模态频率灵敏度在叶片修频工艺中的应用  

The Application of Modal Frequency Sensitivity Theory in the Process of Adjusting Blade Natural Frequency

作　　者：孔卫凯 王学林[1] 叶松涛[1] 张家军 

机构地区：[1]华中科技大学机械科学与工程学院,湖北武汉430074 [2]无锡透平叶片有限公司工艺研究所,江苏无锡214174

出　　处：《机械设计与制造》2014年第8期75-77,共3页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(51375184)

摘　　要：当汽轮机叶片静频测量结果不符合工艺要求时,需要对叶片表面修整打磨(修型)来调整叶片固有频率。原始修频工艺采用试验的方法,即打磨叶片表面不同区域并记录频率变化,这种方法报废率高且增加了时间成本。提出了在模态分析理论基础上,建立一种适合工程应用的叶片频率灵敏度计算方法,此方法概念清晰、操作简便。以某一型号叶片为例,对该计算方法进行了验证,并对叶片抛磨后的结果与预期进行了对比。实验证明,此方法能快速准确的预测抛磨区域、抛磨量对叶片固有频率的增量。It is an effective approach to fixing the blade form surface by grinding machine for the blade which natural frequency does not meet the design requirements. The old way of adjusting the natural frequency of blade is repeating grind different parts of the blade and then recording the frequency changes, which can be time -waste and high -scraping-rate. Based on the modal analysis theory, a method is presented to calculate the sensitivity of blade frequency. It has the advantage of clear concept and easy operation. Finally, one example is used to show the effectiveness and accuracy of the result. It is shown that the proposed method can predict the frequency increment before fixing the blade more quickly and accurately.

关 键 词：汽轮机叶片 叶片频率 磨削 模态灵敏度分析 有限元 复杂曲面 

分 类 号：TH16[机械工程—机械制造及自动化] O032[理学]