円弧バネ型ダンパのロータダイナミック係数の実験的同定

抄録

This paper presents an experimental evaluation of dynamic characteristics of arc spring dampers which reduce the vibration of rotating machinery. Arc spring damper is a recently proposed oil-film damper that has two or more arc-shaped centering springs and multi-layered oil films formed by Wire Electric Discharge Machining (WEDM). They require less space and weight than those of conventional Squeeze Film Dampers (SFDs) with squirrel cage springs. However, the basic characteristics of arc spring dampers, which include the influence of the number of arc springs, added mass coefficients, and cross-coupled terms have not been investigated so far. In the present study, a series of centered, unidirectional excitation tests on 2 types of arc spring dampers which have different arc patterns are conducted to identify their damping coefficients and added mass coefficients. The following are main findings of this study: (1) 4-arc type has larger direct damping coefficients in comparison with 2-arc type; (2) Arc spring dampers can have considerable amount of added mass and small amount of cross-coupled coefficients.