Reduction of thermo-elastic damping with a secondary elastic field |
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Authors: | S Kumar |
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Institution: | Department of Mechanical and Nuclear Engineering, Penn State University, University Park, PA 16802, USA |
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Abstract: | Thermo-elastic damping is the dominant mode of energy loss due to the coupling of thermal and elastic fields in a body vibrating at or near resonant frequency. While the literature contains both exact and numerical schemes to quantify it, no technique is available yet to reduce thermo-elastic damping. We address this issue by introducing a secondary elastic field to derive an exact expression that predicts linear reduction in thermo-elastic damping with respect to frequency. Contrary to the current understanding, introduction of a static axial stress in addition to the flexural stresses is shown to increase quality factor and resonant frequency simultaneously. |
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