检索结果-内蒙古大学图书馆

RESEARCH AND EDUCATION IN robotics AND MANUFACTURING systems

robotics AND computer-INTEGRATED MANUFACTURING 1992年第1期9卷 1-1页

作者： JAMSHIDI, M Guest Editor AT&T Professor & Director CAD Laboratory for Systems|Robotics Department of Electrical & Computer Engineering University of New Mexico Albuquerque NM 87131 U.S.A.

来源：评论

学校读者我要写书评

暂无评论

Joint detection/estimation for modal order selection in Gaussian and nonGaussian noise

Joint detection/estimation for modal order selection in Gaus...

引用

MILCOM, Military Communications Conference

作者： S.C.A. Thomopoulos T.W. Hilands Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA Applied Research Laboratory Pennsylvania State University University Park PA USA

The authors present a general approach to determining the number of sinusoids present in measurements corrupted by additive white Gaussian and nonGaussian noise. The approach involves the simultaneous application of maximum a posteriori detection and nonlinear estimation using either the extended Kalman filter when the noise is Gaussian, or the extended high order filter when the noise is nonGaussian. The problem is formulated as a multiple hypothesis testing problem with assumed known a priori probabilities for each hypothesis. The advantage of the approach lies in the potential to accommodate time-varying as well as time-invariant parameters in the measurement model. Experimental evaluation of the approach demonstrates excellent performance in selecting the correct model order and estimating the system parameters even for signal-to-noise ratios as low as -5 dB.< >

关键词： Gaussian noise State estimation Noise measurement Autocorrelation Matrix decomposition Recursive estimation control systems Additive noise Additive white noise Application software

来源：评论

学校读者我要写书评

暂无评论

Nonlinear adaptive detection/estimation for single and multiple radar processing

Nonlinear adaptive detection/estimation for single and multi...

引用

MILCOM, Military Communications Conference

作者： S.C.A. Thomopoulos T.W. Hilands Department of Electrical and Computer Engineering Decision and Control Systems Laboratory Pennsylvania State University University Park PA USA Applied Research Laboratory Pennsylvania State University University Park PA USA

A nonlinear adaptive detector/estimator is introduced for single and multiple radar data processing. The problem of target detection from returns of monostatic radar(s) is formulated as a nonlinear joint detection/estimation problem on the unknown parameters in the signal return. The problems of detecting the target and estimating its parameters are considered jointly. A bank of spatially and temporally localized nonlinear filters is used to estimate the a posteriori likelihood of the existence of the target in a given space-time resolution cell. Within a given cell, the localized filters are used to produce refined spatial estimates of the target parameters. A decision logic is used to decide on the existence of a target within any given resolution cell based on the a posteriori estimates obtained from the likelihood functions. Simulation results show excellent detection capabilities and excellent resolution in target parameter estimation for both single and multiple sensor data.< >

关键词： Radar detection Spatial resolution Parameter estimation Detectors Data processing Object detection Nonlinear filters Signal resolution Refining Logic

来源：评论

学校读者我要写书评

暂无评论

Nonlinear filtering methods for harmonic retrieval

Nonlinear filtering methods for harmonic retrieval

引用

MILCOM, Military Communications Conference

作者： T.W. Hilands S.C.A. Thomopoulos Applied Research Laboratory Pennsylvania State University University Park PA USA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

The authors address the problem of high-resolution parameter estimation of superimposed sinusoids using nonlinear filtering techniques. Six separate nonlinear filters are evaluated for the estimation of the parameters of sinusoids in white and colored Gaussian noise. Experimental evaluation demonstrates that the nonlinear filters perform very satisfactorily (close to the Cramer-Rao bound) for reasonable values of the initial estimation error. A major advantage of using nonlinear filtering methods for harmonic retrieval is that the filters can be applied to time-varying process models as well.< >

关键词： Filtering Power harmonic filters Nonlinear filters Noise measurement Parameter estimation Equations Gaussian noise Frequency estimation Damping White noise

