• Title/Summary/Keyword: High speed crash

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Crash Analysis of Railway Vehicle Structure Using Scale Model (축소모형을 이용한 철도차량 충돌 해석 기법 연구)

  • 김범진;허승진
    • Proceedings of the KSR Conference
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    • 2002.10a
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    • pp.54-59
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    • 2002
  • In general, the aluminum extrusions are used to the light construction of the high speed rail vehicle structures. However, the research works ok the crashworthy design of the high speed rail vehicle structures are not published sufficiently because the crash test of high speed rail vehicle structures costs high and is complicated. So, a method that can predict crash characteristics of a large size structure like a high speed tail vehicle should be suggested. In this study, the scale model studies are performed to predict the impact energy absorption characteristics of full scale model. In the first place, we verified the theory of scale law using FE-simulation from the crashworthiness point of view. Secondly, we performed the crush test using scale model, made of aluminum sub structure. As a result, we could predict the crash characteristics using scale model by 10∼20% error.

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Crash Discrimination Algorithm with Two Crash Severity Levels Based on Seat-belt Status (안전띠 착용 유무에 근거한 두 단계의 충돌 가혹도 수준을 갖는 충돌 판별 알고리즘)

  • 박서욱;이재협
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.2
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    • pp.148-156
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    • 2003
  • Many car manufacturers have frequently adopted an aggressive inflator and a lower threshold speed for airbag deployment in order to meet an injury requirement for unbolted occupant at high speed crash test. Consequently, today's occupant safety restraint system has a weakness due to an airbag induced injury at low speed crash event. This paper proposes a new crash algorithm to improve the weakness by suppressing airbag deployment at low speed crash event in case of belted condition. The proposed algorithm consists of two major blocks-crash severity algorithm and deployment logic block. The first block decides crash severity with two levels by means of velocity and crash energy calculation from acceleration signal. The second block implemented by simple AND/OR logic combines the crash severity level and seat belt status information to generate firing commands for airbag and belt pretensioner. Furthermore, it can be extended to adopt additional sensor information from passenger presence detection sensor and safing sensor. A simulation using real crash data for a 1,800cc passenger vehicle has been conducted to verify the performance of proposed algorithm.

Study on Behavior Analysis of Crash Cushion Using Analysis Data of High-Speed Camera (고속카메라 영상분석 데이타를 이용한 충격흡수시설의 충돌거동 분석에 관한 연구)

  • Jang, Dae-Young;Ko, Man-Gi;Lee, Yoon-Ki;Joo, Jae-Woong
    • International Journal of Highway Engineering
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    • v.11 no.2
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    • pp.75-83
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    • 2009
  • Collision behavior of clash cushion occurs for a second of less than 0.4sec usually so that it is too hard to calculate numerically. Therefore, for development of trash cushion, it rely on full-scale vehicle crash test without any design procedure. Occupant safety indices if calculated from acquired data by data measurement system and collision behavior of vehicle and crash cushion is filming using high-speed camera in the crash test. But practical ufo scope of high-speed camera is limited and it is not using to calculated the occupant safety indices or analyzed the energy dissipated mechanism of crash cushion. This work is to estimate to be suitable or not for compare the data from measurement system with the data from high-speed camera. And also it is to grope for practical use scheme to calculation of occupant safety indices or analysis of collision behavior.

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Scale Modeling Technique for the Crash Analysis of Railway Vehicle Structure (철도차량 충돌 해석을 위한 축소모델링 기법 연구)

  • 김범진;허승진
    • Journal of the Korean Society for Railway
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    • v.5 no.4
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    • pp.231-236
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    • 2002
  • Todays, crash safety requirements of the railway vehicle structures become important design criterion according to the increased driving speed and the lightweight construction. Although the crash analysis using computer simulation can be effectively applied to predict the crash performance of the railway vehicles in the early design stage, the optimized design w.r.t the crash safety could be realized by the crash tests with actual prototype vehicles. However, it is very expensive and time-consuming task to perform the crash test of the railway vehicles. As a measure to cope with the problem, in this paper, the scale modeling technique is suggested and experimentally verified to predict the impact energy absorption characteristics of full scale model of aluminum extrusions sub-structures and the high-speed railway vehicle structure.

A Study on Vehicle Crash Characteristics with RCAR Crash Test in Compliance with the New Test Condition (동일 승용차량에 대한 RCAR 신.구 충돌시험을 통한 차체 충돌특성에 관한 연구)

  • Lim, Jong-Hun;Park, In-Song;Heo, Seung-Jin
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.6
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    • pp.190-194
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    • 2006
  • This research investigates vehicle structure acceleration and vehicle deformation with RCAR crash test. To investigate vehicle damage characteristics in an individual case, it is possible to RCAR low speed crash test. In this study, two tests were conducted to evaluate difference between RCAR new condition and RCAR old condition. A two large vehicles were subjected to a frontal crash test at a speed of 15km/h with an offset of 40% $10^{\circ}$ angle barrier and flat barrier. The results of the 15km/h with an offset of 40% $10^{\circ}$ angle barrier revealed high acceleration value on the vehicle structure and high repair cost compared to the RCAR 15km/h with an offset of 40% flat barrier. So in order to improve damage characteristics in low speed crash of vehicle structure and body component of the monocoque type passenger vehicles, the end of front side member and front back beam should be designed with optimum level and to supply the end of front side member as a partial condition approx 300mm.

