mechanical transmission for high acceleration and accurate positioning. Therefore, accurate motor parameters are necessary to effectively control the LPM motors. This paper proposes a simple PSO based method with chirp inputs to identify the LPM motor's parameters. The simulations and experiments are conducted to verify the results and determine the effectiveness of the proposed method.

关键词： Parameter estimation

来源：评论

学校读者我要写书评

暂无评论

Damping Structure Selection in Nonlinear Ship Manoeuvring Models

引用

IFAC Proceedings Volumes 2010年第20期43卷 73-78页

作者： Tristan Perez Elías Revestido-Herrero School of Engineering Discipline of Mechanics and Mechatronics The University of Newcastle Callaghan NSW 2308 AUSTRALIA Centre for Ships and Ocean Structures (CeSOS) Norwegian University of Science and Technology (NTNU) Trondheim NORWAY Dept. of Electronic Technology Systems Engineering and Automatic Control University of Cantabria Spain

This paper presents the application of a statistical method for model structure selection of lift-drag and viscous damping components in ship manoeuvring models. The damping model is posed as a family of linear stochastic models, which is postulated based on previous work in the literature. Then a nested test of hypothesis problem is considered. The testing reduces to a recursive comparison of two competing models, for which optimal tests in the Neyman sense exist. The method yields a preferred model structure and its initial parameter estimates. Alternatively, the method can give a reduced set of likely models. Using simulated data we study how the selection method performs when there is both uncorrelated and correlated noise in the measurements. The first case is related to instrumentation noise, whereas the second case is related to spurious wave-induced motion often present during sea trials. We then consider the model structure selection of a modern high-speed trimaran ferry from full scale trial data.

关键词： System Identification Regression Analysis Ship Dynamics Hypothesis Testing

来源：评论

学校读者我要写书评

暂无评论

Fast implicit surface reconstruction method based on normal constraints

Fast implicit surface reconstruction method based on normal ...

引用

International Conference on mechatronics and Automation

作者： Guo, Guangyue Wu, Xiaojun Wang, Michael Yu Wu, Jianhuang Shenzhen Graduate School Harbin Institute of Technology 518055 China Division of Control and Mechatronics Engineering Shenzhen Graduate School Harbin Institute of Technology 518055 China Mechanical and Automation Engineering Department Chinese University of Hong Kong Shatin N.T. Hong Kong Shenzhen Institute of Advanced Integration Technology Chinese Academy of Sciences Chinese University of Hong Kong Shatin N.T. Hong Kong

ISBN: (纸本)9781424451418

In this paper, a new procedure for implicit surface reconstruction from oriented points is presented. A normal constraints based implicit polynomials fitting method and the partition of unity approach are fused into our framework. Firstly, a large scale input data is subdivided into some overlapping patches by octree. Then the global implicit surface is transferred into local implicit patch fitting and blending of them. To fit the local implicit polynomials, we build an energy by three steps corresponding to enforcement of the interpolatory constraints, satisfying of normal constraints and enhancement of fitting stability. The unkowns in an implicit polynomial are determined by minimizing this quadratic energy function. It is demonstrated in some experiments with several real data sets that this combination provides an intuitive and effective means to approximate the scattered point data associated normals. © 2010 IEEE.

关键词： Surface reconstruction

来源：评论

学校读者我要写书评

暂无评论

Optimal design of brushless DC motor by utilizing novel coefficient modeling for skewed PM and overhang structure

Optimal design of brushless DC motor by utilizing novel coef...

引用

14th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC2010

作者： Hwang, Kyu-Yun Rhyu, Se-Hyun Kwon, Byung-Il Department of Electronic Electrical Control and Instrumentation Engineering Hanyang University 1271 Sa-3 dong Sangnok-gu Ansan Kyeonggi-do 425-791 Korea Republic of Intelligent Mechatronics Research Center Korea Electronics Technology Institute 203-101 Bucheon Yakdae-dong Wonmi-gu Bucheon-si Kyeonggi-do 420-140 Korea Republic of

ISBN: (纸本)9781424470594

A novel coefficient modeling for skewed PM and overhang structure as a coefficient estimation method is introduced for optimal design in the 2D region for a PM motor. The novel model is constructed using 3D FEM and a response surface method (RSM) based on moving least square method (LSM). Then the novel model is coupled with an additional approximated model for optimal design in the 2D region. Finally, by combining the novel model and evolution algorithm (EA), an optimal design is performed. The usefulness of the proposed design is verified by 3D FEM simulation results. © 2010 IEEE.

