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 require...
详细信息
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.
作者：
B.R. MeijerJ. StigterControl Laboratory
Department of Electrical Engineering Delft University of Technology P.O. Box 5031 NL 2600 GA Delft The Netherlands Knowledge Based System Group
Department of Technical Mathematics and Informatics Delft University of Technology Julianalaan 132 NL 2628 BC Delft The Netherlands
A flexible assembly cell is considered to be an essential building brick for flexible automation of small to medium sized order-based industries. In order to be able to respond adequately to market changes a productio...
详细信息
A flexible assembly cell is considered to be an essential building brick for flexible automation of small to medium sized order-based industries. In order to be able to respond adequately to market changes a production facility that can be reprogrammed or even reconfigured in a very short time is vital. Such a system will have to exhibit some form of intelligent behavior. By intelligent behavior we mean that this system should be able to learn from experience. The experience gained in making subsequent batches of products will be used to increase the efficiency of future batches. Unreliable strategies will be replaced by more reliable ones, actual time data will make it possible to choose a better plan. In this paper a reference model for planning, control and error management for a flexible assembly cell is presented and scheduling and a cost function for the selection of strategies for primitive operations are discussed.
作者：
B.R. MeijerJ. StigterControl Laboratory
Department of Electrical Engineering Delft University of Technology P.O. Box 5031 NL 2600 GA Delft The Netherlands Knowledge Based System Group
Department of Technical Mathematics and Informatics Delft University of Technology Julianalaan 132 NL 2628 BC Delft The Netherlands
A flexible assembly cell is considered to be an essential building brick for flexible automation of small to medium sized order-based industries. In order to be able to respond adequately to market changes a productio...
详细信息
A flexible assembly cell is considered to be an essential building brick for flexible automation of small to medium sized order-based industries. In order to be able to respond adequately to market changes a production facility that can be reprogrammed or even reconfigured in a very short time is vital. Such a system will have to exhibit some form of intelligent behavior. By intelligent behavior we mean that this system should be able to learn from experience. The experience gained in making subsequent batches of products will be used to increase the efficiency of future batches. Unreliable strategies will be replaced by more reliable ones, actual time data will make it possible to choose a better plan. In this paper a reference model for planning, control and error management for a flexible assembly cell is presented and scheduling and a cost function for the selection of strategies for primitive operations are discussed.
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,...
The concept of extended linearisation for nonlinear control design yields control systems for which the linearisations have eigenvalues independent of the operating point. The computations of the procedure is complica...
详细信息
The concept of extended linearisation for nonlinear control design yields control systems for which the linearisations have eigenvalues independent of the operating point. The computations of the procedure is complicated. There are systems where the parameterisation of the operating points by the input cannot be directly applied. A novel method of parameterisation of the operating point which overcomes these disadvantages is proposed. Its effectiveness is proved by application to the stabilisation of a synchronous generator, which is a problem of great importance in power systems control. The results are compared with conventional control using a linear pole-placing controller. The robustness of the proposed nonlinear control is also considered.
The paper presents a new approach to non-linear adaptive control for power systems using the properties of the degree of stability and the Lyapunov function. Sufficient conditions are derived for the existence of a st...
详细信息
The paper presents a new approach to non-linear adaptive control for power systems using the properties of the degree of stability and the Lyapunov function. Sufficient conditions are derived for the existence of a stabilizing adaptive control law given a non-linear varying system. These conditions are in terms of the controller parameters and apply to systems in which the parameters are not all known. Thus, the control law obtained is implemented by purely local feedback. The stability of the system with the adaptive control is illustrated by the results of a simulation of a single-machine system model.
While a cutting tool is cutting a workpiece at various cutting depths, it goes through a nonlinear time-varying process. The stability of the turning force control system in this process can not be assured by the clas...
详细信息
While a cutting tool is cutting a workpiece at various cutting depths, it goes through a nonlinear time-varying process. The stability of the turning force control system in this process can not be assured by the classical control theory. In this paper, the force control system is considered to be a linear one with a nonlinear time-varying perturbation. Using the functional analysis and Bellman-Gronwall inequality, a simple robust stability criterion is derived from the state space approach. For the simplicity of implementation, the PI controller is employed to treat this stabilization problems, whose design procedure for specifying the control parameters is also proposed according to the robust stability criterion. The illustrative results of the computer simulation and practical experiments show that the control parameters, obtained by the design procedure, show better output responses than other control parameters in gain space.
A typical optical fibre system for image transmission consists of a light-source illuminating device, a pick-up camera system and a signal processing and output system. Since the pick-up cameras on the market vary gre...
详细信息
In this paper we consider the problem of comparing 2 SISO noise corrupted input-output data records and trying to decide if they were produced by the same linear dynamic system or not. We propose to use a likelihood r...
详细信息
In this paper we consider the problem of comparing 2 SISO noise corrupted input-output data records and trying to decide if they were produced by the same linear dynamic system or not. We propose to use a likelihood ratio test statistic based on the BLUE’s of the parameters of the dynamic systems for the resultant hypothesis testing problem. For the case of Gaussian distributed additive noise disturbances on the output data, we examine the power of the critical region for this statistic and relate it to the signal to noise ratio for the data. We then show how a reduced order estimator may be intelligently chosen and applied to one of the data records in order to derive a test statistic with more powerful critical region, so that for a given false alarm rate, less true faults will be missed. A simulation example illustrating the efficacy of these approaches concludes the paper.
Deals with graphic simulation of the dynamics and motion of robot manipulators implemented on a Sun workstation. The graphics work was limited to 2D models, using a skeleton or spine drawing technique to represent the...
详细信息
Deals with graphic simulation of the dynamics and motion of robot manipulators implemented on a Sun workstation. The graphics work was limited to 2D models, using a skeleton or spine drawing technique to represent the arm. The plotting and mapping of the graphics utilizes the homogeneous transformation matrices which contain information on the position and orientation of manipulator links. The organization and interpretation of plotting, the direct use of the homogeneous transformation matrices and manipulator Jacobian in relating joint coordinate to Cartesian coordinate, and the structure of graphics display are discussed. The simulation program was arranged to form a user-friendly package. It includes inverse and forward kinematics and dynamics, as well as an adaptive control procedure. A dynamics analysis and control facility was implemented, which is an extension to currently available robot graphics simulation packages.< >
暂无评论