摘要:

In Part 1 of this paper the concept of a bound for the output frequency response magnitude characteristics of nonlinear systems was proposed, and general calculation and analysis procedures were developed. In this, Part 2 of the paper, a new recursive algorithm for the computation of the gain bounds for the generalized frequency response functions of the polynomial nonlinear autoregressive model with exogenous input is proposed, and effective procedures for the practical computation of the new bound are developed. Simulated examples are included to verify the effectiveness of the proposed procedures.

ISSN:0020-7179    

DOI:10.1080/00207179608921702

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

In his 1868 paper on governors Maxwell discussed governors which made use of differential gears. However, his treatment was brief and cryptic. In the present paper Maxwell's argument is elucidated, corrected and expanded. Historical notes are added on the mechanical principles which form the basis of Maxwell's analysis.

ISSN:0020-7179    

DOI:10.1080/00207179608921703

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A modified variable structure controller is proposed to deal with the conirol chattering problem which is one of the major difficulties for implementing the variable structure control (VSC). The new control strategy is effective for a class of uncertain nonlinear dynamical systems. Based on a suitably designed sliding sector, a continuous switching controller whose control structure is switched, whereas the control signal at switching remains continuous, is constructed. The complete attractiveness and the stability properties of the sliding sector, in the sense of Lyapunov stability, ensure the retention of benefits achieved with the conventional VSC. Some typical examples are also investigated which show the improvement of system performance.

ISSN:0020-7179    

DOI:10.1080/00207179608921704

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A non-iterative method for the computation of the infimum for a class of discrete-timeH∞optimal control problems, and the solvability conditions for the general discrete-time disturbance decoupling problem are given in this paper. The method for the computation of the infimum is applicable to systems where the transfer functions from the disturbance input to the measurement output and from the control input to the controlled output are free of unit circle invariant zeros and satisfy certain geometric conditions. The solvability conditions we obtained for the general discrete-time disturbance decoupling problem are also necessary and sufficient conditions.

ISSN:0020-7179    

DOI:10.1080/00207179608921705

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The exact linearization of nonlinear control systems provides a useful method for designing feedback controllers based on the linear model in which the nonlinear plant is transformed. This paper deals with two drawbacks involved in this method when applied to trajectory tracking problems: the control must be bounded, and the evolution of the state variables must lie within a determined region of the state space. Conditions for fulfilling both constraints are given, and an application to a robot manipulator is shown.

ISSN:0020-7179    

DOI:10.1080/00207179608921706

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A number of techniques have been developed in recent years for the analysis and design of controllers which are robust with respect to structured complex uncertainty. In particular the complex μ synthesis procedure has been successfully applied to a number of engineering problems. However, the presence of real parametric uncertainty in the problem substantially complicates matters, so that standard complex μ synthesis techniques are no longer adequate. This paper develops a procedure to tackle the mixed (real and complex) μ synthesis problem. This procedure involves a (D, G)-K iteration between computing the mixed μ upper bound and solving anH∞optimal control problem. The resulting scheme has guaranteed convergence, though not necessarily to the global optimum of the (non-convex) problem. The (D, G)-K iteration has been implemented in software, and several controller designs are carried out and compared with the corresponding complex μ synthesis designs, to illustrate the advantages of the new technique.

ISSN:0020-7179    

DOI:10.1080/00207179608921707

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Discrete time positive systems have been the object of widespread interest in the literature. In the last decade particular attention has been devoted to the analysis and characterization of the different notions of reachability and controllability which, in this context, make their appearance. In this paper, the properties of (ordinary and essential) controllability and reachability are analysed. Based on a graph-theoretic approach, we provide practical criteria to verify whether a given positive system (F, G) is endowed with these properties, together with canonical forms for describing reachable/controllable pairs.

ISSN:0020-7179    

DOI:10.1080/00207179608921708

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

An alternative QFT framework is proposed for the design of multiple-input multiple-output (MIMO) feedback systems with significant plant uncertainty. Sufficient conditions are first derived to assure the achievement of the given off-diagonal performance. Then the given performance bounds on each main channel are reallocated on a reasonable basis, such that not only is the main channel performance easily achieved, but also the trade-offs of performance bounds between the loops become transparent during the system synthesis.

ISSN:0020-7179    

DOI:10.1080/00207179608921709

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor