Conceptual design methodology for vibration isolation

Details Conceptual design methodology for vibration isolation Conceptual design methodology for vibration isolation

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997spie.3041..760h&link_type=abstract

Proc. SPIE Vol. 3041, p. 760-771, Smart Structures and Materials 1997: Smart Structures and Integrated Systems, Marc E. Regelbru

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High performance dynamic structures have strict requirements on structural motion that are emphasized by the flexibility inherent in lightweight space systems. Vibration isolation is used to prevent disturbances from affecting critical payload components where motion is to be minimized. Isolation, however, is often an engineering solution that is not properly considered in the early conceptual design of the spacecraft. It is at this key stage of a program that mission driving performance targets and resource allocations are made yet little analysis has been performed. A conceptual design methodology for isolation is developed and applied to the conceptual design of a proposed space shuttle based telescope system. In the developed methodology, frequency domain computation of the closed loop performance without isolation pinpoints frequency regimes and disturbance to performance channels targeted for improvement. A coarse fidelity structural model, with well defined disturbance and performance characterization, is more useful than a costly high fidelity analysis when evaluating the many isolation options available early in a project. Isolation design choices are made by trading their performance improvement against their complexity/cost. Simple, idealized mechanical descriptions of the passive or active isolation system provide the needed frequency domain effect on performance without the costly analysis that a detailed isolator design entails. Similarly, the effects of other integrating subsystems, such as structural or optical control are approximated by frequency domain descriptions.

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