منابع مشابه
Subspace identification from closed loop data
So called subspace methods for direct identiication of linear models in state space form have drawn considerable interest recently. They have been found to work well in many cases but have one drawback { they do not yield consistent estimates for data collected under output feedback. This contribution points to the reasons for this and also shows how to modify the basic algorithm to handle clos...
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This paper deals with the problem of continuoustime model identification and presents a subspace-based algorithm capable of dealing with data generated by systems operating in closed-loop. The algorithm is developed by reformulating the identification problem from the continuous-time model to an equivalent one to which discrete-time subspace identification techniques can be applied. More precis...
متن کاملSubspace Identification using Closed-Loop Data
The purpose of this thesis was to investigate how different subspace identification methods cope with closed loop data, and how the controller parameters affect the quality of the acquired models. Three different subspace methods were subject for investigation; the MOESPmethod, theN4SIDmethod and theDSR_emethod. It is shown through a simulation example that all three subspace methods will ident...
متن کاملSubspace-based optimal IV method for closed-loop system identification
This paper deals with an optimal instrumental variable method dedicated to subspace-based closed-loop system identification. The presented solution is based on the MOESP technique but requires to modify the original scheme by proposing a new PO MOESP method which uses reconstructed past input and past output data as instrumental variables. The developed approach is then illustrated via a simula...
متن کاملPrediction Error Vs Subspace Methods in Closed Loop Identification
In this paper we investigate the role of the predictor in subspace identification. We shall see that it is the key object which allows to construct realization procedures which ideally work regardless of the presence of feedback. We discuss this point in some detail.
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ژورنال
عنوان ژورنال: Modeling, Identification and Control: A Norwegian Research Bulletin
سال: 2005
ISSN: 0332-7353,1890-1328
DOI: 10.4173/mic.2005.3.3