轴承径向游隙对刚性转子不平衡响应的影响研究  

Investigation on Influence of Bearing Radial Clearance on Unbalance Response of Rigid Rotor

作　　者：金路[1] 苗旭升[1] 王晓锋[1] 黄道琼[1] 李惠敏[1] JIN Lu;MIAO Xusheng;WANG Xiaofeng;HUANG Daoqiong;LI Huimin(Xi'an Aerospace Propulsion Institute, Xi'an 710100, China)

机构地区：[1]西安航天动力研究所,西安710100

出　　处：《轴承》2019年第5期41-43,48,共4页Bearing

基　　金：国家重大基础研究项目(613321)

摘　　要：针对某涡轮泵拟刚性转子振动较大的问题,在考虑轴承径向游隙的情况下,建立Jeffcott转子模型,对转子的不平衡响应进行分析,研究表明:随着轴承径向游隙增大,临界转速以下的不平衡响应幅值增大,在80%临界转速处,10倍偏心距的轴承径向游隙会产生15.5倍无轴承径向游隙的不平衡响应。因此,在亚临界转速下工作时,可采用预紧装置适当减小轴承径向游隙,降低转子-支承系统的振动。加装预紧装置的试验结果表明,施加2 000 N轴向预紧力时,转速8 000 r/min以下的转子振动幅值降低40.6%,验证了理论推导的正确性。Aimed at larger vibration of pseudo rigid rotor in a turbopump, the Jeffcott model is built to analysis unbalance response of rotor based on consideration of bearing radial clearance. The research results indicate that the unbalance response amplitude under critical speed is increased with increase of bearing radial clearance. Under the rotational speed which is 80% of critical speed, the unbalance response of rotor with bearing radial clearance of ten times of eccentricity is 15.5 times of rotor without bearing radial clearance. As a result, the bearing radial clearance is reduced properly by pretightening device to reduce vibration of rotor-supporting system under subcritical speed. The experimental results show that the vibration amplitude of rotor under rotational speed of 8 000 r/min and axial preload of 2 000 N is reduced by 40.6%, which verifies correctness of theoretical derivation.

关 键 词：滚动轴承 径向游隙 径向刚度 不平衡响应 

分 类 号：TH133.33[机械工程—机械制造及自动化] TH113.1