基于线调频小波路径追踪和逐步解调滤波的滚动轴承故障诊断

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (11) : 88-94.

论文

刘东东，程卫东，温伟刚

作者信息 +

Rolling element bearing fault diagnosis based on CPP and stepwise demodulation filtering

LIU Dongdong, CHENG Weidong, WEN Weigang

Author information +

文章历史 +

摘要

在变转速工况下诊断滚动轴承故障时，广义解调算法中相位函数的确定依赖转速计等辅助设备。针对这一问题，提出了基于线调频小波路径追踪(Chirplet path pursuit, CPP)和逐步解调滤波的滚动轴承故障诊断方法。瞬时故障特征频率(Instantaneous fault characteristic frequency, IFCF)在包络信号中具有幅值优势，利用这一特点，使用CPP算法从降采样的包络信号中提取IFCF趋势线，构造IFCF的相位函数。针对转频在信号中难以提取这一问题，采用重复估计转频的方式，计算潜在转频的相位函数。根据IFCF和转频的相位函数，构造逐步解调滤波算法，既可以恢复时变频率的周期性，又能降低噪声干扰，避免幅值较小的转频被噪声淹没。根据IFCF和转频在解调频谱的比值，判断故障位置。仿真和实验信号的处理结果证明了算法的有效性。

Abstract

When performing rolling bearing fault diagnosis under time-varying rotating speed condition, the determination of phase function in the generalized demodulation algorithm depends upon tachometer and other auxiliary equipment. Aiming at this problem, a rolling element bearing fault diagnosis method based on the chirplet path pursuit (CPP) and stepwise demodulation filtering was proposed. The instantaneous fault characteristic frequency (IFCF) in envelope signals has the amplitude advantage. Adopting this feature, CPP algorithm was used to extract the trend curve of IFCF from down-sampled envelope signals and construct IFCF’s phase function. Aiming at the problem of bearing instantaneous rotating frequency (IRF) being difficult to extract in signals, the method of repeated estimation of IRF was used to calculate phase functions of potential IRFs. According to phase functions of IFCF and IRF, the stepwise demodulation filtering algorithm was constructed to recover the periodicity of time-varying frequency, reduce noise interference and avoid IRFs with smaller amplitude being submerged. According to the ratio of IFCF to IRF in the demodulated frequency spectrum, the bearing fault location was judged. The effectiveness of the proposed method was verified with the processing results of simulated signals and test ones.

导出引用

刘东东，程卫东，温伟刚. 基于线调频小波路径追踪和逐步解调滤波的滚动轴承故障诊断[J]. 振动与冲击, 2019, 38(11): 88-94

LIU Dongdong, CHENG Weidong, WEN Weigang. Rolling element bearing fault diagnosis based on CPP and stepwise demodulation filtering[J]. Journal of Vibration and Shock, 2019, 38(11): 88-94

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