基于自动搜峰瞬时频率估计的自适应多阶比分析技术研究

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振动与冲击 ›› 2015, Vol. 34 ›› Issue (18) : 19-24.

论文

王栋丁雪娟

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Tacholess Adaptive Multi-order Tracking technology Based on Instantaneous Frequency Estimation with Automatic Peak Search Algorithm and Its Application

Wang Dong Ding Xuejuan

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文章历史 +

摘要

提出一种利用自动搜峰的瞬时频率估计技术来实现旋转机械自适应多阶比分析(Adaptive multiple order tracking, AMOT)的新方法。首先，通过时频分析得到振动信号的时频分布，根据频率峰值坐标自动选取搜峰起始点，自适应搜索出不同阶比分量的时频峰值。其次，利用最小二乘法将不同频率分量进行拟合实现瞬时频率估计，然后根据参考分量计算出重采样的鉴相时标对原始信号进行重采样，最后通过FFT变换实现阶比分析。该方法通过瞬时频率估计能够自动识别出所有阶比分量，实现优中选优，避免了传统算法中人为直观选取一个分量进行遮掩滤波提取分量的方法，减少了人为选取分量及起始点造成的误差，具有自适应性。并且无需同步采集转速信号，大大简化了应用条件，同时减少了人为因素，提高了分析精度，为旋转机械故障诊断提供了新方法。仿真实验和应用实例验证了方法的有效性。

Abstract

A new method of adaptive multiple order tracking (AMOT) in rotating machinery is proposed based on instantaneous frequency estimation with adaptive peak search algorithm. Firstly, the time-frequency distribution is obtained by time-frequency analysis method. According to the frequency peak coordinate, the starting point of peak search is selected automatically and time-frequency peaks of different orders are searched adaptively. Secondly, the different frequency components are fitted to achieve instantaneous frequency estimation by using the least square polynomial, and then the resample time is calculated according to the reference component to resample the original signal. Finally multi-order tracking spectrums are obtained by FFT transform. By the method of instantaneous frequency estimation, the proposed method can automatically identify all-order components and choose the best one, avoiding the human error of traditional algorithm to choose reference component and starting point subjectively. The method can identify the components of different order without synchronization speed signal, and greatly simplify the application conditions and improve the accuracy of analysis. It provides a new method for fault diagnosis of rotating machinery. The method is proved to be effective by simulation example and practical application.

导出引用

王栋丁雪娟. 基于自动搜峰瞬时频率估计的自适应多阶比分析技术研究[J]. 振动与冲击, 2015, 34(18): 19-24

Wang Dong Ding Xuejuan. Tacholess Adaptive Multi-order Tracking technology Based on Instantaneous Frequency Estimation with Automatic Peak Search Algorithm and Its Application[J]. Journal of Vibration and Shock, 2015, 34(18): 19-24

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