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二次型时频分布可以从时域特征与频域特征的结合途径揭示了信号的构成本质。通过巧妙构思核函数,可以获得一种新的时频分布。实例表明该分布具有良好的时频聚集性,能够有效地实现信噪分离,从强大的谐频信号中清晰地分辨出较弱的周期性冲击信号,为机械故障诊断提供了有力的工具。
The quadratic time-frequency distribution can reveal the nature of the signal from the combination of time-domain and frequency-domain features. By clever idea of the kernel function, a new time-frequency distribution can be obtained. The example shows that the distribution has a good time-frequency aggregation, can effectively separate the signal and noise, and clearly distinguish the weaker periodic impact signal from the strong harmonic signal, which provides a powerful tool for mechanical fault diagnosis.