• 한국강구조학회 논문집
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• 제14권1호
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• pp.95-104
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• 2002

본 연구에서는 타이어의 접지폭을 고려한 새로운 3차원 차량모델을 개발하여 차량의 동적하중에 대하여 연구하였다. 3차원 차량모델에는 타이어의 접지폭과 텐덤 스프링 차륜축의 피칭을 고려하여 대형차량인 2축 차량과 3축 차량을 각각 7-자유도와 8-자유도로 모델링 하였다. 차량의 운동방정식은 Lagrange 방정식을 사용하여 유도하였으며 IMSL에 내장되어 있는 5차 Runge-Kutter 방법을 사용하여 해를 계산하였다. 본 3차원 차량모델을 이용하여 수치해석한 결과와 Whittemore 등이 실시한 실험값을 비교 검토하여 그 타당성을 입증하였다. 수치해석으로 구한 결과는 실험값과 매우 잘 일치하였다. 차량의 동적 해석에서는 2축 차량인 8톤 덤프트럭과 3축 차량인 15톤 덤프트럭이 스탭 범프를 통과할 때와 여러 가지 종류의 도로를 1.0 km 주행하는 동안 발생하는 타이어력의 최대 충격계수를 구하였다.

• 한국지리정보학회지
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• 제11권3호
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• pp.68-79
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• 2008

한국건설기술연구원(KICT)에서는 도로의 안전성 분석을 위해서 도로의 각종 정보를 이동하는 차량을 이용하여 신속하게 취득하고, 이를 토대로 도로의 결함구간을 분석할 수 있는 도로 안전성 조사 분석 차량(RoSSAV, Road Safety Survey and Analysis Vehicle)을 개발하였다. 본 연구를 통해 도로의 안전성에 의심이 되는 지역에 대해서 3차원 도로 모델링을 통한 도로 선형 결함 알고리즘을 개발하였으며, 이를 위해서는 신속하고 정확한 데이터가 수집되어야 한다. 차량에 회전식 레이저 스캐너, GPS(Global Positioning System), INS(Inertial Navigation System), CCD(Charge-Coupled Device) 카메라 그리고 DMI(Distance Measuring Instrument) 등 여러 센서를 장착하여 데이터를 취득하였다. 마지막으로 이들 데이터를 통합하여 3차원 도로 기하(도로 중심선, 도로 경계선), 도로 시설물과 사면을 추출하였다.

• 드라이브 ㆍ 컨트롤
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• 제17권1호
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• pp.13-20
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• 2020

Adaptive neural networks based lateral controller is presented to guarantee path following performance for vehicle lane keeping in the presence of parameter time-varying characteristics of the vehicle lateral dynamics due to the road surface condition, load distribution, tire pressure and so on. The proposed adaptive controller could compensate vehicle lateral dynamics deviated from nominal dynamics resulting from parameter variations by incorporating it with neural networks that have the ability to approximate any given nonlinear function by adjusting weighting matrices. The controller is derived by using Lyapunov-based approach, which provides adaptive update rules for weighting matrices of neural networks. To show the superiority of the presented adaptive neural networks controller, the simulation results are given while comparing with backstepping controller chosen as the baseline controller. According to the simulation results, it is shown that the proposed controller can effectively keep the vehicle tracking the pre-given trajectory in high velocity and curvature with much accuracy under parameter variations.

• 기술사
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• 제9권3호
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• pp.8-19
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• 1976

A set of study has been made on the table of vehicle running costs, officially used by Korean government, in view to clarifay the relative value of costs composition characteristic and reduction rate due to road surface improvement. The amount of vehicle running costs in Korea and of the components, has been compared, with the corresponding value of the USA, Japan, France, Great Britain and Italy. Findings are briefly summerized : vehicle running costs have been found to be generally much expensive in Korea than the four developed countries except Italy; and significant differences have been also found on the pattern of savings for components of vehicle running costs presumable by pavement construction on road surface, between two countries, Korea and the USA.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.298-304
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• 2012

The development of low rolling resistance tire with weight reduction in tire and vehicle may induce high level of tire/road noise, especially the rumble road noise on rough road. In this paper, the design factor for good rumble noise is considered in view of tire and vehicle. For the 3 mid-sized sedans, the rumble noise is very sensitive to the test vehicle. And it is concluded that the tire with high tread part stiffness and low sidewall part stiffness shows best rumble noise performance, and the rumble noise is in trade-off relation with cavity resonance noise. So, it is desirable to select and change proper construction design factors to have good tire/vehicle rumble noise.

