• Title/Summary/Keyword: Bus model

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Vibration Reduction of a Large-sized Bus Roof through Change of the Factors Characteristics (인자 특성 변화를 통한 대형버스의 루프 진동 저감)

  • Kuk, Jong-Young;Park, Jong-Chan;Lim, Jung-Hwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.6
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    • pp.138-144
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    • 2010
  • If the vibration is occurred in a large-sized bus roof, it makes people annoying and complaining the quality of a large-sized bus. So in design stage, it must be considered. To assess vibration at the roof which is equipped with air conditioner in design stage, finite element model is constructed. Computer simulation analysis and experimental method are performed. The dynamic characteristics of the large-sized bus are found by using eigenvalue method. It is related with dynamic behavior. The running conditions of a large-sized bus are velocity and road condition which followed experimental conditions. And the frequency response of a large-sized bus is well correlated with analysis result. Modal participation method is used for finding major modes at each peak. Using this method, we found that front and rear suspension system, engine mounting system and roof structure are the major reasons of the roof vibration. To reduce vibration level of roof in a large-sized bus, spring stiffness of front and rear suspension system, spring stiffness of engine mounting system and roof structure are properly combined. From this study, the vibration characteristics of the roof structure of a large-sized bus can be to a satisfactory level.

An architecture and its performance evaluation of a multiprocessor based programmable controller(MBPC)

  • Kim, Jong-Il;Kwon, Wook-Hyun;Park, Hong-Sung
    • 제어로봇시스템학회:학술대회논문집
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    • 1987.10a
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    • pp.863-869
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    • 1987
  • INFOBUS, which has been designed as a system bus of a multiprocessor system, will be introduced. And the concepts of the multiple transfer and ORed write transfer will be described. These concepts make INFOBUS to be well suited for use as the system bus of the multiprocessor based programmable controller(MBPC). In addition, the mean data transfer time through INFOBUS, which is one of the most significant performance of a bus, will be obtained by analysis and simulation. Next, MBPC which uses INFOBUS as its system bus will be introduced, and some basic characteristics of MBPC will be described. The construction of exact model for MBPC will be given and simulated using SDL/SIM package. The reference system of our model will be briefly described also. Some results from the simulation will be given and validated.

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Measuring Social Benefit of Mitigation of In-Vehicle Congestion Level in Intercity Buses (광역버스 차내혼잡도 완화의 경제적 편익측정에 관한 연구)

  • RYU, Sikyun;HAN, Siwon;YOU, Jaesang
    • Journal of Korean Society of Transportation
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    • v.34 no.6
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    • pp.523-534
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    • 2016
  • The purpose of this study is to develope a method for measuring social benefit by mitigating in-vehicle congestion level in intercity buses. Contingent valuation method and Tobit model are adopted for social benefit evaluation method. One thousand passengers were interviewed with 992 obtained valid samples. Tobit models with age, income level, and bus boarding times as explanatory variables are selected to estimate the willingness to pay for the mitigation of intercity bus in-vehicle congestion. Statistically and logically, two models with age or income level as explanatory variables are turned out to be valid. The intercity bus service supply status and usage are examined and the bus users who have willingness-to-pay for the intercity bus in-vehicle congestion mitigation have been identified. In case of the 'no standing' rules implemented to the intercity bus, the annual economic benefit from the service is estimated to be 14.7 billion won.

Development of a Finite Element Model for Crashworthiness Analysis of a Small-Sized Bus (소형버스 정면 충돌 특성 해석을 위한 유한요소 모델의 개발)

  • 김학덕;송주현;오재윤
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.1
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    • pp.153-161
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    • 2002
  • This paper develops a finite element model for crashworthiness analysis ova small-sized bus. The full vehicle finite element model is composed of 31,982 shell elements,599 beam elements,42 bar elements, and 34,204 nodes. The model uses four material models (such as elastic, elastic-plastic(steel), rigid. and elastic-plastic (rubber) material model) of PAM-CRASH. The model uses four contact types to define sliding interfaces in ten areas. A frontal crash test using an actual vehicle with 30mph velocity to a rigid barrier is carried out. Vehicle pulses at lower part of left and right b-pillar are measured, and deformed shapes of frame and driver seat's lower left area are photographed. A frontal crash simulation using the developed full vehicle finite element model is performed with PAM-CRASH installed in super computer SP2. The simulation is performed with the same conditions as the test. The measured vehicle pulses and photographed deformed shapes from the test are compared to ones from the simulation to validate the reliability of the developed model.

