检索结果-内蒙古大学图书馆

Asian control Conference

作者： M.R. Rafimanzelat M.J. Yazdanpanah Control & Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

The purpose of this paper is to design a high performance sliding mode controller through the use of a new switching function. This method uses the idea of boundary layer sliding mode while taking the boundary layer width as a function of the angle between the state trajectory and the sliding surface which we call approach angle. By incorporating the approach angle into the switching function, the overall sliding mode controller guarantees the asymptotical stability of the system while having only a slight amount of chattering. This method overcomes the shortcomings of a pure discontinuous switching such as excessive chattering, while maintaining its benefit that is the asymptotical stability is guaranteed. The proposed method is used to control an inverted pendulum. It is also compared with a pure switching function. Simulation results show that the new sliding mode controller has good control performance with negligible chattering.

关键词： Sliding mode control Asymptotic stability control systems Closed loop systems Robust control Linear approximation Piecewise linear approximation Robustness Intelligent control control system synthesis

来源：评论

学校读者我要写书评

暂无评论

Sensorless speed control of induction motor derives using a robust and adaptive neuro-fuzzy based intelligent controller

Sensorless speed control of induction motor derives using a ...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： F. Rashidi Center of Excellence for Control and Intelligent Processing Department of Electrical and Computer Engineering University of Tehran Iran

In this paper a novel sensorless adaptive neurofuzzy speed controller for induction motor derives is formulated. An artificial neural network (ANN) is adopted to estimate the motor speed and thus provide a sensorless speed estimator system. The performance of the proposed adaptive neurofuzzy speed controller is evaluated for a wide range of operating conditions for induction motor. These include startup, step changes in reference speed, unknown load torque and parameters variations. Obtained results show that the proposed ANN provides a very satisfactory speed estimation under the above mentioned operation conditions and also the sensorless adaptive neurofuzzy speed controller can achieve very robust and satisfactory performance and could be used to get the desired performance levels. The response time is also very fast despite the fact that the control strategy is based on bounded rationality.

关键词： Velocity control Induction motors Robust control Programmable control Adaptive control Intelligent sensors Sensorless control Artificial neural networks Artificial intelligence Torque

来源：评论

学校读者我要写书评

暂无评论

Power system transient stabilization and voltage regulation based on simple neuron structure

Power system transient stabilization and voltage regulation ...

引用

International Conference on Mechatronics (ICM)

作者： R. Mohammadi-Milasi P. Jabehdar-Maralani Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Iran

A global power system transient stabilizer and voltage regulator based on a simple neuron structure is proposed in this paper. Two independent controllers i.e. transient controller and voltage regulator are designed. To this end, a simple structure controller that consists of only one neuron is used. The proposed neuro-controller does not need any offline training and the parameters can be determined on-line. To achieve the global control action that guarantees both transient stability and voltage regulation, we used a membership function that was a function of measurable parameters of the system. The proposed global control law acts in a manner in which in the transient period, the transient stabilizer is the dominant controller and in the post transient period, the voltage controller is the dominant one. The effectiveness of the proposed global control action is demonstrated through some computer simulations on a single machine infinite-bus (SMIB) power system.

关键词： Power system transients Voltage control Neurons Regulators control systems Stability computer simulation Power system simulation Power system control Power systems

来源：评论

学校读者我要写书评

暂无评论

A new approach to commutation in predictive control of switch reluctance motor

A new approach to commutation in predictive control of switc...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： A. Sadeghzadeh B.N. Araabi Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran Iran

This paper provides a model predictive approach to control switched reluctance motors (SRM's). A local linear neuro-fuzzy model is used to model SRM. Then a predictive control schema is devised considering an appropriate energy term in the optimization phase. Commutation occurs naturally as an outcome of the predictive control design process, not as an extra step added to the control policy. From a computational view point, we use locally linear model predictive control that with a quadratic cost and linear constraints reduces to a simple quadratic program, which can be solved very fast in a closed form. Simulation studies justify applicability of our proposed method to SRM applications.

