DESIGN AND EVALUATION OF FREQUENCY WEIGHTED LQG - MAXIMUM-ENTROPY CONTROLLERS ON AN EXPERIMENTAL TRUSS STRUCTURE

This paper will discuss the experimental evaluation of a structural co ntrol system designed using a combination of Frequency Weighted LQG an d Maximum Entropy. The experimental implementation was performed on an experimental truss structure, the Sandia Truss, which is described in the paper. The control design model was obtained via experimental sys tem identification using the eigensystem realization algorithm with da ta correlation. The control design used frequency, weighting to stabil ize the unstructured uncertainty of the system due to low signal-to-no ise and uncertain system dynamics in various frequency ranges. Maximum entropy is used to provide robustness Sor structured uncertain system dynamics within the controller bandwidth. The experimental implementa tion of the controllers designed with this approach show the ability t o design controllers with a specified bandwidth, gain stabilization of unstructured uncertainty, and robustness to structured uncertainty wi thin the controller bandwidth.