• Title/Summary/Keyword: High-speed driving

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High-speed Trains Driving Functions Analysis Using Systems Engineering

  • Noh, Hee-Min
    • International Journal of Railway
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    • v.3 no.3
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    • pp.90-94
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    • 2010
  • In this paper, driving functions of the Korea High-speed Trains were decomposed based on systems engineering architecture. In order to analyze the driving function, various systems engineering tools and methods were used. Moreover, interfaces of decomposed driving functions were analyzed to figure out purposes of the driving functions. Through activity modeling of driving function of the Korea High-Speed Trains, main functions were derived when starting, speeding and stopping. When the high speed train is speeding, pre-departure checks and wheel slide prevention are essential driving activities for the safety and when the high speed train runs high speed, maintaining driving stability by monitoring bogie hunting and monitoring drivers' safe operation by vigilance systems is important. Furthermore, when the train is braking, the driver should checks brake and suspensions as safety actions.

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A Study on Appropriate Driving Speed for High-Speed Trains Running the Conventional Line (기존선을 통과하는 고속차량의 적절한 주행속도에 관한 연구)

  • Ham, Young Sam
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.9
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    • pp.773-776
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    • 2014
  • KTX (Korea Train eXpress) is the first high-speed train operated in Korea and its highest speed reaches 300 km/h. Korean high-speed trains are mostly operated on the railroads exclusively designed for high-speed trains, but the sections of Seoul~Gwangmyeong, nearby of Daejeon station and Dongdaegu are operated on the existing tracks having the speed less than 150 km/h. With this paper, we'd like to analyze the lateral force that occurs between the wheels and the rail when high-speed trains were operated on the existing track section to suggest an appropriate driving speed for high-speed trains. As the rigid wheel base of the high-speed train is 3m which is about 50% longer than normal vehicles, it works as an advantage for high-speed driving. However, as the lateral force becomes higher than normal vehicles when driving on curves, plans to reduce wear-outs on the wheels are required.

A Study on Driver Perception-Reaction Time in High-Speed Driving Situations (고속주행상황의 운전자 인지·반응시간에 관한 연구)

  • Choi, Jaisung;Jeong, Seungwon;Kim, Jeongmin;Kim, Taeho;Shin, Joonsoo
    • International Journal of Highway Engineering
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    • v.19 no.1
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    • pp.107-119
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    • 2017
  • PURPOSES : The desire of drivers to increase their driving speeds is increasing in response to the technological advancements in vehicles and roads. Therefore, studies are being conducted to increase the maximum design speed in Korea to 140 km/h. The stopping sight distance (SSD) is an important criterion for acquiring sustained road safety in road design. Moreover, although the perception-reaction time (PRT) is a critical variable in the calculation of the SSD, there are not many current studies on PRT. Prior to increasing the design speed, it is necessary to confirm whether the domestic PRT standard (2.5 s) is applicable to high-speed driving. Thus, in this study, we have investigated the influence of high-speed driving on PRT. METHODS : A driving simulator was used to record the PRT of drivers. A virtual driving map was composed using UC-Win/Road software. Experiments were carried out at speeds of 100, 120, and 140 km/h while assuming the following three driving scenarios according to driver expectation: Expected, Unexpected, and Surprised. Lastly, we analyzed the gaze position of the driver as they drove in the simulated environment using Smarteye. RESULTS : Driving simulator experimental results showed that the PRT of drivers decreased as driving speed increased from 100 km/h to 140 km/h. Furthermore, the gaze position analysis results demonstrated that the decrease in PRT of drivers as the driving speed increased was directly related to their level of concentration. CONCLUSIONS : In the experimental results, 85% of drivers responded within 2.0 s at a driving speed of 140 km/h. Thus, the results obtained here verify that the current domestic standard of 2.5 s can be applied in the highways designated to have 140 km/h maximum speed.

Analysis of the Influence of the Address Electrode Width on High-speed Addressing Using the Vt Close Curve and Dynamic Vdata Margin

  • Kim, Yong-Duk;Park, Se-Kwang
    • KIEE International Transactions on Electrophysics and Applications
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    • v.5C no.5
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    • pp.183-190
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    • 2005
  • In order to drive the high-density plasma displays, a high-speed driving technology must be researched. In this experiment, the relationship between the width of the address electrode and high-speed driving is analyzed using the Vt close curve and the panel structure for high-speed driving is proposed. In addition we show that the wider the width of the address electrode is, the narrower the width of the scan pulse becomes. Therefore, we could achieve the minimum data voltage of 50.1V at a scan pulse width of $1.0/{\mu}s$ and a ramp voltage of 210V at an address electrode width of $180/{\mu}m$ for the high-speed driving 4-inch test PDP.

Designing a Warning System for Lane Departure during High Speed Autonomous Driving (고속 자율 주행 중 차선 이탈시 경고시스템 설계)

  • kim, Geunmo;Chae, Suhyouk
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2019.05a
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    • pp.18-20
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    • 2019
  • In this paper, in order to prevent accidents when deviating from the lane during high-speed self-driving, we are going to design a warning system that will sound an alarm after recognizing the surrounding situation with a $360^{\circ}$ camera. Accidents often occur while driving on self-driving cars because they try to change lanes excessively or fail to recognize people, animals and objects that appear suddenly when driving at high speeds. The government wants to identify the surrounding situation with cameras when driving off a lane during high-speed autonomous driving, and to create a car that sounds a warning system through a lane departure sensor on the underside of the vehicle to reduce various accidents that occur during self-driving and to have a safer driving system.

