Glovebox Integrated Microgravity Isolation Technology G Limit A Linearized State Space Model

Glovebox Integrated Microgravity Isolation Technology (G-Limit)

Vibration acceleration levels on large space platforms exceed the requirements of many space experiments. The Glovebox Integrated Microgravity Isolation Technology (g-LIMIT) is being built by the NASA Marshall Space Flight Center to attenuate these disturbances to acceptable levels. G-LIMIT uses Lorentz (voice-coil) magnetic actuators to levitate and isolate payloads at the individual experiment/sub-experiment (versus rack) level. Payload acceleration, relative position, and relative orientation measurements are fed to a state-space controller. The controller, in turn, determines the actuator Currents needed for effective experiment isolation. This paper presents the development of an algebraic, state-space model of g-LIMIT, in a form suitable for optimal controller design. The equations are first derived using Newton's Second Law directly, then simplified to a linear form for the purpose of controller design.Hampton, R. David and Calhoun, Philip C. and Whorton, Mark S.Langley Research Center; Marshall Space Flight CenterMICROGRAVITY; VIBRATION; ISOLATION; TECHNOLOGY ASSESSMENT; MATHEMATICAL MODELS; SPACE PLATFORMS; SPACEBORNE EXPERIMENTS; PAYLOADS; CONTROLLERS; ACTUATORS

A "Kane's Dynamics" Model for the Active Rack Isolation System

Aerospace America