• 한국자동차공학회논문집
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• 제16권5호
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• pp.140-146
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• 2008

A friction damper is installed in the passenger car driveline in order to dissipate the torsional vibration energy. The frictional damping hysteresis has considerable influences on the driveline vibration characteristics and, therefore, it is one of the most important parameters in the damper design. To investigate the hysteresis effects on the driveline vibration, a dynamic model of the passenger car driveline with manual transmission has developed, and simulations were executed on the several different driving conditions for various hysteresis values. To verify the model, vehicle tests are preformed and the test data were compared with the simulations results. The simulation and test results show good agreements and the model could be used to determine the optimal hyteresis values in early design stage of the damper.

• 한국소음진동공학회논문집
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• 제13권6호
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• pp.445-451
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• 2003

Booming sound is one of the most important interior sound of a passenger car. The conventional booming noise research was focused on the reduction of the A-weighted sound pressure level. However A-weighted sound pressure level cannot give the whole story about the booming sound of a passenger car. In this paper, we employed sound metrics, which are the subjective parameters, used in psycoacoustics. According to recent research results. the relation between sound metrics and subjective evaluation is very complex and has nonlinear characteristics. In order to estimate this nonlinear relationship, artificial neural network theory has been applied to derivation of sound quality index for booming sound of a passenger car.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2005년도 추계학술대회논문집
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• pp.838-843
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• 2005

The nonlinear characteristics of a suspension is directly related to the ride quality of a passenger car. In this study, a dynamic experiment for a spring and a damper of a passenger car is performed to analyze the nonlinear characteristics using MTS 1-axial testing machine and a mathematical nonlinear dynamic suspension model based on experimental data is devised to estimate the ride quality using Billings' method. The devised nonlinear model is applied to the ride quality analysis using K factor and the effect of suspension parameters is examined. As a result, the friction between the cylinder and the piston of a damper is the most effective parameter for the ride quality of a passenger car.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 춘계학술대회 논문집
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• pp.58-63
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• 2005

It is an emergency which is in the process of existing using of passenger compartment equipment of the rolling stock to sprout and interphone wiring and by the fire sensor which perceives the smoke in the use passenger car ceiling the receiver which is to driver's cabin it leads and the fire occurrence alarm voice sprouts carried on shoulder but, by no. of the car indication ramp it divides the corresponding vehicle and from inside the passenger compartment of the rolling stock from fire occurrence hour driver's cabin corresponding passenger no. of the car. It is accurate and in order it will be able to perceive. It will be able to confront initially quickly with the technique which it composes. It is regarding the fire safety surveillance system it will be able to embody at the expense which is cheap in order to use existing wiring.

• 한국자동차공학회논문집
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• 제17권5호
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• pp.133-139
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• 2009

When two cars impact each other, it is usually known smaller vehicle's passenger likely to be more seriously injured than bigger one's. Generally it is known that SUVs and Light Truck Vehicles (LTVs) are bigger and heavier than passenger vehicles and their drive height such as bumper rail and side member, and front end stiffness are higher than those of passenger vehicles. Because of these characteristics the occupants of passenger vehicle struck by SUVs or LTVs are more likely to experience severe injury or fatal injury. To evaluate SUV and LTV's aggressivity to passenger vehicle, SUV to passenger vehicle and LTV to passenger vehicle head-on crash test have been carried out. And finally the way how to reduce incompatibility between SUV and LTV and passenger vehicles is suggested.

• 디자인학연구
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• 16호
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• pp.53-63
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• 1996

고도의 경제성장과 더불어 우리들의 생활이 윤택해지면서 과거 부(富)의 상징으로 느껴졌었던 자동차가 지금은 우리들에게 없어서는 안될 생활필수품으로 자리잡게 되었다. 이러한 시대적 변화는 MY-CAR시대를 맞이하게 되었고, 그 수요는 폭발적으로 증가하고 있는 실정이다. 그렇지만 이러한 추세에 비하여 우리의 자동차 개발 기술 수준은 선진국들 처럼 질(質)과 양의 측면에서 균형을 이루지 못하고 있어 아직도 개인의 기호를 만족시키기에는 역부족임을 실감케 하고 있다. 본 연구에서는 자동차 개발기술과 품질의 균형 있는 발전을 꾀하기 위하여 현재까지 관심사가 적었던 자체 색 분야를 죽 연구대상으로 하여 주거의 연장으로서 필요한 상황과 최근 한국 승용차의 색상경향, 시대적 환경 요인들을 조사, 분석하고 색상개발 시 제한될 수 있는 여러 가지 문제점을 파악하여 현대인의 기호에 맞는 승용차 색상개발 시에 참고 자료로 제시하여 보다 체계적이고 효과적인 차체 색을 개발하는데 도움이 될 것으로 충분히 예상된다.

