• 제목/요약/키워드: freight vehicle

검색결과 112건 처리시간 0.037초

화물컨테이너 운송을 위한 시뮬레이티드 어닐링 기반의 차량경로계획 (Simulated Annealing Based Vehicle Routing Planning for Freight Container Transportation)

  • 이상헌;최해정
    • 산업공학
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    • 제20권2호
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    • pp.204-215
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    • 2007
  • This paper addresses vehicle routing planning in freight container transportation systems where a number of loaded containers are to be delivered to their destination places. The system under consideration is static in that all transportation requirements are predetermined at the beginning of a planning horizon. A two-phased procedure is presented for freight container transportation. In the first phase, the optimal model is presented to determine optimal total time to perform given transportation requirements and the minimum of number of vehicles required. Based on the results from the optimal model, in the second phase, ASA(Accelerated Simulated Annealing) algorithm is presented to perform all transportation requirements with the least number of vehicles by improving initial vehicle routing planning constructed by greedy method. It is found that ASA algorithm has an excellent global searching ability through various experiments in comparison with existing methods.

우리나라 대형 화물차의 통행사슬 분석:활동기반모형 적용 (An Activity-Based Analysis of Heavy-Vehicle Trip Chains)

  • 조창현;김찬성;성홍모
    • 한국경제지리학회지
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    • 제11권2호
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    • pp.192-202
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    • 2008
  • 통행수요예측을 위한 기간의 활동기반모형은 통행자가 어떠한 활동에 무슨 교통수단을 이용하여 도달하고, 어떻게 시간을 소비하고 누구와 같이 활동을 하는지에 대한 물음에 답하기 위해 여객 중심으로 진행되었으며, 활동기반 혹은 통행기반 가구통행실태 조사 자료가 분석에 사용되었다. 본 연구는 여객이 아닌 화물차 운전자를 연구 대상으로 하며, 하루 동안 화물관련 활동이 기록된 자료가 사용된다. 여객의 통행이 통행자의 주관이 강하게 반영된 의사결정의 결과물이라면, 화물의 경우 화주와 운송업체의 영향이 크게 반영된 스케줄의 결과물이라는 차이가 있다. 본 연구는 여객의 활동기반 통행분석의 기법을 적용하여 대형 화물차의 통행사슬을 분석한다. 본 연구는 2005년에 수행된 제3차 전국물류현황조사 자료 중 8톤 이상 대형 화물자동차 운행다이어리 자료를 이용하였으며, 분석에 사용된 자료의 특징은 화물차 운전자가 하루 동안 통행한 운행 일지를 기록한 것으로 적재능력, 적재품목, 적재상태, 도착지, 도착시간 등이 기록된 것이다. 분석 결과, 영업용과 자가용 별로 도착지, 도착지유형, 적재품목 시퀀스에서의 차이를 확인할 수 있었으며, 이들을 통합한 다차원 시퀀스 역시 차이가 있음을 확인하였다.

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화물열차 적재화물의 균형제어 및 안전모니터링기술 적용 연구 (A Study on the Applying of Balancing Control and Safety Monitoring Technology of Cargo on the Freight Train)

  • 한성호;한영재;이석;김영훈
    • 전기학회논문지P
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    • 제66권4호
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    • pp.224-228
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    • 2017
  • Recently, in order to improve the efficiency of freight transportation on existing lines, a new freight train model is needed to develop urgently. The weight balance of the cargo for the freight vehicle is very important for the stability of the running train and the safe transportation of the cargo. For achieving the cargo weight balance, we proposed a Cargo Balancing Control(CBC) system on the Freight vehicle equipped in between under frame of car body and bogie system. The Cargo Safety Monitoring(CSM) system was designed to supervise status of the Cargo on freight train. The monitoring system can display real time status data from sensors and various signals effectively. We suggested that this paper is a very useful approach for keeping the safety of running freight trains on existing lines.

CVO 환경을 고려한 차량 및 화물 운송 최적 모델 (Freight and Fleet Optimization Models under CVO Environment)

  • 최경현;편제범;곽호만
    • 한국산업경영시스템학회:학술대회논문집
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    • 한국산업경영시스템학회 2002년도 춘계학술대회
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    • pp.209-215
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    • 2002
  • In this paper, we propose a freight and fleet optimization model under CVO environment. The model is a kind of multi commodity network flow model based on Vehicle Routing Problem(VRP) and Vehicle Scheduling Problem(VSP), and considering operations and purposes of CVO. The main purpose of CVO is the freight and fleet management to reduce logistics cost and to Improve in vehicle safety. Thus, the objective of this model is to minimize routing cost of all the vehicle and to find the location of commodities which have origin and destination. We also present some computing test results.

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고속화차 한량의 사행동 해석 (Analysis of the Snake motion of One High Speed Freight Car)

  • 이승일;최연선
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2002년도 추계학술대회 논문집(I)
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    • pp.193-201
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    • 2002
  • The development of railway vehicle and bogie involves the proper selection of design parameters not only to achieve high speed but also to reduce the vibration of the train. In this study an analytical model of a high speed freight car is developed to find the critical speed. The high speed freight car can generate the snake motion of the lateral and yawing motion of the car body, the bogie, and the wheelset. Numerical analysis for the nonlinear equation motions with 17 degrees of freedom showed the running stability and critical speed due to the snake motion. Also, the vibration modes of tile high speed freight car was calculated using ADAMS RAIL, which showed that the critical speed have the yawing modes of the car body and the bogie. Finally, this paper shows that the snake motion of the vehicle can be controlled with the modifications of the design parameters.

