摘要
基于非线性输出频率响应函数(NOFRF)的独特优势,将非线性输出频率响应函数引入到转子不对中-碰摩耦合故障中,提出了基于非线性输出频率响应函数的转子不对中-碰摩耦合故障诊断方法。利用提出的方法辨识得到了不同对中度及其角度的转子系统的NOFRF值,对比分析了不对中度及其角度对转子系统各阶NOFRF值的影响。仿真结果表明随着不对中度和角度的增加,NOFRF中二次谐波二阶非线性输出频率响应函数和二次谐波四阶非线性输出频率响应函数有着较为明显的增幅;一次谐波三阶非线性输出频率响应函数随不对中角度的增加而减小。因此,可以依据二次谐波二阶非线性输出频率响应函数、二次谐波四阶非线性输出频率响应函数、一次谐波三阶非线性输出频率响应函数值的变化规律识别转子系统的不对中程度。最后通过试验结果验证了仿真结果的正确性,研究成果为具有不对中-碰摩耦合故障的转子系统的故障诊断提供了重要的依据。
Based on the unique advantages of the nonlinear output frequency response function(NOFRF), the nonlinear output frequency response function is introduced to the rotor system with coupling faults of misalignment and rub-impact, a fault diagnosis method based on NOFRF for coupling faults of misalignment and rub-impact is proposed. The proposed method used to identify the NOFRF values of rotor systems with different degrees of misalignment and different angles, and the influence of misalignment and angle on the NOFRF values of various orders of the rotor system is analyzed. The simulation results show that the second harmonic second-order NOFRF value and the fourth-order NOFRF value have a significant increase with the increase of misalignment and angle. The first harmonic third-order NOFRF value decreases with the increase of misalignment angle. Therefore, the degree of misalignment of the rotor system can be identified based on the variation of the second harmonic second-order NOFRF value, the second harmonic fourth-order NOFRF value and the first harmonic third-order NOFRF value. Finally, the experimental results verify the correctness of the simulation results. The research results obtained provide an important evidence for fault diagnosis of rotor systems with coupling faults of misalignment and rub-impact.
作者
李志农
李云龙
刁海洋
LI Zhinong;LI Yunlong;DIAO Haiyang(Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330063)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第19期84-91,共8页
Journal of Mechanical Engineering
基金
国家自然科学基金(51675258,51075372,51265039)
江西省教育厅科学技术研究项目(GJJ150699)
机械传动国家重点实验室开放基金(SKLMT-KFKT-201514)资助项目
关键词
非线性输出频率响应函数
转子不对中
碰摩
故障诊断
系统辨识
nonlinear output frequency response function
rotor misalignment
rubbing
fault diagnosis
system identification