来源：评论

学校读者我要写书评

暂无评论

Sufficient Conditions for the Robust Stability of systems with Multiaffine Parameter Dependence

引用

IFAC Proceedings Volumes 1992年第21期25卷 168-171页

作者： B.D.O. Anderson F.J. Kraus M. Mansour S. Dasgupta Department of Systems Engineering Research School of Physical Sciences and Engineering Australian National University GPO Box 4 Canberra ACT 2601 Australia. Automatic Control Laboratory ETH Zurich 8092 Zürich Switzerland Department of Electrical & Computer Engineering University of Iowa Iowa City lA 52242 USA.

A number of robust stability problems take the following form: A polynomial has real coefficients wvhich are multiaffine in real parameters that are confined to a box in parameter space. An efficient method is required for checking the stability of this set of polynomials. We present two sufficient conditions in this paper. They involve: checking certain properties at the corners and edges of the parameter space box.

关键词： Robust Stability Multiaffine Parameter Dependence

来源：评论

学校读者我要写书评

暂无评论

Visual pattern recognition using morphological methods

Visual pattern recognition using morphological methods

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： I.N.M. Papadakis J.G. Reisman S.C.A. Thomopoulos Dept. of Electr. & Comput. Eng. Pennsylvania State Univ. University Park PA USA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering Pennsylvania State University University Park PA USA

An effective method for visual pattern recognition using morphological techniques is presented. It is shown that it can be successfully used for the recognition of deformed letters. The method extracts morphological information by the successive dilation of an idealized letter set. At each stage a properly defined similarity index is computed. The maximum values of the similarity index for each stored letter are compared and are used for the classification decision. Classification results are presented for a set of deformed capital English letters with a realistic level of deformation. Skeletonization of the deformed pattern is shown to improve the performance of the classification method. The described method can be easily implemented using a parallel architecture.< >

关键词： Pattern recognition Artificial neural networks Feature extraction Clocks control systems Laboratories Data mining Parallel architectures Character recognition Tiles

来源：评论

学校读者我要写书评

暂无评论

Harmonic insertion in PWM inverter drive schemes

引用

European Transactions on electrical Power 1992年第3期2卷 143-151页

作者： Theocharis, J. Petridis, V. Dr.-Ing. John Theocharis (1956) graduated as an Electrical Engineer from Aristotelian University of Thessaloniki.Greece in 1980. From 1980 to 1985 he has been with the scientific staff of the Department of Electrical Engineering at the Aristotelian University where he received the Ph.D. degree in 1985. Since 1986 he is working as a lecturer and in 1990 he became assistant professor at the Department of Electronics and Computer Engineering in the m e university. His research activities include control power electronics and electrical motor drives. Recently he is working with the Neural Network Systems with applications to field oriented control problems. Aristotelian University of Thessaloniki School of Engineering Faculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438 GR-Thessalonikil/Greece.T+3131/219784Fax + 3031/274868) Prof. Dr.-Ing. Vasilis Petridis (1946) graduated from National Technical University of Athens Greece in 1969.He obtained the M.Sc. and the Ph.D. in electronics and systems from the University of London in 1970 and 1974. respectively. H i s interests include applied automatic control neural networks drives dynamic systems robotics etc. He is currently professor in the Department of Electronics and Computer Engineering of the University of Thessaloniki. (Aristotelian University of Thessaloniki. School of EngineeringFaculty of Electrical Engineering Dept. of Electronics & Computer Engineering P.O. Box 438. GR-ThessaloniW Greece T+3031/219784.Fax+3031/274868)

