Method and apparatus for detecting gear defects

Details Method and apparatus for detecting gear defects Method and apparatus for detecting gear defects

1988-03-21

1990-06-05

Lall, Parshotam S.

Boots, shoes, and leggings

364508, 36447417, 73593, 73607, 73162, 73660, 340683, G06F 1520, G01M 700, G01M 1300

Patent

active

049319493

ABSTRACT:
A gear defect analyzing system records the interaction of each tooth of a gear system until the interaction begins to repeat and then processes the information in such a way as to identify defective gear tooth. Signals from a gear box are detected by an accelerometer and a shaft encoder and fed to an interface circuit and then to an analog signal preprocessing circuit. The preprocessing circuit conditions the signal so that it can be analyzed by a microcomputer. The system has the capability of identifying the class of incoming signals, determining the optimal time domain average, eliminating unwanted spectral components and interference, computing specific measurements relating to gear wear and then performing analysis of time history within a given system operating state to determine which gears and gear teeth are defective. By recording each tooth-to-tooth interaction over a period of time, and then processing the recorded matrix of data, it is possible to locate individual tooth defects. The system is also capable of detecting, classifying, and analyzing other types of hard-to-find defects.

REFERENCES:
patent: 2965971 (1960-12-01), Pomernacki
patent: 4237454 (1980-12-01), Meyer
patent: 4252023 (1981-02-01), Pomernacki
patent: 4707688 (1987-11-01), Thomas
patent: 4730484 (1988-03-01), Olschefski
patent: 4758964 (1988-07-01), Bittner et al.
McFadden; "Low Frequency Vibration Generated by Gear Tooth Impacts"; NDT International, vol. 18, No. 5; Oct. 1985.

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