The University of Dayton Research Institute (UDRI) is teamed with McDonnell Douglas Aerospace (MDA) to develop and fly a NASA IN-STEP experiment entitled Jitter Suppression Experiment (JSX). The JSX will demonstrate a combined active/passive vibration control system on an actual full scale space structure. This paper will present the details of the design of the passive control system to be applied to six graphite/epoxy support tubes for a gimballed telescope assembly (GTA) and the results of concept development laboratory tests. The most promising damping concepts for tubes such as the GTA truss tubes were constrained layer dampers and tuned dampers. The advantages and disadvantages of each of these damping concepts and the reasons for choosing a constrained layer concept will be discussed.The design parameters which effect the performance of a constrained layer damping system are the thickness of the viscoelastic material and constraining layer, the materials used, and the constraining layer length. The constrained layer concept was first modeled using standard fourth order beam theory. Refining the analysis to a multiple-layer sixth order analysis enabled more accurate modeling and system damping estimates which allow further design definition leading to the optimum design. To verify the effectiveness of the passive damping design and to determine the constrained layer damping system effectiveness for axial modes, a finite element analysis of a single truss tube with the proposed constraining layer design was performed. A laboratory simulation was designed, developed, and evaluated to verify the analysis.
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