Abstract: This paper discusses the results of a project which focused on the development and evaluation of internal damping concepts applicable to damping curved airfoil shaped plates. Thirteen damping concepts were analyzed. The analysis was completed using an FEA. The initial analysis computed modal damping for the first four modes of the structure. As the study progressed, the final analysis on the best two damping concepts calculated the modal damping for the first thirty modes. The system damping results were obtained using various damping materials, Young's moduli, and an assumed damping material loss factor of 1.0. The modal dampen was calculated as the ratio of the strain energy in the damping elements (SED) divided by the total strain energy (TSE) in the structure times the assumed material loss factor. The damping goal was set at 0.04 loss factor. The final designs developed had an average modal damping value which exceeded 0.1. This paper details the damping concepts evaluated, the thought process which led from one design to the next, the analysis used to evaluate the damping concepts, and the results of the trade study. !10
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