<title>Integrated active and passive control design methodology for the NASA LaRC CSI evolutionary model</title>

Abstract

A general design methodology to integrate active control with passive damping has been demonstrated on the NASA LaRC CSI Evolutionary Model (CEM), a ground testbed for future large, flexible spacecraft. A limited bandwidth active controller is designed with a frequency-shaped H<SUB>2</SUB> algorithm which minimizes the response of a line-of-sight (LOS) measurement system. Using the modal strain energy (MSE) method, a passive damping treatment is designed based on damping level requirements for a set of targeted modes in the high-frequency band, beyond the active control bandwidth. The damping levels are selected to achieve robustness as well as the same level of performance in the high frequency band as in the active control bandwidth. A set of 60 viscoelastic damped struts were designed and fabricated for the CEM. An integrated active/passive controller was successfully implemented on the CEM and was evaluated against an active-only controller.