超低幅值激励下压电梁的响应特性分析

Analysis of Response Characteristics of Piezoelectric Beam under Ultra-Low Amplitude Excitation

通过电磁激励方式研究了压电悬臂梁结构在超低幅值激励下的响应特性。对线性压电梁的响应进行了实验研究,分析了激励幅值的影响。研究了引入单侧阻挡后压电梁的非线性响应特性,分析了激励幅值、阻挡间隙对单侧阻挡压电梁宽带响应的影响。实验结果表明,在0.003 N的电磁激励下,压电梁的振幅小于140μm。引入单侧阻挡后压电梁表现出分段线性响应,对阻挡间隙微米尺度的变化灵敏。随着间隙从100μm减小到20μm,最大输出电压从3.14 V减小到1.17 V,半功率带宽从5.8 Hz增大到18.2 Hz。

The response characteristics of piezoelectric cantilever under ultra-low amplitude excitation were studied through the electromagnetic excitation. Firstly, the response of the linear piezoelectric beam was studied experimentally, and the influence of excitation amplitude were analyzed. Then, the nonlinear response characteristic of the piezoelectric beam with unilateral stopper was investigated, and the influences of excitation amplitude and gap size on the broadband response of the piezoelectric beam with the unilateral stopper were analyzed. The experimental results showed that the amplitude of the piezoelectric beam was less than 140 μm under electromagnetic excitation of 0.003 N. The piezoelectric beam with a unilateral stopper showed a piecewise linear response and was sensitive to the micron scale change of the gap size. As the gap decreased from 100 μm to 20 μm, the maximum output voltage decreased from 3.14 V to 1.17 V, and the half-power bandwidth increased from 5.8 Hz to 18.2 Hz.