作者：张亮, 李欣

作者单位：辽宁工业大学机械工程与自动化学院, 辽宁 锦州 121001

关键词：失谐叶盘结构;CMS超单元法;子结构;模态测试;动力学特性

摘要：

为解决工作转速下失谐叶盘结构动力学特性分析计算量大的问题,提出一种近似CMS超单元法。该方法采用先预应力子结构后整体的分析方式,分析叶盘结构在工作转速下的动力学特性。通过循环对称分析法验证该方法的分析精度。采用模态测试及有限元法识别叶片失谐参数,基于近似CMS超单元方法分析某失谐叶盘结构在工作转速下的动力学特性。结果表明:谐调叶盘结构无量纲动频相对误差最大值为3.07%,满足分析精度要求。与循环对称分析法相比,近似CMS超单元法可用于谐调或周期失谐叶盘结构在工作转速下的动力学特性分析,并且适用于任意失谐叶盘结构。

Study on structural dynamics of mistuned bladed disk system based on approximate CMS method and modal testing

ZHANG Liang, LI Xin

Faculty of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou 121001, China

Abstract: In order to save the great computation effort for the structural dynamic characteristics analysis of mistuned bladed disk at working speed, an approximate CMS super-element method is proposed. The analysis mode from the prestressed substructure to the whole model is applied to analyze the dynamic characteristics of bladed disk system at working speed. Analysis accuracy of this method is verified by the cyclic symmetry analysis method. The mistuning parameter of blades is identified by modal testing and finite element method, and dynamic characteristics of mistuned bladed disk system at working speed are analyzed based on the approximate CMS super-element method. The results showed that the maximum relative error of dimensionless dynamic frequency of the tuned system is 3.07%, which is in conformity with the requirements of accuracy. Compared with the cyclic symmetry analysis method, this method not only can be used for the analysis of dynamic characteristics of tuned and cyclic mistuned bladed disk system at working speed, but also can be applied to the arbitrary mistuned bladed disk system.

Keywords: mistuned bladed disk system;CMS super-element method;substructure;modal testing;dynamic characteristics

2016, 42(6): 117-121  收稿日期: 2016-01-27;收到修改稿日期: 2016-03-03

基金项目: 国家自然科学基金项目(51505206);辽宁省教育厅科学研究一般项目(L2014246);辽宁工业大学教师科研启动基金(X201202)

作者简介: 张亮(1983-),男,辽宁葫芦岛市人,副教授,博士,研究方向为机械振动、转子动力学。

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