摘要
分析了挤压油膜阻尼器的流体惯性力对柔性转子的非线性双稳态响应及非协调响应的影响。研究表明，惯性力的影响越大，挤压油膜阻尼器的刚度力越小，阻尼力越大，从而导致系统稳态响应的峰值转速降低，振幅减小。流体惯性力对系统在亚临界及超临界的双稳态响应及非协调响应具有明显的抑制作用。惯性力越大，产生双稳态响应或非协调响应的转速范围越小，非协调谐波分量越小，但有时惯性力太大也会引起新的非协调响应。
Previous studies of this important problem have been quite limited. We discussed that fluid inertia forces, long neglected in the design of aeroengine rotor supported on squeezefilmdamper bearings, exert appreciable influence and thus should not be neglected in engineering design. In order to compute the effects of fluid inertia forces, we started form the wellknown NavierStokes equation and derived Eqs.(5) and (6). They indicate that inertia forces are directly proportional to Reynolds number and that inertia forces are nonlinear functions of the displacement, velocity, and acceleration of the rotor axis at the bearings. The effects of fluid inertia forces on bistable responses were calculated and shown in Fig.1. Calculations were done mainly with Eq.(11).Figs.1a and 1b are for two different sets of parameters respectively. In Fig.1 ε-Ω curves for three different values of R es are shown; ε is the response, Ω is the ratio of rotor frequency to natural frequency and R es is Reynolds number divided by Ω . Fig.1 shows that inertia forces have obvious suppression effect on bistable response. The effects of fluid inertia forces on nonsynchronous responses were calculated and shown in Figs.2 through 4. Calculations were done by numerically integrating eqs.(1) through (4). Figs.2 through 4 are for three different sets of parameters. Figs.2 through 4 show that inertia forces in general have suppressing effect on nonsynchronous response. Occasionally, such as in Fig.2, excessive inertia forces do not have suppressing effect.
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
1997年第2期294-299,共6页
Journal of Northwestern Polytechnical University
基金
霍英东青年教师基金
国家自然科学基金
关键词
挤压油膜阻尼器
惯性力
非协调响应
转子
阻尼器
squeeze film damper, fluid inertia force, bistable response, nonsynchronous response
