• Title, Summary, Keyword: Vehicles

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Priority Decision based on Users' Requirements for the Development of Military Vehicles (군용차량 개발시 고려요소 우선순위 설정 연구)

  • Lee, Bum-Koo;Cho, Yong-Kun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.6
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    • pp.122-129
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    • 2010
  • The military vehicles are necessary to perform various war battle missions but in reality they are not as convenient as the civil vehicles. Thus, it is problematic regarding the satisfaction about convenience, operation, and performances of military vehicles. Since most of military vehicles used in Korea were made by bench-marking the models of United States developed in the latter half of 1970's. It is question whether the current military vehicles can provide the functions and expected performance fully or not if we do not study what the user friendly military vehicles are. This article report soldiers' user satisfaction survey on military vehicles and provide arguments on the priority decision based on users' requirements. Future direction for the development of military vehicles is discussed.

Emission Characteristics of Air Pollutants produced from Idling of Vehicles (차량 공회전시 배출되는 대기오염물질의 배출 특성)

  • 이병규;조성웅;나덕재;정혁용;정광륜;이채복
    • Journal of Environmental Science International
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    • v.8 no.1
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    • pp.27-32
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    • 1999
  • This study identified concentrations of all pollutants emitted from idling of vehicles such as cars, taxis, trucks, and buses. In this investigation we analyzed concentrations of $SO_2$, NOx, CO, and $CO_2$ omitted from exhaust pipe of vehicles as a function of vehicle type, mileage, exhaust volume, and fuel type using the GreenLine. Compact or light cars, which have relatively low exhaust volume, showed much higher exhaust concentrations of $CO_2$, CO, and NOx than those emitted from vehicles with high exhaust volume. Vehicles using light oil showed much higher exhaust NOx concentrations than those of vehicles using gasoline. Vehicles using LPG and compact cars showed very high exhaust CO concentration compared to other vehicles. NOx exhaust concentrations were increased with increasing the mileage of vehicles.

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온라인 전기 자동차를 위한 급전 및 집전 시스템

  • Jung, Gu-Ho;Lee, Kyung-Hun;Kim, Hyung-Guk;Cho, Yang-Jin;Song, Bo-Yun;Son, Young-Dong;Park, Eun-Ha;Choi, Ju-Young;Kong, Byung-O;Huh, Jin;Son, Ho-Sub;Cho, Jung-Gu;Rim, Chun-Taek;Jeon, Sung-Jeub
    • Proceedings of the KIPE Conference
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    • pp.218-219
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    • 2010
  • 온라인 전기자동차는 도로에 매설된 급전선로로부터 유도자계를 통하여 비접촉 방식으로 전기를 집전 받아 정차 및 주행 중에 충전하는 자동차이다. 이러한 비접촉 충전을 위해서는 도로에 매설된 급전 시스템과 차량 하부에 장착된 집전 시스템이 필요하며, 급전 시스템은 다시 급전 인버터와 급전선로로, 집전 시스템은 집전 모듈(pick-up)과 집전 레귤레이터로 구성된다. 본 논문에서는 급집전 시스템 각각의 장치를 소개하며, 더불어 구축된 시스템의 성능에 대해서도 소개한다.

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A Study on the Priority of Users' Requirements for the Development of Military Vehicles by Analytic Hierarchy Process (AHP 기법을 통한 군용차량 개발시 운용자 요구사항 우선순위 설정 연구)

  • Lee, Bum-Koo;Shin, Yong-Cheol;Ryou, Hwang-Bin;Cho, Yong-Kun
    • Journal of Korean Institute of Industrial Engineers
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    • v.36 no.2
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    • pp.117-124
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    • 2010
  • The military vehicles are an inevitable resource that is indispensible to successfully perform modern wars. Military vehicles used in the Korean Army are the copycats of American out-dated military vehicles, but limited to fulfill the specific requirements by the operators. Korean army are nowadays trying to launch a new developmental plan for military vehicles of new concepts by the Korean Army. This article, hence, extracts the necessary factors upon the advancement of military vehicles by the expertises with the operation of military vehicles as well as sufficient experiences about maintenance. Suggesting and setting up the priority, the result makes practical application for the decision of the development of military vehicles.

A Study on The Detection of Multiple Vehicles Using Sequence Image Analysis (연속 영상 분석에 의한 다중 차량 검출 방법의 연구)

  • 한상훈;이강호
    • Journal of the Korea Society of Computer and Information
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    • v.8 no.2
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    • pp.37-43
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    • 2003
  • The purpose of this thesis is to detect multiple vehicles using sequence image analysis at process that detect forward vehicles and lane from sequential color images. Detection of vehicles candidate area uses shadow characteristic and edge information in one frame. And, method to detect multiple vehicles area analyzes Estimation of Vehicle(EOV) and Accumulated Similarity Function(ASF) of vehicles candidate areas that exist in sequential images and examine possibility to be vehicles. Most researches detected a forward vehicles in road images but this research presented method to detect several vehicles and apply enough in havy traffic. To verify the effects of the proposed method, we capture the road images with notebook and CCD camera for PC and present the results such as processing time, accuracy and vehicles detection in the images.

