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승용차의 56kph 정면 충돌 시 차체 감속도 Pulse 개선 연구
배현우(Hyunwoo Bai),홍철기(Chulkee Hong),임종현,김동석(Dongseok Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Since 1999 Korea NCAP(New Car Assessment Program) has been crash testing vehicles and publishing results to provide new vehicle consumers, when making a purchasing decision, independent advise on occupant protection. During the life of the NCAP program there have been significant improvements in the occupant safety performance of vehicles. In Korea NCAP 56kph crash test the deceleration pulse is very important factor for occupant safely. Firstly an analysis of crash test data of small proto type vehicle, known changes to vehicle specification, is undertaken to review the effect in deceleration pulse. And in this study we will consider about influence of engine, transmission and structural strength.
유럽과 북미 RCAR 대응을 위한 Bumper system 최적설계
안인지(Inji Ahn),배현우(Hyunwoo Bai),이만수(Man-Su Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The RCAR has been estimating the damageability and reparability of motor vehicle to calculate insurance rate. For this, the override/underride tests and 40% offset 10dgree rigid wall test are performed to simulate real crash collision. Because customers can pay lower insurance in accordance with results of tests, car manufacturers need to develop efficient bumper system that can protect the vehicle from damage in low speed crash. In this paper, we have conducted case study using FEM analysis method and present improved design concept for RCAR.
RCAR bumper Over/Under-ride 규정 및 해석을 통한 성능개선 연구사례
이성욱(Sungwook Lee),배현우(Hyunwoo Bai),임종현(Jonghyun Yim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Performing traditional RCAR structural test, some car manufacturers have fitted with countermeasures that do not exhibit good crash behavior in real world accidents. In some cases, manufacturers have eliminated bumper beams and replaced them instead with small and strong cones to manage the test. Such designs are not robust and can lead to expensive damage in car-to-car accidents. So, RCAR published a new bumper test (Over/Under-ride) procedure to reflect real world accidents and to encourage manufacturers to design vehicles with robust bumper systems. This paper presents the RCAR Under/Over-ride test procedures and the factor for a robust bumper system to pass the test by FEM case study of bumper beam section.
스티어링 휠 진동 개선을 위한 IP Structure 최적화 방법론 연구
서윤미(Yunmi Seo),배현우(Hyunwoo Bai),이상윤(Sangyun Lee),김용석(Yongsuk Kim) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
현재 자동차 업계에서는 감성품질이 중요시 됨에 따라 차량의 정숙성, 진동 등 고객들의 요구수준이 높아지고 있다. 특히 스티어링 휠은 운전자와 매우 밀접한 파트로, 스티어링 휠로 전달되는 진동은 감성품질을 떨어뜨리는 주요 원인이 된다. 본 논문에서는 스티어링 휠 진동량을 저감시킬 수 있는 IP Structure 최적설계 방법론을 제시했다. 먼저 효과적인 Loadpath를 찾고자 IP Structure와 바디의 연결 부위들을 설계공간으로 설정해 위상 최적화를 진행했으며, Cross Car Beam (CCB)의 섹션에 대해서 형상 최적화를 진행했다. 본 연구에서 제시한 방법으로 3기통 엔진의 스티어링 휠 A/T성능을 개선시키는 IP Structure 최적 설계안을 도출했으며, 스티어링 휠 진동이 개선됨을 검증했다.
보행자보호를 위한 Fender mounting bracket 형상 최적화
주영준(Youngjun Joo),배현우(Hyunwoo Bai),이만수(Mansu Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently EURO-NCAP which is the organization assess the safety of crashworthiness of the vehicle enforces the pedestrian protection test protocol, and globally many countries are going to legislate some protocols for the purpose of the pedestrian protection as following the GTR(Global Technical Regulation). HIC(Head Injury Criteria) is one of the assessment measures in the pedestrian protection test which is calculated from the acceleration value when the human head-form is impacted to the vehicle’s hood or windscreen and is effected by the vehicle structure, material, and thickness etc. Most of the vehicle shows high HIC value in the area of between hood and fender due to the fender mounting bracket. By changing the Fender mounting bracket design the HIC value can be improved.
유봉준(Bongjun Yoo),배현우(Hyunwoo Bai) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Under free vibration, the system oscillates at its natural frequencies which are dynamic characteristics of the structure specified by its stiffness and inertia properties. Modal analysis provides useful insight into the dynamic behavior of a structure. The vehicles are composed of many components which has their own natural frequencies. In case that the vehicle global mode is very close to a component’s mode in frequency, these 2 modes would be coupled and could cause a problem of noise and vibration. Especially when the component has considerable mass comparing to the total mass, the component mode can shift the vehicle global mode up or down. For this reason, we need to identify the vehicle global mode and the component modes and track their changes in the system. In this study, the component mode identification procedure is introduced. The battery system in the electric vehicle can be an example for this subject since the battery system is a large component which can influence the significant mode in the entire structure. This study shows the battery system’s mode which is identified and decoupled from the vehicle global mode to improve its performance.
Twist Axle 서스펜션을 고려한 저주파 브레이크 노이즈 해석
조준수(Joonsoo Cho),배현우(Hyunwoo Bai),김민석(Minsock Kim) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Brake moan noise has been mostly problematic with rear chassis subsystems. The moan phenomenon exhibits itself as a low frequency chassis vibration accompanied with uncomfortable noise level both inside and outside the vehicle compartment. Brake moan noise analysis has been established by self-excited friction model based on instability vibration theory. The instability chart is obtained as a result of comprehensive investigation employing twist axle type rear chassis subsystem. The objective of this paper is to investigate mechanism of generating brake moan noise in twist axle type rear chassis subsystem. The dominant suspension parameter considering reducing brake moan noise is presented with respect of verification involving durability cycles and roll steer on twist axle type rear chassis subsystem.