Abstract
This chapter discusses a computer-aided design method of multivariable systems using output feedback. From a practical point of view, a design based on output feedback enjoys the advantage that the signals required for feedback are directly available. Wolovich obtained concise necessary and sufficient conditions for output feedback decoupling in the frequency domain. It has been shown that the class of systems, which can be decoupled, can be extended by considering a wider class of feedback matrices. This result implies a constructive procedure for decoupling, and forms the basis for a useful and practical design algorithm. This procedure has been implemented by a digital computer program. The chapter describes output feedback decoupling problem and its solution. The new conditions give rise to the problem of the joint stability of the closed loop decoupled system and the feedback subsystem. The calculations that must be carried out by the computer program have been outlined in a step-by-step manner. The chapter discusses specific details of the program and presents some numerical problems.
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