A Study on the Safety-Maximizing Design of Exclusive Bus Lanes (안전성 제고를 위한 버스전용차로 디자인 연구)

  • Yang, Chul-Su
    • Journal of Korean Society of Transportation
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    • v.30 no.4
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    • pp.21-32
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    • 2012
  • Exclusive bus lane (EBL) is typically located in the roadway median, and is accessed by weaving across the GPLs(general purpose lanes) before entering from the left lane of the GPLs. To maximize the potential for successful EBL operations, a critical design issue that requires special attention is the length of bus weaving section before entering EBL. The process of developing guidelines for the length of bus weaving section can be supported by a sensitivity analysis of performance measure (safety) with respect to the bus weaving distance. However, field data are difficult to obtain due to inherent complexity in creating performance measure (safety) samples under various interesting flows and bus weaving distance that are keys to research success. In this paper, VISSIM simulation is applied to simulate the operation of roadway weaving areas with EBL, and based on vehicle trajectory data from microscopic traffic simulation models, the Surrogate Safety Assessment Model (SSAM) computes the number of surrogate conflicts (or degree of safety) with respect to the bus weaving distance. Then, a multiple linear regression (MLR) model using safety data (number of surrogate conflicts) is developed. Finally, guidelines for bus weaving distance are established based on the developed MLR. Developed guidelines explicitly indicate that a longer bus weaving distance is required to maintain desired safety as weaving volume increases.

Evaluating Value of Information on Bus-Route Concerning on the User's Individual Value (이용자 개인의 버스 환승 노선정보의 이용가치 평가)

  • Park, Yong-Jin;Kang, Sin-Hwa
    • Journal of Korean Society of Transportation
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    • v.22 no.6
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    • pp.89-99
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    • 2004
  • The purpose of this study is to evaluate the value of information on Bus-Route concerning on the User's Individual value. The value of information is estimated with the price of time saving by using the information. The price of unit time for each user is applied to convert the saving time to the cost. To estimate the user's expense from origin to destination the previous model is modified. Bus-travel cost is estimated with variables such as bus-travel time, bus-interval, bus-fare, and the price of walking distance. In this study, to estimate in-vehicle time the bus-travel time model is developed based on the spatial characteristics distinguished by three types of circular-road in the network of Daegu Metropolitan area. For the case study, a set of the origin and destination is selected as Dalsu-gu District Office and East Daegu Train Station respectively. There are several bus-routes which can be used as direct or transferable bus-routes selected. The study showed that when the value of time for individual users is \1,738/hr, there is no benefit to using information of transferable bus-routes. It also showed that the more discount rates of bus fare is increased, the benefit to using information of transferable bus-routes is increased, and that the lower value of time is, the benefit to using information of transferable bus-routes is increased.

Development of Optimal Bus Scheduling Algorithm with Multi-constraints (다중제약을 고려한 최적 버스운행계획 알고리즘 개발)

  • Lee, Ho-Sang;Park, Jong-Heon;Jo, Seong-Hun;Yun, Byeong-Jo
    • Journal of Korean Society of Transportation
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    • v.24 no.7 s.93
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    • pp.129-138
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    • 2006
  • After Seoul has introduced semi-public bus management system(public management-private operation), the Seoul Metro Government needs a scientific management tool for optimal scheduling for bus routes, to reduce unnecessary operations and provide demand responsive service. As a product of this effort, this paper proposes a heuristic model that could minimize total passenger waiting time under the constraints, such as number of vehicles, working conditions, max load point, minimax headway. etc. For verifying the validity of the proposed model, it is applied to an existing bus route. It results that headways in rush hours become decreased and the passenger waiting time could be decreased. In conclusion. it is thought that the Proposed model contributes to efficiency of bus operation.

