检索结果-内蒙古大学图书馆

Particle Filter Approach to Nonlinear System Identification under Missing Observations with a Real Application

IFAC Proceedings Volumes 2009年第10期42卷 810-815页

作者： R.Bhushan Gopaluni Thomas B. Schön Adrian G. Wills Department of Chemical and Biological Engineering University of British Columbia Vancouver Canada V6T 1Z3 (Tel: 604 827 5668 Division of Automatic Control Linköping University SE-581 83 Linköping Sweden School of Electrical Engineering and Computer Science University of New Castle Australia

This article reviews authors’ recently developed algorithm for identification of nonlinear state-space models under missing observations and extends it to the case of unknown model structure. In order to estimate the parameters in a state-space model, one needs to know the model structure and have an estimate of states. If the model structure is unknown, an approximation of it is obtained using radial basis functions centered around a maximum a posteriori estimate of the state trajectory. A particle filter approximation of smoothed states is then used in conjunction with expectation maximization algorithm for estimating the parameters. The proposed approach is illustrated through a real application.

关键词： Nonlinear Systems Maximum Likelihood Parameter Estimation Expectation Maximization Particle Filters

来源：评论

学校读者我要写书评

暂无评论

Sensor and actuator fault detection and diagnosis based on morphology-wavelet

Sensor and actuator fault detection and diagnosis based on m...

引用

IEEE International Symposium on Industrial Electronics (ISIE)

作者： Yi Zhang Guolian Hou Yuanyuan Li Jingang Xu College of Light Industry Hebei Polytechnic University Tangshan China Department of Automation North China Electric Power University Beijing China Department of information engineering Shijiazhuang University of Economics Hebei China College of Computer and Automatic Control Hebei Polytechnic University Tangshan China

The paper described a structure of three modules diagnosis system for detecting and identifying faults that occur in the sensor and actuator of control systems with input and output signals related to the component itself. The diagnosis algorithm consists of three steps; firstly, generalized morphological filter with multi-structure elements is designed to filter the random noise and impulse noise in sensor's and actuator's input and output signals. And secondly, wavelet transform, which has been proposed for sensor's fault diagnosis some years ago, is developed for control system (sensor and actuator). To effectively extract the abruptly fault characteristic, a wavelet transform was used to analyze the filtered signals in this paper. By the multi resolution analyzing (MRA), the faults can be detected accurately. Thirdly, according to calculating the Lipschitz exponent (LE) at the fault's point, the fault type can be identified. The super-heated temperature control system has been studied. The effectiveness of the proposed approach is demonstrated by the means of experimental results and simulations.

关键词： Actuators Fault detection Fault diagnosis Sensor phenomena and characterization Sensor systems control systems Filters Multiresolution analysis Wavelet transforms Signal processing

来源：评论

学校读者我要写书评

暂无评论

Empirical analysis of the effect of parasitics and of reverse recovery as an amplitude error on distortion in a class D audio amplifier

Empirical analysis of the effect of parasitics and of revers...

引用

AFRICON Conference

作者： F. Koeslag H. du T. Mouton H.J. Beukes Faculty of Industrial and Mechanical Eng. Electronics Laboratory University of Oulu FINLAND Faculty of Electrical IT and Computer Eng. Islamic Azad University Qazvin Iran Department of Electronic Electrical and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain

An analysis of the effect of parasitics and reverse recovery on harmonic distortion in a class D audio amplifier is performed in this paper. The error sources under investigation are modelled empirically as an amplitude error, after which an existing strategy based on Newton's numerical method is implemented to simulate its effect within the audible band. The results are compared to existing timing errors to determine its degree of dominance.

关键词： Inductors Performance analysis Harmonic distortion MOSFET circuits Power semiconductor switches Frequency Voltage control Harmonic analysis Timing Total harmonic distortion

来源：评论

学校读者我要写书评

暂无评论

Droop based control of parallel-connected single-phase inverters in D-Q rotating frame

Droop based control of parallel-connected single-phase inver...

