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Seat 모듈 내구성 평가를 위한 가속 진동 내구 시험 방법 개발
고웅희(WoongHee Ko),최성진(SungJin Choi),황범진(BumJin Hwang),백홍전(Hongjeon Baek) 한국자동차공학회 2011 한국자동차공학회 지부 학술대회 논문집 Vol.2011 No.5
Recently it is very highlighted to reduce the energy and fuel consumption of vehicle. Al and Mg material is preferred to reduce weight for fuel efficiency improvement to steel material for body, chassis, seat module, etc. In this paper we developed accelerated vibration fatigue test method and reproduction vibration test method on proving ground in order to durability evaluation of seat module. We tested the made by steel and Mg seat by vibration tester. Fatigue damage spectrum is made by real vehicle test data of general roads and of proving ground to consider operation profile of target PSD. It is proved to be useful to test seat module and is possible to reduce the time and costs.
잔류응력을 고려한 Lower Control Arm의 내구해석
최보원(Bowon Choi),강우종(Woojong Kang),고웅희(Woonghee Ko),김기훈(Gihoon Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
Fatigue life prediction of a lower control arm is carried out with finite element methods. The lower control arm has heat effected zone induced from a seam welding process. The residual stresses generated in the zone are measured by a x-ray stress analyzing equipment. Since the residual stress has much effects on the fatigue life, the residual stress is considered in the fatigue life prediction process as mean stresses with relaxation effect. The heat transfer and a thermal elasto-plastic analyses are performed and verified with measured residual stress value. The fatigue life predicted by simulations are compared with test results.
박은지(Eunji Park),남찬혁(Chanhyuk Nam),고웅희(Woonghee Ko),함규용(Gyuyong Ham),김성훈(Sunghoon Kim),최성욱(Sungwook Choi),이기주(Kiju Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
With the strengthening of international environmental regulations, fuel economy regulations, and rising prices of energy resources, the development of lightweight materials and components for automobiles to improve fuel efficiency is being actively conducted. Compared to passenger cars, commercial vehicles that have a large load and long-distance operation are also developing technologies related to weight reduction to improve fuel efficiency. There is a growing interest in brake products, which are highly lightweight. Currently, the brake system of a medium-large commercial vehicle is shifting from a drum brake to a disc brake system that can provide braking safety and light weight. In the advanced automotive market in Europe, mass production of lightweight products using technologies such as aluminum hubs and dissimilar materials is being developed through new material application and optimal design technology. However, as the brake is a part directly connected to the safety of the vehicle, securing safety is an important factor in product development. In this paper, a model of a commercial vehicle wheel hub module consisting of three parts is presented for light weight, and the structural stability of the proposed lightweight wheel hub module is evaluated through analysis. In addition, the strain generated by the strain gauge was measured using a commercial brake dynamometer. The accuracy of the analytical model was improved through comparison with the analytical model.
EV 2단 변속 구동 시스템 신뢰성 평가 기술 개발에 관한 연구
홍은희(Eunhee Hong),김대성(Deasung Kim),고웅희(Woonghee Ko),박영운(YoungWoon Park) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
최근 국내외 선진 완성차 업체에서 본격적으로 전기차 라인업을 확대할 계획을 발표하면서 전기차량의 구동시스템 성능 및 효율 향상 기술 개발이 활발히 진행되고 있다. 전기차 구동 모터는 전기를 이용하여 구동력을 발생하는 전장품으로 모터 축에 감속기를 연결하여 적절한 토크를 바퀴에 전달하여 차량을 구동시키는 부품이다. 본 연구에서 개발하고자 하는 2단 변속기는 전기적으로 구동되는 구동모터의 동력을 고회전의 변속비 및 저회전의 변속비로 변환하여 출력시키도록 구성된 전기자동차의 자동변속기이며 주행환경에 맞게 수동 변속 모드를 선택할 수 있도록 함과 주행 중 주행속도에 따라 자동으로 변속할 수 있는 자동 변속 모드를 부여함으로써 연비 향상 및 안정적 주행이 가능하도록 하는 것이다. 이에 개발 완료된 시제품을 장착하여 운전자의 사용조건에 부합되는 내구신뢰성을 갖도록 실제 주행 도로의 수십 내지 수백 배의 가혹도를 갖는 내구시험모드 개발을 통해 내구시험을 단축시키는 것은 초기 시장 진입 기간을 단축하여 시장 경쟁력을 강화하는데 중요한 요소로 작용하게 된다. 본 연구는 전기차용 2단변속기 시스템을 개발하는 것을 목표로 유사차량의 실도로 주행환경 데이터(Road Load Data Acquisition)를 측정 하여 차세대 전기차종의 2단 변속기 부품의 최종 성능 평가 항목 및 목표 하중을 도출하고 내구 신뢰성 평가법을 개발하였다.
SUV 차량용 능동 롤 제어 알고리즘 개발 및 실차 성능 평가
전광기(Kwangki Jeon),황현수(Hyun-Soo Hwang),고웅희(Woonghee Ko),최성진(Sungjin Choi),김준태(Joontae Kim),장기원(Kiwon Jang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Cornering maneuvers with reduced body roll and without loss in comfort are heading requirements of car manufacturers. ARC system can control body roll angle by using motor actuators installed in the center of front and rear stabilizer bars. The full vehicle analysis model developed using a CarSim S/W has been validated using vehicle test data. The ARC controller has been designed using an estimated lateral acceleration and target roll angle map data. Co-simulations with the Matlab simulink controller model and the CarSim vehicle model have been conducted to evaluate the performance of the ARC control algorithm. In order to evaluate the ARC performance in a real vehicle, vehicle tests have been conducted in a KATECH proving ground using the small SUV installed two ARC actuators, controller and a few subsystems. From the simulation and vehicle test results, it is shown that the proposed ARC control algorithm and the developed ARC system can improve vehicle comfort.