Experimental Measurement and Theoretical Analysis of Dynamic Characteristics for Lead-free Piezoceramic and Piezoelectric Fiber Composite Plates and the Application of Electrode Design for Aluminum plate excitation
Date Issued
2012
Date
2012
Author(s)
Lin, Shih-Hao
Abstract
The three-dimensional dynamic characteristics of barium titanium piezoceramic material of lead-free is studied and analysis in this article, including piezoceramic rectangular plate, piezoceramic disc, piezoceramic ring and piezoelectric fiber composite plate. The study of three-dimensional dynamic characteristic of piezoceramic material is obtained by experiment measurements, finite element method (FEM) and theoretical analysis. The barium titanium is one kind of piezoceramic material with good electromechanical coupling efficiency. The temperature distribution of piezoelectric material in high frequency in-plane vibration is studied by experiment measuring and numerical calculating for different geometry plates. In order to deeply realize vibrating characteristics and best exciting efficiency of aluminum plate, we take the piezoelectric fiber composite material as the actuator and the aluminum plate is excited by electrode design of piezoelectric fiber composite plate.
Several experimental techniques are used to measure the dynamic characteristics of piezoelectric materials in this study. First part is out-of-plane vibration, the point-wisely measurement system, laser Doppler vibrometer (LDV), can obtain out-of-plane resonant frequencies by dynamic signal swept-sine analysis the piezoceramic plate. Second, the full-filed optical technique, amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI), can measure simultaneously the resonant frequencies and mode shapes for out-of-plane vibration. The resonant frequencies and mode shapes of in-plane vibration are also measured by AF-ESPI. The excited voltages for mode shapes refer to the efficiency of three-dimensional vibration. Third, the correspondent in-plane resonant frequencies and anti-resonant frequencies are obtained by impedance analysis, and the electromechanical coupling coefficients can be calculated from impedance spectrum to perform the efficiency of resonance modes. Forth, infrared thermography is also full-field optical technique to measure the distribution of temperature filed. In theoretical analysis, the resonant frequencies, transverse and extensional vibration displacements of piezoelectric ceramic disc are derived and three-dimensional resonant frequencies are obtained. All the results of the experimental measurements and theoretical solutions are compared with the FEM results. Not only resonant frequency and mode shape have good agreement, the normalize displacement and experiment measurement correspond to the exicting voltage. The vibration efficiency of aluminum plate has good results in dynamic signal swept-sine analysis, AF-ESPI and impedance analysis. It is excellent consistence between resonant frequencies, mode shapes and normalized displacements on the dominant vibration motion by experimental measurements, finite element numerical calculations, and theoretical analysis.
Subjects
piezoceramic rectangular plate
piezoceramic disc
piezoceramic ring
piezoelectric fiber composite
resonant frequency
mode shape
electrode design
LDV
AF-ESPI
Impedance analyzer
infrared thermography
finite element method
Type
thesis
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