引用

IEEE International Conference on Industrial Technology (ICIT)

作者： Saeed Golestan Mahmood Joorabian Hasan Rastegar Arman Roshan Josep M. Guerrero Faculty of Electrical Engineering Amirkabir University of Technology슠 Tehran Iran Shahid Chamran University Ahvaz Iran Center of Power Electronics Systems Virginia Polytechnic Institute and State University Blacksburg VA USA Department of Automatic Control Systems Computer Engineering Universitat Poliltècnica de Catalunya Barcelona Spain

ISBN: (纸本)9781424435067

In this paper, control of parallel single-phase inverters in direct-quadrature(DQ) rotating frame based on droop method is proposed. For each inverter, a secondary orthogonal imaginary circuit is created to provide the second phase required for the transformation; thus a DQ model of the inverter is obtained. The DQ transformation provides a time-invariant model of the inverter which makes the control design similar to that of dc-dc converters. The recognition of this analogy is important in that all of advanced dc-dc converters control techniques that have been previously developed can be applied to the control parallel inverters. The controller then is designed in DQ frame. Theoretically, infinite loop gain can be achieved in DQ rotating frame resulting in the elimination of the steady state error at the fundamental frequency of the inverter. The output impedance of the inverters is also considered, to ensure the decoupling between active and reactive power control using droop method. Simulation results are provided to prove the concept.

关键词： Inverters Communication system control Circuits DC-DC power converters Uninterruptible power systems Power system reliability control systems control design Frequency Reactive power control

来源：评论

学校读者我要写书评

暂无评论

Swinging-Up and Stabilization control Based on Natural Frequency for Pendulum Systems

Swinging-Up and Stabilization Control Based on Natural Frequ...

引用

2009 American control Conference (ACC 2009)

作者： Noriko Matsuda Masaki Izutsu Jun Ishikawa Katsuhisa Furuta Karl J. Astrom Department of Computer and Systems Engineering Tokyo Denki University Ishizaka Hatoyama Saitama 350-0394 Japan Department of Advanced Multidisciplinary Engineering Tokyo Denki University Ishizaka Hatoyama Saitama 350-0394 Japan Tokyo Denki University 2-2 Nishiki Kanda Chiyoda Tokyo 101-8457 Japan Department of Automatic Control LTH Lund University Box 118 SE-221 00 Lund Sweden

ISBN: (纸本)9781424445233

This paper proposes a swinging-up and stabilization method for inverted pendulums based on a pendulum oscillation model. A normalized oscillation model is derived by using only one model parameter, i.e., the natural frequency of a pendulum. As a control strategy, energy-based control with a normalized energy model is utilized for the swinging-up from the pendant position. For the stabilization of the pendulum at the upright position, variable structure system (VSS) type adaptive control is designed through the linearized oscillation model. Validity of the proposed method has been confirmed by simulation of an inverted pendulum on a cart. Swinging-up and stabilization control was realized by using only the natural frequency of the pendulum, and the proposed method was also confirmed to be robust against parameter perturbation for the natural frequency. Stability of the designed controller was proven for a given condition that angular velocity of the pendulum has an upper bound.

关键词： control systems Frequency Variable structure systems Adaptive control Error correction Stability analysis Modeling Robust control Angular velocity control Angular velocity

来源：评论

学校读者我要写书评

暂无评论

Global automata: A new approach on modelling industrial systems

引用

International Journal of Industrial and Systems engineering 2008年第4期3卷 383-406页

作者： Deligiannis, Vasileios Manesis, Stamatis Lygeros, John Systems and Measurement Laboratory Department of Electrical and Computer Engineering University of Patras Rion-Patras 26500 Greece ETH Zurich Automatic Control Laboratory Physikstrasse 3 Zurich 8092 Switzerland

This paper introduces Global Automata as a new approach on modelling contemporary industrial systems. Global automata are based on automata philosophy and, as their name reveals, they constitute a super-set of existing automata types. Their implementation field is, therefore, wider in comparison with other available types. Their main characteristic is that they are especially oriented for industrial use. As regards to model architecture, they introduce new formulation parameters diversifying from conventional types, while they keep some common basic features. A formal definition of global automata is given as also two useful tools for system modelling, which are state aggregation and automata composition. Their use is illustrated with two representative industrial examples. © 2008, Inderscience Publishers.

