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파워기반 소음감소 기법을 이용한 준중형 해치백 후석 고주파성 로드노이즈 전달특성 연구
이종현,조세현,이주완,이철현,양정민,Lee, Jonghyun,Cho, Sehyun,Yi, Juwan,Lee, Chulhyun,Yang, Jungmin 한국음향학회 2018 韓國音響學會誌 Vol.37 No.4
세단 타입에 비해 해치백 타입의 차량은 실링구조 확보에 어려움이 있기 때문에 후석에서 느껴지는 차폐성능이 열세한 것으로 알려져 있다. 차량의 차폐감 확보를 위해 강건한 실링 시스템과 충분한 흡음/차음 성능이 요구되지만 준중형 이하 세그먼트에서는 원가, 중량의 제약으로 인해 충분한 흡차음 사양 적용에 제한을 받고있어 효율적인 흡차음 사양의 적용이 요구되고 있는 실정이다. 본 연구에서는 정량적인 측정과 비교, 분석이 가능한 파워기반 소음감소(Power Based Noise Reduction, PBNR) 기반의 차음 윈도우 평가를 통해 준중형 해치백 차량의 후석 소음원의 전달 경로를 분석하고 후석 차폐성능 확보를 위한 흡차음 대안을 제시하였다. It is known that the road noise on the rear seat of a hatchback type car is worse than that of a sedan type car because of the weakness on sealing structure. Therefore, a sound sealing system and sufficient absorption/insulation performance are required. In the case of a compact segment car, however, the application of the sufficient absorption and insulation materials is limited, because of the restriction on the production cost and weight of the car. In this study, we estimate the noise transmission path on the vehicle's body structure from tires and ground using the PBNR (Power Based Noise Reduction) method which is useful in quantitative measurement. Based on these results, we suggest an alternative absorption/insulation method for the better performance of rear seat road noise reduction in a compact hatchback car.
CarMaker를 활용한 운전자 보조시스템의 가상 환경 구축
이종현(JongHyun Yi),김진오(Jinoh Kim),김일환(Ilhwan Kim),서현철(Hyeoncheol Seo),허승진(Seung-Jin Heo) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Collision Avoidance System(CAS) in Advanced Driver Assistance System(ADAS) is an Active Safety System 7 helps the driver to avoid or mitigate rear-end collisions by using forward looking sensors(e.x. Radar, Camera etc.) and brake/steering assist systems(e.x. ESP, EPS etc.). This paper deals with Collision Avoidance System algorithm which is activated when the traffic situation is in very danger. Using driving Situation Assessment algorithm which is composed of many parameters, we classified how dangerous the current driving situation is. If the driver does not react in emergency cases, the Collision Avoidance System generates assisting braking pressure or steering torque automatically in order to avoid a collision. Finally, we present a basic control strategy for the Collision Avoidance System. All simulation environments is constructed by vehicle dynamics simulation program so called IPG CarMaker, and we show convenience and suitability of simulation and evaluation method by using IPG CarMaker in order to analyze and optimize the performance of ADAS and CAS.
지능형 타이어 시스템 활용 노면마찰계수 추정 알고리즘에 관한 연구
김일호(Il-Ho Kim),이종현(JongHyun Yi),허승진(Seung-Jin Heo),김주곤(JooGon Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Vehicle motion is determined by tire forces according to road condition. Therefore, information of tire-road friction is very useful factor to improve stability of chassis control system and Advanced Driver Assistance System(ADAS). This paper indicates current research trends about road friction coefficient estimation and suggests algorithm that can estimate the tire-road friction coefficient during braking and use vehicle’s signals with vertical force from intelligent tire based on deformation sensor, which attached on the tire inner liner. Also, the usefulness of algorithm is verified by vehicle test, which are braking test on wet ABS and dry asphalt road with WFT(Wheel Force Transducer). Finally, the repeatability and reproducibility of suggested tire-road friction coefficient algorithm are validated by vehicle test included RCP(Rapid Control Prototyping) equipment and intelligent tire.
정비범(Beebum Jung),강원율(Wonyul Kang),이종현(Jonghyun Yi),허승진(Seung-Jin Heo) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Brake performance of the vehicle has a great influence on the driver safety and driving characteristics of the vehicle. This study proposes a method to analysis effect analysis of the brake design parameter through the simulation of multi-body dynamic vehicle model. Purpose of effect analysis is to analyze the relationship of brake design parameter and brake distance. The design variables are μ-peak, peak-slip ratio and μ-slide in longitudinal μ-slip curve. Before conducting an effect analysis, a vehicle model based on MBD(Multi-body dynamics) was made through reverse engineering, and it was verified by field test. As the design of experiment for effect analysis, a full factorial design method was used. As a result of conducting an effect analysis of the brake design parameter, it was identified that the μ -peak, peak-slip ratio and μ-slide in longitudinal μ-slip curve have an influence of 91%, 2%, 7% respectively in case of ABS(Anti lock brake system) on. In case of ABS off, it have an influence of 63%, 2% and 35% respectively.
다물체 동역학 기반 차량 모델 시뮬레이션을 통한 쏠림 인자 효과분석
정비범(BeeBum Jung),정관면(Kwan-Myun Jung),이종현(JongHyun Yi),허승진(Seung-Jin Heo) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Steering pull refers to vehicle’s drifting to the lateral direction without a driver’s steering input while on the straight driving. This study proposes a method to analysis effect analysis of the steering pull design parameter through the simulation of multi-body-dynamic vehicle model. Purpose of Effect analysis is to analyze the relationship of steering pull design variables. The design variables are hard point in front, rear suspension and force elements, tire property, road bank angle. Before conducting effect analysis, a vehicle model based on MBD(Multi-Body Dynamics) was made through reverse engineering, and it was verified by field test. As the design of experiment for effect analysis, a Placket-burman method was used. As a result of conducting an effect analysis of the steering pull factors, it was identified that the suspension hard point, bush property, road bank angle, tire and spring have an influence of 43%, 19%, 17%, 12% and 9%, respectively.