Methodology for modeling the mechanical interaction between a reaction wheel and a flexible structure

Laila Mireille Elias; Frank G. Dekens; Ipek Basdogan; Lisa A. Sievers; Timothy Neville

doi:10.1117/12.460875

26 February 2003 Methodology for modeling the mechanical interaction between a reaction wheel and a flexible structure

Laila Mireille Elias, Frank G. Dekens, Ipek Basdogan, Lisa A. Sievers, Timothy Neville

Proceedings Volume 4852, Interferometry in Space; (2003) https://doi.org/10.1117/12.460875
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

This paper presents a modeling methodology used to predict the performance of a flexible structure, such as a space telescope, in the presence of an on-board vibrational disturbance source, such as a reaction wheel assembly (RWA). Both decoupled and coupled analysis methods are presented. The decoupled method relies on blocked RWA disturbances, measured with the RWA hardmounted to a rigid surface. The coupled method corrects the blocked RWA disturbance boundary conditions using 'force filters' which depend on estimates of the interface accelerances of the RWA and spacecraft. Both methods were validated on the Micro-Precision Interferometer testbed at the Jet Propulsion Laboratory. Experimental results are encouraging, indicating that both methods provide sufficient accuracy compared to measured values; however, the coupled method provides the best results when the gyroscopic nature of the spinning RWA is captured in the RWA accelerance model. Additionally, the RWA disturbance cross spectral density terms are found to be influential.

Citation Download Citation

Laila Mireille Elias, Frank G. Dekens, Ipek Basdogan, Lisa A. Sievers, and Timothy Neville "Methodology for modeling the mechanical interaction between a reaction wheel and a flexible structure", Proc. SPIE 4852, Interferometry in Space, (26 February 2003); https://doi.org/10.1117/12.460875

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