CONSIDERATION OF PLANT UNCERTAINTIES IN OPTIMUM STRUCTURAL-CONTROL DESIGN

An integrated design approach for the optimum design of a controlled s tructure is presented. The control design method takes into considerat ion both structured and unstructured uncertainties by improving a boun d on the H(infinity) norm of the closed-loop system and satisfying a c onstraint on the linear quadratic Gaussian performance index. The cont roller is designed by solving three Riccati equations. The weight of t he structure is specified as an objective function with constraints on the structural frequencies, the closed-loop damping, and the performa nce index. The numerical results are presented for a three-dimensional truss structure to illustrate the application of the integrated appro ach.