An Experimental Study on the Characteristic of Bearings with a Defect using the Sound-Intensity Technique

음향 인텐시티를 이용한 결함이 있는 베어링의 특성에 관한 실험적 연구

  • 이해철 (명지대학교 대학원 기계공학과) ;
  • 김명균 (명지대학교 대학원 기계공학과) ;
  • 안기순 (인덕대학 기계과) ;
  • 차경옥 (명지대학교 기계공학과)
  • Published : 1999.05.01

Abstract

The two-microphone sound-intensity technique has been used for the detection of defects in radially loaded ball bearings. The difference in the sound-intensity levels measured for bearings with no defect and for those with intentionally introduced defects of different sizes in their elements under various operating conditions of loads and speeds is demonstrated. A change in the intensity frequency spectrum because of the defects is observed. The results show that the detectability of an outer-race defect is much better than that of on inner-race or ball defect. It is difficult to detect defects at lower speeds. Sound-pressure measurements were also performed fur comparison, and it is shown that the detectability of defects by sound-intensity measurements is better than that by sound-pressure measurements.

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