• Title/Summary/Keyword: Bus engine room

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Reengineering of Bus Engine Room Structure for Preventing Thermal Damages (열해현상 방지를 위한 버스 엔진룸 구조개선)

  • 맹주성;윤준용;손한규
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.3
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    • pp.46-55
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    • 2000
  • Four types of different flow inlet models were tested to improve the flow uniformity at the inlet of the radiator and to prevent thermal damages of auxiliary units from the hot air in the bus engine room. Measurements and numerical calculations were performed and their results were in a good agreement with each other. Simultaneously temperature measurements were carried out under the conditions of actual bus driving. As designing the new flow inlet at the partition board which seperates the engine space and radiator space, flow circulation can be achieved and fresh air comes into the engine room from the bottom. It was proved that new inlet makes the one air temperature cooling down in the engine room, the other uniformity improvement.

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Numerical Analysis of the Three Dimensional Flow in a Cavity of the Bus Engine Room (버스 엔진 룸 내 캐버터에서의 3차원 유동해석)

  • Yoon, Joon-Yong;Maeng, Joo-Sung;Kang, Seung-Kyu;Hwang, Yong-Seo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.6
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    • pp.82-90
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    • 1999
  • Numerical analysis of the three dimensional flow in a bus engine room is carried out through this study. The radiator and the fan modeling rare carried out to simulate the flow in an engine room, and the results are focused on the flow in the cavity located in front of the radiator. The numerical simulation results are compared with the experiment . To improve the cooling performance in the bus engine room, the flow inside the cavity is inspected in detail. The complex flow features are found in this region , and the suggestion are made to improve the radiators cooling performance.

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An Analysis of the Thermal Flow Characteristics in Engine-Room and VTRU in accordance with Application of Thermoelectric Device Cooling System to Prevent Overheating of the Korean Navy Ship VRTU (해군 함정 VRTU의 과열방지를 위한 열전소자 냉각장치의 적용에 따른 기관실 및 VRTU 내부 열 유동특성 분석)

  • Jung, Young In
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.9
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    • pp.610-616
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    • 2020
  • This study conducted joint research with the Navy logistics command ship technology research institute to resolve the occurrence of naval vessel's high-temperature warning and equipment shutdown caused by VRTU overheating during summer operation and the dispatch of troops to equatorial regions. The cooling effect was checked according to the installation of a thermoelectric device cooling system, and heat flow and heat transfer characteristics inside VRTU was analyzed using Computational Fluid Dynamics. In addition, the temperature distribution inside the engine room was assessed through interpretation, and the optimal installation location to prevent VRTU overheating was identified. As a result, the average volume temperature inside the VRTU decreased by approximately 10 ℃ with the installation of the cooling system, and the fan installed in the cooling system made the heat circulation smooth, enhancing the cooling effect. The inside of the engine room showed a high-temperature distribution at the top of the engine room, and the end of the HVAC duct diffuser showed the lowest temperature distribution.

A Study for Fire Examples Involved with Absorbing Material Breakaway and Electric Short in Engine Room of a Large Bus (대형 버스의 엔진룸에서 흡음재이탈 및 전기적인 단락에 관련된 화재 사례 고찰)

  • Lee, IL Kwon;Kook, Chang Ho;Ham, Sung Hoon;Lee, Young Suk;Hwang, Han Sub;You, Chang Bae;Moon, Hak Hoon;Lee, Jeong Ho
    • Journal of the Korean Institute of Gas
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    • v.24 no.2
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    • pp.9-14
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    • 2020
  • This paper is a purpose to study the failure examples for a large bus vehicle fire. The first example, the researcher certified the fact that the absorbing material break away from the upper side of engine room because of weaken durability and the fire was produced in engine. The second example, it sought the fact that the fire breaks out by electric short because of over-load of compressor. The third example, it found the fact that the fire took place by heating of bellows upper part that was connected with muffler and exhaust manifold. The fourth example, it knew the fact that the fire occurred because of the electric short inside junction box of crash body part that was located to driver seat rightside. Therefore, the fire of a large bus occurring by decrepit of absorbing material and electric short have to thoroughgoingly manage the damage and dangerousness if it happens.

A Study on the Noise Reduction of the Engine Cooing Fan of an Express Bus by Change of Design Parameters (설계파라미터 변경에 의한 고속버스용 엔진 냉각 팬의 저소음화 연구)

  • Jae-Eung OH;You-Yub LEE;Hyun-Jin Sim;Mon-Kab Joe
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.333.1-333
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    • 2002
  • This paper suggests the noise reduction method of the engine cooling fan. It was estimated the fannoise contribution at the engine room and identified the noise source at the rotating fan by sound intensity method, first. And it has been developed the program for predicting the noise spectrum of axial flow fan. The radiated acoustic pressure is expressed the discrete frequency noise peaks at BPF and its harmonics and the line spectrum at the broad band by the noise generation mechanisms. In this paper it is shown that the comparison of the measuted and calculaed noise spectra of fn for the validation of the noise predictiong program. And this paper presents the characteristics of a fan noise due to modify the design parameters. Accordingly, it was obtained the design parameter values for noise reduction of fan.

