Abnormal noise detector for use in the inspection of gear units

Details Abnormal noise detector for use in the inspection of gear units Abnormal noise detector for use in the inspection of gear units

1984-03-27

1985-11-05

Birmiel, Howard A.

Measuring and testing

Vibration

By mechanical waves

73593, 73659, 73660, G01N 2900

Patent

active

045506035

ABSTRACT:
An abnormal noise detector for detecting abnormal noises resulting from a marred tooth surface in a gear of a gear unit is disclosed. A first embodiment of a detector comprises a microphone placed in the vicinity of a gear unit to be tested, a bandpass filter for filtering the output of the microphone so as to pass only an integral multiple of the fundamental frequency of noise due to meshing of the gears of the gear unit, a rectifier for rectifying the filtered output from the bandpass filter, a differentiator for differentiating with respect to time the DC output from the rectifier, a waveform shaper for shaping the output from the differentiator into pulses suitable for counting, and a pulse counter for quantifying the pulses in the output from the waveform shaper. A second embodiment comprises a microphone, a digital frequency analyzer, and a data monitoring computer responsive to the digital frequency analyzer for monitoring the output thereof.

REFERENCES:
patent: 1644876 (1927-10-01), Domizi
patent: 2340714 (1944-02-01), Traver et al.
patent: 3699806 (1972-10-01), Weichbrodt
patent: 4352293 (1982-10-01), Kurihara et al.
patent: 4429578 (1984-02-01), Darrel et al.
patent: 4437163 (1984-03-01), Kurihara et al.
patent: 4488240 (1984-12-01), Kapadia et al.
patent: 4514797 (1985-04-01), Begin

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