摘要:

A method of nested feedback loop decomposition of a given system is developed based on a special coordinate basis which reveals the finite and infinite zero structure of the system. This decomposition leads to a model order reduction procedure by which any arbitrary subset of the system invariant zeros can be retained in the model while the infinite zero structure of the model and the system are one and the same. Thus this method of model order reduction is a method of reducing the dynamic order via the zero structure of the given system. Several examples illustrate the method

ISSN:0020-7179    

DOI:10.1080/00207179008953531

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

Digital control based on a phase-locked loop technique is presented. The key to this control is up/down counting. A dynamical model is given which links up/down counting with integrative control. The addition of proportional-derivative or similar algorithms is suggested to improve the control performance. A variation of the Åström-Hägglund methods is developed as a tuning procedure. Some comments are made on the sampling effects

ISSN:0020-7179    

DOI:10.1080/00207179008953532

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

In using dynamic programming, by taking only accessible states for the x-grid and using an iterative procedure employing region contraction, only a small number of grid points are required at each iteration to yield very good accuracy even if the dimension of the system is high. The effect of the number of grid points and the choice of the contraction factor are analysed by considering a non-linear system consisting of eight ordinary differential equations and four control variables.

ISSN:0020-7179    

DOI:10.1080/00207179008953533

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A detailed proof of the following criterion of causality in the frequency domain is presented: a linear time invariant (possibly unstable) system P mapping a subspace of the Hardy space H2into H2is causal if and only if for any x( · )ϵ Dom (P), exp (α) x( ·) ϵ H2for α > 0 implies exp(α) Px( · ) ϵ H2. Some applications of this criterion and properties of the causal systems are also presented

ISSN:0020-7179    

DOI:10.1080/00207179008953534

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

A scheme for feedback control of reverse reaction processes, characterised by stable non-minimum phase transfer functions, is described. The approach is based on a ‘pseudo-predictor’, which is essentially a Pade approximation to a Smith predictor. An example demonstrates a trade-off involved, and shows the decisive contribution to tightness of control made by the pseudo-predictor

ISSN:0020-7179    

DOI:10.1080/00207179008953535

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor