Applications of a Ridgeline Extraction Method in Bearing Fault Diagnosis

doi:10.3969/j.issn.1004-132X.2021.10.003

Abstract

Abstract: To solve the problems of low ridgeline identification ability and differences between the extracted ridge and the actual ridge in Crazy Climber algorithm, the Climbers movement rule and local optimal peak extraction method in the algorithm were improved. An improved Crazy Climber algorithm was proposed. First, STFT was applied to the time-domain signals to obtain the time-frequency matrix, and then the improved Crazy Climber algorithm was used to extract the time-frequency matrix to obtain the time-frequency ridge that might reflect the frequency changes with time. The simulation signal analyses prove that this method is superior to the original Crazy Climber algorithm. The method is used in the fault diagnosis of bearings, and the fault order is accurately extracted.

Key words: time-frequency analysis, short-time Fourier transform(STFT), Crazy Climber algorithm, ridgeline extraction, fault diagnosis

摘要： 针对Crazy Climber算法脊线识别能力低、提取脊线与实际脊线有差距等问题，通过对该算法中Climber的移动规则和局部最优峰值提取方法进行改进，提出了一种改进的Crazy Climber算法。首先对时域信号进行短时傅里叶变换获取时频矩阵，再用改进的Crazy Climber算法对时频矩阵进行脊线提取，最终获得可以反映频率随时间变化的时频脊线。仿真信号分析结果证明了该算法优于原始的Crazy Climber算法。将该算法用于轴承的故障诊断中，可准确提取故障阶次。

关键词: 时频分析, 短时傅里叶变换, Crazy Climber算法, 脊线提取, 故障诊断

CLC Number:

TH17

CHEN Jian, YANG Bin, HUANG Kaixuan, CAI Kunqi, LIU Yuanyuan, LIU Xingfu, . Applications of a Ridgeline Extraction Method in Bearing Fault Diagnosis[J]. China Mechanical Engineering, 2021, 32(10): 1157-1163.

陈剑, 杨斌, 黄凯旋, 蔡坤奇, 刘圆圆, 刘幸福, . 一种脊线提取方法在轴承故障诊断中的应用[J]. 中国机械工程, 2021, 32(10): 1157-1163.

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