考虑弹性基础特性的离心压缩机转子动力学分析  

Rotordynamic Analysis of Centrifugal Compressor Considering Elastic Support Characteristics

作　　者：太兴宇[1] 李凯华[1] 李云[1] 孟继纲[1] 肖忠会 李健伟[1] Xing-yu Tai;Kai-hua Li;Yun Li;Ji-gang Meng;Zhong-hui Xiao;Jian-wei Li(Shenyang Blower Works Group Corporation)

机构地区：[1]沈阳鼓风机集团股份有限公司

出　　处：《风机技术》2020年第6期57-63,共7页Chinese Journal of Turbomachinery

基　　金：国家自然科学基金-联合基金项目(U1808214)。

摘　　要：API 617标准中规定,如果基础结构刚度在0~150%最大连续转速范围内大于轴承刚度的3.5倍,则在动力学计算中不需要考虑弹性基础的影响,反之则需要在动力学模型中加入弹性基础特性。目前很多实际应用的旋转机械都忽略了基础刚度的影响,这就导致一些机组的临界转速预估误差较大,使得转子在运行过程中振动过大。本文通过对压缩机轴承区进行动刚度测试,从而得到压缩机基础刚度的实测数据,并以多项式传递函数的形式,将弹性基础的特性引入到转子系统中。通过对转子系统横向振动的分析,得到基础特性的影响规律。分析结果表明基础特性会影响转子的动力学分析结果。According to API 617 standard,if the dynamic stiffness of the foundation structure is greater than 3.5 times the bearing stiffness within the range of 0~150%maximum continuous speed,the influence of the elastic suppout doesn’t need to consider in the dynamic calculation,otherwise,elastic support characteristics should be considered in the dynamic model.At present,the influence of foundation stiffness is often ignored in many practical rotating machineries,which causes large error in the prediction of critical speed and large rotor vibration in the process of operation.In this paper,the support dynamic stiffness were measured at the bearing locations and the support characteristics were considered in the rotor system using polynomial transfer functions extracted from the measured data.The effect of elastic support was obtained by rotor vibration analysis.The results show that the characteristics of support can affect the rotordynamic analysis results.

关 键 词：转子动力学分析 弹性基础特性 动刚度测试 传递函数 临界转速 

分 类 号：TH452[机械工程—机械制造及自动化] TK05[动力工程及工程热物理]