• 제목/요약/키워드: heavy vehicle

검색결과 513건 처리시간 0.028초

도로교통 소음지도 제작시 데이터 오차의 유효범위에 대한 연구 (A Study on the Acceptable Range of Data Error in Road Traffic Noise Mapping)

  • 박수진;고준희;장서일;이병찬;송귀석;김재선
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 춘계학술대회논문집
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    • pp.628-632
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    • 2007
  • The purpose of study is to confirm a acceptable range of data errors in data collecting. To examine a acceptable range of data errors, emission level is calculated for a vehicle flow and heavy vehicle percentage as a function of small-sized velocity. According to road selected, noise level of detail influence road noise calculations. It can be concluded that a vehicle flow raised an error less than 5000(veh/h) for a maximum error in emission level of 3.01dB, and the more a heavy vehicle percentage have a low value, the more emission level is a slight difference. This analysis gives insight regarding the accuracy of traffic flow data that is needed to reach a certain level of accuracy for the resulting noise level.

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공기 유압식 브레이크 라인 파손 사례 및 파손 분석 연구 (A Case Study on Failure and Analysis of Air Over Hydraulic Brake Line)

  • 박정만;박종진
    • 자동차안전학회지
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    • 제12권2호
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    • pp.47-55
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    • 2020
  • In this case study, the brake line failure of air over hydraulic(AOH) brake system is described. AOH brake system is applied to commercial vehicles between 5 to 8 tons. It consists of a hydraulic system using compressed air and operates the air master to form hydraulic pressure to transfer braking power to the wheels. When the brake lines of the system applied to vehicles with high load capacity are damaged, the braking force of one shaft is lost, and the braking distance increases rapidly, leading to a big accident. Failure of the brake line occurs due to various causes such as road surface fragmentation, corrosion of the line, and aged deterioration of air brake hose. The braking force could be decreased even when a very small break in the form of a pin-hole occurs. However, it is difficult to find a part where the thickness of the line is thin due to stone pecking or corrosion generated in the pin-hole formed on the brake line located under the lower part of the vehicle by the sensory evaluation or the conventional braking force test. Accordingly, it is necessary to analyze the condition and cause of the failure of the brake line more precisely when the accident investigation of the heavy vehicles, and also to examine the necessity of the advanced test for the aged brake line.

Performance of bridge structures under heavy goods vehicle impact

  • Zhao, Wuchao;Qian, Jiang;Wang, Juan
    • Computers and Concrete
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    • 제22권6호
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    • pp.515-525
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    • 2018
  • This paper presents a numerical study on the performance of reinforced concrete (RC) bridge structures subjected to heavy goods vehicle (HGV) collision. The objectives of this study are to investigate the dynamic response and failure modes of different types of bridges under impact loading as well as to give an insight into the simplified methods for modeling bridge structures. For this purpose, detailed finite-element models of HGV and bridges are established and verified against the full-scale collision experiment and a recent traffic accident. An intensive parametric study with the consideration of vehicle weight, vehicle velocity, structural type, simplified methods for modeling bridges is conducted; then the failure mode, impact force, deformation and internal force distribution of the validated bridge models are discussed. It is observed that the structural type has a significant effect on the force-transferring mechanism, failure mode and dynamic response of bridge structures, thus it should be considered in the anti-impact design of bridge structures. The impact force of HGV is mainly determined by the impact weight, impact velocity and contact interface, rather than the simplification of the superstructure. Furthermore, to reduce the modeling and computing cost, it is suggested to utilize the simplified bridge model considering the inertial effect of the superstructure to evaluate the structural impact behavior within a reasonable precision range.

A new bridge-vehicle system part I: Formulation and validation

  • Chan, Tommy H.T.;Yu, Ling;Yung, T.H.;Chan, Jeffrey H.F.
    • Structural Engineering and Mechanics
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    • 제15권1호
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    • pp.1-19
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    • 2003
  • This paper presents the formulation of a new bridge-vehicle system with validation using the field data. Both pitching and twisting modes of the vehicle are considered in the contribution of the dynamic effects in the bridge responses. A heavy vehicle was hired as a control vehicle with known axle weight, axle spacing and spring coefficients. The measured responses were generated from the control vehicle running at a particular speed at a test span at Ma Tau Wai Flyover. The measured responses were acquired using strain gauges installed beneath the girder beams of the test bridge. The simulated responses were generated using BRVEAN that is a self-developed program based on the proposed bridge-vehicle system. The validation shows that the bridge model is valid for representing the test bridge and the governing equations are valid for representing the motion of moving vehicles.

AI-Diecasting 공법을 적용한 경전철용 AC 견인전동기 개발 (The Development of AC Traction Motor by AI-Diecasting Process for LRV)

  • 이정일;박정태;이종인;권중록;우종열;조봉환
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2000년도 하계학술대회 논문집 B
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    • pp.1006-1008
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    • 2000
  • In this material, a traction motor for light railway vehicle was developed. Aluminium -Diecasting process was selected in order to reduce the manufacturing cost of making rotor bars and rotor rings of the motor, instead of copper or copper alloy rotor bars and rotor rings. And the results of experiment satisfied the international standard IEC 349-2.

