
This book has arisen from efforts over many years to find simple and powerful methods for designing industrial control systems.Experience has show that the classical transfer-function methods were very suitable for isolated loops,but failed in the multivariable situation.The never state-space methods at first promised success,but came in the end to seem disappointing. A growing conviction that design methods could only arise from deeper understanding led to a program of theoretical research.This had as one aim the development of a theory which would embrace transfer-function and state-space descriptions in a single whole/the hope was that on such a basics could be founded more powerful design techniques allied to both.
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