Current concepts for the design of large space structures generally involve large dimension truss structures that require vibration control systems to suppress motion. Several of the difficulties in the design of active/reactive control systems could be avoided if the controlled structure provided deterministic repeatable passive damping at high levels. The feasibility of developing an optimal control approach is being investigated. Ground rule requirements of large space structures for damping are being established. Various concepts for damping treatments are being studied. A configuration trade is being performed to select an integrated damper/structure element using a viscous hydraulic damping element. Devices of this type previously have been developed and space qualified and have demonstrated linear deterministic damping rates over a wide range of temperature and input amplitude and frequency. Various implementations of active vibration control actuators are being evaluated. An optical control approach for the large space structure is being determined and an appropriate test plan is being generated. Near term applications include potentially the space station, space based radar, and various components of a space-based strategic defense system as well as commercial satellites.
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