微环音气流压电发电机声管固定方法

摘要

针对声管固定方法对微环音气流压电发电机最大输入功率的影响，提出了应用有限元和间边界元相结合的方法，对不同固定方法下的声管，数值模拟腔体受谐波(正弦波)激励的振动响应。在满足压电换能器最大机械功率条件下，选择合适的声管固定方法。结果表明：结构尺寸一定时，固支-固支固定有利于提高固有频率；结构尺寸越小，不同固定方法所对应的固有频率差异越大；固支-固支固定下，声管的基频较高且其偏差影响小。不同固定方法和不同尺寸下声管的谐响应和基频变化趋势，为微环音气流压电发电机的设计提供参考，也为进一步的换能器设计和验证实验提供了依据。%Methods of sound tube fixation the have great effect on the input power of micro-ringtone airflow piezoelectric generator.A finite element method combined with indirect boundary element method was proposed, harmonic responses of the sound tube with various fixation methods were analyzed.To maximize mechanical power of piezoelectric transducer,it should be choosing proper fixation methods of the sound tube.The result showed that:for the given structure size,clamped-clamped fixation method was beneficial to improve the natural frequency;the smaller size,the greater difference of natural frequency corresponded to various fixation meth-ods;clamped-clamped sound tube possessed higher fundamental frequency,and its deviation was small.The harmonic response and trend of fundamental frequency of sound tube with various fixing boundaries and different diameters could provide valuable reference for the design of micro-ringtone airflow piezoelectric generator;and it also provided the basis for further the design of transducer and experimental verification.