关键词： Brushless DC motors

来源：评论

学校读者我要写书评

暂无评论

Effect of electrode number on the operating range of capacitance proximity fuze

引用

Yi Qi Yi Biao Xue Bao/Chinese Journal of Scientific Instrument 2010年第8 SUPPL.期31卷 98-103页

作者： Zhang, Xin Cui, Zhanzhong Xu, Lixin National Key Laboratory of Mechatronics Engineering and Control Beijing Institute of Technology Beijing 100081 China

To define which detect electrode type between two elecrodes and three elecrodes can extend the operating range of capacitance proximity fuze, took sphere as elecrode, and equivalent sphere models of two and three elecrodes were established. The mirror method and Ansoft Maxwell microsoft were used to calculate the capacitance value of the model, then got the figure of capacitance-missile target distance. Based on this, Matlab was used to calculate the oscillator frequency, and got the fiure of frequency-missile target distance. According to the capacitance value and oscillator frequency, got the figure of capacitance changes-missile target distance and the figure of frequency changes- missile target distance. By comparing the frequency changes of the two electrodes with the changes of the three electrodes, draw the conclusion that the changes of three electrodes type are bigger than the ones of two electrodes type, so three electrodes type is better than the the two electrodes type to extend the operating range.

关键词： Missiles

来源：评论

学校读者我要写书评

暂无评论

Comparison of three electrical capacitance tomography systems

Comparison of three electrical capacitance tomography system...

引用

IEEE International Workshop on Imaging Systems and Techniques (IST)

作者： Dixiang Chen Wuqiang Yang Xiang Deng School of Mechatronics Engineering and Automation National University of Defense Technology Changsha China School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing China School of Electrical and Electronic Engineering University of Manchester Institute of Science and Technology Manchester UK

Electrical capacitance tomography (ECT) has been developed for two decades to visualize the internal behavior of industrial processes containing dielectric components. Three different ECT systems have been developed: (1) based on a charge/discharge capacitance measuring circuit, (2) based on an AC circuit and (3) based on an impedance analyzer. In this paper the operation principles, calibration methods and some performance of the three systems are compared. The experimental results prove that the AC-based ECT system is superior to the charge/discharge ECT system. Although the impedance analyzer based ECT system can provide the highest accuracy and the best image quality, it is bulky and expensive.

关键词： Electrical capacitance tomography Circuits Visualization Capacitance measurement Current measurement Dielectric measurements Charge measurement Impedance measurement Calibration Image analysis

来源：评论

学校读者我要写书评

暂无评论

Auxiliary Model-based Stochastic Gradient Algorithm for Multivariable Output Error Systems

引用

Acta Automatica Sinica 2010年第7期36卷 993-998页

作者： Feng DING Xiao-Ping LIU School of Communication and Control Engineering Jiangnan University Wuxi 214122 P. R. China School of Mechatronics Engineering Nanchang University Nanchang 330031 P. R. China Department of Systems and Computer Engineering Carleton University Ottawa K1S 5B6 Canada

The identification problem of multivariable output error systems is considered in this paper. By constructing an auxiliary model using available input-output data and by replacing the unknown inner variables in the information vector with the outputs of the auxiliary model, an auxiliary model-based stochastic gradient (AM-SG) identification algorithm is presented. Convergence analysis using the martingale convergence theorem indicates that the parameter estimates given by the AM-SG algorithm converge to their true values. The AM-SG algorithm with a forgetting factor is given to improve its convergence rate. The simulation results confirm the theoretical findings.

关键词： Recursive identification parameter estimation stochastic gradient (SG) auxiliary model identification multivariable systems convergence property martingale convergence theorem

来源：评论

学校读者我要写书评

暂无评论

Vision based lane keeping assistance control triggered by a driver inattention monitor

Vision based lane keeping assistance control triggered by a ...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Özgür Tunçer Levent Güvenç Fuat Coşkun Elif Karslıgil Ford Otosan – Gebze Engineering Gebze Kocaeli Turkey ITU Mekar Labs and Automotive Control and Mechatronics Research Center Istanbul Technical University Istanbul Turkey Department of Computer Engineering Yildiz Technical University İstanbul Turkey

Inattentive and impaired drivers are a major cause of road accidents. Especially when impaired by drugs, fatigue or physical handicaps, the skill levels, driving habits, capabilities and decisions of a human driver are adversely affected. In such cases, the ability of a driver to safely operate a vehicle may be augmented considerably by well tuned and driver adaptive warning and assistance systems. Data from 105 drivers were collected in the Drive Safe project on an approximately 30 km route containing both city and highway traffic. The data was used to develop methods for determining inattentive/impaired drivers. This paper is on a lane keeping driver assistant system that is activated once such an inattentive/impaired driver who cannot perform a good task of lane keeping by himself is determined. Robust, parameter space based and velocity scheduled control design techniques carried out in the COMES toolbox are used for designing the lane keeping controller. A camera based image processing algorithm for lane detection and tracking is used. The image processing algorithm and the lane keeping assistant control system are evaluated first using offline simulations and then using more realistic, real time hardware-in-the-loop simulations. While a relatively simple linear model is used for lane keeping controller design, evaluation of the designed controller also uses the high fidelity, high order, realistic and nonlinear vehicle model in Carmaker HiL. A PC is used for processing video frames coming from an in-vehicle camera pointed towards the road ahead. Lane detection and tracking computations including fitting of composite Bezier curves to curved lanes are carried out in this PC. A dSpace microautobox is available for obtaining the lane data from the PC and the Carmaker vehicle data from the dSpace compact simulator used and calculating the required steering actions and sending them to the Carmaker vehicle model. Offline and real time simulation results demonstrate t

关键词： Process control Robustness

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：