• Title/Summary/Keyword: car following

Search Result 238, Processing Time 0.029 seconds

Impact Energy Absorbtion Characteristics Review on the Initial Design of TTX Mcp Car front-end Structure (기존선 틸팅차량 Mcp Car 차체 설계초안의 충돌에너지 흡수특성 고찰)

  • Kwon Tae-soo;Jung Hyun-Seung;Koo Jeong-Seo
    • Proceedings of the KSR Conference
    • /
    • 2004.06a
    • /
    • pp.732-737
    • /
    • 2004
  • TTX(Tilting Train Express), which has improved traveling performance on curved track, is being designed in cope with future railway circumstance. Nowadays, in the world, many efforts are focussed on railway safety. Especially, a variety of researches on train crashworthiness have been conducted. As a part of these efforts, some equipments on TTX are designed to reduce fatalities and casualties in crash accidents. This paper introduces impact energy absorbtion characteristics on the initial design of the front end structure. Some comments are made briefly for improvement of initial structural design and future following researches.

  • PDF

Effects of chassis flexibility and engine vibration in ride quality (차체의 턴성효과와 엔진의 진동이 승차감에 미치는 영향분석)

  • Kang, Dong-Kwon;Yoo, Wan-Suk
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.14 no.1
    • /
    • pp.205-213
    • /
    • 1997
  • In this study, dynamic analysis of a passenger car is carried out to analyze ride quality over a random road profile. The front suspension of the car is a MacPherson strut type and the rear suspension is a multi- link type. The following five different models are constructed and compared to see the effects of engine vibration and chassis flexibility in the ride quality. (1) one rigid chassis model, (2) a rigid chassis and rigid engine model, (3) a rigid engine and flexible chassis model with one vibration mode, (4) one flexible chassis model with six engine vibration modes and one chassis vibration mode, (5) one flexible chassis model with seven vibration modes and four static correction modes. The result shows that engine vibration modes and the first bending mode of the chassis are important in the ride quality.

  • PDF

Effects of Suspension Compliance and Chassis Flexibility in Handling Performance (현가장치의 유연성과 차체의 탄성효과가 조종안정성에 미치는 영향 분석)

  • Kang, Dong-Kwon;Yoo, Wan-Suk
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.14 no.7
    • /
    • pp.137-143
    • /
    • 1997
  • In this study, handling simulation of a passenger car is carried out to see the effects of suspension compliance, roll stabilizef bar and chassis flexibility. The front suspension of the car is a MacPherson strut type and the rear suspension is a multi-link type. The following five DADS models are constructed and compared to verify the effects of suspension compliance and chassis flexibility during lane change. (1) Vdhicle model without hard point compliance and stabilizer, (2) Vehicle model with hard point compoiance, (3) Vehicle model with hard point compliance and stabilizer, (4) Vehicle model with hard point compoiance, stabilizer, and one vibration mode of the chaxxis. (5) Vehicle model with hard point compliance, stabilizer, and three vibration modes of the chassis. The result shows that hard point compliance and stabilizer are significant in roll angle, and the flexibility of the chassis affects the yaw angle and yaw rate.

  • PDF

A Study on Emergency Communication Policy and System between Vehicles using Infrared Rays (적외선을 이용한 차량간 긴급통신 정책 및 시스템의 연구)

  • Cho, Myeon-Gyun
    • Journal of Digital Convergence
    • /
    • v.18 no.4
    • /
    • pp.229-236
    • /
    • 2020
  • As the number of elderly drivers increases, traffic accidents from the elderly also increase. In particular, the emergency situation of the elderly driver is not transmitted to the following vehicle during cloudy days and night highway accidents, so it is extended to the second and third accidents, leaving serious aftereffects. Therefore, there is an urgent need to establish an economic and effective inter-vehicle emergency communication system between the accident vehicle of the elderly and the following vehicles. In this paper, we have proposed a policy and method that can take advantage of the special emergency light pattern of an elderly driver in an emergency and transmit it to the following vehicles, thereby providing secondary accident prevention and emergency relief. Furthermore, by introducing an infrared emergency communication system between vehicles using red brake lights and implementing it as a prototype of RC-Car, we have checked the feasibility of the system.

Experience Design Guideline for Smart Car Interface (스마트카의 인터페이스를 위한 경험 디자인 가이드라인)

