检索结果-内蒙古大学图书馆

International Conference on Electrical engineering, Computing Science and automatic control (CCE)

作者： Juan Anzurez-Marin Elisa Espinosa-Juárez Bernardino Castillo-Toledo Electrical Engineering Faculty Universidad Michoacana de San Nicolás de Hidalgo Morelia Michoacán México Department of Automatic Control CINVESTAV-IPN Unidad Guadalajara Guadalajara Jalisco México

In this paper results of the application of a hybrid Fault Detection and Isolation scheme are presented. A Takagi-Sugeno fuzzy model is used to describe the system and a type of sliding mode observers are designed to estimate the system state vector; from this, the diagnostic signal-residual is generated by the comparison of measured and estimated output. Neural Networks are proposed in order to solve the fault isolation problem based on signal-residual. The faulted component is identified from the active signal-residuals by means of the application of the presented technique based on neural networks. This paper shows an application of the fault diagnosis technique, which was satisfactorily tested in a two-tank hydraulic system.

关键词： Observers Neural networks Vectors Fault diagnosis Mathematical model Takagi-Sugeno model Electrical engineering

来源：评论

学校读者我要写书评

暂无评论

Computational intelligence and hybrid models for feature selection and classification of bioinformatics datasets

Engineering Intelligent Systems

引用

engineering Intelligent systems 2013年第4期21卷 249-269页

作者： Helmy, Tarek Department of Information and Computer Science College of Computer Science and Engineering King Fahd University of Petroleum and Minerals Dhahran 31261 Saudi Arabia College of Engineering Department of Computers Engineering and Automatic Control Tanta University Egypt

The science of bioinformatics is increasingly being used to improve the quality of life as we know it. This opens the door to both machine learning and computational intelligence techniques to play a major role in bioinformatics. Recently, Type-1 and Ttype-2 fuzzy logic systems have been introduced as novel computational intelligence approaches for both prediction and classification. They were successfully used in several areas of science and engineering, however, they have not been fully utilized in the bioinformatics, particularly the Type-2 fuzzy logic system. This paper presents various computational intelligence and hybrid models for feature selection and classification of real bioinformatics datasets. The performance and classification accuracy of the presented models are measured using well known bioinformatics datasetsfrom the machine learning repository at University of California Irvine. Empirical results have shown that the proposed hybrid models outperform earlier models with better classification accuracy. ©2013 CRL Publishing Ltd.

关键词： Bioinformatics

来源：评论

学校读者我要写书评

暂无评论

Discrete-time sliding mode direct power control for three-phase grid connected multilevel inverter

Discrete-time sliding mode direct power control for three-ph...

引用

2013 4th International Conference on Power engineering, Energy and Electrical Drives, POWERENG 2013

作者： Huseinbegović, Senad Peruničić-Draženović, Branislava Department of Automatic Control and Electronics Faculty of Electrical Engineering University of Sarajevo Sarajevo Bosnia and Herzegovina

ISBN: (纸本)9781467363921

This paper presents a novel Direct Power control strategy for a three-phase grid connected multilevel inverter. The proposed DPC strategy combines discrete-time sliding mode control and predictive control. The active and reactive power are directly controlled by inverter switching states, represented by a switching vector, using the value of the power error computed from samples of phase voltages and currents. An appropriate switching vector is selected for each sampling period to minimize average value of the switching functions on the time interval on three sampling periods. The prediction of phase voltages and currents is necessary for algorithm implementation. The switching frequency is constant, and the digital control implementation is simple. The designed control system is tested using a simulation model of a three-level neutral-point clamped multilevel inverter. Simulation results confirm the design aims. © 2013 IEEE.

关键词： Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

A New Challenge in Ecological Process control Based on PLCs with Profinet Communication Protocol

A New Challenge in Ecological Process Control Based on PLCs ...

