Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Analysis of the PTO Driveline Rattle Noise on an Agricultural Tractor

농업용 트랙터 PTO 전동라인의 래틀 소음 분석

  • Ahn, Da-Vin (Department of Biosystems and Biomaterials Science and Engineering, Seoul National University) ;
  • Shin, In-Kyung (Daedong Industrial Co., Ltd, R&D Center) ;
  • Han, Hyun-Woo (Department of Biosystems and Biomaterials Science and Engineering, Seoul National University) ;
  • Son, Gwan-Hee (Department of Biosystems and Biomaterials Science and Engineering, Seoul National University) ;
  • Park, Young-Jun (Department of Biosystems and Biomaterials Science and Engineering, Seoul National University)
  • 안다빈 (서울대학교 바이오시스템.소재학부) ;
  • 신인경 (대동공업 기술연구소) ;
  • 한현우 (서울대학교 바이오시스템.소재학부) ;
  • 손관희 (서울대학교 바이오시스템.소재학부) ;
  • 박영준 (서울대학교 바이오시스템.소재학부)
  • Received : 2019.04.23
  • Accepted : 2019.05.05
  • Published : 2019.06.30
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Abstract

In this study, we analyze the rattle noise of a power takeoff (PTO) driveline and develop a PTO driveline resonance model. We measured the rattle noise of the PTO driveline on the output shaft and, by analyzing the rattle noise in the time domain, we determine that the engine expansion stroke period matches the sound pressure of rattle noise. This finding helped us demonstrate that the rattle noise is caused by the collision between the PTO driving gear and the gear driven by the engine expansion stroke; the torsional vibration caused by this collision is affected by the angular velocity fluctuation of the PTO drive shaft. By measuring the angular velocity of the PTO drive shaft, we confirm that the angular velocity fluctuation of the engine flywheel tends to excessively amplify the PTO drive shaft angular velocity fluctuation. We conclude that the resonance, which occurs when the operating frequency of the engine is close to the natural frequency of the tractor power transmission system, causes the excessive angular velocity fluctuation of the PTO drive shaft. We performed a modal analysis of the PTO driveline resonance and, using the characteristic equation, we show that the resonance occurs when the engine rotation speed is close to 850 rpm, which matches the natural frequency of the PTO driveline.

Keywords

References

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