• 한국자동차공학회논문집
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• 제16권3호
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• pp.118-126
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• 2008

The levitation stability of a Maglev vehicle utilizing electromagnetic suspension is primarily influenced by the deformation, roughness, and vibration of the guideway. Optimum design for both the vehicle and the guideway is desirable in order to reduce guideway construction cost, while meeting requirements for stability and ride quality. This paper presents an analysis of the levitation stability of the UTM-01, an urban Maglev vehicle, using a numerical simulation. The ODYN/Maglev, a dynamics analysis program, is used to simulate dynamics to evaluate the stability. A running test of the UTM-01 is also carried out to verify the results of the simulation. Using the simulation results, the levitation stability of the UTM-01 can be numerically analyzed at a variety of vehicle speeds.

• 유공압시스템학회:학술대회논문집
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• 유공압시스템학회 2010년도 춘계학술대회
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• pp.49-55
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• 2010

A series hydraulic hybrid vehicle(SHHV) concept has been explored as a potential pathway to an ultra-efficient city vehicle. Improvements in SHHV fuel economy with reduced emissions strongly depend on their supervisory control strategy. Thermostatic control is simple and reliable but it's cause of frequent engine on-off. Therefore, power follower strategy is presented. In this paper, thermostatic control strategy and power follower strategy is compared for the SHHV model developed using AMESim.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 추계학술대회 논문집(I)
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• pp.54-59
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• 2002

In general, the aluminum extrusions are used to the light construction of the high speed rail vehicle structures. However, the research works ok the crashworthy design of the high speed rail vehicle structures are not published sufficiently because the crash test of high speed rail vehicle structures costs high and is complicated. So, a method that can predict crash characteristics of a large size structure like a high speed tail vehicle should be suggested. In this study, the scale model studies are performed to predict the impact energy absorption characteristics of full scale model. In the first place, we verified the theory of scale law using FE-simulation from the crashworthiness point of view. Secondly, we performed the crush test using scale model, made of aluminum sub structure. As a result, we could predict the crash characteristics using scale model by 10∼20% error.

• 대한임베디드공학회논문지
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• 제19권2호
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• pp.101-106
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• 2024

For the commercialization of automated vehicles, it is necessary to create various scenarios that can evaluate driving safety and establish a data system that can verify them. Depending on the vehicle's ODD (Operational Design Domain), there are numerous scenarios with various parameters indicating vehicle driving conditions, but no systematic methodology has been proposed to create and combine scenarios to test them. Therefore, projects are actively underway abroad to establish a scenario library for real-world testing or simulation of autonomous vehicles. However, since it is difficult to obtain data, research is being conducted based on simulations that simulate real road. Therefore, in this study, parameters calculated through individual vehicle trajectory data extracted based on roadside CCTV image-based driving environment DB was proposed through the extracted data. This study can be used as basic data for safety standards for scenarios representing various driving behaviors.

• 한국도로학회논문집
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• 제17권2호
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• pp.135-141
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• 2015

PURPOSES : While driving, drivers are usually limited in communicating with others except for using the horn. Excessive use of the horn may cause noise pollution, quarrels between drivers and pedestrians, damage, etc. This study developed a methodology for environmental adaptation and improvements of vehicle horns. METHODS: In this study, we performed a literature review of previous studies and related technologies regarding the overuse and damage of the horn. The proposed methodology employed the paired comparison method, as well as the semantic differential method. These methods can consider various vehicle horns, such as the Sport Utility Vehicle(SUV) Horn, Van Horn, and Buzzer. In addition, we conducted a factor analysis in order to provide a direction for improvement of future horns. This research provides a means of complimenting existing intellectual property related to vehicle horns. RESULTS: As a result, the most preferred of the selected horns were the Buzzer at 86.7%. In addition, based on the factor analysis, the horns could be classified into pleasantness and comfort factors. The results indicate a positive reaction for various vehicle horns. The horn type and size of the process control have been properly developed considering the position of the vehicle and the surrounding noise measurements. CONCLUSIONS : Based on the proposed methodology, public and private sectors can use fundamental data for reasonable traffic-noise control policies.