Nonlinear Vibration of Bolted Rotor Bearing System Accounting for the Bending Stiffness Characteristics of the Connection Interface

Wujiu Pan, Liangyu Ling, Haoyong Qu, Minghai Wang
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引用次数: 1

Abstract

This paper considers the discontinuous characteristics of a real aero-engine rotor system, that is, the existence of bolted connection characteristics, and establishes a new bolted connection rotor system model. Taking into account the bending stiffness and the nonlinear Hertzian contact force of the rolling bearing, the Newmark-[Formula: see text] numerical method is used to solve the system response, and the influence of the bending stiffness on the system is studied. Moreover, the effects of bending stiffness and eccentricity on the system dynamics are analyzed. The results show that the nonlinear phenomena of the system are more abundant and the critical speed of the system is higher when the bending stiffness is involved. With the increase of bending stiffness, the critical speed of the system increases, and the frequency component of the system becomes more complex. Then, the influence of eccentricity on the system is studied based on the bending stiffness. It is found that the greater the eccentricity, the greater the critical speed of the rotor and the greater the amplitude of the main frequency. In the case of the same eccentricity, the main frequency increases as the rotational speed increases, and the frequency doubling component appears in the 2-period motion. This paper provides a basis for predicting the nonlinear response of bolted rotor-bearing system.
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考虑连接界面弯曲刚度特性的螺栓转子轴承系统非线性振动
本文考虑了实际航空发动机转子系统的不连续特性,即螺栓连接特性的存在,建立了新的螺栓连接转子系统模型。考虑滚动轴承的弯曲刚度和非线性赫兹接触力,采用Newmark-[公式:见文]数值方法求解系统响应,研究了弯曲刚度对系统的影响。此外,还分析了弯曲刚度和偏心距对系统动力学的影响。结果表明,当考虑弯曲刚度时,系统的非线性现象更加丰富,系统的临界速度更高。随着弯曲刚度的增大,系统的临界转速增大,系统的频率分量变得更加复杂。在此基础上,研究了偏心距对系统弯曲刚度的影响。结果表明,偏心距越大,转子临界转速越大,主频率幅值越大。在偏心距相同的情况下,主频率随转速的增加而增加,在2周期运动中出现倍频分量。为预测螺栓转子-轴承系统的非线性响应提供了依据。
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