著者

孫 連明 三宅 泰弘 大森 浩充 佐野 昭

出版者

The Society of Instrument and Control Engineers

雑誌

計測自動制御学会論文集 (ISSN:04534654)

巻号頁・発行日

vol.36, no.4, pp.348-355, 2000-04-30 (Released:2009-03-27)

参考文献数

16

被引用文献数

2 2

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Closed-loop identification is essentially needed in control of an unstable plant stabilized by a feedback controller. A new direct closed-loop identification approach is proposed based on an output inter-sampling scheme, in which by taking faster sampling of the output than the input of the system the restrictive identifiability condition is removed. In a case of unstable system, since the noise model becomes non-minimum phase system, the prediction error method is not available. In order to solve these problems we clarify that the output inter-sampling gives the SIMO structure of the plant model and give a new identification method in which the denominator polynomial can be identified in an open-loop manner and the numerator polynomial can also be obtained by a modified instrumental variable method. The proposed algorithm is validated in an experimental study using a magnetic suspension system.