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Vehicle Shadow Removal For Intelligent Traffic System

  • Jang, Dae-Geun;Kim, Eui-Jeong
    • Journal of information and communication convergence engineering
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    • v.4 no.3
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    • pp.123-129
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    • 2006
  • The limited number of roads and the increasing number of vehicles demand the automatic regulation of overspeed vehicles, illegal vehicles, and overloaded vehicles and the automatic charge calculation depending on the type of the vehicle. To meet such requirements, it is important to remove the shadow of the vehicle as processing and recognizing an image captured by a camera. The shadow of the vehicle is likely to cause misclassification of the vehicle type due to diverse errors and mistakes occurring when detecting geometrical properties of the vehicle. In case that shadows of two different vehicles are overlapped, not only the type of the vehicles may be misclassified but also it is difficult to accurately identify the type of the vehicles. In this paper, we propose a robust algorithm to remove the shadow of a vehicle by calculating the luminance, the chrominance, the gradient density of the cast shadow from information acquired using the image subtraction of the background, and to recognize the substantial vehicle figure. Even when it is hard to detect and split a target vehicle from its shadow as shadows of vehicles are attached to each other, our robust algorithm can detect the vehicle figure only. We implemented our system with a general camera and conducted experiments on various vehicles on general roads to find out our vehicle shade removal algorithm is efficient when detecting and recognizing vehicles.

A Study on the Characteristics of Smoke Emissions from Heavy Duty Diesel Vehicles Using a Chassis Dynamometer (차대동력계를 이용한 대형 디젤 차량의 매연 배출 특성 연구)

  • Jin, Kwang-Suk;Lee, Choong-Hoon
    • Journal of the Korean Society of Safety
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    • v.24 no.4
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    • pp.1-10
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    • 2009
  • The characteristics of smoke emissions from diesel heavy duty vehicles which weigh over 5.5 tons was investigated by driving the vehicles with both the Lugdown 3 modes in the chassis dynamometer and tree accelerating mode under no load. The vehicles include commercial vehicles such as bus, microbus, trucks and specialized vehicles, etc. The total numbers of the vehicles tested were 200. The light extinction method was used to measure the smoke emissions from the vehicles tail pipe. The values of the smoke emissions in the tree accelerating mode showed $0{\sim}20%$ band nearly independent of both the mileage and year of production of the tested vehicles, while those in the Lugdown 3 modes showed $0{\sim}99%$ of wide band. The correlation coefficients between the values of the smoke emissions with both the Lugdown 3 modes and the free acceleration mode were 0.12, 0.08, 0.12, respectively. The inspection with Lugdown 3 modes is better one than that with tree acceleration from the point of exact inspection of the diesel vehicles' smoke emission.

Development of Power Measurement Method for Electrified Vehicles (전동화된 자동차의 출력측정방법 개발)

  • Choi, Dongseok;Ryu, Kihyeon;Lee, Jaewan;Park, Yongsung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.7
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    • pp.135-143
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    • 2014
  • Electrified vehicles can be classified with hybrid electric vehicles, battery electric vehicles and fuel cell electric vehicles. These vehicles have two more than energy converters which are the part of a powertrain. It is particularly difficult to estimate the power of hybrid electric vehicles due to two different energy converters with different power characteristics. Therefore, a new power concept for these vehicles is needed. The vehicle power as the new concept for solving this problem was defined in this study. The test method and the procedure were made a development in this study. Four electrified vehicles with different electric fraction were used to validate the method. Two percentage of COV was suggested as a criterion for the maximum vehicles power based on the previous studies. The repeatability of this method was within ${\pm}2$ per cent for the maximum vehicle power and within ${\pm}5$ per cent for the vehicle speed at maximum vehicle power.

A Study on the Recycling Ratio in Major Materials of Expired Railway Vehicles (사용내구연한이 만료된 철도차량의 주요 재질별 재활용률 산정에 관한 연구)

  • Choi, Yong-Sin;Hwang, Dong-Hoon;Lee, Kun-Mo;Lee, Cheol-Kyu
    • Proceedings of the KSR Conference
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    • pp.2278-2282
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    • 2010
  • The regulation involved with railway vehicles is defined by law to protect customer and fundamental safety. The persisting period of domestic railway vehicles in general are 25~30years. Expired railway vehicles are disused in various way. The railway vehicles are consists of recyclable various materials, but there is no standardization or calculating method related with railway vehicles to make disuse scenario. In this study, performed to get a recycling ratio about major materials of domestic subway railway vehicles using ISO 22628 which is Road vehicles-Recyclability and recoverrability method. This research provide foundation for further researches, standardization of EoL stage and recycling railway vehicle.

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Driving safety analysis of various types of vehicles on long-span bridges in crosswinds considering aerodynamic interference

  • Han, Yan;Huang, Jingwen;Cai, C.S.;Chen, Suren;He, Xuhui
    • Wind and Structures
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    • v.29 no.4
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    • pp.279-297
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    • 2019
  • Strong winds threaten the safety of vehicles on long-span bridges considerably, which could force traffic authorities to reduce speed limits or even close these bridges to traffic. In order to maintain the safe and economic operation of a bridge, a reasonable evaluation of the driving safety on that bridge is needed. This paper aims at carrying outdriving safety analyses for three types of vehicles on a long-span bridge in crosswinds by considering the aerodynamic interference between the bridge and the vehicles based on the wind-vehicle-bridge coupling vibration analysis. Firstly, CFD numerical simulations along with previously obtained wind tunnel testing results were used to determine the aerodynamic force coefficients of the three types of vehicles on the bridge. Secondly, the dynamic responses of the bridge and the vehicles under crosswinds were simulated, and based on those, the driving safety analyses for the three types of vehicles on the bridge were carried out for both cases considering and not considering the aerodynamic interference between the vehicles and the bridge. Finally, the effect of the aerodynamic interference on the safety of the vehicles was investigated. The results show that the aerodynamic interference between the bridge and the vehicles not only affectsthe accident critical wind speed but also the accident type for all three types of vehicles. Such effects are also different for each of the three types of vehicles being studied.