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During the analysis and design of control systems, the complex SISO linear system that consist of several single transfer functions plus different time delay are often encountered and need to be reduced order. However, due to the complicated characteristics, it is difficult for such high-order model to obtain the reduced-order model using the existing methods. In this paper, a frequency-domain weighted...
An optimal regulator is presented for a nonlinear discrete-time system with input delay and a quadratic criterion. First, the original problem is reduced to the nonlinear-quadratic regulator design for a system without delays by an extended Artstein model reduction approach. Then, An iterative process is proposed to find a solution sequence of the nonlinear two-point boundary value (TPBV) problem...
This paper studies the controller structure selection problem for large multivariable systems. Current approaches to this problem either rely on the control engineer's experience and intuition, or solutions of very difficult and non-convex combinatorial optimisation problems. In this paper new computationally inexpensive analysis tools are presented which provide the control engineer with a complete...
Almost all multivariable design techniques impose a fixed structure on the final controller. This may be centralised or (block) decentralised, but it is typically the case that the structure is either not adequate or excessive. This work concerns an alternative design method whereby the controller structure is not fixed, but instead is also a design objective. Based on this a generic cost function...
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