Journal of Biosystems Engineering

Korean Society for Agricultural Machinery (한국농업기계학회)
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Analysis and Reduction Method of Noise from Head of a Combine Harvester

콤바인 전처리부의 소음 분석과 감소 방안

  • Kim, Ho-Jung (Dept. of Biosystems and Biomaterials Science and Engineering, Seoul National University) ;
  • Park, Young-Joon (Korea Institute of Machinery & Materials) ;
  • Shim, Sung-Bo (Dept. of Biosystems and Biomaterials Science and Engineering, Seoul National University) ;
  • Kim, Kyeong-Uk (Dept. of Biosystems and Biomaterials Science and Engineering, Seoul National University)
  • Published : 2007.06.25
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Abstract

This study was conducted to measure and analyze the noise from a combine head. The combine head, comprised of a cutting knife assembly, pick-up chains, horizontally conveying chains and vertically conveying chains, had an overall sound level of 101 dBA. The sound levels of each component were, respectively, 98.3 dBA for the cutting knife assembly, 88.9 dBA for the pick-up chains, 79.8 dBA for the horizontally conveying chains and 86.3 dBA for the vertically conveying chains, being equivalent to 54.4%, 18.4%, 6.5% and 13.7% of the overall head noise. The main cause of the head noise was considered the impacts that the joint of the cutting knife assembly made with frame when it oscillated. The impact sound was also generated when the chain lug collided with the chain case. To reduce these impact sound, anti-vibration rubbers were installed on the knife assembly joint and the chain cases. It reduced the head noise by 4 dBA but the overall noise level of the combine head was still high. In order to protect the combine operators more effectively from the noise, a safety cab needs to be installed on the combine.

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References

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