Experimental full field investigations of resonant vibrations for piezoceramic plates by an optical interferometry method |
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Authors: | Chien-Ching Ma Chi-Hung Huang |
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Institution: | (1) Department of Mechanical Engineering, National Taiwan University, Taipei, Taiwan 106, Republic of China;(2) Department of Mechanical Engineering, Ching Yun Institute of Technology, Chung-Li, Taiwan, 320, Republic of China |
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Abstract: | The experimental measurement of resonant frequencies for piezoelectric material is generally performed by impedance analysis.
In this paper we employ an optical interferometry method, called amplitude-fluctuation electronic speckle pattern interferometry
(AF-ESPI), to investigate the vibration characteristics of piezoceramic plates. This method demonstrates its advantages of
combining noise reduction, like the subtraction method, and high fringe sensitivity, like the time-averaged method. As compared
with the film recording and optical reconstruction procedures used for holographic interferometry, the interferometric fringes
of AF-ESPI are produced instantly by a video recording system. Based on the fact that clear fringe patterns measured by the
AF-ESPI method will be shown only at resonant frequencies, both the resonant frequencies and corresponding mode shapes are
obtained experimentally at the same time. Excellent quality for the interferometric fringe patterns of the mode shapes is
demonstrated. We find from experimental results that the out-of-plane vibration modes (type A) with lower resonant frequencies
cannot be measured by impedance analysis and only the in-plane vibration modes (type B) will be shown. However, both the out-of-plane
(bending) and in-plane (extension) vibration modes of piezoceramic plates are obtained by the AF-ESPI method. Finally, numberical
finite element calculations are also performed, and the results are compared with the experimental measurements. Excellent
agreement for the resonant frequencies and mode shapes are obtained from both results. |
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Keywords: | resonant frequency mode shape partially-electrode piezoceramic plate |
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