United States Department of Transportation
i
Experimental Results of RAWCAD Static Test
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2020-05-01
[PDF-625.63 KB]
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Edition:Research Results
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Abstract:From September 7, 2018, to December 16, 2019, the Federal Railroad Administration supported the performance of semi static tests on two cracked axles as part of the Resonant Acoustic Wayside Automated Cracked Axle Detection (RAWCAD) project. The performance of detection algorithms for distinguishing frequency shift in cracked axles was evaluated at the Transportation Technology Center (TTC) in Pueblo, CO. Two cracked axles were tested, one on each of the two railcars. The remaining axles on both cars were unblemished. Originally, locations of the cracked axles were unknown to the analyst, making this initial evaluation a blind test of the detection algorithm. This test procedure called for impacting each axle with a hammer and measuring the response with an accelerometer attached to the axle. This impact/measure sequence was repeated as the railcar was indexed forward an incremental distance. Since the crack breathing phenomenon causes a crack to open and close once per revolution, the measured frequency response for the cracked axle should vary as the railcar is moved through one complete wheel revolution. Alternatively, there should be no shift in the frequency response for uncracked axles.
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