关键词： Switches Commutation Predictive control Reluctance motors Predictive models Reluctance machines Magnetic materials Photonic crystals Costs Strontium

来源：评论

学校读者我要写书评

暂无评论

Robust H/sub /spl infin// congestion control in differentiated services networks

Robust H/sub /spl infin// congestion control in differentiat...

引用

International Conference on Information and Communication Technologies: From Theory to Applications, ICTTA

作者： M. Jalili-Kharaajoo Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran Iran

A robust active queue management system is designed to secure high utilization, bounded delay and loss, while the network complies with the demands each traffic class sets. To this end, we use the H/sub /spl infin// control theory. Simulation results of the proposed control action demonstrate the effectiveness of the controller in providing robust queue management system.

关键词： Robust control Intelligent networks Diffserv networks Internet TCPIP Communication system traffic control Traffic control Protocols IP networks Streaming media

来源：评论

学校读者我要写书评

暂无评论

An experimental study of subsonic cavity flow - physical understanding and control

An experimental study of subsonic cavity flow - physical und...

引用

2nd AIAA Flow control Conference 2004

作者： Debiasi, M. Yan, P. Little, J. Özbay, H. Myatt, J. Samimy, M. Gas Dynamics and Turbulence Laboratory Collaborative Center of Control Science The Ohio State University GDTL/AARL2300 West Case Road Columbus OH 43235 United States Department of Mechanical Engineering United States Department of Electrical and Computer Engineering United States Air Force Research Laboratory United States

ISBN: (纸本)9781624100307

We present the results of an experimental investigation that uses two different techniques for controlling a shallow cavity flow in the Mach number range 0.25-0.5. The first method is basically an open-loop design that relies on zero-net-mass forcing at an optimal frequency for suppressing the cavity flow resonance. The second method is a parallel-proportional with time delay controller, a linear control design that relies on real-time feedback from the flow to counteract the resonance. With properly tuned parameters, both methods are successful in reducing the cavity resonance for flows in the Mach number range explored. However the parallel-proportional controller exhibits a superior robustness with respect to departure of the Mach number from the design conditions, a signature of feedback control designs that are naturally more capable to handle changes of the open-loop plant. An additional benefit of the feedback control method is the lower power requirement to achieve comparable suppression of the resonance. An interpretation is presented of the physical mechanisms by which the optimal forcing frequency and the parallel-proportional with time delay controller reduce the cavity flow resonance. The results support the idea that the optimal forcing frequency control induces in the system a rapid switching between modes competing for the available energy that can be extracted from the mean flow. In the case of parallel- proportional control mode switching is also observed which involves a larger range of frequencies and spreads more the extracted energy thus producing a flow with a quieter, more broadband spectral signature.

关键词： Mach number

来源：评论

学校读者我要写书评

暂无评论

Protein metal binding residue prediction based on neural networks

引用

11th International Conference on Neural Information Processing, ICONIP 2004

作者： Lin, Chin-Teng Lin, Ken-Li Yang, Chih-Hsien Chung, I-Fang Huang, Chuen-Der Yang, Yuh-Shyong Department of Electrical and Control Engineering Chiao-Tung University HsinChu Taiwan Computer Center Chung-Hua University HsinChu Taiwan Inst. of Medical Science University of Tokyo Tokyo Japan Department of Electrical Engineering HsiuPing Institute of Technology Dali Taichung Taiwan Inst. of Bioinformatics Chiao-Tung University HsinChu Taiwan

ISBN: (纸本)3540239316

It is known that over one-third of protein structures contain metal ions, and they are the necessary elements in life system. Traditionally, structural biologists used to investigate properties of metalloproteins (proteins which bind with metal ions) by physical means and interpret the function formation and reaction mechanism of enzyme by their structures and observation from experiments in vitro. Most of proteins have primary structures (amino acid sequence information) only;however, the 3-dimension structures are not always available. In this paper, a direct analysis method is proposed to predict protein metalbinding amino acid residues only from its sequence information by neural network with sliding window-based feature extraction and biological feature encoding techniques and it can successfully detect 15 binding elements in protein, and 6 binding elements in enzyme. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Metal ions

来源：评论

学校读者我要写书评

暂无评论

A 3-D deformable surface method for automatic hippocampus-amygdala complex segmentation

A 3-D deformable surface method for automatic hippocampus-am...

