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Nonlinear response analysis of aero-engine rotor bearing rub-impact system caused by horizontal yawing maneuver load
International Journal of Non-Linear Mechanics ( IF 3.2 ) Pub Date : 2021-08-05 , DOI: 10.1016/j.ijnonlinmec.2021.103800
Wujiu Pan 1, 2, 3 , Liangyu Ling 1, 2 , Haoyong Qu 1, 2 , Minghai Wang 1, 2
Affiliation  

Based on the simplified aero-engine rotor system, a new nonlinear response prediction model of rotor bearing rub-impact system is established. Different from the traditional rotor system rub-impact model, based on the detailed characteristics of the blade–disc system, this paper considers the influence of the number of blades and the dynamic to static clearance on the rub-impact force. In addition, the influence of additional load on the established rotor-bearing system due to the change in the flight motion state of the horizontal yawing maneuver is also considered The Newmark-β numerical method is used to solve the system, and the effects of maneuver load and rub-impact stiffness on the nonlinear dynamics of the system are studied The results show that the system produces a kind of sub harmonic resonance rub-impact phenomenon, that is, the system will produce 1/2 sub harmonic resonance under the action of maneuver load near the double critical speed, which will increase the vibration response amplitude of the system. With the increase of maneuver load, the system always has complex nonlinear phenomenon; with the increase of rub-impact stiffness, the system produces a large number of frequency division and frequency multiplication components, which can be used as the characteristic frequency of rub-impact faults.



中文翻译:

水平偏航机动载荷引起的航空发动机转子轴承摩擦系统非线性响应分析

基于简化的航空发动机转子系统,建立了一种新的转子轴承摩擦系统非线性响应预测模型。与传统的转子系统摩擦模型不同,本文基于叶片-盘系统的详细特性,考虑了叶片数量和动静间隙对摩擦力的影响。此外,还考虑了由于水平偏航机动飞行运动状态的变化对已建立的转子轴承系统的附加载荷的影响。β采用数值方法求解系统,研究了机动载荷和摩擦刚度对系统非线性动力学的影响,结果表明系统产生了一种次谐波共振摩擦现象,即:系统在接近双临界速度的机动载荷作用下会产生1/2次谐波共振,增加系统的振动响应幅值。随着机动载荷的增加,系统始终存在复杂的非线性现象;随着摩擦刚度的增加,系统产生大量的分频和倍频分量,可作为摩擦故障的特征频率。

更新日期:2021-08-16
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