基于模态分析方法的风机底座结构优化  

Structural Optimization of Fan Base Based on Modal Analysis Method

作　　者：王弼 孙丽娟 陈启明 常超 王枭 黄文俊 Bi Wang;Li-juan Sun;Qi-ming Chen;Chao Chang;Xiao Wang;Wen-jun Huang(Hefei General Machinery Research Institute Co.,Ltd.)

机构地区：[1]合肥通用机械研究院有限公司

出　　处：《风机技术》2022年第4期60-63,共4页Chinese Journal of Turbomachinery

基　　金：合肥通用机械研究院青年基金项目(2020011733)。

摘　　要：针对某风机运行时机脚振动偏大的问题,通过试验研究发现风机底座的固有频率值接近风机机脚振动峰值频率,因此认为两种频率共振是引起机脚振动偏大的主要原因之一。通过加强底座刚度设计了四种底座优化结构。利用有限元软件进行模态计算,选取最优的底座结构,比较优化前后的机脚振动,发现优化后底座的机脚振动值降低了2.1dB(线性计权)。Aiming of the high vibration of a fan base during its operation,an experimental research result indicates that the natural frequency of the fan base is closed to the peak vibration frequency of the fan foot.It leads to the resonance which is one of major reason of the high vibration.Four optimal structures by strengthening the stiffness of the fan base are proposed in this paper.The best optimal structure in four kinds of structures is selected by modal calculation with finite element software.The compare result of foot vibration before and after optimization shows the best optimization solution takes a reduction of 2.1dB(linear weighting)on the vibration value of fan base.

关 键 词：机脚振动 固有频率 共振 优化 

分 类 号：TH43[机械工程—机械制造及自动化]