A Krylov model reduction methodology for articulated, multi-flexible body structures

A Krylov model reduction methodology is proposed for articulated, multi-flexible body structures. This methodology generates reduced-order component models without solving any eigenvalue problem. The reduced-order system model obtained with these component models matches exactly a specified number of low frequency moments of the full-order system. Additionally, all structural modes that contributed significantly to the input-to-output mapping of the full-order system are closely captured by the reduced-order system model. The effectiveness of the proposed methodology in generating reduced-order system models which capture both the time and frequency-domain information of the full-order models, at multiple system configurations, and over a frequency range of interest, was successfully validated using a finite-element model of the Galileo spacecraft