赵项伟,罗贵火,王飞.静偏心对挤压油膜阻尼器减振特性影响的
数值分析[J].航空发动机,2018,44(3):42-48 |
静偏心对挤压油膜阻尼器减振特性影响的
数值分析 |
Numerical Analysis of Effects of Static Eccentricity on VibrationCharacteristics of Squeeze Film Damper |
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DOI: |
中文关键词: 减振特性 挤压油膜阻尼器 静偏心 转子 轴心轨迹 |
英文关键词:vibration characteristics Squeeze Film Damper static eccentricity rotor shaft orbit |
基金项目: |
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中文摘要: |
由于装配误差或重力等原因,挤压油膜阻尼器在实际使用中难以避免产生静偏心。为了研究静偏心对挤压油膜阻尼器
减振特性的影响,基于广义雷诺方程推导出静偏心条件下挤压油膜阻尼器雷诺方程并建立了静偏心挤压油膜阻尼器- 转子系统
的动力学模型,随后运用数值积分获取静偏心下转子系统的非线性响应。研究表明:转子进动半径随着静偏心增大而减小;静偏心
显著影响转子轴心轨迹,静偏心时转子轴心轨迹在大多数转速下近似为椭圆而不再是圆,静偏心下突加不平衡响应瞬态振幅远高
于无静偏心条件下瞬态振幅。 |
英文摘要: |
Due to the assembly error or the weight, the static eccentricity can't be avoided in use of SFD (Squeeze Film Damper). To
research the effects of static eccentricity on vibration characteristics of the SFD, the Reynolds equation of SFD under conditions of static
eccentricity was derived based on generalized Reynolds equation,, and a dynamic model of the SFD with static eccentricity- rotor system
was established. Then, the nonlinear response of the rotor system under conditions of static eccentricity was obtained by using numerical
integration. The results show that the rotor precession radius decreases with the static eccentricity; the static eccentricity has a marked
influence on the rotor shaft orbit, when there is static eccentricity, the rotor shaft orbit is close to ellipse instead of circle at most speeds, and
the instantaneous amplitude of sudden unbalance response is far above that without static eccentricity. |
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