control systems can be viewed as dynamical systems over (infinite) dimensional state spaces. from this point of view the long term behavior of control systems, such as limit sets, Morse sets, approximations on the ent...
详细信息
ISBN:
(纸本)0080419011
control systems can be viewed as dynamical systems over (infinite) dimensional state spaces. from this point of view the long term behavior of control systems, such as limit sets, Morse sets, approximations on the entire time axis, ergodicity, Lyapunov exponents, stable and unstable manifolds etc. becomes accessible. This paper presents some of the underlying theory, as well as applications to the global characterization of control systems with bounded control range that are not completely controllable, to control of chaotic systems, and to exponential stability of uncertain systems.
Dynamic systems, which occur in numerous engineering applicationsfrom navigation systems to communication and control systems, are often represented in the form of continuous-time differential equation models. Freque...
详细信息
Dynamic systems, which occur in numerous engineering applicationsfrom navigation systems to communication and control systems, are often represented in the form of continuous-time differential equation models. Frequently these continuous-time models have time-varying coefficients or nonlinear effects. These conditions have traditionally posed problems for most of the existing digital implementation and simulation procedures. However, by directly implementing the analog model in its natural modular form, these problems can often be handled with much less effort. In this paper some promising techniques are investigated for the direct digital implementation of analog prototype models which may contain nonlinear or time varying parameters.
In the paper, the problem of designing full-order observers for multivariable bilinear control systems is transformed into a nonlinear constrained optimisation problem. It is shown that an appropriate choice of the ob...
详细信息
In the paper, the problem of designing full-order observers for multivariable bilinear control systems is transformed into a nonlinear constrained optimisation problem. It is shown that an appropriate choice of the objective function, based on an exponentially decaying bound on the norm of the observer error, together with the selection of a suitable set of constraints, ensures that the solution of the transformed problem, not only satisfies the usually desired design criterion of global asymptotic stability of the observer error dynamics, but it can also yield observers with near-optimum rate of decay of the error norm. These findings are confirmed in results presented from a graphically supported numerical computer package for automatic design and display of the near-optimal stable observer trajectories in the bivariate case.
A range of methodologies which are currently used in the development of computer aided control system design procedures for nonlinear systems is surveyed and the facilities available in a number of mature packages are...
详细信息
A range of methodologies which are currently used in the development of computer aided control system design procedures for nonlinear systems is surveyed and the facilities available in a number of mature packages are outlined. Future trends are indicated which include the evolution of comprehensive integrated packages and the use of expert systems to assist the user.
CAD software for control system is presented. For the practical use, the data processing of actual processes is essential. Parameter tuning and adaptation for nonlinearity and historical change is discussed. A simulat...
详细信息
CAD software for control system is presented. For the practical use, the data processing of actual processes is essential. Parameter tuning and adaptation for nonlinearity and historical change is discussed. A simulation case study is useful for the analysis and design of actual processes because multivariable interaction and nonlinear behavior exist commonly and those characteristics cannot be theoretically analysed.
A 500 MW unit superheater temperature control loop structure and parameter design using a state-space based CADCS package STAFCON is described. Special control loop structure with disturbance generator model is develo...
详细信息
A 500 MW unit superheater temperature control loop structure and parameter design using a state-space based CADCS package STAFCON is described. Special control loop structure with disturbance generator model is developed to increase disturbance compensation capabilities. Simulation results and brief STAFCON system description are also given.
An interactive computer aided design suite has been used in the development of nonlinearcontrol algorithms for a practical nonlinear system. In particular, variable structure controllers have been designed for use on...
详细信息
An interactive computer aided design suite has been used in the development of nonlinearcontrol algorithms for a practical nonlinear system. In particular, variable structure controllers have been designed for use on two joints of a robot manipulator having nonlinear friction in the drive mechanism. The implementation of these controllers results in significant improvements over the manufacturer's PID controller for both continuous path and point to point motion.
The contribution of this paper is to propose a new design method and a nonlinear optimal control law which are based on the new achievements of differential geometric theory for excitation control of multimachine syst...
详细信息
The contribution of this paper is to propose a new design method and a nonlinear optimal control law which are based on the new achievements of differential geometric theory for excitation control of multimachine systems. The model of a multimachine system is set up as an affine nonlinear equation set, which is defined on a manifold M. The control strategy obtained for each individual generator is not only an optimal one but also a decoupled law. The stability of the global multimachine system with the control law and the engineering realization problem of the new control scheme are discussed. And the results of simulation to a six-machine system are quite convincing.
The CACSD (Computer-Aided control System design) system needs to evolve in order to provide many current design. Methods and keep up with the progress of theory and computers. First, it is pointed out that CACSD syste...
详细信息
The CACSD (Computer-Aided control System design) system needs to evolve in order to provide many current design. Methods and keep up with the progress of theory and computers. First, it is pointed out that CACSD systems should have four features: algorithm independency, macro capability, consultation facilities and refined human interface. Then, we have an idea of a desirable structure with which CACSD systems must be realized and an overview of the CACSD system which we have developed, based on the idea of evolution. This system has seven modules: block diagram graphic editor, matrix editor, classical controldesign, modern controldesign, nonlinear simulation, evaluation facilities and consultation facilities. Our CACSD system has been successfully applied in many fields and we have confirmed that evolving features are very effective for developing and using CACSD systems.
SIMNUM is a CAD package for the synthesis and the simulation of linear, continuous or discrete-time, control systems, in state space representation. It allows the design of a state-variable feedback by pole placement ...
详细信息
SIMNUM is a CAD package for the synthesis and the simulation of linear, continuous or discrete-time, control systems, in state space representation. It allows the design of a state-variable feedback by pole placement for single input systems (theorem of Ackermann) or multivariable systems (simplified version of the method of Roppenecker) both of continuous or discrete type, and by finite setting-time design (dead-beat control) for the discrete case, and of three kinds of observers: identity, reduced order (methods of Luenberger, or of Celentano and Balestrino) and functionnal (method of Becker and Hanselmann). The duality between estimation and control has been used extensively throughout the package, and serves for the demonstration of the simplified algorithm used for the multivariable pole-placement design. It is also shown that this algorithm contains, as a special case, the well known formula of Ackermann. Time responses can be calculated for the open or closed loop system, with or without an observer included in the loop. Usual non-linearities and quantization effects can be taken into account. This package is written in FORTRAN 77 and runs presently on an HP 1000 microcomputer and on IBM-PC compatibles, with CGA or EGA displays.
暂无评论