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研究了大型汽轮机长叶片的阻尼结构（凸肩或围带）对叶片振动的减振原理及效果．首先引入干摩擦非线性连接元，并进而推导出摩擦力附加刚度及附加阻尼矩阵，建立了有限元动力方程．其次用摩擦阻尼情况下的振型叠加法编制了有限元程序，研究叶片阻尼凸肩（围带）间的正压力与叶片响应的定量关系，找出了规律，在此基础上用８５１叶片作为算例，验证了干摩擦阻尼模型的合理性及程序的正确性
The damping principle and effect of the damping structure (shoulder or shroud) on the blade vibration of the large steam turbine blades are studied. Firstly, the dry friction nonlinear connection element is introduced, and then the additional frictional stiffness and additional damping matrix are deduced, and the finite element dynamic equation is established. Secondly, finite element program was developed by using the modal superposition method with frictional damping. The quantitative relationship between the positive pressure and the response of the blade on the damping shoulder (shroud) was studied and the law was found out. On the basis of this, An example is given to verify the rationality of the dry friction damping model and the correctness of the procedure