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## Active Control of Microvibrations

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Microvibrations, generally defined as low-amplitude vibrations at frequencies up to 1 kHz, are now of critical importance in a number of areas. One such area is onboard spacecraft carrying sensitive payloads, such as accurately targeted optical instruments or microgravity experiments, where the microvibrations are caused by the operation of other equipment, e.g. reaction wheels, necessary for its correct functioning. It is now well known that the suppression of such microvibrations to acceptable levels requires the use of active control techniques which, in turn, require sufficiently accurate and tractable models of the underlying dynamics on which to base controller design and initial performance evaluation. This chapter describes the development of a modelling technique for either mass or equipment loaded panels and the subsequent use of such models in controller design and basic performance prediction of the resulting feedback control schemes.

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