风电齿轮箱两级齿圈故障下振动信号幅值耦合调制建模  

Analysis and modeling of the vibration signal amplitude modulation of wind turbine gearboxes with compound faults

作　　者：辛红伟[1] 安伟伦 武英杰 刘少康 田野 王建国[1] XIN Hongwei;AN Weilun;WU Yingjie;LIU Shaokang;TIAN Ye;WANG Jianguo(School of Automation Engineering,Northeast Electric Power University,Jilin 132012,China;New Energy Branch,Huaneng Jilin Power Generation Co.,Ltd.,Jilin 130012,China;Jilin JEP New Energy Co.,Ltd.,Changchun 130015,China)

机构地区：[1]东北电力大学自动化工程学院,吉林吉林132012 [2]华能吉林发电有限公司新能源分公司,吉林吉林130012 [3]吉林吉电新能源有限公司,长春130015

出　　处：《振动与冲击》2021年第22期221-233,共13页Journal of Vibration and Shock

基　　金：吉林省科技发展计划重点科技研发项目(20180201004SF)。

摘　　要：风电齿轮箱的多级混合传动结构致使实测振动信号相互叠加、耦合调制,已有的单级轮系振动信号模型不能完全描述该现象,为此,提出一种针对级间串联调制与交叉调制现象的幅值耦合调制模型。采用基于Hilbert变换的幅值解调方法对耦合调制特性进行仿真分析,指出将多载波信号分解为单载波信号的必要性;采用常见的信号分解方法和传统窄带滤波法对齿轮箱振动信号进行分解,通过对比分析其特点,最终选定传统窄带滤波法;结合幅值解调分析两级齿圈故障下的级间耦合调制现象及不同测点处的耦合调制规律。结果表明:两级齿圈故障下,多个幅值调制频率形成了级间串联调制,且与多个载波形成交叉调制,验证了所提级间串联调制与交叉调制模型的合理性;通过对不同测点的振动信号分析,进一步验证了所建模型的有效性和实用性,为风电齿轮箱故障诊断提供模型支撑。The multi-stage hybrid transmission structure of a wind turbine gearbox causes the vibration signals at measuring points to be superimposed,coupled and modulated,which increases the difficulty in actual fault diagnosis.For this reason,the analysis and modeling of the gearbox vibration signal amplitude modulation is of practical engineering significance.The traditional narrow-band filtering method was adopted to perform band-pass filtering with the meshing frequencies of the gearbox as the center frequencies,and the modulation frequency of each frequency band under compound faults was determined by amplitude demodulation.In order to realize automatic signal decomposition,the effectiveness of typical wind turbine gearbox fault diagnosis methods based on signal adaptive decomposition was compared and analyzed.On this basis,a vibration signal model of the wind turbine gearbox considering the compound faults of the primary and secondary ring gears was established.The results show that under two-stage ring gear failure,multiple amplitude modulation frequencies form inter-stage series modulation,and form cross-modulation with multiple carriers,verifying the rationality of the proposed models for two-stage series modulation and cross-modulation.The analysis of vibration signals at different measuring points further verified the validity and practicability of the built model.The study provides support to the modelling for the fault diagnosis of wind power gearboxes.

关 键 词：风电齿轮箱 级间耦合调制 幅值调制 振动模型 

分 类 号：TH132[机械工程—机械制造及自动化] TP206.3[自动化与计算机技术—检测技术与自动化装置]