AAS 95-393

Component Model Reduction Methodology For Articulated Multi-Flexible-Body Structure

A. Lee, and W. S. Tsuha, Jet Propulsion Lab., Pasadena, CA

Abstract

A two-stage model reduction methodology, combining the classical Component Mode Synthesis (CMS) method and the newly developed Enhanced Projection and Assembly (EP&A) method, is proposed in this research. The first stage of this methodology involves the generation of CMS mode sets, such as those predicted by the MacNeal-Rubin procedures. These mode sets are then used to reduce the order of each component model in the Rayleigh-Ritz sense. The resultant component models are then combined to generate reduced-order system models at various system configurations. A composite mode set which retains important system modes at all system configurations is then selected from these reduced-order system models. In the second stage, the EP&A model reduction method is employed to reduce further the order of the system model generated in the first stage. The effectiveness of the COMPARE (COmponent Modes Projection and Assembly model REduction) methodology has been successfully demonstrated on a high-order, finite-element model of the Galileo spacecraft.