压电风扇振动方程和速度场的数值分析  

Numerical analysis on piezoelectric fan vibration equation and velocity field

作　　者：郝旭峰[1] 朱敏波[1] 

机构地区：[1]西安电子科技大学机电工程学院,西安710000

出　　处：《计算机辅助工程》2016年第5期32-35,40,共5页Computer Aided Engineering

摘　　要：通过ANSYS建立压电风扇的简化模型,对压电风扇进行模态分析,得出1阶模态下的共振频率为51.19 Hz;通过瞬态分析得出风扇上给定点的最大振动位移和振动特性,拟合出压电风扇处于最大位移时的振动曲线;得出压电风扇在整个工作过程的振动函数方程;通过此运动方程编写用户自定义函数(User-Defined Function,UDF)在FLUENT中计算出压电风扇周围最大速度为1.94m/s,沿流道长度方向上的速度约为0.73 m/s.A simplified model of piezoelectric fan is built and its modal analysis is done in ANSYS. It iscalculated that the resonant frequency of the first order mode is 51. 92 Hz. According to the transientanalysis, the maximum displacement and the vibration characteristics of the given nodes and thepiezoelectric fan are calculated, which are used to get the fitting curves of vibration when the piezoelectricfan is under maximum displacement. The vibration function equation of the piezoelectric fan is obtainedin the whole work process, by which a User-Defined Function（ UDF） is programmed in FLUENT. By theUDF, it is calculated that the maximum velocity is 1. 94 m/s around the piezoelectric fan and theapproximate velocity is 0.73 m/s along the longitudinal direction.

关 键 词：压电风扇 模态分析 位移测量 瞬态分析 振动方程 流场分析 

分 类 号：TK172[动力工程及工程热物理—热能工程]