充液对压电振子超声振动频率的影响研究

Research on Influence of Fluid-Filled on Vibration Characteristics for a Piezoelectric Vibrator

振子在不同边界条件下模态将有较大的变化,利用ANSYS有限元模拟,对空心振子充液前后进行了对比模拟,并进行了振子的实际测试实验,探究了充液对空心振子超声振动模态频率的影响。有限元模拟分析及振子实际测试表明,空心振子在充液后,同阶振动频率将会降低,并且频率降低的幅度随着所充液体密度的增大而增大;对空心振子纵弯模态频率在充液前后的不同变化情况进行了研究与比较,对比发现,充液条件对于弯曲模态频率的影响大于对拉伸模态的影响;充液压电振子的幅频特性曲线呈非线性,软特性。为超声压电振子的模态频率微调提供了理论与实验依据。

Vibration mode under different boundary conditions were different, and a piezoelectric vibrator with an inner cavity was researched, using finite element analysis software ANSYS to make simulation and contrast, and experimental test was also conducted, aiming at finding the difference of vibration mode between a hollow piezoelectric vibrator and after the hollow piezoelectric was filled with liquid. Furthermore, filling different density liquids were also concerned. The research come to some conclusions, in the liquid cases, resonance frequency is reduced, and with the liquid density increasing, the resonance frequency becomes lower and lower. What＇s more, liquid influence on the bending mode is greater than the influence on tensile mode. The amplitude-frequency curve of fluid-filled piezoelectric vibrator shows nonlinear and soft characteristics. All these provide theoretical and experimental foundation for the modal frequency of ultrasonic piezoelectric vibrator fine-tuning.