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엔진 Cover류 방사 소음 해석 기술 개발 및 구조적 개선 설계안 도출
이철훈(Chulhoon Lee),김광수(Kwangsoo Kim),오종민(Jongmin Oh),임규운(Gyuun Im) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Recently, exhaust regulations have intensified due to the global warming and air pollution problems. For this reason, the research is being done competitively to develop a higher specific power engine and fuel efficiency engine by weight reduction and engine down-sizing. Although these weight reduction and high power engine development trend is a disadvantage for a NVH performance of the engine, NVH characteristic may be an important performance index to ensure the competitiveness of the product with an increase of customer demand for the noise and vibration performance. These days, CAE analysis technique has been developed actively to predict the NVH performance in the early stage of product development and our company also is studying to predict NVH performance of the engine by using CAE analysis technology by continuously. In this paper, the analysis process for the structural borne noise of the engine covers is developed as one of the NVH analysis and analytical DB is built by performing an assessment of the production model. Also, noise performance of the engine TGC Cover is evaluated by using the analysis process, and structural improved design is recommended based on the analysis results in the development stage.
굴삭기 선회 디바이스 기어의 Case Crushing 강도 평가 기술 개발 및 설계 최적화
이철훈(Chulhoon Lee),성두현(Doohyun Sung),김광수(Kwangsoo Kim),김경근(Kyeongkeun Kim),임규운(Gyuun Im),박흥근(Heungkeun Park) 한국자동차공학회 2018 한국자동차공학회 부문종합 학술대회 Vol.2018 No.6
Case Crushing failure mode may occur in hardened gears that are subjected to large torque, such as excavator swing device pinions and swing bearing gears. In Case Crushing failure mode, the crack is generated at case core boundary in hardened gears, unlike pitting or bending fatigue which is general gear failure modes. In this paper, the Case Crushing strength analysis methodology was developed and design optimization was performed to improve Case Crushing strength for large size excavator swing bearing gear. For more accurate result, the swing device system was modeled with considering the influence of pinion shaft deformation, roller bearing stiffness, and gear lead slope that is one of the micro geometry. The gear lead slope was optimized by using developed detail analysis model under various swing torque condition.