螺栓连接组合Jeffcott转子界面滑移规律分析

Interface Slip Analysis of Combined Jeffcott Rotor With Bolted Joint

针对航空发动机转子实际装配完成后连接界面力学特性分布不均匀、服役阶段连接界面发生微动滑移等问题,以组合Jeffcott转子为研究对象,综合考虑实际螺栓预紧力分布规律,首先对高速旋转状态下的组合转子连接界面开展受力分析,揭示了预紧力对连接界面滑移的影响机制。其次基于实测预紧力数据构建了组合Jeffcott转子有限元模型,对连接界面滑移过程进行了仿真。最后系统分析了预紧力均值大小及离散度对转子界面滑移规律的影响。结果表明,预紧力均值大小主要影响界面滑移量,对滑移分布的均匀性影响较小,而预紧力分散度大小会显著影响滑移分布的均匀性。实际装配过程中,可通过降低螺栓预紧力分布的离散度来减小因界面非均匀滑移对组合转子连接性能带来的不利影响。

Aiming at the problems of uneven distribution of mechanical properties of the connection interface after the actual assembly of aero-engine rotor and the fretting slip of the connection interface during service,this paper takes the combined Jeffcott rotor as the research object and comprehensively considers the distribution law of the actual bolt preload.Firstly,the mechanical analysis of the connection interface of the combined rotor under high-speed rotation is carried out,and influence mechanism of the preload on the connection interface slip is revealed.Secondly,based on the measured preload data,the finite element model of combined Jeffcott rotor is constructed to simulate the slip process of the connection interface.Finally,the influence of the mean value and dispersion of preload on the slip law of rotor interface is systematically analyzed.The results show that the mean value of preload mainly affects the amount of interface slip,but has little effect on the uniformity of slip distribution,while the dispersion of preload will significantly affect the uniformity of slip distribution.In the actual assembly process,by reducing the dispersion of bolt preload distribution,the adverse effect of interface non-uniform slip on the connection performance of combined rotor can be reduced.