  • Yoo, Hoon Sik;Ju, Da Young
    • Design Convergence Study
    • /
    • v.15 no.1
    • /
    • pp.135-150
    • /
    • 2016
  • Due to the development of communication technology and expansion of Intelligent Transport System (ITS), the car is changing from a simple mechanical device to second living space which has comprehensive convenience function and is evolved into the platform which is playing as an interface for this role. As the interface area to provide various information to the passenger is being expanded, the research importance about smart car based user experience is rising. This study has a research objective to propose the guidelines regarding the smart car user experience elements. In order to conduct this study, smart car user experience elements were defined as function, interaction, and surface and through the discussions of UX/UI experts, 8 representative techniques, 14 representative techniques, and 8 locations of the glass windows were specified for each element. Following, the smart car users' priorities of the experience elements, which were defined through targeting 100 drivers, were analyzed in the form of questionnaire survey. The analysis showed that the users' priorities in applying the main techniques were in the order of safety, distance, and sensibility. The priorities of the production method were in the order of voice recognition, touch, gesture, physical button, and eye tracking. Furthermore, regarding the glass window locations, users prioritized the front of the driver's seat to the back. According to the demographic analysis on gender, there were no significant differences except for two functions. Therefore this showed that the guidelines of male and female can be commonly applied. Through user requirement analysis about individual elements, this study provides the guides about the requirement in each element to be applied to commercialized product with priority.

Development of Two-lane Highway Vehicle Model Based on Discrete Time and Space (이산적 시공간 기반 2차로 도로 차량모형 개발)

  • Yoon, Byoung Jo
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.31 no.6D
    • /
    • pp.785-791
    • /
    • 2011
  • Two-lane and two-way traffic flow shows various dynamic relationships according to the behaviors of low-speed vehicle and overtaking. And it is essential to develop a vehicle model which simultaneously explains the behaviors of low-speed vehicle and overtaking using opposite lane in order to microscopically analyze various two-lane and two-way traffic flows by traffic flow simulation. In Korea, some studies for car-following and lane-changing models for freeway or signalized road have been reported, but few researches for the development of vehicle model for two-lane and two-way highway have been done. Hence, a microscopic two-lane and two-way vehicle model was, in this study, developed with the consideration of overtaking process and is based on CA (Cellular Automata) which is one of discrete time-space models. The developed model is parallel combined with an adjusted CA car-following model and an overtaking model. The results of experimental simulation showed that the car-following model explained the various macroscopic relationships of traffic flow and overtaking model reasonably generated the various behaviors of macroscopic traffic flows under the conditions of both opposite traffic flow and stochastic parameter to consider overtaking. The vehicle model presented in this study is expected to be used for the simulation of more various two-lane, two-way traffic flows.

Development of Two-lane, Two-way Highway Simulation Program(TWOPAS) for Korean Condition (한국형 2차선도로 모의실험 프로그램(TWOPAS)의 개발)

  • 이진수;최병국;윤녀환;윤항묵
    • Journal of Korean Society of Transportation
    • /
    • v.11 no.1
    • /
    • pp.23-36
    • /
    • 1993
  • The two-lane, two-way highway simulation program(TWOPAS) is evaluated for Korean Highway Capacity Manual Study. TWOPAS program input variables, especially related vehicle performance, traffic flow relationship, car-following model and passing logic are examined and modified through the analysis results of our two-lane, two-way highway traffic characteristics. Simulation outputs with and without modification are compared with the field data. The results show that improved TWOPAS program(TWOPAS KI) is well suitable for simulating our two-lane, two-way highway condition.

  • PDF

Automatic Optimum Control of the Traffic Signal Lights (교통신호의 자동최적제어에 관한 연구)

  • 양흥석;김호윤
    • 전기의세계
    • /
    • v.20 no.4
    • /
    • pp.12-16
    • /
    • 1971
  • The electrical detector and computer systems for traffic flow and speed measurement are demonstrated in this paper. For the best traffic control optimization, linear and non-linear equations in the transition state are dealing with the perturbation of the linear car-following. In the conclusions, we construct a realizable system for the central automatic traffic control with a computer. Furthermore, fixed periodic switching system by manual with the automatic traffic control system is recommended for emergency perturbation.

  • PDF

Design of Secure Scheme based on Bio-information Optimized for Car-sharing Cloud (카 쉐어링 클라우드 환경에서 최적화된 바이오 정보 기반 보안 기법 설계)

  • Lee, Kwang-Hyoung;Park, Sang-Hyeon
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.20 no.11
    • /
    • pp.469-478
    • /
    • 2019
  • Car-sharing services have been settled on as a new type of public transportation owing to their enhanced convenience, expanded awareness of practical consumption patterns, the inspiration for environmental conscientiousness, and the diffusion of smart phones following the economic crisis. With development of the market, many people have started using such services. However, security is still an issue. Damage is expected since IDs and passwords are required for log-in when renting and controlling the vehicles. The protocol suggested in this study uses bio-information, providing an optimized service, and convenient (but strong) authentication with various service-provider clouds registering car big data about users through brokers. If using the techniques suggested here, it is feasible to reduce the exposure of the bio-information, and to receive service from multiple service-provider clouds through one particular broker. In addition, the proposed protocol reduces public key operations and session key storage by 20% on mobile devices, compared to existing car-sharing platforms, and because it provides convenient, but strong, authentication (and therefore constitutes a secure channel), it is possible to proceed with secure communications. It is anticipated that the techniques suggested in this study will enhance secure communications and user convenience in the future car-sharing-service cloud environment.