Modal Characterization of a Piezoelectric Shaker Table
AIR FORCE INSTITUTE OF TECHNOLOGY WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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Piezoelectric actuated shaker tables are often used for high frequency fatigue testing. Since natural frequencies can appear in the operating range of these shaker tables, it is necessary to conduct modal characterization of the system before testing. This thesis describes the design and experimental validation of a mechanical model used for modal analysis of a piezoelectric shaker table. A commercially available three-dimensional scanning device was used to produce a point cloud model of the surface geometry, which was converted to a solid model and imported into a Finite Element Analysis FEA package for modal analysis. Using a laser vibrometer to measure displacement and velocity, the physical vibration response of the shaker table was obtained for comparison with FEA frequency response results. The laser vibrometer data was used to validate and tune the FEA modal response.
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