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물류정보를 활용한 텔레매틱스 기술 개선방안 (Improvement of Telematics Technology Utilizing Logistics Information)

  • 변의석
    • 산업경영시스템학회지
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    • 제32권2호
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    • pp.38-44
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    • 2009
  • Recently, automobile industry expands from mechatronics area through intelligent information area, and the telematics technology is one of the greatest developing points. The telematics is utilizing the on-board-unit of vehicle's communication system, and it provides necessary information and value-added service to vehicles as well as drivers. Most of the telematics offers the solution of searching a route or generates an optimal path. This paper investigates telematics with the logistics point of view, such as freight location tracking, vehicle emergency information, etc. The telematics is a core technology of automobile industry, and it becomes new business paradigm of IP(information provider). Especially, ETA(estimated arrival time) of freight and distribution tracing information are critical issues in the logistics industry. The successful integration with telematics is introduced in the paper.

DMT 화차의 곡선부 주행특성에 관한 연구 (A Study on Curve Running Characteristic of DMT Freight)

  • 이승일;엄범규;이희성;이영엽;김용원
    • 한국소음진동공학회논문집
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    • 제20권4호
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    • pp.373-380
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    • 2010
  • An interest is increased of environment and energy so, importance on railroad high energy efficiency is magnified. And after Gyeong-bu High speed rail is completed, share rate freight transportation of railroad is expected to be gradually increased due to expand investment for railroad and operate mainly freight transportation on convention line. Therefore a research on DMT freight cars is necessary under like this situation. In paper, we developed analysis model for DMT freight car and DMT freight was analyzed numerically using VI-Rail in each condition of railway having different curve and carried out vibration analysis on curving using developed analysis model. And we carried out test on driving stability follow changing curve radius then measure against UIC code 518.

실제 선로조건에 따른 DMT 화차의 탈선안전도 평가 (The Derailment Safety Estimation of DMT Freight for Real Track Condition)

  • 손명선;엄범규;이희성
    • 한국소음진동공학회논문집
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    • 제21권7호
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    • pp.637-642
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    • 2011
  • The DMT freight is judged that economic performance is good because can increase cargoes than existing freight. However, the existing freight cars, each with a different balance to the body structure is bogie because the vibrations may occur. Thus, by minimizing vibration over the existing freight securing the safety of the driving if you will not have major problems in cargoes. In this study, multi-body dynamic analysis tool, VI-Rail using the actually Gyeongbu Railroad line and an empty, full freight condition include curve radius, track irregularity, The DMT freight of the derailed wagons were assessed for safety analysis. Full and empty freight conditions for parity in the Gyeongbu Railroad line(Dongdaegoo${\leftrightarrow}$Kyungsan) derailment safety analysis, such as derailment coefficient and the wheel unloaded, echoing the curve and the orbit is affected by the irregularity was found. Full freight condition than the empty conditions showed a significant derailment safety. Overall, the limits of derailment coefficient(Q/P = 0.8) and wheel unload decrement limits(${\triangle}P/P$ = 0.6) is less safe with me confirmed that the derailment safety.

인과관계맵을 이용한 국내 화물자동차운수시장 구조의 가시화 (A visualization of Korean freight transport industry using causal map)

  • 노홍승;장소영;강상곤
    • 대한교통학회:학술대회논문집
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    • 대한교통학회 2007년도 제57회 학술발표회논문집
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    • pp.210-218
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    • 2007
  • Road freight transport industry in Korea contains many and complicate problems such as over supply of the vehicle caused by rapid policy changes, illegal multilevel transactions, poor truck drivers working environment, lack of road freight transport related statistics and so on. Korean government has developed various logistics industrial policy trying to solve these problems in various ways. However, the relationship among the problems and action plans has been more and more entangled since the part of suggested policies have made another perverted problems. These complex structure of the toad freight transport industry in Korea makes difficult to identify and to solve the problems. Causal map method helps to give a clean picture to understand the complex industry at a glance. This study contributes for visualization of the causal relationships among the existing problems and related policy issues in the road freight transport industry in Korea by causal map. This study could be helpful to develop the actual road freight transport industrial policies including the illogical multilevel and unfair transaction in Korea.

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운전하중하의 레인플로집계법을 이용한 철도차량 무개화차의 피로누적손상과 수명예측 (Fatigue Cumulative Damage and Life Prediction of Uncovered Freight Car Under Service Load using Rainflow Counting Method)

  • 백석흠;이경영;문성준;조석수;주원식
    • 한국자동차공학회논문집
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    • 제13권2호
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    • pp.1-9
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    • 2005
  • An end beam is one of the most important structural members supporting uncovered freight under in-service loading. In general, it needs to endure over 25 years. However fatigue fracture has occurred at dynamic stress concentration location of the end beam because user's specifications demanded high speed and vehicle manufacturer made the uncovered freight car with comparatively low strength and stiffness. For durability analysis, finite element analysis is performed to evaluate the problem of uncovered freight structure and local strain. The uncovered freight car was operated on actual problematic railroad line to measure dynamic stress versus time history on the critical part from which a crack is initiated often. Rainflow cycle counting method was used to estimate fatigue damage at dangerous area under operating condition. Therefore, this study shows that analytical fatigue life at the end beam can be predicted on the basis of S-N curve and structure analysis and has a fairly good correlation with experimental fatigue life.