对旋轴流风机不同叶轮的模态对比分析

Comparative Analysis of Different Impellers′ Modal of Counter-rotating Axial Fan

以叶片角度可调和叶片角度固定的对旋轴流风机叶轮为研究对象,建立2种叶轮的三维模型,并导入ANSYS中进行计算模态分析,得到两叶轮前6阶的振型,在叶片尤其是叶顶处变形最大,角度调节机构使得叶片处变形小幅增大。利用LMS模态测试软件进行试验模态分析,得到两叶轮前6阶的固有频率。通过对比发现叶片角度调节机构使得叶轮整体固有频率小幅增大,且叶轮固有频率避开了电机的频率,在正常工作时不会产生共振。

Take two impellers of counter-rotating axial fan as research target, the installation angle of one impeller′ s blades are adjustable and the other one′ s blades are not adjustable. Created three-dimensional solid models of two impellers, then imported the models into ANSYS for modal analysis,calculated the six-order vibration modes of impellers. In the leaves, especially at the top, the deformation was maximum, angle adjusting mechanism makes the deformation of blade increase slightly.Measured the six-order natural frequencies of impellers by LMS modal test software. By comparing the natural frequencies of two impellers, found the angle adjustment mechanism makes the overall natural frequency of impellers increase slightly, and the natural frequency of impellers is not equal to the frequency of the motors, impellers will not resonate when they work properly.