引用

International Conference on control systems and Computer Science (CSCS)

作者： Alexandru Dumitrascu Dan Stefanoiu Ionut Tomita Department of Automatic Control and System Engineering Automatic Control and Computers Faculty University Politehnica of Bucharest Romania Asti Automation SRL Bucharest Romania

ISBN: (纸本)9781467361408

The current situation of environmental resources requires their efficient usage through efficient process control. But, process control can not be achieved without an essential component: the communication between all devices, such as sensors, controllers, actuators, programming stations etc. The aim is to achieve the irrigation process of plants in greenhouse conditions. Therefore, it is submitted a comprehensive application that proposes to be a distributed control system including data acquisition and processing, both local and remote monitoring of the process parameters. The distributed system is based on modern equipment: Siemens Simatic PLCs and HMI, Memsic e̅Ko Pro wireless sensors network, level sensors for irrigation tanks and actuators such as on/off valves and pumps. In terms of communication between equipments, an industrial bus and protocols were used - Profinet and wireless communication. The software part is provided by TIA Portal with STEP 7 and WinCC flexible RT and LOGO! Soft Comfort for programming the automation devices. ModbusTCP was used to develop the communication protocol between central devices.

关键词： Sensors Irrigation Process control Green products Wireless sensor networks Monitoring control systems

来源：评论

学校读者我要写书评

暂无评论

Improving adaptive feedforward vibration compensation by using "integral+Proportional" adaptation

Improving adaptive feedforward vibration compensation by usi...

引用

作者： Airimiţoaie, Tudor-Bogdan Landau, Ioan Doré Control Systems Department GIPSA-lab CNRS St. Martin d'Héres 38402 France Faculty of Automatic Control and Computers University Politehnica of Bucharest Bucharest 060042 Romania

Analysis of various adaptive feedforward vibration compensation schemes has shown that a strictly positive real (SPR) condition has to be satisfied in order to guarantee the stability of the whole system (Jacobson, Johnson, Cormick, & Sethares, 2001;Landau, Airimiţoaie, & Alma, 2011a;Landau, Alma, & Airimiţoaie, 2011b;Wang & Ren, 1999). Filters have to be implemented in order to satisfy this condition. The problem becomes even more crucial in the presence of the internal mechanical coupling between the compensator system and the reference source (a correlated measurement with the disturbance) since some information is not available when adaptation starts (see Landau et al., 2011b). It is therefore very important to relax the SPR condition at least in the initial phase, and in the same time to improve the adaptation transients. It is shown, in this paper, that adding a proportional adaptation to the standard integral type parametric adaptation, the SPR condition can be relaxed and the adaptation transients are improved. Theoretical developments are enhanced by real time experimental results obtained on an active vibration control (AVC) system. © 2013 Elsevier Ltd. All rights reserved.

关键词： Vibration analysis

来源：评论

学校读者我要写书评

暂无评论

Quadriceps muscle models using fuzzy logic and ANFIS

Quadriceps muscle models using fuzzy logic and ANFIS

引用

2013 IEEE 3rd International Conference on system engineering and Technology, ICSET 2013

作者： Salleh, S.M. Jailani, R. Tokhi, M.O. Neuromuscular Rehabilitation Research Group Faculty of Electrical Engineering Universiti Teknologi MARA 40450 Shah Alam Selangor Malaysia Department of Automatic Control and System Engineering University of Sheffied United Kingdom

ISBN: (纸本)9781479910304

This paper presents a development of quadriceps muscle models using ANFIS and Fuzzy Logic based on Functional Electrical Stimulation (FES). The models inputs parameter consists of stimulation frequency, pulse width, and sampling time are used to predict quadriceps output torque. The muscle models developed are then validate with the clinical data to evaluate the accuracy of the torque output predicted with the identified parameters. In this study, Fuzzy Logic muscle model gives better performance representing quadriceps muscle model. © 2013 IEEE.

关键词： Computer circuits

来源：评论

学校读者我要写书评

暂无评论

A novel adaptive spiral dynamic algorithm for global optimization

A novel adaptive spiral dynamic algorithm for global optimiz...

引用

2013 13th UK Workshop on Computational Intelligence, UKCI 2013

作者： Nasir, A.N.K. Tokhi, M.O. Sayidmarie, O. Raja Ismail, R.M.T. Department of Automatic Control and Systems Engineering University of Sheffield Sheffield United Kingdom Faculty of Electrical and Electronics Engineering Universiti Malaysia Pahang Malaysia

