• Title/Summary/Keyword: Small passenger Car

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Analysis and Small Scale Model Expriment on the Vertical Vibration of the KT-23 Type Passenger Vehicle (KT-23형 여객 차량의 상하 진동 해석 및 축소모형 실험)

  • 최경진;이동형;장동욱;권영필
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.4
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    • pp.266-273
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    • 2003
  • The purpose of this study is to obtain the effects of the parameters of the suspension system in railway rolling-stock for KT-23 type Passenger vehicle. According to the analysis and the small scale model car test. optimal condition was obtained for the stiffness ratio of secondary spring to primary spring of the suspension system and the mass ratio of the bogie frame to the car body. The analysis of the study shows that if the car body mass is increased or secondary stiffness Is lowered, the vertical vibration level is reduced and the passenger comfort can be improved. Especially, strong peaks are occurred in the frequencies corresponding to the rotational speed of driving axle and vehicle wheel. Hence, in order to obtain the dynamic characteristics through the small scale model car, the driving method of the vehicle on the test bench, rotational characteristics of the wheel and the natural modes of vehicle should be investigated and be modified.

A Numerical Study of the Effect of Small Passenger Car's Grille Shape on the Aerodynamic Performance (소형 승용 차량의 그릴 형상이 차량의 공력 성능에 미치는 영향에 관한 수치해석 연구)

  • Kim, Jaemin;Cho, Hyeongkyu;Kim, Taekgi;Kim, Moonsang;Kim, Yongsuk;Kim, Yongnyun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.1
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    • pp.74-87
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    • 2015
  • A numerical parametric study has been accomplished to figure out the effect of grille shape built in a small passenger car on the aerodynamic performance such as drag and mass flow rate through CRFM(Condenser Radiator Fan Module). Three grille opening parameters and three grille mesh parameters are selected and adopted to a simple shape passenger car model. This research will provide a design guideline for grille opening geometry and mesh shape in the grille. FLUENT, which is very well known commercial code, hires k-${\epsilon}$ turbulence model at the driving speed of 110km/h with moving wall boundary condition. A porous media condition is prepared to estimate the pressure drop amount through CRFM parts.

Crush FE Analysis of Front Side Assembly of Passenger Cars for Identifying the Roles of Major Parts Influencing on Collapse Mode with Reverse Engineering (승용차 프론트 사이드 조립체 부품의 역할과 붕괴모드에 관한 역설계적 유한요소 충돌해석)

  • Kim, Yong-Woo;Kim, Jeong-Ho;Jeong, Kyung-Shin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.4
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    • pp.33-40
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    • 2007
  • Crashworthiness design is of special interest in automotive industry and in the transportation safety field to ensure the vehicle structural integrity and more importantly the occupant safety in the event of the crash. Front side assembly is one of the most important energy absorbing components in relating to the crashworthiness design of vehicle. The structure and shape of the front side assemblies are different depending on auto-makers and size of vehicles. Thus, it is not easy to grab an insight on designer's intention when you glance at a new front side member without experiences. In this paper, we have performed the explicit nonlinear dynamic finite element analysis on the front side assembly of passenger cars to identify the mechanical roles of major parts in relation to collapse modes from the viewpoint of reverse engineering. To do this, we have performed crash FE analysis for the two different assemblies of small car and heavy passenger car and have compared dynamic behaviors of the two.

Effects on Aerodynamic Drag Reduction of a Passenger Car by Rear Body Shape Modifications (승용차의 후면 형상 변형이 공기저항 감소에 미치는 영향)

  • Song, Ki-Sun;Kang, Seung-On;Jun, Sang-Ook;Park, Hoon-Il;Kee, Jung-Do;Kim, Kyu-Hong;Lee, Dong-Ho
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.4
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    • pp.137-145
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    • 2011
  • This paper suggests possible rear body shape modifications of a passenger car for the improvement of aerodynamic performance, based on the CFD analysis results. YF SONATA, a passenger car of Hyundai Motors Company, plays a major role as the baseline car in this research. Representatively, three parts(trunk rear edge, side rear edge and rear undercover) are modified in a small range in order for the total outer shapes not to be changed enough so that the modified car is not considered different, compared with the baseline. Specifically, using computational fluid dynamics, aerodynamic drag reduction is accomplished maximally about 11% in this research. Finally, it is proved that although the range of changes of the rear body shapes of a passenger car is very strictly confined, by changing a small range of rear body shapes alone the enhancement of aerodynamic performance of a passenger car can be significantly accomplished.