The procedure of harmonic insertion is generalized in this paper. Analytical expressions of the voltage spectra are derived. The insertion of the 3rd harmonic to the modulating signal, which is of particular interest, is considered as a special case. It is demonstrated in this case that the fundamental harmonic component of the phase and the line‐to‐line voltage is not affected by the insertion of the 3rd harmonic for sufficiently high values of the chopping ratio. However it has been shown that the higher harmonic spectrum is significantly improved as compared to the case of pure sinusoidal modulation. For different values of the fundamental component the optimal values of the amplitude of the third harmonic to be inserted have been calculated so that the distortion factor of the higher harmonic spectrum is minimized. Other cases of harmonic insertion are also considered which provide spectrum efficiency improvement. Experimental results are given which have been obtained by means of a microcomputer controlled PWM generator constructed for this purpose. Copyright © 1992 John Wiley & Sons, Ltd.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A CERTAINTY EQUIVALENCE PRINCIPLE BASED NONLINEAR SEPARATION control RULE FOR RANDOM-ACCESS CHANNELS - STABILITY AND DELAY ANALYSIS

引用

INFORMATION SCIENCES 1991年第1-3期56卷 75-111页

作者： THOMOPOULOS, SCA Decision and Control Systems Laboratory Department of Electrical and Computer Engineering The Pennsylvania State University University Park Pennsylvania 1680 USA

Application of the certainty equivalence principle in the dynamic control problem of an unstable random access (RA) channel results in a nonlinear separation control rule which can be implemented in a decentralized fashion and yields maximum stable throughout e-1. Stability of the controlled RA channel is proven by showing that the channel backlog and its least squares estimate from an ergodic double Markov chain. Tight upper and lower bounds on the invariant probability distribution are also derived when the backlog is precisely known. The bounds are loglinear functions of the channel backlog and can be readily used to compute bounds on the average backlog and delay in the RA channel. An adaptive realization of the control is introduced for an RA channel with unknown traffic rates. Extensive simulation results are provided and the performance of our control is compared with other existing distributed controls.

关键词： Data Transmission

来源：评论

学校读者我要写书评

暂无评论

Model Reference Adaptive control of a Gantry Crane Scale Model

引用

IEEE control systems 1991年第1期11卷 57-62页

作者： Butler, Hans Honderd, Ger Van Amerongen, Job Control Laboratory of the Department of Electrical Engineering Delft University of Technology 2600 GA Delft Netherlands Control Systems and Computer Engineering Laboratory Department of Electrical Engineering University of Twente 7500 AE Enschede Netherlands

A method of reference model decomposition, an extension of model reference adaptive control, is presented. The decomposition method can be regarded as a way of including knowledge about the structure and parameters of unmodeled dynamics in the adaptive system, making it possible to choose a lower order controller which is only equipped for the nominal process part. To illustrate the decomposition method, an adaptive controller for a scale model of a gantry crane is presented. Simplifying and linearizing the mathematical equations describing the crane yields a fourth-order model, of which the dynamics of the load swing take two. A standard adaptive control algorithm needs eight parameters, which in practice yields unacceptable behavior. The decomposition method allows the use of only two adjustable parameters, and real-time experiments showing practical results obtained with the method are described.< >

关键词： Adaptive control Cranes Programmable control Equations Mathematical model Laboratories Adaptive systems control systems Flexible structures Industrial control

来源：评论

学校读者我要写书评

暂无评论

Survey of Robust control for Rigid Robots

引用

IEEE control systems 1991年第2期11卷 24-30页

作者： Abdallah, C. Dorato, P. Jamshidi, M. Dawson, D. CAD Laboratory for Systems and Robotics Electrical and Computer Engineering Department University of New Mexico Albuquerque NM 87131 United States Department of Electrical and Computer Engineering Clemson University Clemson SC 29634-0915 United States

This survey discusses current approaches to the robust control of the motion of rigid robots and summarizes the available literature on the subject. The five major designs discussed are the “Linear-Multivariable” approach, the “Passivity” approach, the “Variable-Structure” approach, the “Saturation” approach and the “Robust-Adaptive” approach. © 1991 IEEE

关键词： Robust control Robot kinematics Adaptive control Programmable control control systems Robot control Equations Robustness Uncertainty Lagrangian functions

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：