静偏心对挤压油膜阻尼器减振特性影响实验研究

发布时间：2019-04-13 17:31

【摘要】：为研究静偏心对挤压油膜阻尼器减振特性的影响,设计了可单独改变油膜间隙的柔性转子系统,针对不同静偏心条件下,阻尼器减振性能,转子的抗振性能和非线性振动特征进行了实验研究。结果表明:静偏心会导致转子系统临界转速增大;静偏心比εs小于0.6,转子临界峰值随静偏心比增大而减小,εs在0.6~1.0范围内增大时临界峰值随静偏心比增大而大幅增大;εs增大时阻尼器失效不平衡量大幅减小,转子不平衡裕度和抗振性能大幅下降,将εs控制在0.2以内时,静偏心不会恶化阻尼器的阻尼效果;静偏心比(εs0.2)较小时,阻尼器失效表现为典型双稳态跳跃,静偏心比(εs0.3)较大条件下,阻尼器失效时可能表现出软弹簧非线性振动与非协调振动;根据阻尼器失效转子振动特征可判断阻尼器静偏心水平。
[Abstract]:In order to study the influence of static eccentricity on the damping characteristics of squeeze film damper (SFD), a flexible rotor system which can change the oil film clearance is designed, and the damping performance of the damper under different static eccentricity conditions is studied. The anti-vibration performance and nonlinear vibration characteristics of rotor are studied experimentally. The results show that static eccentricity will increase the critical speed of rotor system. When the static eccentricity ratio 蔚 s is less than 0.6, the critical peak value of the rotor decreases with the increase of the static eccentricity ratio, and the critical peak value increases greatly with the increase of the static eccentricity ratio when 蔚 s increases in the range of 0.6? When 蔚 s increases, the failure unbalance of the damper decreases greatly, and the unbalance margin and anti-vibration performance of the rotor decrease greatly. When 蔚 s is controlled within 0.2, the damping effect of the damper will not be worsened by the static eccentricity. When the static eccentricity ratio (蔚 s 0.2) is small, the failure of the damper appears to be a typical bistable jump. When the static eccentricity ratio (蔚 s 0.3) is large, the failure of the damper may exhibit non-linear and non-conforming vibration of the soft spring. The static eccentricity of the damper can be judged according to the vibration characteristics of the rotor with failure of the damper.
【作者单位】：西北工业大学动力与能源学院;中国航空工业集团沈阳发动机设计研究所;
【分类号】：V231.92

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