关键词： Industrial engineering

来源：评论

学校读者我要写书评

暂无评论

Acoustic emission measurements of acoustically induced cavitation bubbles in insulating oils

Acoustic emission measurements of acoustically induced cavit...

引用

2008 IEEE International Conference on Dielectric Liquids, ICDL 2008

作者： Boczar, T. Szmechta, M. Zmarzly, D. Department of Electrical Engineering Automatic Control and Computer Science Opole University of Technology Prószkowska 76 45-758 Opole Poland

ISBN: (纸本)1424415853

Acoustic emission measurement results of acoustically induced cavitation bubbles in insulating oil are presented in this paper. Spectral analysis of acquired by a broadband transducer acoustic emission signals is proposed as a diagnostic tool for estimation of aging properties of mineral insulating oils. The article describes the main parts of the designed and built measurement apparatus used for acoustic cavitation investigation in insulating oils. In this note representative results of the experimental data taken from the apparatus are shown.

关键词： Cavitation

来源：评论

学校读者我要写书评

暂无评论

Dielectric properties of fullerene-doped hydrocarbons

Dielectric properties of fullerene-doped hydrocarbons

引用

2008 IEEE International Conference on Dielectric Liquids, ICDL 2008

作者： Zmarzly, D. Aksamit, P. Boczar, T. Opole University of Technology Department of Electrical Engineering Automatic Control and Computer Science ul. Prószkowska 76 45-758 Opole Poland

The paper presents the concept of modifying dielectric properties of hydrocarbons by the addition of C60 fullerenes. Streaming electrification current of pure and C60 doped toluene was examined using rotating electrom... 详细信息

ISBN: (纸本)1424415853

关键词： Dielectric properties

来源：评论

学校读者我要写书评

暂无评论

Measurements of distribution of streaming electrification current inside pipe

Measurements of distribution of streaming electrification cu...

引用

2008 IEEE International Conference on Dielectric Liquids, ICDL 2008

作者： Zmarzly, D. Boczar, T. Opole University of Technology Department of Electrical Engineering Automatic Control and Computer Science ul. Prószkowska 76 45-758 Opole Poland

ISBN: (纸本)1424415853

The paper presents streaming current distributions measured in an overflow system in both laminar and turbulent conditions. These distributions were taken using a shifting spherical electrode connected with electrometer. For lower values of Reynolds number the profile of current is parabolic. For higher values of Reynolds number the profile is flattened. In this paper also charge density distributions were determined in both cases. In the turbulent regime the volume charge density is distributed in the pipe more evenly compared with the laminar regime.

关键词： Reynolds number

来源：评论

学校读者我要写书评

暂无评论

Contourlet Based Interest Points Detector

Contourlet Based Interest Points Detector

引用

20th IEEE International Conference on Tools with Artificial Intelligence

作者： Saydam, Samer R. El rube', Ibrahim A. Shoukry, Amin A. CS Department Computing and Information Technology College AASTMT Egypt EC Eng. Dept. College of Engineering and Technology AASTMT Egypt Computer Science and Automatic Control Department Faculty of Engineering Alexandria University Egypt

ISBN: (纸本)9780769534404

This paper proposes a robust algorithm for detecting interest points based on the NonsubSampled Contourlet Transform (NSCT). The NSCT provides multiscale decomposition with directional filters at each scale. Furthermore, NSCT is very efficient in extracting the geometric information of images and therefore it has very good feature localization. The NSCT-based point detector is compared to the widely used Harris and Difference of Gaussian (DoG) interest point detectors. The experimental results reveal the robustness of the proposed algorithm to rotation, scale and viewpoint changes.

关键词： Interest point detection corner detector local features nonsubsampled contourlet transform (NSCT)

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：