一种选取最优解调频带新方法——Multigram  

A new method to select optimal demodulation frequency band:Multigram

作　　者：盛嘉玖 陈果[2] 贺志远 刘曜宾 王浩 尉询楷[3] SHENG Jiajiu;CHEN Guo;HE Zhiyuan;LIU Yaobin;WANG Hao;WEI Xunkai(College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;College of General Aviation and Flight,Nanjing University of Aeronautics and Astronautics,Liyang 213300,China;Beijing Aeronautical Engineering Technical Research Center,Beijing 100076,China)

机构地区：[1]南京航空航天大学民航学院,江苏南京211106 [2]南京航空航天大学通用航空与飞行学院,江苏溧阳213300 [3]北京航空工程技术研究中心,北京100076

出　　处：《推进技术》2024年第7期237-249,共13页Journal of Propulsion Technology

基　　金：国家科技重大专项(J2019-Ⅳ-004-0071);国家自然科学基金(52272436)。

摘　　要：针对Fast-Kurtogram易受非高斯噪声干扰的不足,提出一种基于多层滑动滤波器组,找寻最优解调频带的新方法——Multigram。首先,借鉴Protrugram滑动分割频带思想,构建多层、多滤波中心和带宽的滤波组。然后,根据各层不同滤波中心和带宽依次进行带通滤波,对滤波信号进行包络自相关谱分析,在容差范围内计算谱峭度,以选取最优解调频带。最后,采用最优滤波中心和带宽进行带通滤波和包络谱分析。将方法应用于滚动轴承故障诊断,基于机匣测点的模拟故障轴承试验和自然故障轴承试验结果表明:该方法可有效选取适宜的解调频带,相比于Fast-Kurtogram,Protrugram,Autogram和Infogram,诊断结果更具优势。In order to solve the problem that Fast-Kurtogram was susceptible to non-Gaussian noise,a new method called Multigram based on multilayer sliding filter banks was proposed to find the optimal demodulation frequency band.Firstly,using the idea of Protrugram sliding band segmentation,a filter group of multi-layer,multi-filtering center and band was constructed.Then,according to the different filtering centers and band of each layer,the bandpass filtering was carried out successively.The envelope,autocorrelation,and spectrum analysis were carried out for the filtered signal.After that the spectral kurtosis was calculated within the tolerance range to select the optimal demodulation frequency band.Finally,the optimal filtering center and band were used for bandpass filtering and envelope spectrum analysis.The proposed method was applied to the fault diagnosis of rolling bearings.The results of the simulated fault bearing test and the natural fault bearing test based on the mea-suring points of the casing show that the proposed method can effectively select the appropriate demodulation fre-quency band,and the diagnosis results are more superior than those of Fast-Kurtogram,Protrugram,Autogram and Infogram.

关 键 词：故障诊断 滚动轴承 Multigram 共振解调 最优解调频带 

分 类 号：V263.3[航空宇航科学与技术—航空宇航制造工程]