Doppler distorted acoustic signal correction method based on microphone array
A microphone array and acoustic signal technology, which is applied in the field of fault diagnosis and acoustic fault diagnosis of rail-side train bearings, can solve the problems of reduced practicability, long calculation time, large calculation amount, etc. small amount of effect
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[0039] Example 1:
[0040] Process the fault signal of the bearing outer ring with Doppler distortion. The signal is collected by a linear array of equidistant microphones, the distance between the array elements is 0.1m, and the number of elements is 4. The vertical distance between the microphone array and the sound source is 2m, and the sound velocity is 340m / s. The bearing model with outer ring failure is NJ(P)3226X1, and the parameters are shown in Table 1.
[0041] Table 1: Train bearing NJ(P)3226X1 specification parameters (unit: mm)
[0042]
[0043] The signal sampling rate is 25.6kHz, and the speed is 576r / min. At this speed, the failure frequency of the bearing outer ring is f o = 55.9 Hz.
[0044] image 3 (a) and image 3 (b) are the spectrum and envelope spectrum of the collected signal respectively. Due to the existence of Doppler distortion, the signal spectrum and envelope spectrum frequency have both been broadened and shifted, which makes it impossible to diagno...
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[0051] Example 2:
[0052] The fault signal of the inner ring of the bearing with Doppler distortion is processed. As in the first embodiment, the signal is collected by an equidistant microphone linear array, the distance between the array elements is 0.1m, and the number of array elements is 4. The vertical distance between the microphone array and the sound source is 2m, and the sound velocity is 340m / s. The bearing model with outer ring failure is NJ(P)3226X1, and the parameters are shown in Table 1. The signal sampling rate is 25.6kHz, and the speed is 576r / min. At this speed, the fault frequency of the bearing inner ring is f i = 78.5 Hz.
[0053] Figure 5 (a) and Figure 5 (b) are the spectrum and envelope spectrum of the collected signal respectively. Due to the existence of Doppler distortion, the signal spectrum and envelope spectrum frequency have both been broadened and shifted, which makes it impossible to diagnose bearing faults. Using the method for correcting ...
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