基于ANSYS Workbench小麦脱粒机离心风机叶轮有限元分析

Finite Element Analysis on Wheat Thresher' s Centrifugal Fan Impeller Based on ANSYS Workbench

离心风机在农业生产中有着广泛的应用,叶轮是风机的主要部件之一,对风机性能有很大影响。本研究以小麦脱粒机离心风机的叶轮为研究对象,应用Creo建立风机叶轮的三维模型,并将模型以IGS格式导入到有限元分析软件ANSYS Workbench中,对其进行静力学分析和模态分析。通过静力学分析,得到叶轮工作时的等效应力与应变云图:最大应力出现在轮盘轴孔台肩周围和叶片内侧与叶轮连接处,最大值为204.2 MPa,小于材料屈服强度420 MPa;通过模态分析,得到前八阶模态的振频和振型:叶轮的干扰频率21.82 Hz远小于前八阶模态的振频;根据分析结果,验证了叶轮工作的安全性。利用Creo和ANSYS Workbench的联合进行有限元分析,不仅缩短了静力学分析和模态分析所需的时间,而且提高了结果的准确性,为优化设计提供了理论依据。

Centrifugal fan is widely used in agricultural production. The impeller is one of the main components of the wind turbine and has a great influence on the performance of fan impeller. We took the wheat thresher＇s centrifugal fan impeller as the research object. The simplified 3D model of the wheat thresher＇s centrifugal fan impeller was built by Creo, and then imported into fi- nite element analysis software ANSYS Workbench in the form of IGS for static analysis and modal analysis. The equivalent stress nephogram and strain nephogram of the impeller on working could be obtained by static analysis, and they illustrated that the maximum stress was 204.2 MPa oc- curred in the joint of shaft shoulder and the inside welding of wheel and blades, which was smaller than the material＇s yield strength whose value is 420 MPa. The modal analysis was carried out to obtain the natural frequencies and the vibration-made vectors of the first 8 orders, and it illustrated that impeller＇s interference frequency whose value was 21.82 Hz and was smaller than the naturalfrequencies. Through the above analysis, we can know that the impeller is safe in the normal oper- ating. The finite element analysis by using Creo and ANSYS Workbench which can not only reduce the calculation time, but also improve the accuracy of analysis provides a theoretical basis for the optimization design.