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17 September 1997 Experimental modal analysis for vibration with large amplitude using moire topography
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Proceedings Volume 3098, Optical Inspection and Micromeasurements II; (1997)
Event: Lasers and Optics in Manufacturing III, 1997, Munich, Germany
A new modal analysis using moire topography is proposed in this paper. A modal analysis with holographic interferometry is employed for vibration analysis, because non-contact and 2D measurements can be readily realized. The modal analysis using holographic interferometry is an effective measure for a vibration with small amplitude, it however, is difficult to apply to a vibration with large amplitude, such as over a few mm. In this paper, a vibration with a large amplitude is analyzed using the moire topography system. Single fringe image is grabbed by the projection moire topography system using a stroboscope whose flash timing is controlled with a computer system. The image is analyzed by the spatial fringe analysis method based on a new phase unwrapping. Consequently, the shape of vibrating object can be detected in process of the vibration. The new method can also analyze the vibration mode of an object that has a complex sharp. The vibration of some plates as simulation models of turbine blades is analyzed by this method. Modal parameters are calculated, then a visualization of the mode of the vibration can be realized. The results show that the proposed modal analysis is effective for the analysis of the vibration with a large amplitude.
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Yasuhiko Arai, Shunsuke Yokozeki, and Kazuhiro Shiraki "Experimental modal analysis for vibration with large amplitude using moire topography", Proc. SPIE 3098, Optical Inspection and Micromeasurements II, (17 September 1997);

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