'1'his paper proposes a vibration attenuation strategy for spaceborne optical interferonleters to n~eet their sut)-nlicron positional stability requirements. Specifically, the Stellar Interferonleter Mission requires 10-nanonleter level stabilization of optical elenlentsdistributed acrossa 10n~flexiM estructurein tllc~)rescrlce oft}lc~)rirllary clistur-ba~~ccsource, spillllitlg reactioli whcel~sse1[lblies. Theproposed strategy incorporates the high-frequency attenuation of six-axis vibration isolation with lc)w-frequency attenuation of active optical corltrol. '1'he strategy is itnplemmted on the hIicro-Precision Interferonleter testbed, a fully-functional hardware n~oclel of a future spaceborne iuterferolneter. [;ol~ll)it~ir]g x[leasllred tcstbed disturbat]ce trarlsfer fLlllctiolls witllastocllastic nlodel of reaction wheel disturbances enables evaluation of the vibration attenuation strategy in the expected oil-orbit disturbance envitonrnent. Nesults indicate that the requirement of 10 nrn is satisfied.
This paper describes recent advances in structural quieting technology as applied to active truss structures intended for high precision space based optics applica tions. The active structure incorporates piezoelectric active members which exert control forces internal to the structure and thereby improve the structure's dimensional stability. The control architecture involves two layers of feedback control. The first utilizes col located measurements of force and velocity at the active member to achieve active damp ing, the second utilizes noncollocated measurements of acceleration at the location of a simulated optical component to achieve structural stabilization. The local control loops are based on the concept of impedance matching, the global control loops are designed using robust control methods. These two levels of control are intended to operate simulta neously; however, in this paper each approach is applied individually. The combined im plementation is left for future work.
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