具有不对中故障的双跨转子系统非线性动力学特性

doi:10.3901/JME.2020.16.109

机械工程学报 ›› 2020, Vol. 56 ›› Issue (16): 109-117.doi: 10.3901/JME.2020.16.109

• 可再生能源与工程热物理 • 上一篇下一篇

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具有不对中故障的双跨转子系统非线性动力学特性

甄满^1,2, 田拥胜¹, 孙涛¹, 张华良^1,2, 谭春青^1,2

1. 中国科学院工程热物理研究所北京 100190;
2. 中国科学院大学工程科学学院北京 100049

收稿日期:2019-12-21 修回日期:2020-03-15 出版日期:2020-08-20 发布日期:2020-10-19
通讯作者: 田拥胜(通信作者),男,1983年出生,高级工程师。主要研究方向为燃气轮机振动分析,轴承-转子动力学。E-mail:tianyongsheng@iet.cn
作者简介:甄满,男,1991年出生。主要研究方向为转子动力学。E-mail:zhenman2@163.com
基金资助:
国家重点研发计划（2018YFB0905101）和中国科学院创新基金（16s034）资助项目。

Nonlinear Dynamics of Two-span Rotor-bearing System with Flexible Coupling Misalignment

ZHEN Man^1,2, TIAN Yongsheng¹, SUN Tao¹, ZHANG Hualiang^1,2, TAN Chunqing^1,2

1. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190;
2. School of Engineering Science, University of Chinese Academy of Science, Beijing 100049

Received:2019-12-21 Revised:2020-03-15 Online:2020-08-20 Published:2020-10-19

摘要/Abstract

摘要： 目前，高速直驱式转子系统成为一种重要的发展趋势，为了研究多跨转子系统在弹性联轴器联接下含有不对中故障的多圆盘轴承-双跨转子动力学模型，通过将联轴器质量矩阵和刚度矩阵作为总体质量和刚度矩阵的一部分，并考虑重力、不平衡力、油膜力和不对中力的作用，采用Newmark-β方法求解运动微分方程，获得双跨转子系统的振动响应。对比研究有无不对中故障下系统的动力特性，采用轴心轨迹图、分叉图、Poincare映射图和FFT频谱图分析了平行不对中度、角向不对中度和联轴器刚度对转子动力学响应的影响。分析结果表明，不对中度会使系统的非线性特征更加复杂，但对转子系统的失稳转速作用不明显；膜盘联轴器径向刚度增大后，转子系统出现强2×响应并产生4×和6×的偶数倍频分量，联轴器角向刚度的增加会提高转子系统的失稳转速和2×振动分量。研究结果可对转子系统结构设计和故障诊断提供理论参考。

关键词: 弹性联轴器, 平行不对中, 角向不对中, 联轴器刚度

Abstract: At present, the high-speed direct-drive rotor system has become an important development trend. In order to research the dynamic model of a multi-span rotor system with a multi-disc bearing and a two-span rotor that contains misalignment faults under the coupling of an elastic coupling, the coupling mass matrix and stiffness matrix are used as part of the overall mass and stiffness matrix. Considering the effects of gravity, unbalanced force, oil film force, and misalignment force, taking Newmark-β method to solve the differential equation of motion, and obtaining the vibration response of the two-span rotor system. The dynamic characteristics of the systems with or without misalignment are compared and discussed. The effects of parallel misalignment, angular misalignment and coupling stiffness on the response of the system are studied with orbit plot, bifurcation diagram, Poincare section and spectrum diagram. Results suggest that the misalignment will make the nonlinear characteristics of the system more complicated, but it will not have a significant effect on the instability speed of the rotor system. After the radial stiffness of the diaphragm coupling increases, the rotor system produces strong 2×vibration response and 4×, 6×even frequency components, the increase of the angular stiffness of the coupling increases the instability speed and 2×vibration response. The research results can provide a theoretical reference for the structural design and fault diagnosis of the rotor system.

Key words: flexible coupling, parallel misalignment, angular misalignment, coupling stiffness

中图分类号:

TG156

甄满, 田拥胜, 孙涛, 张华良, 谭春青. 具有不对中故障的双跨转子系统非线性动力学特性[J]. 机械工程学报, 2020, 56(16): 109-117.

ZHEN Man, TIAN Yongsheng, SUN Tao, ZHANG Hualiang, TAN Chunqing. Nonlinear Dynamics of Two-span Rotor-bearing System with Flexible Coupling Misalignment[J]. Journal of Mechanical Engineering, 2020, 56(16): 109-117.

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具有不对中故障的双跨转子系统非线性动力学特性

Nonlinear Dynamics of Two-span Rotor-bearing System with Flexible Coupling Misalignment

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