• International Journal of Automotive Technology
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• 제7권6호
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• pp.703-714
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• 2006

The growing concern surrounding rollover incidences and consequences of Sports Utility Vehicles(SUV) have prompted to investigate the sensitivity of critical vehicle parameters on rollover. In this paper, dynamic rollover simulation of Sports Utility Vehicles is carried out using a validated nonlinear vehicle model in Matlab/Simulink. A standard model is considered and critical vehicle parameters like CG height, track width and wheel base are varied within chosen specified limits to study its influence on roll behavior during a Fishhook steering maneuver. A roll stability criterion based on Two Wheel Lift Off(TWLO) phenomenon is adopted for rollover propensity prediction. Further dynamic rollover characteristics of the vehicle are correlated with Static Stability Factor(SSF), Roll Stability Factor(RSF) and Two Wheel Lift Off Velocity(TWLV). These findings will be of immense help to SUV chassis designers to determine safety limits of critical vehicle parameters and minimize rollover incidences.

• 자동차안전학회지
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• 제5권1호
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• pp.50-55
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• 2013

When it comes to commercial vehicles, their unique characteristics - center of gravity, size, weight distribution - make them particularly vulnerable to rollover. On top of that, conventional heavy vehicle brake exhibits longer actuation delays caused in part by long air lines from brake pedal to tires. This paper describes rollover prevention algorithm that copes with the characteristics of commercial vehicles. In regard of compensating for high actuating delay, predicted rollover index with short preview time has been designed. Moreover, predicted rollover index with longer preview time has been calculated by using road curvature information based on environment information. When rollover index becomes larger than specific threshold value, desired braking force is calculated in order to decrease the index. At the same time, braking force is distributed to each tire to make yaw rate track desired value.

• 한국인터넷방송통신학회논문지
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• 제18권2호
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• pp.227-235
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• 2018

최근 자동차 교통량의 증가로 인해 차량 전복사고가 급증하여 이에 따른 인명피해가 증가해왔으며, 이를 방지하기 위한 차량충돌 실험장비 및 해석프로그램 개발 등의 다양한 기술이 진보되고 있다. 본 연구에서는 적용한 차량모델은 미국 FORD사의 EXPLORER 차종이고, Rollover 해석은 차량충돌해석에 상용되고 있는 PC-Crash 프로그램을 이용하여 SUV의 전복사고 거동 및 충돌속도를 예측하였다. 그 해석결과로 FMVSS No. 208 법규를 통한 SUV차량의 실제 Rollover 거동과 비교할 때 유사한 결과를 보여주었으며, 충돌속도 및 롤각의 특성은 1000 msec 이후부터는 다소 오차율이 커지는 경향을 나타냈다. 그리고 NHTSA의 데이터베이스를 활용하여 고찰한 결과로 충돌속도 15~77 km/h, 충돌각도 $22{\sim}74^{\circ}$ 범위에서 전복사고가 가장 많이 발생함을 나타냈고, 실제 사고사례를 적용함으로써 차량 출발 위치, Roof 파손위치, 정지위치를 재현시켜 차량 Roof가 파손될 때 차량속도 및 충돌시간을 예측할 수 있었다.

• 한국정밀공학회지
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• 제21권4호
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• pp.132-139
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• 2004

The open section members have been used as the members of vehicle such as automotives, airplanes and trains. When vehicles are crashed, these members have absorption of the energy and it is necessary for retainment of the survival space, and as the result, the prediction for the displacement of members in this case of the crash of vehicles is very important. The displacements of members in this case of the crash of automotives show combined aspect of both axial collapse and bending collapse. In the rollover accident when bending collapse happen, the collapse of each members is progressed by the plastic hinge which made from bending moment, and therefore the research for the behavior of members under bending moment after collapse is necessary to determine the internal energy which the members can absorb and the deformed shapes of the members on the step of design. In this paper, the characteristics of bending collapse at the members of the open cross-section were studied with experiment and numerical analysis. We made a comparative studied of the result of the experiment, and changed the axis according to the parallel-axis theorem.