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무용접 경량화 자동차 조향 샤프트의 설계 변수 변화에 따른 구조 해석
이헌균(Heonkyun Lee),김현철(Hyunchul Kim),김충희(Chunghui Kim),나병철(Byungchul Na),허형석(Hyungseok Heo),이봉현(Bonghyun Lee),이기수(Geesoo Lee),배석정(Sukjung Bae),김홍근(Hongkeun Kim) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Steering system is a one of major safe device in vehicle. Universal shaft adopted in steering system transmits steering torque between steering column and steering gear and protect the driver from being damaged by an accident. Conventionally, universal shaft is composed of two components, i.e. shaft and pipe. Two components are connected by a bellows or serration linkage. In this paper, structural analysis is achieved for a serration type non-weld forged universal joint. A simple universal shaft model is proposed to simplify the structural analysis process, the parameter study is performed to evaluate the effect on the structural analysis of the design parameters such as thickness of universal shaft, shape and length of serration.
그린카용 인버터 전력모듈의 열전달 해석 및 평가에 대한 연구
김철수(Chulsoo Kim),이준호(Junho Lee),이기수(Geesoo Lee),이홍섭(Hongseop Lee),김찬중(Chanjung Kim),이봉현(Bonghyun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Since the high-powered power modules for use in motor inverter and DC-DC converter of green cars such as xEVs require the power chips of higher current and thermal density, it is very important to design the power chips considering to its effective thermal dissipation path. Thermal resistance is a key factor in the power module package design for the effective thermal dissipation path from its junction to base plate. Generally the more the thermal resistance decreases, the more the allowable dissipation power and current increase. The thermal resistance of the power module largely depends on the thermal properties of a direct bond copper material. In this paper temperature rise characteristic and thermal resistance are evaluated through the heat transfer analysis on the 2-pack power module for use in inverter of the green car. The experimental measuring method of the thermal resistance referred to the international testing standard is introduced. The heat transfer analysis is conducted about the various direct bond copper materials of the power module package with the commercial code.
커먼레일 시스템의 고압 연료 배관 체결부 축력 예측에 관한 연구
이헌균(Heonkyun Lee),김현철(Hyunchul Kim),허형석(Hyungseok Heo),나병철(Byungchul Na),이봉현(Bonghyun Lee),추성화(Seonghwa Choo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Tube fitting is the one of the basic element in the vehicle. Tube fitting adopted in common rail system is exposed in high pressure above 1,300bar in continuance. Particularly, operating condition of common rail is tending severe, because fuel injection pressure of engine is elevating on demand for vehicle performance improvement. The key point of tube fitting design to prevent the leakage is appropriate assembly torque and axial force. This paper mentions estimation method of axial force in high pressure tube fitting for common rail system and relationship between the torque and axial force. In proportion to tightening nut, the plastic deformation behavior of high pressure tube fitting has analyzed by FEM(finite element method) and axial force has estimated by computation result of reaction force between common rail and tube end.
차량 엔진 회전 차수 측정 기반의 능동 소음 제어에 관한 연구
추용주(YongJu Chu),김규식(Kyusik Kim),이봉현(Bonghyun Lee),신용상(Yongsang Shin),은효준(Hyojun Eun),이승엽(Seung-Yop Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
This research is about the way to control noise of the automobile powertrain actively. In earlier days, the physical ways for minimizing the friction or passive ways such as using vibration absorbers were applied to reduce noise caused by engine speed. However, these ways have had economic and technical limits to be applied at high-performance powertrain. This paper proposed the real-time way that can optionally extract dominant engine noises and eliminate them. The speaker generates wave that has reverse phase of particular noises which the passenger experiences. Then the real-time noise cancelation operates by overlaying the noise and the wave. It was also verified by automobile-running tests.