Abstract: 　The damping vibration performance of the blade after metallization of steam turbine blades is studied. The turbine impeller was simplified and then modeled by ug software, and the modal analysis is carried out on the integral blade disk of the same thickness of the aluminum, titanium, aluminum titanium film blade and the uncoated blade by ANSYS software. The vibration pattern and natural vibration frequency are obtained, and the vulnerable parts of the impeller are observed as a whole；Harmonic response analysis of a single blade,The deformation of the four blades under the same load was further analyzed, and their damping effects were discussed.Combined with the experimental results, the test specimens were subjected to aluminum plating, titanium plating, aluminum plating first and then titanium plating treatment, and uncoated specimens formed a control group.Testing the damping performance of coatings with a Dynamic Mechanical Thermal Analyzer (DMA).The results show that the deformation of each step mode of the blade after coating is smaller than that of the blade without coating，it can play a certain damping effect on the blade coating.

Key words: Metal film, Damping, Modal, Coating

摘要： 研究了汽轮机叶片镀金属薄膜后叶片的阻尼减振性能，将汽轮机叶轮合理简化后通过ug软件建模，运用ANSYS软件，对相同厚度的铝、钛、铝钛薄膜叶片试件及不镀膜的叶片试件等4种模型的整体叶盘进行模态分析，得到振型图和固有振动频率，从整体上观察叶轮的易损部位；对单个叶片进行谐响应分析，进一步分析4种叶片在外加同一载荷情况下的形变量，讨论其阻尼减振效果。结合实验结果，利用动态机械热分析仪（DMA），对镀铝、镀钛、先镀铝后镀钛处理的试件及不镀膜试件进行分析，检测涂层的阻尼性能。结果表明，镀膜后的叶片各阶模态的形变量均小于未镀膜叶片，对叶片镀膜具有一定的减震阻尼效果。

关键词: 金属薄膜, 　阻尼, 　模态, 　镀膜