A Study on the Development of Test Rig for High Speed Frontal Crash and Test of Members

  • Shin-You. Kang;In-Bae. Chang;Jang, Hye-Jeong
    • International Journal of Precision Engineering and Manufacturing
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    • v.3 no.3
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    • pp.21-27
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    • 2002
  • In this paper, a simple test rig of high-speed crash for the front members of vehicles was developed for the improvement of crashworthiness of vehicle's side rail. The cart hanging the specimen is accelerated up to 35 mph by the traction wire and by the force of freely dropping weight and 1:3 accelerating pulleys. The cart with shock absorbers travels on the rail roads, so it does not transfer any additional vibration to the specimen. In order to measure the energy absorbed by the specimen when it collapse to the wall and during it deform, the two strain gage type load cells are used at the wall place. The test rig rated good to test the specimen like a side rail of vehicle as developing the vehicle's structures in the early design stage.

Testing Equipments for the Evaluation of Dynamic Tensile characteristics and the Crashworthiness of Auto-body Members (차체용 부재의 동적 인장 특성 및 충돌 특성 평가를 위한 시험장비 개발)

  • Huh, H.;Kim, S.B.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.10a
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    • pp.21-24
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    • 2007
  • This paper deals with introduction of testing equipments for the evaluation of dynamic tensile characteristics of auto-body steel sheets and the crashworthiness of auto-body members. The servo-hydraulic high speed material testing machine was developed for tensile tests at the intermediate strain rate to obtain the tensile material properties at the strain rate under 500/sec. The split Hopkinson bar apparatus using the elastic wave was developed for dynamic material characteristics at the high strain rate ranged from 1,000 to 10,000/sec. The servo-hydraulic high speed crash testing machine is the equipment for the evaluation of the collapse load and crashworthiness of auto-body members. High speed carrying truck crashes to specimen with the maximum velocity of 17 m/sec.

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A Study on the Signal Transmissibility of High Frequency Crash Pulse according to the Car Structure Difference (차체 구조 차이에 따른 충돌 고주파 신호 전달성 연구)

  • Park, Dongkyou
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.6
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    • pp.8-15
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    • 2013
  • Wide range frequency pulses occur in a car crash test. Until now, low frequency under 400Hz has been used to determine an airbag deployment criteria. Also, FIS (Front Impact Sensor) has been used to detect the crash pulse in early stage. Nowadays, technology to determine an airbag delpoyment criteria by using a high frequency crash pulse without FIS is being focused on. In this paper, the signal transmissibility of high frequency pulse for two different cars was studied. Also, signal transfer test of high frequency pulse was done by using a high speed ball impact. Signal runtime of the frontal impact is compared with that of the side impact. The signal transmissibility difference due to the car structure difference was discussed and structure change for improving the signal transmissibility was proposed.

A Study on the Development of Test Rig for High Speed Frontal Crash and Test of Members ($\textrm{I}$) (고속충돌시험기 개발 및 부재의 충돌특성 실험에 관한 연구 (I))

  • 강신유;장인배;김헌영;정규진;박경환
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.6
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    • pp.119-126
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    • 2000
  • In this paper. a simple high-speed crash test rig for members of vehicle was developed for the improvement of crashworthiness of vehicle's side rail. The cart hanging the specimen is accelerated up to 35 mph by the force of freely dropping weight and 1:3 accelerating pulleys. The cart with shock absorbers travels on the rail roads, so it does not transfer any additional vibration to the specimen. To measure the test results, two types of accelerator are considered. the one is a strain gage type and the other is a piezo type. The test rig is rated good to test the specimen like a side rail of vehicle as developing the vehicle's structures in the early design stage.

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Simulation of Train Crashes in Three Dimensions (3차원에서의 열차 충돌사고 시뮬레이션 연구)

  • 한형석;구정서
    • Journal of the Korean Society for Railway
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    • v.5 no.3
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    • pp.187-195
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    • 2002
  • It is important to predict the crash behavior of trains to improve their crashworthiness. This paper investigates the simulation of high-speed train crashes in three dimensions using multibody dynamics. At present, little is known about three-dimensional crash simulations. This study shows that it is possible to simulate overriding and lateral buckling, including results from one- or two-dimensional simulations. Several parameters, however, such as computational time and large deformation of structures, need further investigation.