静偏心对挤压油膜阻尼器减振特性影响实验研究

推进技术 ›› 2016, Vol. 37 ›› Issue (8): 1560-1568.

静偏心对挤压油膜阻尼器减振特性影响实验研究

刘展翅¹,廖明夫¹,丛佩红²,李岩¹,王娟²,王四季¹

西北工业大学动力与能源学院，陕西西安 710072,西北工业大学动力与能源学院，陕西西安 710072,中国航空工业集团沈阳发动机设计研究所，辽宁沈阳 110015,西北工业大学动力与能源学院，陕西西安 710072,中国航空工业集团沈阳发动机设计研究所，辽宁沈阳 110015,西北工业大学动力与能源学院，陕西西安 710072

发布日期:2021-08-15
作者简介:刘展翅，男，博士生，研究领域为航空发动机结构动力学，转子动力学。

Experimental Investigation for Effects of Static Eccentricity on Vibration Attenuating Characteristics of Squeeze Film Damper

School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,Shenyang Engine Design and Research Institute，Aviation Industry Corporation of China，Shenyang 110015，China,School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China,Shenyang Engine Design and Research Institute，Aviation Industry Corporation of China，Shenyang 110015，China and School of Power and Energy，Northwestern Polytechnical University，Xi’an 710072，China

Published:2021-08-15

摘要/Abstract

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([εs]<0.2)较小时，阻尼器失效表现为典型双稳态跳跃，静偏心比([εs]>0.3)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。

关键词: 航空发动机；挤压油膜阻尼器；静偏心；机械振动；非线性振动

Abstract: A flexible rotor system with squeeze film damper (SFD) was constructed and the static eccentricity of the SFD can be altered independently. Performance of the damper，resistance capability for the vibration and the character of the nonlinear vibration of the rotor are experimentally investigated under different static eccentricity level. The results reveal that the static eccentricity results in the increase of the critical speed. Critical amplitude decreases with the increase of the static eccentricity ratio [εs] when [εs]< 0.6，while the critical amplitude increases sharply with the increase of the static eccentricity ratio when 0.6 <[εs]< 1. When the static eccentricity rises，the unbalance of failure of attenuating vibration for the damper decreases significantly and the vibration resistance ability of the rotor is also influenced greatly. The static eccentricity ratio should be less than 0.2 to insure effective damping performances of SFD. The bistable jump phenomena are observed with a low level static eccentricity ([εs]<0.2)，while the non-linear soften-spring effect and the nonsynchronous vibration can be observed with a high level static eccentricity ([εs]>0.3)，when the failure of attenuating vibration happens. The vibration characteristics when damper fail to attenuate vibration can be used to identify the static eccentricity level of the damper.

Key words: Aero-engine；Squeeze film damper；Static eccentricity；Mechanical vibration；Non-linear vibration

刘展翅,廖明夫,丛佩红,李岩,王娟,王四季. 静偏心对挤压油膜阻尼器减振特性影响实验研究[J]. 推进技术, 2016, 37(8): 1560-1568.

LIU Zhan-chi¹,LIAO Ming-fu¹,CONG Pei-hong²,LI Yan¹,WANG Juan²,WANG Si-ji¹. Experimental Investigation for Effects of Static Eccentricity on Vibration Attenuating Characteristics of Squeeze Film Damper[J]. Journal of Propulsion Technology, 2016, 37(8): 1560-1568.

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