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이미지 트래킹 기반 상용차용 차선 이탈 및 전방 추돌 경고 방법 (Image Tracking Based Lane Departure Warning and Forward Collision Warning Methods for Commercial Automotive Vehicle)

  • 김광수;이주형;김수궐;배명원;이덕진
    • 대한기계학회논문집A
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    • 제39권2호
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    • pp.235-240
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    • 2015
  • 디지털 기기의 발달과 더불어 능동안전시스템 또한 비례적으로 발달됨에 따라 4.5 톤 이상 중대형상용차에도 능동안전시스템에 대한 요구가 대두되고 있다. 승용차량과 달리 중대형 상용차량 경우 카메라 장착 위치가 상대적으로 높아 차선 인식에 불리한 조건을 가지고 있다. 본 논문에서는 공간영역처리 기반 중 하나인 소벨 에지(Sobel Edge) 추출과 허프 변환(Hough Transform) 기법과 색 변환보정 기법으로 국내 도로 환경에 맞는 차선 인식에 대한 방법을 제시하고, 영상을 통한 전방의 차량을 인식하는 객체 인식 기법 중에 Haar-like 기법, Adaboost 기법, SVM 기법, Template Matching 기법 등을 적용 및 분석을 통하여 검출 오류를 줄이기 위한 전방 차량 인식 방법을 제안한다. 성능검증을 위해서 실차평가를 실시하였으며, 차선 인식에 대해 98% 이상의 높은 인식률을 얻었다.

첨단안전장치 장착 버스의 사고사례 분석 (Analysis for Traffic Accident of the Bus with Advanced Driver Assistance System (ADAS))

  • 박종진;최영수;박정만
    • 자동차안전학회지
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    • 제13권3호
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    • pp.78-85
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    • 2021
  • Recently a traffic accident of heavy duty vehicles under the mandatory installation of ADAS (Advanced Driver Assistance System) is often reported in the media. Heavy duty vehicle accidents are normally occurring a high number of passenger's injury. According to report of Insurance Institute for Highway Safety, FCW (Forward Collision Warning) and AEB (Automatic Emergency Braking) were associated with a statistically significant 12% reduction in the rate of police-reportable crashes per vehicle miles traveled, and a significant 41% reduction in the rear-end crash rate of large trucks. Also many countries around the world, including Korea, are studying the effects of ADAS installation on accident reduction. Traffic accident statistics of passenger vehicle for business purpose in TMACS (Traffic safety information Management Complex System in Korea) tends to remarkably reduce the number of deaths due to the accident (2017(211), 2018(170), 2019(139)), but the number of traffic accidents (2017(8,939), 2018(9,181), 2019(10,095)) increases. In this paper, it is introduced a traffic accident case that could lead to high injury traffic accidents by being equipped with AEB in a bus. AEB reduces accidents and damage in general but malfunction of AEB could occur severe accident. Therefore, proper education is required to use AEB system, simply instead of focusing on developing and installing AEB to prevent traffic accidents. Traffic accident of AEB equipped vehicle may arise a new dispute between a driver's fault and vehicle defect. It is highly recommended to regulate an advanced event data recorder system.

대형천연가스차량에서 촉매시뮬레이션에 의한 배출가스의 변환율 예측 연구 (A Conversion Rate Prediction Study of Exhaust Gas by Catalyst Simulation in Heavy Duty Natural Gas Vehicle)

  • 한영출;오용석;강호인
    • 한국대기환경학회지
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    • 제16권3호
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    • pp.257-264
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    • 2000
  • An aftertreatment device which reduce exhaust gas of natural gas vehicle(NGV), NGV catalyst has important meaning as to reduce the exhaust emission. In this study, the characteristics of NGV catalyst were investigated and the effect parameters of NGV catalyst were analyzed and were predicted by changing the various parameters such as temperature, and gas concentration. The conversion efficiency of NGV catalyst converter was also predicted by Pd-loading, mass flow rate and gas composition.

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차량의 미래위치 추정을 위한 수동추적 시스템의 디지털 필터 설계 (A digital filter design applied to the manual tracking system to predict future position)

  • 박용운;강윤식;김상원
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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    • pp.1332-1335
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    • 1996
  • It is very important to predict the future position for the heavy vehicle with evasive maneuvering. In this paper, we considered for the manual image tracking system. The vehicle images are received from gyro stabilized mirror system, pass through the optical lens, processed, and displayed on the TV monitor. The operator try to lay the reticle to the center of vehicle image. When the vehicle is moving, the mirror platform (actually the line of sight) should follow the vehicle and the angular rate information is picked up from the mirror stabilized system. This rate signal should be used to predict the future vehicle position. The problem is that the visual system of the human operator is in the closed loop system. The rate signals are disturbed by the operator. In addition, there are some non linearities concerned with the control handle bar and the servo control system. The proposed Kalman filter, combined with some modifications for operator disturbance rejection, improved the predication of the future vehicle position when compared with the conventional passive filter used.

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4륜 조향 무인 컨테이너 차량(AGV) 시스템의 동특성 분석 (Analysis of Dynamic Characteristics for Four-Wheel-Steering Automated Guided Vehicle(AGV) System)

  • 최재영;이영진;변성태;이권순;이만형
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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    • pp.306-306
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    • 2000
  • This paper analyze the dynamic characteristics of Automated Guided Vehicle(AGV) which is being developed as a part of automation in port through DADS, one of the multi-dynamic analysis program, Previous evaluation of a vehicle is carried out through the continuous driving test of a real vehicle, however this method raise the loss of finance and time. If it is possible to analyze the dynamic characteristics of vehicle before construction completely we can compensate the loss of money and time during constructing. AGV contained containers is very heavy and its center of gravity can be easily changed with the disturbance from road or cornering. It makes AGV unsatisfied, therefore we evaluate the handling characteristics and stability of the full vehicle model. This paper contribute to establish the foundation of the development of a new system like a AGV which have a special structure.

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