摘要针对基于时频分析的瞬时转频估计问题及现有方法在抗噪性和估计精度方面的不足，引入一种新兴的强抗噪性的时频分析方法——时频聚集（concentration of frequency and time，ConceFT），提出ConceFT联合峰值搜索的瞬时转频估计方法。仿真实验中，测试了不同信噪比下的线调频信号和正弦调频信号的瞬时转频估计，结果表明该方法能够有效抑制强噪声干扰，准确估计瞬时转频，在信噪比大于-20dB时能保证估计误差在3%以内。该方法分别用于转速上升和转速复杂波动的滚动轴承振动信号分析，均能以高精度提取出瞬时转频曲线。与经典的短时傅里叶联合峰值搜索方法对比，在抗噪性及估计精度上均有显著提高。
Abstract：Aiming at existing methods of rolling bearings’instantaneous rotating frequency estimation based on time-frequency analysis having some problems in anti-noise property and estimation accuracy,a new time-frequency analysis method-concentration of frequency and time(ConceFT) with strong anti-noise property was introduced, the ConceFT joint peak search method was proposed to estimate rolling bearings’ instantaneous rotating frequency. In simulation tests, line frequency modulation signals and sinusoidal frequency modulation ones under different signal-to-noise ratios (SNR)were tested to estimate their instantaneous rotating frequency.Results showed that the proposed method can effectively suppress strong noise interference, and correctly estimate instantaneous rotating frequency;it can guarantee the estimation error to be within 3% when SNR is larger than -20 dB;it can be used to analyze vibration signals of rolling bearings with lifting rotating speed or fluctuating one, and can extract their instantaneous rotating frequency curve with a high precision;compared with the classical short-time Fourier joint peak search method,the proposed method is improved significantly in anti-noise property and estimation accuracy.
马增强，阮婉莹，陈明义. ConceFT在滚动轴承瞬时转频估计中的应用[J]. 振动与冲击, 2019, 38(19): 131-138.
MA Zengqiang, RUAN Wanying, CHEN Mingyi. Application of ConceFT in instantaneous rotating frequency estimation of rolling bearings. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(19): 131-138.
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