Microgravity Lsolation System Design: A Modern Control Synthesis Framework

Manned orbiters will require active vibration isolation for acceleration-sensitive microgravity science experiments. Since unibilicals are highly desirable or even indispensable for many experiments, and since their presence greatly affects the complexity of the isolation problem, they should be considered in control synthesis. In this paper a general framework is presented for applying extended H, synthesis methods to the three-dimensional microgravity isolation problem. The methodology integrates control- and state frequency weighting and input- and output disturbance accommodation techniques into the basic H2 synthesis approach. The various system models needed for design and analysis are also presented. The paper concludes with a discussion of a general design philosophy for the microgravity vibration isolation problem.