The presented technique addresses the problem of maintaining the powerful design simplicity and visibility of eigenstructure assignment, while reducing closed-loop eigenstructure sensitivity to dominant parameter variations. The method results from consideration of the allowable eigenvector subspace as a complete description of the eigenstructure assignment problem. Variations in open-loop system dynamics can thus be visualised as movements of the closed-loop allowable subspace. If a nonlinear model is linearised about two operating points with intersecting subspaces, assignment from the intersection will yield the same closed-loop eigenstructure at both operating points. This hypothesis is proven, and the analysis extended to include the case of non-intersecting subspaces. This reduced subspace design method has been tested on an eighth-order helicopter model that exhibits significant nonlinearity when forward speed is varied. The results demonstrate a considerable reduction in variation of the closed-loop eigenstructure over conventional techniques.
Assignment of reduced sensitivity eigenstructure
IEE Proceedings - Control Theory and Applications ; 147 , 1 ; 104-110
2000
7 Seiten, 22 Quellen
Aufsatz (Zeitschrift)
Englisch
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