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DETECTION OF DISTRIBUTED DEFECTS IN GEAR ASSEMBLIES

  • US 3,712,130 A
  • Filed: 10/30/1970
  • Issued: 01/23/1973
  • Est. Priority Date: 10/30/1970
  • Status: Expired due to Term
First Claim
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1. A system for detecting a distributed defect in one gear of a pair of meshing rotating gears comprising a vibration sensor coupled to the pair of gears for sensing vibrations thereof and converting said vibrations into an electrical signal, means, including a bandpass filter coupled to said vibration sensor, for deriving from said electrical signal a second amplitude modulated signal having a period equal to the meshing period of said gears and a modulation envelope with a period having an integral relation to the period of rotation of said one gear, means for demodulating said second signal and producing a third signal indicative of the magnitude of amplitude modulation, and output means responsive to said third signal for indicating a distributed gear defect.

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