Simulation and interdisciplinary design methodology for control-structure interaction systems.

摘要

Computational procedures for preliminary design, synthesis, and simulation of control-structure interaction systems are developed from a second-order systems viewpoint. First, a partitioned solution procedure is developed for the solution of the equations of motion with feedback controls. The computational stability and implementation aspects of the partitioned computational procedure for control-structure interaction analysis is presented. Implementation issues for enhancing both accuracy and the computational stability margin and modular programming of the procedure are addressed.;Second, a computational procedure that takes advantage of the structure of second-order differential equations is developed for state estimation. It is shown that the reconstruction of system states through second-order observers is computationally more attractive than existing first-order observer models if certain mildly restrictive conditions are satisfied. Hence, the present second-order observers enable the analyst to utilize larger observer models than have been possible with first-order observer models.;The third issue addressed is the integrated design of controlled structures. A method for optimization of the controlled structural system using only structural tailoring is presented. Optimal linear quadratic regulator control theory is used and the closed-loop performance is expressed in terms of structural parameters. Also, a software testbed has been designed and implemented for evaluating new formulations and algorithms for controlled structural analysis and design. The testbed fully exploits existing sparse matrix structural analysis techniques, modular control synthesis capabilities and versatile optimization methods to alleviate unnecessary structural and control calculations. The testbed has been used to demonstrate the present partitioned procedures, the performance of second-order observers and the effectiveness of structural tailoring for improved dynamics and control performance on a number of realistic spacecraft applications.