关键词: 超磁致伸缩换能器, 磁电力耦合模型, 几何非线性, 电磁参数, 频响特性

Abstract: Considering the nonlinear rigid characteristic of the reed in the giant magnetostrictive actuator, a composite nonlinear model was developed involving the characteristics of square and cube values of reed's damping. Then, the analytic solution of the geometrical nonlinear vibration system and the frequency-response properties of the actuator were analyzed by using multi-scale method. Based on the model, the numeric and academic solutions with cutting case and without cutting case are calculated, and the time domain waveform of the numeric and academic solutions are analyzed and compared, and the frequency-response relationship formulate with actual parameter are derived. And the effects of electromagnetic parameters f, piezomagnetic coefficient d33 and magnetic conductivity μ33^T on frequency-response properties of the actuator are discussed. The results indicate that the time domain waveforms showed by analytic and numerical solutions are about the same and both can meet the practical requirements, the parameters f, d33 and μ33^T all affect obviously the frequency-response characteristic of giant magnetostrictive actuator, which must be taken into account when studying its nonlinear rigidity.