检索结果-内蒙古大学图书馆

Mediterranean Electrotechnical Conference (MELECON)

作者： Z. Vukic L. Kuljaca D. Milinovic Department of Control Engineering and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

The paper presents results of research with the new predictive autopilot structure (PIP+D) with gain scheduling. The autopilot is tested and compared with conventional PID autopilot for a mariner class ship. The autopilot parameters are changed with the speed of the ship using the gain scheduling technique. Results obtained during the research show that the proposed autopilot structure is to be recommended if improved performance is of prime interest, when the velocity of the ship is changing. The analysis is based on the simulation of a mariner class ship as a nonlinear system, with the steering servo system taken as a nonlinear model. Results of the simulation are included.

关键词： Marine vehicles Limit-cycles Gears Servomechanisms System testing Spirals Mathematical model Performance gain Regulators

来源：评论

学校读者我要写书评

暂无评论

A Simulation Model for the Compression of Audio Information

引用

International Journal of Modelling & Simulation 1996年第1期16卷 21-21页

作者： Kwong, S. Man, K. F. Department of Computer Science City University of Hong Kong Kowloon Hong Kong Department of Electronic Engineering City University of Hong Kong Kowloon Hong Kong University of Waterloo Control Data Canada Bell Northern Research City University of Hong Kong Department of Computer Science Cranfield Institute of Technology United Kingdom UK Aerospace Industry Electronic Engineering Department City University of Hong Kong IFAC Real-time Control Computing Working Group IFAC IEEE

Advances in signal processing allow us to model the audio signal in terms of mathematical representation. Compressed audio signal are also important for low-bit-rate media in order to minimize transmission cost. Applications such as movies on compact disc, audio conferencing, and digital television also require a good model for the audio compression. We present a model for compressed audio signal. By varying different modelling parameters, we obtain the simulation result of the proposed model of the audio coder. Simulation results found that it has a good compression Ssignal-to-noise ratio compared with NICAM, CD, and OCF coders.

关键词： Adaptive transform coding Discrete cosine transform Extended lapped transform Modified hermite transform Signal-to-noise ratio

来源：评论

学校读者我要写书评

暂无评论

Multichannel time-series modelling and prediction by wavelet networks

Multichannel time-series modelling and prediction by wavelet...

引用

European Signal Processing Conference (EUSIPCO)

作者： Aleš Procházka Jonathan Smith Prague University of Chemical Technology Department of Computing and Control Engineering Technická 1905 166 28 Prague 6 Czech Republic South Bank University School of Engineering Systems and Design 103 Borough Road London SE1 OAA England

Multichannel time-series result from observations of a given engineering, biomedicai, econometric or environmental variable taken at different locations. Processing this type of signal presents problems associated with its extrapolation in given space ranges and its possible prediction. This paper presents a comparison of seasonal AR modelling of such signals and the application of wavelet networks to the system identification and prediction of a particular signal. The choice of wavelet functions and the optimization of their coefficients is discussed as well. Each method suggested in the paper is verified for simulated signals at first and then used for the analysis of real signals, including the observation of air pollution. All algorithms are written in the MATLAB environment.

关键词： Wavelet analysis Neural networks Predictive models Atmospheric modeling Wavelet transforms Air pollution Wavelet domain

来源：评论

学校读者我要写书评

暂无评论

Processor architecture model for fuzzy control

Processor architecture model for fuzzy control

引用

IEEE International Symposium on Intelligent control (ISIC)

作者： D. Basch M. Zagar Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

In this paper, the architecture of a fuzzy processor intended for high-speed control applications is described. Its main advantage is the inference speed that does not depend on the number of used inputs and rules. This is accomplished by the usage of content addressable memory as a rule set storage. The proposed architecture was simulated and the simulation results give the inference speed of about 200 KFLIPS.

关键词： Fuzzy control Computer architecture Process control Application software Microprocessors Fuzzy logic Fuzzy sets control engineering computing Associative memory Packaging

来源：评论

学校读者我要写书评

暂无评论

Use of Optimal Constrained Covariance control (OC 3 ) in Dynamic Positioning of Floating Vessels

引用

IFAC Proceedings Volumes 1995年第2期28卷 9-15页

作者： S. Mandžuka Z. Vukić Control Engineering Department Brodarski institute d.o.o. Av. V. Holjevca 20 41000 Zagreb CROATIA Department of Control and Computer Engineering in Automation University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 41000 Zagreb CROATIA

A new technique for control system design based on the Optimal Constrained Covariance control (OC 3 ) is presented. A design procedure of control system for dynamic ship positioning is proposed. In the papers published so far the controller gain matrices were detennined using the classical Linear Quadratic Gaussian (LQG) optimal control technique, the pole-placement technique and characteristic locus design method. The main disadvantage of these techniques is their poor correspondence with the real performance requirements of control system. Using the proposed technique this disadvantage is avoided. The results of computer simulation using OC 3 control are presented.

关键词： LQG control Constrained covariance control Dynamic positioning

来源：评论

学校读者我要写书评

暂无评论

Simplified analysis of the three-phase PWM switching converter

Simplified analysis of the three-phase PWM switching convert...

