Equivalent amplitude model for a giant magnetostrictive transducer based on an unsteady electromechanical conversion coefficient
CAI Wanchong, ZHANG Jianfu, YU Dingwen, WU Zhijun, FENG Pingfa
Beijing Key Laboratory of Precision/Ultra-Precision Manufacturing Equipments and Control, Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China
Abstract：The vibration amplitude model of a giant magnetostrictive transducer was established using an equivalent circuit of the transducer. The model parameters were identified through an impedance analysis. The accuracy of the vibration amplitude model was improved by analyzing the effects of the frequency and amplitude of the excitation voltage on the electromechanical conversion coefficient. The relation between the excitation frequency and the electromechanical conversion coefficient was obtained experimentally. Then, the electromechanical conversion coefficient was calculated for various frequencies using interpolation to relate the vibration amplitude to the excitation current. Comparison with experimental results shows that the vibration amplitude model determined by the impedance analysis can be used to predict the transducer vibration at resonance. The interpolated electromechanical conversion coefficients can be used to calculate the vibration amplitudes so that the theoretical relations between the amplitude and the current for different excitation frequencies are consistent with experimental results, which indicates that the model has the proper relationships between the electromechanical conversion coefficient and the excitation frequency.
蔡万宠, 张建富, 郁鼎文, 吴志军, 冯平法. 基于非定常机电转换系数的超磁致伸缩换能器输出振幅模型[J]. 清华大学学报（自然科学版）, 2017, 57(5): 459-464.
CAI Wanchong, ZHANG Jianfu, YU Dingwen, WU Zhijun, FENG Pingfa. Equivalent amplitude model for a giant magnetostrictive transducer based on an unsteady electromechanical conversion coefficient. Journal of Tsinghua University(Science and Technology), 2017, 57(5): 459-464.
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