A Study on the Theme Park Users's Choice behavior: Application of Conjoint Choice Model (Conjoint Choice Model을 이용한 주제공원 이용자들의 선택행동 연구)

  • 홍성권
    • Journal of the Korean Institute of Landscape Architecture
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    • v.28 no.1
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    • pp.19-28
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    • 2000
  • The purposes of this study are two folds: a) to introduce conjoint choice model to research the choice behavior of theme park users, and b) to suggest the strategies to strengthen the competitiveness of theme parks. The major four theme parks in Seoul metropolitan areas were selected as study areas. A leading polling agency was employed to select 432 respondents by probability sampling and to conduct face-to-face interview. Both alternative generating and choice set generating fractional factorial design were conducted simultaneously to meet the necessary and sufficient conditions for calibration of the conjoint choice model. Dummy coding was used to represent the attribute levels, and the alternative-specific model was calibrated. The goodness-of-fit of the model was quite satisfactory($\rho$$^2$=0.47950), and most parameters values had to expected sign and magnitude. Car was preferred transport mode to shuttle bus for visiting theme parks ; however the most ideal attribute levels only were estimated significantly. Most attribute levels of shuttle bus were estimated significantly except the Dream Land, which is the least attractive park among study areas. Simulation results showed that the shuttle bus was a mode worth providing to switch the current car dominant visiting pattern of theme parks, which will be one the effective strategies to attract more patrons, especially for potential users adjacent to parks. Several ideals were suggested for future researches, in terms of utilization of more general utility function and new base alternative, and inclusion of more salient attributes such as constraints in the model.

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Analysis of the Impacts of converged information with tourism and Bus Information Systems on Recreational Bus Travel (관광.BIS 융합정보가 관광.레저 교통수단으로서 버스선택선호도에 미치는 요인분석)

  • Bin, Mi-Young;Jung, Yi-Seok
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.10 no.4
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    • pp.55-64
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    • 2011
  • This study aims to analyze of the impact of converged information with tourism and Bus Information on recreational bus travel. The research has conducted as the following process : A survey was implemented that the user preference behavior as if they were provided a converged information with tourism and bus information on bus usage. As a result, we found that able to using mobile media, having a experience visiting the tourism site, evaluate willingness to pay of the information highly, the 20s age, increasing income variables are concerned with positive relation, and the factors which are using the main mode by auto and having a auto are negative relation on bus usage actively.

Safety Evaluate of Brackets for Bare Chassis of a 30-seated Bus

  • Choi, Wan-Mug
    • International journal of advanced smart convergence
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    • v.11 no.3
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    • pp.215-221
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    • 2022
  • In the manufacturing process of the bus treated as the commercial vehicle, after making the bare chassis which is the basic frame of the vehicle body, the part in which passengers ride is connected. In addition, the necessary parts such as the engine and transmission required for the operation of the bus are connected to the bare chassis. The element connecting the parts such as the boarding part of the passengers, the engine, the suspension and the transmission is the bracket. The device required for driving and operating the vehicle is mounted on the bare chassis using the bracket, which should ensure stability during bus operation. In this study, we were performed stress analysis to evaluate the stability of three types of brackets connecting the bare chassis of a new type of 30-seater bus in the development process and components required for driving and operation. The stress analysis should be preceded by the analysis of boundary conditions considering the loads applied to the brackets according to the material of the bracket to be analyzed and the driving type of the bus. The finite element model for structural analysis of brackets according to the driving type of the bus was used by Altair's Hypermesh 2017, and the solver used for structural analysis was Altair's Optistruct. The stress analysis was performed to present the safe and vulnerable parts of the three brackets.