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Study for the Cooling Performance Improvement of a Mini Bus (소형버스 냉각성능 향상 연구(I))

  • Lyu, Myung-Seok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.2
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    • pp.10-15
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    • 2005
  • This study was initiated to evaluate the cooling performance of CAC (charged air cooler) and radiator in the engine room of a mini bus. So we had firstly to predict the mass flow rate coming from radiator grille and front bum per opening using computational fluid dynamics (CFD) simulation based on 3D configuration. And simulations were carried out for different cooling module layout and bum per opening hole size on sam e vehicle operating condition. Simulation results show that CAC cooling performance at reverse protecting plate-applying model was much efficient than that of the bum per opening hole size-increasing model in IMTD point of view. Part of the CFD simulation results was com pared to with experimental data. It was confirm ed that the CFD approach using STAR-CD based on pursuing no-com promise solution could provide design engineers with useful design information in the early design stage of vehicle development.

A Study on the Noise Reduction of the Engine Cooing Fan of a Express Bus by Modification of Design Parameters (설계 파라미터 변경에 의한 고속 버스용 엔진 냉각 홴의 저소음화 연구)

  • 이유엽;조용구;이충휘;오재응
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.4
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    • pp.258-265
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    • 2003
  • This paper suggests the noise reduction method of the engine cooling fan. The fan noise contribution to the OASPL of engine room was estimated and the noise source was identified for the rotating fan by sound intensity method. And the program for Predicting the noise spectrum of axial flow fan was also developed. The radiated acoustic pressure is expressed in terms of discrete frequency noise Peaks at BPF and its harmonics and the line spectrum at the broad band by the proposed noise generation mechanisms. In this Paper, it Is shown that the comparison of the measured and calculated noise spectra of fan validates the noise predicting program. And this paper presents the characteristics of the fan noise in order to modify the design parameters. Accordingly, the design parameters were determined for the noise reduction of the fan.

A Study on the Analysis of Bus Machine Learning in Changwon City Using VIMS and DTG Data (VIMS와 DTG 데이터를 이용한 창원시 시내버스 머신러닝 분석 연구)

  • Park, Jiyang;Jeong, Jaehwan;Yoon, Jinsu;Kim, Sungchul;Kim, Jiyeon;Lee, Hosang;Ryu, Ikhui;Gwon, Yeongmun
    • Journal of Auto-vehicle Safety Association
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    • v.14 no.1
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    • pp.26-31
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    • 2022
  • Changwon City has the second highest accident rate with 79.6 according to the city bus accident rate. In fact, 250,000 people use the city bus a day in Changwon, The number of accidents is increasing gradually. In addition, a recent fire accident occurred in the engine room of a city bus (CNG) in Changwon, which has gradually expanded the public's anxiety. In the case of business vehicles, the government conducts inspections with a short inspection cycle for the purpose of periodic safety inspections, etc., but it is not in the monitoring stage. In the case of city buses, the operation records are monitored using Digital Tacho Graph (DTG). As such, driving records, methods, etc. are continuously monitored, but inspections are conducted every six months to ascertain the safety and performance of automobiles. It is difficult to identify real-time information on automobile safety. Therefore, in this study, individual automobile management solutions are presented through machine learning techniques of inspection results based on driving records or habits by linking DTG data and Vehicle Inspection Management System (VIMS) data for city buses in Changwon from 2019 to 2020.

Concentration of $NO_2$ and $SO_{2}$ of Bus Terminals in Seoul (서울시 버스터미널의 이산화질소 및 아황산가스 농도)

  • 손부순;장봉기;김영규
    • Journal of environmental and Sanitary engineering
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    • v.12 no.3
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    • pp.51-59
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    • 1997
  • In this study, we researched the concentration of nitrogen dioxide($NO_{2}$) and sulfur dioxide($SO_{2}$) of indoor(waiting room) and outdoor(place of getting on the bus) at the bus terminals (Kang-Nam, Dong-Seoul and Nam-Bu) in Seoul to recognize the degree of pollution by exhaust gas of the diesel engine vehicles, and examine the factor that might affect air pollution of terminals. The concentration of $NO_{2}$ and $SO_{2}$ were measured in winter and summer, and the results of the analysis are as follows : The mean concentration of $NO_{2}$ was $57.49{\pm}21.86$ ppb and the concentration of outdoor with $64.10{\pm}27.69$ ppb was significantly higher than the indoor with $50.89{\pm}10.92$ ppb (p<0.05), and the highest with $73.54{\pm}25.54$ ppb at Kang-Nam terminal (p<0.01). The mean concentration of $NO_{2}$ was $62.80{\pm}24.74$ ppb in winter and $52.19{\pm}17.50$ ppb in summer, and had a not statistical difference. The mean concentration of $SO_{2}$ was $31.71{\pm}8.73$ ppb and the concentration of outdoor with $31.04{\pm}8.89$ ppb was similar to the indoor $32.29{\pm}8.70$ ppb, and the highest with $32.57{\pm}9.01$ ppb at Dong-Seoul terminal (p<0.05). The mean concentration of $SO_{2}$ in winter with $39.67{\pm}4.10$ ppb was significantly higher than in summer with $23.76{\pm}2.61$ ppb (p<0.01). The concentration of outdoor $NO_{2}$ at Kang-Nam terminal was 104, 84 ppb in winter and 81.20 ppb in summer, and had a statistical difference compared with the concentration of indoor $NO_{2}$ at Dong-Seoul and Nam-Bu terminals. The concentration of indoor $NO_{2}$ and $SO_{2}$ were higher than that of outdoor at Kang-Nam and Dong-Seoul terminals, but on the contrary, lower than that of outdoor at Nam-Bu terminal. The concentration of $NO_{2}$ and $SO_{2}$ at Nam-Bu terminal were lower than those at Kang-Nam and Dong-Seoul terminals. While the concentration of $SO_{2}$ show the large difference between winter and summer, that of $NO_{2}$ dose not.

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