引用

International Conference on Industrial Electronics, control and Instrumentation

作者： N.A. Rahim T.C. Green B.W. Williams Department of Electrical Engineering Control and Systems Theory Faculty of Engineering University Malaya Kuala Lumpur Malaysia Department of Electrical & Electronic Engineering Imperial College London London UK Department of Computing Electrical Engineering Heriot-Watt University Edinburgh UK

Pulsewidth modulation, similar to voltage-space vector control in switches utilizing a field programmable gate array, is compared with PSpice simulation in a three switches converter is presented. The PSpice simulation is used in time domain simulation of the rectifier and inverter circuit. The PSpice PWM simulation modelled is compared with the experiment which is implemented in a field programmable gate array based on a carrier frequency of 19.2 kHz. The PWM is applied to the converter operated as a step-down converter where the output voltage can be controlled by the modulation index in the range of 0 to 1.5 V/spl circ//sub ph/. Simulation and experimental results are provided to demonstrate the effectiveness of the proposed model.

关键词： Pulse width modulation Pulse width modulation converters Switching converters Circuit simulation Switches Field programmable gate arrays Modulation coding Rectifiers Pulse width modulation inverters Frequency

来源：评论

学校读者我要写书评

暂无评论

Database design for machining cell level product specification

Database design for machining cell level product specificati...

引用

International Conference on Industrial Electronics, control and Instrumentation

作者： S.-A. Andreasson A. Adlemo M. Fabian P. Gullander B. Lennartson Department of Computing Science Chalmers University of Technology Goteborg Sweden Department of Computer Engineering Chalmers University of Technology Goteborg Sweden Control Engineering Laboratory Chalmers University of Technology Goteborg Sweden Department of Production Engineering Chalmers University of Technology Goteborg Sweden

To create a flexible machining cell control system a control algorithm is required that is based on models of products and resources. The scope of this paper is to present the database structure of a model used to des... 详细信息

关键词： Machining Object oriented modeling Relational databases control systems control system synthesis Manufacturing systems control engineering Robots Design methodology control engineering computing

来源：评论

学校读者我要写书评

暂无评论

Robotic fixtureless assembly of sheet metal parts using dynamic finite element models: modelling and simulation

Robotic fixtureless assembly of sheet metal parts using dyna...

引用

IEEE International Conference on Robotics and Automation (ICRA)

作者： J.K. Mills J.G.-L. Ing Laboratory For Nonlinear Systems Control Department of Mechanical Engineering University of Toronto Toronto ONT Canada Computing and Communications Division Canadian Pacific Limited Toronto ONT Canada

This paper describes work performed to model the dynamics of a system consisting of two manipulators bringing sheet metal components of a car-body into contact for welding. A sheet metal payload is first discretized into finite shell elements. The flexible payload dynamics are derived via the Lagrangian formulation and combined with the robot dynamics to form one robot-and-payload system. The system equations are simplified by first ignoring certain of the terms that describe the interaction between the flexible and rigid-body coordinates; and second, by applying Guyan reduction. The model developed is applied to simulate the mating of two halves of a car door under three control methods: PD control with gravity compensation, computed torque control, and master/slave hybrid position/force control.

关键词： Robotic assembly Robot kinematics Manipulator dynamics Payloads Force control Torque control Welding Lagrangian functions Equations Computational modeling

来源：评论

学校读者我要写书评

暂无评论

Expert control of Vacuum Pan Crystallization

引用

IEEE control Systems 1994年第5期14卷 28-34页

作者： Michal, Jan Kmínek, Milos Kmínek, Pavel Department of Computing and Control Engineering Prague Institute of Chemical Technology Technicka 5 166 28 Praha 6 Czech Republic

Vacuum pan crystallization is a process that is very difficult to control by classical means. This paper presents a method of using a rule-based expert system for the control of such a process. The structure of the expert controller for adjusting the characteristic conductivity is shown to consist of a diagnostic expert system and a discrete dynamic model that is used for conversion of semantic results into numeric output values. The expert controller was implemented in the sugar factory in Lovosice in 1993.< >

关键词： Crystallization Feeds Sugar industry Automatic control Diagnostic expert systems control systems Production facilities Crystals Solids Temperature measurement

来源：评论

学校读者我要写书评

暂无评论

Application of the Expert control in a Sugar Factory

引用

IFAC Proceedings Volumes 1994年第10期27卷 177-182页

作者： J. Michal M. Kmínek P. Kmínek Department of Computing and Control Engineering Institute of Chemical Technology Technická 5 166 28 Praha 6 The Czech Republic

This paper presents a method for using a rule-based expert system for the control of several technological processes in sugar production. The structure and principle of the expert controller are shown. Extraction, crystallisation and process co-ordination were chosen for practical implementation of the expert system as processes which are very difficult to control by classical means. Some experience from the implementation in the sugar factory in Lovosice is presented.

关键词： Expert control crystallisation control vacuum pan crystallisation sugar extraction co-ordination and supervisory control control applications expert systems non-linear control systems process control

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：