MODAL COUPLING IN LINEAR-CONTROL SYSTEMS USING ROBUST EIGENSTRUCTURE ASSIGNMENT

Eigenvalue assignment methods are used widely in the design of control and state-estimation systems. The corresponding eigenvectors can be s elected to ensure robustness. For specific applications, eigenstructur e assignment can also be applied to achieve more general performance c riteria. In this paper a new output feedback design approach using rob ust eigenstructure assignment to achieve prescribed mode input and out put coupling is described. A minimisation technique is developed to im prove both the mode coupling and the robustness of the system, whilst allowing the precision of the eigenvalue placement to be relaxed. An a pplication to the design of an automatic flight control system is demo nstrated. (C) 1998 Elsevier Science Inc. All rights reserved.