Integrity test for acoustic bearing defect detector
First Claim
1. In an apparatus for monitoring bearings of a railway train for defects during operation of the train along a section of track said apparatus being of the type including train speed sensing means, means for transducing acoustic vibrations in said bearings into an electric signal, means for filtering the electric signal, and means for spectrum analyzing the electric signal, the improvement comprising means for automatically generating successive simulated characteristic acoustic signatures of various gearing defect types/bearing size/wheel diameter/train speed combinations and means for detecting expected alarm signals from said spectrum analyzing means in response to said simulated characteristic acoustic signatures.
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Abstract
This invention relates to the testing of apparatus used for on-line acoustic detection of bearing defects, particularly in railroad applications. A loudspeaker on each side of the section of track, in response to a microprocessor, generates simulated acoustic signatures characteristics of various bearing defects. The microprocessor additionally sends corresponding simulated train speed signals to the apparatus. The invention monitors the apparatus for the appropriate alarm signal.
23 Citations
17 Claims
- 1. In an apparatus for monitoring bearings of a railway train for defects during operation of the train along a section of track said apparatus being of the type including train speed sensing means, means for transducing acoustic vibrations in said bearings into an electric signal, means for filtering the electric signal, and means for spectrum analyzing the electric signal, the improvement comprising means for automatically generating successive simulated characteristic acoustic signatures of various gearing defect types/bearing size/wheel diameter/train speed combinations and means for detecting expected alarm signals from said spectrum analyzing means in response to said simulated characteristic acoustic signatures.
Specification