Dynamic design method of elastic ring squeeze film damper
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摘要: 弹性环式挤压油膜阻尼器(ERSFD)与传统挤压油膜阻尼器(SFD)相比,在动力特性方面具有一定的特色.以燃气涡轮发动机用ERSFD为对象,基于有限元挤压油膜理论对ERSFD的弹性环支承刚度、油膜压力场分布和油膜阻尼等特性进行了研究.根据ERSFD的结构特点,利用有限元法分析其动力特性不仅具有模型简单、计算量小的优点,而且能考虑到各种复杂的边界条件及封严装置.研究结果表明,本计算方法和结果可以作为ERSFD结构优化的依据.与SFD(Squeeze Film Damper)相比,ERSFD具有分段式油膜间隙,可利用弹性环的弹性变形来调整油膜间隙,将油膜间隙控制在一个合适的范围内,从而有效地避免传统SFD在一定工作条件下的非线性振动现象的发生.Abstract: A high efficient oil film damper which is known as elastic ring squeeze film damper (ERSFD) has special dynamical characteristics based on the conventional squeeze film damper (SFD). The characteristics of a gas turbine engine with ERSFD including the supporting stiffness of the elastic ring, the distribution of pressure field and oil film damping were investigated by taking advantage of the elastic deformation of the elastic ring. For ERSFD, finite element method not only has the advantages of simple modeling and small computation work, but also can be used in appropriate boundary conditions, for various damper sealing configurations. It was indicated that the calculative methods and results were put forward contributing to the preliminary design modification of the current body structure. Compared with SFD, the oil film clearance of ERSFD is divided into several parts. It can automatically adjust the oil film clearance by taking advantage of the elastic deformation of the elastic ring, which controls the oil film clearance in a suitable range. ERSFD has optimal effect on reducing nonlinear vibration markedly.
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Key words:
- squeeze oil film damper /
- elastic ring /
- supporting stiffness /
- flow damper /
- fluid-solid coupling
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