Method and system for decoupling structural modes to provide consistent control system performance

摘要

A method and system for calculating a control function for a structural system ( 10 ) that can be used to determine an appropriate control force to apply to an active member ( 18 ) within a stationary member ( 12 ) on the structural system ( 10 ). An active member ( 18 ) and a stationary member ( 12 ) are defined as a two-mass system in which the active member ( 18 ) and the stationary member ( 12 ) move in opposite directions. The stationary member ( 12 ) is mounted to an isolation subsystem ( 14 ) that is composed of six isolators ( 28 ) at multiple degrees of freedom. The isolation subsystem ( 14 ) is softer than the stationary member ( 12 ), active member ( 18 ) and a spacecraft surface ( 16 ) due to a damping element ( 32 ) of the isolation subsystem ( 16 ). The isolation subsystem ( 16 ) is mounted to the spacecraft ( 16 ) and decouples the spacecraft ( 16 ) from the stationary member ( 12 ) and thus the active member ( 18 ). An accurate control force for the active member ( 18 ) can be determined based upon the above structure ( 10 ).