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The Characteristics of Driving Behavior and Eye-Movement According to Driving Speed and Navigation-Position while Operation of the Navigation in Driving (주행 중 네비게이션 조작 상황에서 주행속도와 네비게이션 위치에 따른 운전행동 및 안구운동 특성)

  • Hong, Seung-Hee;Kang, Jin-Kyu;Kim, Bo-Seong;Min, Cheol-Kee;Chung, Soon-Cheol;Doi, Shun'ich;Min, Byung-Chan
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.34 no.4
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    • pp.35-41
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    • 2011
  • The purpose of this study was to examine drivers' driving behaviors and eye-movements according to driving speed and navigation- position while operation of the navigation in driving. For this purpose, two driving conditions (low-speed and high-speed) and two navigation-positions (top and bottom location of the center console) were set. Drivers' driving behaviors (speed, speed variation, coefficient of variation, and the number of collisions) and eye-movements (overall eye pattern, the average scanning time of navigation, and the number of gaze-out on the road for more 2 seconds) were measured. As a result, when the navigation was located at the bottom of the console, difficulties of lateral control was appeared in low-speed driving condition, and the that of longitudinal control was appeared in high-speed driving condition. In addition, above situation made the drivers' scanning times of navigation long, increased the number of gaze-out on the road for more 2 seconds, and made overall eye pattern monotonous. These results could be interpreted that the manipulation of the navigation at the bottom of console cause reduced attention capacity due to the cognitive load.

The Influences of Speed desire frustration on Driving Stress (운전자의 속도 욕구좌절이 운전 스트레스에 미치는 영향)

  • Soon yeol Lee ;Soon chul Lee
    • Korean Journal of Culture and Social Issue
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    • v.15 no.2
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    • pp.319-338
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    • 2009
  • This study was intended to recognize whether speed desire frustration influences in driving stress. Stress desire frustration is the difference between prefer speed and normal speed. As a result, driver's the prefer speed is higher than the normal speed on 4 road condition(high-way, urban-way, residential-way, rural-way). Also, driver's speed desire frustration caused statistical effect in driving stress on 4 road condition. speed desire frustration effect Driving Stress Scale(DSS) 5 sub-scale factors(progress obstacle, traffic circumstance, accident & regulation, regulation obedience, time pressure). This is that driver who experience much speed desire frustration creates high driving stress. Speed desire frustration analyzed high driver and low driver's Driving Stress Scale(DSS) score and overspeed regulation and traffic accident experience difference. As analysis result, speed desire frustration high driver driving stress high appear. However, difference of overspeed regulation experience or traffic accident experience by speed desire frustration did not appear.

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Variation Trends of the Contact Force between Pantograph-Catenary and Acceleration Behavior According to the Train Running Speed and Driving Pattern in Korean High Speed Train (열차의 운행패턴과 속도에 따른 한국형 고속전철용 판토그라프의 접촉력과 가속도 거동의 변화 경향)

  • 목진용;김영국;박춘수;김기환
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.05a
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    • pp.200-205
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    • 2004
  • The pantograph for Korean High Speed Train was developed and had been evaluating by through 'G7-R&D project for home grown high speed train technology' In this study, in mechanical aspect, the variation trend of contact force between pantograph and catenary according to the train running speed and driving pattern is conducted. A measuring system for current collecting performance and mechanical characteristics is used for this study, developed and installed on the prototype Korean High Speed Train, and physical characteristics were measured while the KHST runs on the test track. Through this study, remarkable trends of variation are found and analyzed from measured acceleration and vertical contact force between the pan head in pantograph and contact wire in catenary system according to the driving pattern and the train raised a running speed up to 300km/h.

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Analysis of contact force of pantograph for Korean-high speed train according to track conditions and driving patterns (선로조건 및 운전패턴에 따른 한국형 고속열차 판토그라프의 접촉력 특성 분석)

  • Mok, Jin-Yong;Kim, Young-Guk;Lee, Hi-Sung
    • Journal of Sensor Science and Technology
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    • v.14 no.6
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    • pp.438-443
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    • 2005
  • In this paper, we introduce the on-line test of the current collection characteristics for HSR 350x(Korea High Speed Train project) that have been performed in the Kyoung-bu high-speed line since 2002. Through the analysis of measured data during on-line test, the variation trends of contact force between pantograph and catenary according to the track conditions and driving patterns are reviewed. This study shows that the track conditions do not affect on the dynamic performance between pantograph and the driving patterns are important factors in determining the good interaction of them.

Analysis for Stability for Passive Mechanisms of High Speed Mobile Robot on Rough Terrain (야지 고속 주행 로봇을 위한 패시브 메커니즘의 안정성 비교 분석)

  • Kim, Youngjin;Jeon, Bongsoo;Kim, Jayong;Lee, Jihong
    • The Journal of Korea Robotics Society
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    • v.9 no.2
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    • pp.124-131
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    • 2014
  • The robot mechanisms that were previously researched had only been conducted for the purpose of overcoming the obstacles stably at low speed driving and enhancing the stability against high speed circuitous driving, and yet, the mechanism satisfying two purposes. However, in order to stably drive with high speed on rough terrain, there is a need for satisfying both of these purposes, as well as testing the efficiency of the mechanisms at high speed driving. There, this paper simulated some of the passive mechanisms and focused on checking the performances of passive mechanisms through simulations and analyzing each mechanism on the basis of an evaluation index. The simulation was conducted by Adams (The Multi-body Dynamics Simulation Solution) and used various types of passive mechanisms which were introduced in the robotics field. As a result, the study confirmed that passive mechanisms have a number of situations that affect the driving stability on each direction of roll and pitch. Further study is needed about active mechanism.