Mechanical impact type fault diagnosis method based on variable space-scale frame
A variable space, fault diagnosis technology, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve problems such as unfavorable fault characteristics, difficult for technicians to understand, and poor practicability.
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[0159] This embodiment mainly verifies the effectiveness and accuracy of the method of the present invention. The acceleration signal collected by the vibration acceleration sensor from the rolling bearing test bench of the locomotive running part, the rolling bearing model is 552732QT, and its structural parameters are shown in Table 1. The shaft speed is 653r / min, the sampling frequency is 12.8KHz, and the sampling length is 16384. According to the calculation formula of the characteristic frequency of the outer ring of the rolling bearing
[0160] f o =0.5n(1-d / D p cosθ)f r
[0161] The fault characteristic frequency of the outer ring of the tested bearing is 78.52 Hz.
[0162] Table 1 Test rolling bearing parameters
[0163]
[0164] figure 1 It is the vibration signal and frequency spectrum collected on the test bench. Let the control parameter γ be in space
[0165] Γ={(p,q,s)|p,q,s∈Z + ,2≤p≤9,q=p+1,1≤s≤3}
[0166] Take the value in and calculate the global characteristic kur...
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