• 대한교통학회지
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• 제35권2호
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• pp.105-115
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• 2017

지난 10년간 대한민국에서 발생한 전체 교통사고 수는 감소했지만, 사업용 차량의 교통사고는 꾸준히 증가하는 추세를 보이고 있다. 특히, 연중 많은 관광객이 방문하고 렌터카를 주 교통 수단으로 이용하는 제주도의 경우 렌터카 사고 문제로 심각한 인명 피해와 사회적 비용이 야기되고 있다. 이에 본 연구는 제주지역에서 발생한 렌터카 사고의 특성을 비사업용 일반승용차 사고 특성과 비교 분석하였고, 사고 감소 방안을 제시하였다. 본 연구에서는 지난 2년간(2014-2015년) 제주지역에서 발생한 918건의 렌터카 사고와 4,201건의 일반승용차 사고 데이터를 카이제곱검정 및 z-검정 등의 통계적 방법론을 활용하여 분석하였다. 분석결과 렌터카 사고와 일반승용차 사고의 특성은 상이한 것으로 나타났다. 렌터카 사고는 20-30대 젊은 운전자와 면허를 취득한지 얼마 되지 않은 운전자 비율이 높은 것으로 나타났으며, 인적 및 환경적 요인에 관련된 사고특성이 일반승용차와 유의한 수준 하에서 통계적으로 다르게 나타났다. 특히 운전 미숙, 낯선 지리, 익숙하지 않은 차량 등은 렌터카 사고를 유발하는 주요 원인으로 판단된다. 반면, 렌터카 사고 분석결과 차량적 요인에 대한 명확한 특징은 나타나지 않았다. 본 연구의 결과는 제주지역 뿐만 아니라 렌터카 운행이 증가하는 지역, 관광지 특성이 강한 지역에서 교통사고 특성 분석 및 교통안전대책 수립과정에서 유용하게 활용될 수 있을 것으로 판단된다.

• 한국자동차공학회논문집
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• 제19권4호
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• pp.137-145
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• 2011

This paper suggests possible rear body shape modifications of a passenger car for the improvement of aerodynamic performance, based on the CFD analysis results. YF SONATA, a passenger car of Hyundai Motors Company, plays a major role as the baseline car in this research. Representatively, three parts(trunk rear edge, side rear edge and rear undercover) are modified in a small range in order for the total outer shapes not to be changed enough so that the modified car is not considered different, compared with the baseline. Specifically, using computational fluid dynamics, aerodynamic drag reduction is accomplished maximally about 11% in this research. Finally, it is proved that although the range of changes of the rear body shapes of a passenger car is very strictly confined, by changing a small range of rear body shapes alone the enhancement of aerodynamic performance of a passenger car can be significantly accomplished.

• 한국소음진동공학회논문집
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• 제23권3호
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• pp.258-266
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• 2013

This paper presents the correlation between psychological and physiological acoustics for the automotive acceleration sound. The research purpose of this paper is to evaluate the sound quality of acceleration sound of a passenger car based EEG signal. The previous method for the objective evaluation of sound quality is to use sound metrics based on psychological acoustics. This method uses not only psychological acoustics but also physiological acoustics. For this work, the sounds of 7 premium passenger cars are recorded and evaluated subjectively by 33 people. The correlation between the subjective rating and sound metrics is calculated based on physiological acoustics. Finally the correlation between the subjective rating and the EEG signal measured on the brain is also calculated. Throughout these results the new evaluation system for the sound quality on the automotive acceleration sound of a passenger car has been developed based on bio-signal.

• 한국자동차공학회논문집
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• 제15권4호
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• pp.33-40
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• 2007

Crashworthiness design is of special interest in automotive industry and in the transportation safety field to ensure the vehicle structural integrity and more importantly the occupant safety in the event of the crash. Front side assembly is one of the most important energy absorbing components in relating to the crashworthiness design of vehicle. The structure and shape of the front side assemblies are different depending on auto-makers and size of vehicles. Thus, it is not easy to grab an insight on designer's intention when you glance at a new front side member without experiences. In this paper, we have performed the explicit nonlinear dynamic finite element analysis on the front side assembly of passenger cars to identify the mechanical roles of major parts in relation to collapse modes from the viewpoint of reverse engineering. To do this, we have performed crash FE analysis for the two different assemblies of small car and heavy passenger car and have compared dynamic behaviors of the two.