引用

2004 Nuclear Science Symposium, Medical Imaging Conference, Symposium on Nuclear Power Systems and the 14th International Workshop on Room Temperature Semiconductor X- and Gamma- Ray Detectors

作者： Karimi, M.M. Batmanghelich, N. Soltanian-Zadeh, H. Lucas, C. Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran 14395-515 Iran Institute for Studies in Theoretical Physics and Mathematics Tehran Iran Department of Radiology Henry Ford Health System Detroit MI 48202 United States

In this paper, we propose an atlas-based method for hippocampus-amygdala complex segmentation. An atlas is registered on all subjects and its transformation is calculated for each subject. This transformation is applied to the structural segmentation of the complex in atlas to construct an initial surface for the hippocampus-amygdala complex of each subject. A possibility approach is introduced for the segmentation process. Two different kinds of deformation based on edges and information obtained from tissue segmentation are used to find different parts of the complex. A new energy is defined to use tissue information. This energy is adopted to expand the model to embed dominant gray matter points in the volume and also withdraw from dominant white matter and CSF points. The initial shape is divided into several parts. In the normal direction of the center of each part, we construct a profile which search for the best poult that maximizes this new energy. This algorithm is reliable for finding the overall shape of the complex. It overcomes the poor features of the complex such as weak edges and noise. The algorithm is examined on 5 different subjects and validated using two different validation methods. © 2004 IEEE.

关键词： Medical imaging

来源：评论

学校读者我要写书评

暂无评论

Estimation of physical parameters of stable and unstable systems via estimation of step response

Estimation of physical parameters of stable and unstable sys...

引用

International Conference on control, Automation, Robotics and Vision (ICARCV)

作者： P.J. Gawthrop Liuping Wang Center for Systems and Control and Department of Mechanical Engineering University of Glasgow Glasgow UK School of Electrical and Computer Engineering RMIT University VIC Australia

Experimental validation of a two-stage method for the identification of physical system parameters from experimental data is presented. The first stage compresses the data as an empirical model and the second stage then uses data extracted from the empirical model of the first stage within a non-linear estimation scheme to estimate the unknown physical parameters. The approach handles unstable systems using exponential weighting.

关键词： Parameter estimation control systems Data mining Polynomials Bonding System identification Data compression Predictive models Mechanical engineering Physics computing

来源：评论

学校读者我要写书评

暂无评论

Observer-Based Model Reference Sliding-Mode control of Active Suspension Systems

引用

IFAC Proceedings Volumes 2004年第13期37卷 1407-1412页

作者： Alireza Esna Ashari Mohammad Javad Yazdanpanah Control and Intelligent Processing Center of Excellence Department of Electrical and Computer Engineering University of Tehran Tehran. P.O. Box: 14395/515 Iran

In this paper a model reference variable structure controller (VSC) for an active suspension system is designed. A half vehicle model is used in which, the vertical and pitch motions of the mass supported by the suspension and the vertical motion of the suspension masses are considered. Sliding mode controller is applied for the purpose of disturbance attenuation. Unit vector approach, which is a sliding mode control structure for multivariable systems, is used and a robust adaptive nonlinear controller is designed. A reduced-order observer is designed to use only output information. Robust eigenstructure assignment method is implemented in the line of sliding surface design. Simulation results verify the effectiveness of the proposed nonlinear controller scheme in comparison with the passive suspension system and also H ∞ technique. The output of the closed-loop system can also smoothly track a set point in a manner that the vertical position of vehicle may be regulated toward the desired point.

关键词： Model reference Sliding-mode Observers Robust control Active vehicle suspension Passive suspension

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：