Browsing by Author "Wang, TS"

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Quantitative design of uncertain multivariable control system with an inner-feedback loop
(1997-03-01)
Cheng, CC
;
Liao, YK
;
Wang, TS
;
電子工程學系及電子研究所
;
電控工程研究所
An additional inner-feedback loop is used to reduce the channel interaction of a multivariable control system such that the design of outer-feedback loop can be treated as a single-variable problem for ease in achieving the required main-channel performance. The relative error between the exact input-output relation t(ii)(j omega> of channel i and its approximation (t) over cap(ii)(j omega> = {l(i)(j omega)f(ii)(j omega)}/{1 + l(i)(j omega)} is introduced to provide an effective measure for assessing the achieved noninteraction. According to the approach proposed, the single-input/single-output quantitative-feedback-theory design method can be applied directly for the design of both inner- and outer-feedback loops.
Quantitative feedback design of uncertain multivariable control systems
(1996-10-01)
Cheng, CC
;
Liao, YK
;
Wang, TS
;
電控工程研究所
;
Institute of Electrical and Control Engineering
An alternative QFT framework is proposed for the design of multiple-input multiple-output (MIMO) feedback systems with significant plant uncertainty. Sufficient conditions are first derived to assure the achievement of the given off-diagonal performance. Then the given performance bounds on each main channel are re-allocated on a reasonable basis, such that not only is the main channel performance easily achieved, but also the trade-offs of performance bounds between the loops become transparent during the system synthesis.