A design principle is proposed whereby a matrix control law is determined in the modal domain for a linear control object with multiple input and output. The control law, applied as a secondary loop of a cascade control system, is aimed to drastically improve the plant dynamics relative to recovery from load upsets as well as speed of response for reference input changes. Although the control algorithm itself can be easily realized by the DDC, the effectiveness of the proposed scheme rests on the location of measuring and controlling elements. The loss of controllability due to pole zero cancellation of the classical decoupling control is pointed out as its serious defect.
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