ISBN: (纸本)9781479915682

This paper presents a novel adaptive spiral dynamic algorithm for global optimization. Through a spiral model, spiral dynamic algorithm has a balanced exploration and exploitation strategy. Defining suitable value for the radius and displacement in its spiral model may lead the algorithm to converge with high speed. The dynamic step size produced by the model also allows the algorithm to avoid oscillation around the optimum point. However, for high dimension problems, the algorithm may easily get trapped into local optima. This is due to the incorporation of a constant radius and displacement in the model. In order to solve the problem, a novel adaptive formulation is proposed in this paper by varying the radius and displacement of the spiral model. The proposed algorithm is validated with various dimensions of unimodal and multimodal benchmark functions. Furthermore, it is applied to parameter optimization of an autoregressive with exogenous terms dynamic model of a flexible manipulator system. Comparison with the original spiral dynamic algorithm shows that the proposed algorithm has better accuracy. Moreover, the time domain and frequency domain responses of the flexible manipulator model shows that the proposed algorithm outperforms its predecessor algorithm. © 2013 IEEE.

关键词： Dynamic models

来源：评论

学校读者我要写书评

暂无评论

Direct and indirect adaptive regulation strategies for rejection of time varying narrow band disturbances applied to a benchmark problem

Direct and indirect adaptive regulation strategies for rejec...

引用

European control Conference (ECC)

作者： Tudor-Bogdan Airimiţoaie Abraham Castellanos Silva Ioan Doré Landau Faculty of Automatic Control and Computers University “Politehnica” of Bucharest Bucharest ROMANIA Control system department of GIPSA-lab FRANCE

ISBN: (纸本)9781479901890

The paper will compare the performances which can be obtained using a direct adaptive regulation scheme based on the Youla-Kučera (YK) parametrization of the controller and using an adaptive finite impulse response (FIR) filter for implementing the internal model of the disturbance with a new indirect adaptive regulation scheme. The main features of this new scheme are: (i) the use of adaptive Band-stop Filters (BSFs) tuned at the frequencies of the disturbance instead of the Internal Model Principle (IMP) and (ii) a procedure for direct identification of frequencies contained in the disturbance. The use of adaptive BSFs allows to introduce the desired attenuation of the disturbance (instead of total rejection) and allows to get a much better shaping of the output sensitivity function (to meet the specification for the tolerated amplification outside the frequencies of the disturbance). The two approaches are comparatively evaluated on the benchmark simulator and on the benchmark active vibration control system.

关键词： Attenuation Benchmark testing Polynomials Mathematical model Sensitivity Adaptation models

来源：评论

学校读者我要写书评

暂无评论

Robust optimization-based control of constrained linear discrete time systems with bounded disturbances

Robust optimization-based control of constrained linear disc...

引用

5th IFAC Symposium on system Structure and control, SSSC 2013

作者： Nguyen, H.-N. Gutman, P.-O. Olaru, S. Hovd, M. Faculty of Civil and Environmental Engineering Technion - Israel Institute of Technology Israel Automatic Control Department France Department of Engineering Cybernetics Norwegian University of Science and Technology Norway

ISBN: (纸本)9783902823250

In this paper we consider robust control of discrete-time linear time-invariant systems affected by bounded additive disturbance inputs with state and control constraints. The method is based on an interpolation technique between several local unconstrained robust optimal controllers. At each time instant a quadratic programming (QP) problem is solved on-line. Proofs of recursive feasibility and input-to-state stability of the closed loop are provided. © 2013 IFAC.

关键词： Robust control

来源：评论

学校读者我要写书评

暂无评论

Implicit improved vertex control for uncertain, time-varying linear discrete-time systems with state and control constraints

Implicit improved vertex control for uncertain, time-varying...

引用

作者： Nguyen, Hoai-Nam Gutman, Per-Olof Olaru, Sorin Hovd, Morten Faculty of Civil and Environmental Engineering Technion - Israel Institute of Technology Israel Automatic Control Department France Department of Engineering Cybernetics Norwegian University of Science and Technology Norway

The problem of regulating an uncertain and/or time-varying linear discrete-time system with state and control constraints to the origin is addressed. It is shown that feasibility and a robustly asymptotically stable closed loop can be achieved using an interpolation technique. The design method can be seen as an alternative to optimization-based control schemes such as Robust Model Predictive control. Especially for problems requiring complex calculations to find the optimal solution, the present method can provide a straightforward suboptimal solution. A simulation demonstrates the performance of this class of constrained controllers. © 2013 Elsevier Ltd. All rights reserved.

关键词： Linear programming

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：