基于子结构法的汽轮发电机组模型轴系及弹簧基础模态分析  

Modal Analysis of Shafting and Spring Foundation of Turbo-Generator Model Using CMS Method

作　　者：蒋俊 李汪繁 王秀瑾 孙庆 危奇 BANG Jun;LI Wang-fan;WANG Xiu-jin;SUN Qing;WEI Qi(Shanghai Power Equipment Research Institute Company Limited, Shanghai 200240, Chin)

机构地区：[1]上海发电设备成套设计研究院有限责任公司,上海200240

出　　处：《汽轮机技术》2018年第2期123-126,共4页Turbine Technology

基　　金：国家科技重大专项课题资助项目(2012ZX06002-017-01-04)

摘　　要：针对有限元法分析大型汽轮发电机组轴系及弹簧基础模态时节点数多、求解困难的问题,在计算中引入了子结构模态综合法(CMS)。以某轴系及弹簧基础模型试验台为研究对象,建立了三维有限元模型,应用CMS法进行了联合模态分析;同时采用锤击法对试验台顶台板进行了模态测试。研究结果表明:采用CMS法与直接有限元法在单独计算弹簧基础模态频率时误差极小,在0.13%以内;基于CMS法的顶台板拓展结果与顶台板模态实测结果较为吻合,模态频率误差在工程允许范围内;CMS法作为一种解决复杂结构动力学问题的方法可以有效地应用于轴系及弹簧基础的模态分析。To solve the problem of multi nodes and hard achievement in modal analysis of large-scale turbo-generator shafting and spring foundation with three-dimensional finite element method（ FEM）,the component mode synthesis（ CMS） method was introduced. Taking a shafting and spring foundation model test bed as the study object,the FEM analysis and modal test were both carried out. The results show that the error is within 0. 13% when using the CMS method and the direct FEM to calculate the spring foundation modal frequencies. The calculated modal expansion result of top platen is nearly consistent with the modal test result. The error is within the engineering allowable range. The CMS method can be applied to the shafting and spring foundation modal analysis as an effective solution to the complex structural mechanical problems.

关 键 词：汽轮发电机组 子结构模态综合法 轴系 弹簧基础 模态分析 

分 类 号：TM311[电气工程—电机]