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A Study on Crash Analysis of Vehicle and Guardrail using a LS-DYNA Program

LS-DYNA 프로그램을 이용한 차량과 가드레일의 충돌해석에 관한 연구

  • 권오현 (가천대학교 대학원 기계공학과) ;
  • 백세룡 (가천대학교 대학원 기계공학과) ;
  • 윤준규 (가천대학교 기계공학과) ;
  • 임종한 (가천대학교 기계공학과)
  • Received : 2016.04.06
  • Accepted : 2016.06.10
  • Published : 2016.06.30

Abstract

A study is to research crash barriers for vehicles that prevent road breakaway of vehicles and protect car passengers and pedestrians as absorbing impulse. Protection performance tests on vehicle passengers were simulated by using a LS-DYNA program. Through repetitive simulation on various speed and angles, passenger protection performance according to different impact condition was contemplated. Variable setting for the simulation was calculated as the mean weight of domestic car sales. By analyzing NASS (National Automotive Sampling System) of NHTSA (National Highway Traffic Safety Administration) of the U.S., the actual speed and collision angle section of accidents were computed. As a result, we confirmed that THIV (Theoretical Head Impact Velocity) and PHD (Post-impact Head Deceleration) are increased according to the impact speed and angle. Also, when the vehicle hit the guardrail post, we could be confirmed that the passenger protection performance greatly decreased.

본 연구는 차량의 도로이탈을 방지하고, 충격량을 흡수하여 차량 탑승자 및 도로주변의 인도를 횡단하는 보행자를 보호하기 위한 차량용 방호울타리에 관한 연구로서 LS-DYNA를 이용해 탑승자 보호성능 평가시험을 시뮬레이션하였으며, 다양한 속도와 각도를 변경하여 반복 시뮬레이션을 하여 충돌조건에 따른 탑승자 보호성능을 고찰하였다. 시뮬레이션을 위한 변수의 설정은 국내차량 판매대수에 따른 평균차량의 중량을 구하고, 미국 NHTSA의 NASS를 분석하여 실제 사고가 발생하는 속도와 충돌각도구간을 검출하였다. 그 결과로 충돌속도와 충돌각도가 커질수록 THIV(탑승자 충격속도)와 PHD(탑승자 가속도) 값이 증가하는 것을 확인하였으며, 차량이 가드레일의 지주에 걸리는 현상이 발생할 때 탑승자보호성능이 크게 저하되는 것을 확인하였다.

Keywords

References

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Cited by

  1. Nonlinear Dynamic Performance and Safety Assessment of Guardrail Structrues for Roadside Considering a Simplified Tangent Modulus vol.9, pp.4, 2018, https://doi.org/10.11004/kosacs.2018.9.4.072