Passenger & Car Carrier's Superstructure Vibration induced by the 1st order Excitation of Whirling Vibration on the Propulsion Shafting System (추진축계 횡진동 1차 기진력에 의한 여객.차도선의 선체 상부진동)

  • Lee, D.C.;Ko, J.Y.;Kim, J.R.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2000.11a
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    • pp.301-306
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    • 2000
  • Small passenger and car carrier ships are mainly used as a connection way between land and small islands. And these ships should be designed to enlarge the capacity of passenger and car loading within limited space and draft. So the resonances of various vibrations exist in normal operation range of engine and propulsion shafting. In this paper, hull's superstructure vibration which was especially induced by the 1st order excitation of whirling vibration on the 2-engines and 2-propulsion shafting systems is introduced. Also these are verified via the theoretical analysis using transfer matrix method and FEA software ANSYS and its vibration measurement.

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Effect of the Parameter of Mass Ratio on the Vertical Vibration of the Passenger Vehicle (여객차량의 질량비 변수가 상하진동에 미치는 영향)

  • 최경진;장동욱;유원희;김완두
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11b
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    • pp.1293-1299
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    • 2001
  • The purpose of this study is to analyze the effects of the parameters of the mass ratio of the car body and the bogie frame in railway rolling-stock for KT-23 type passenger vehicle. According to the results of simulation and the small scale car test. optimal condition was obtained for the mass ratio of the car body and the bogie frame. Also. it is usefull to improve the technology of the ride quality of passenger vehicle.

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The Study of Low Extremity Injury under Small Overlap Crash Test (스몰오버랩 충돌 시 하지상해 발생 메커니즘 규명)

  • Kim, Hyun Chul;Nam, Yun Sik;Kim, Byoung Chul;Kim, Ki Il;Kim, Ki Sung
    • Journal of Auto-vehicle Safety Association
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    • v.9 no.1
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    • pp.25-31
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    • 2017
  • Small Overlap test decided on IIHS (Insurance Institute for Highway Safety) evaluates a robustness of the car body and a passenger injury protection. A current vehicle is satisfied with a robustness of the car body for Small Overlap test but not meet the requirements of passenger injuries because it is difficult to inquire into the actual state of injury mechanism for Small Overlap test. The study shows the new injury mechanism which represents the relation between a structure of the vehicle placed with the lift foot and the low extremity injury.

Expriment of the Vertical Vibration for Effect of the Parameter of Stiffness Ratio of the Small Scale Passenger Vehicle (여객차량 현가장치의 강성비 변화에 의한 진동 실험)

  • 최경진;장동욱;권영필;김완두
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.05a
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    • pp.1110-1115
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    • 2002
  • The purpose of this study is to analyze the effects of the parameters of the suspension system in railway rolling-stock for KT-23 type passenger vehicle. According to the results of simulation and the small scale vehicle test. Optimal condition was obtained for the stiffness ratio of the primary spring and secondary spring of the suspension system. When the stiffness ratio was Increased, the vortical vibration was increased on the car body for empty and weight car. The result of this study are stable to use of the optimum parameter of the ride duality of KT-23 type vehicle. Also, it is usefull to development of full scale vehicle dynamomer

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차실 내부소음의 특성과 저감에 관한 실험적 고찰(상)

  • 정주화
    • Journal of the korean Society of Automotive Engineers
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    • v.5 no.2
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    • pp.15-20
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    • 1983
  • The nature and the sources of sound in cars is discussed in the light of many previous works, and the importance of the system resonances inside cars is suggested. An investigation of a 'boom' problem in a small size passenger car is described. It was established that the 'boom' frequencies coincided with engine firing frequency and also with several system resonances. To find out main transmission path of the noise to the car interior, various possible sources were eliminated from the investigation by means of simple modification to the vehicle. Data on the structural modes of the body, and the acoustic modes of the passenger compartment at various forcing cases were obtained to provide better understanding of the problem. It was found that the acoustic resonance responsible for the boom was controlled largely the bending motion of the floor. To investigate the effect of the structural modification to the acoustic response, center floor of the car was reinforced. a great reduction of the noise inside the car especially at the offending speed range, was achieved by this modification.

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Improvement of Passenger Airbag Based on the Injury Assessment of the 5th Percentile Female Dummy (작은 체형의 여성 승객을 고려한 조수석 에어백의 설계 개선)

  • Kwon, Yul;Kim, Kwon-Hee;Son, Chang-Kyu;Kim, Hyung-Il
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.5
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    • pp.1-7
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    • 2012
  • Automobile airbag deployment process has been studied with MADYMO software. Based on the FMVSS208 and USNCAP(United States New Car Assessment Program) regulations, four parameters were chosen for the design improvement with reference to the 5th percentile female passenger dummy: time to fire, vent hole size, tether length and tank test pressure of inflator. Sensitivity analyses based on orthogonal arrays show that enhanced protection of small females can be achieved with improved USNCAP rating within the boundary of FMVSS 208.