• 자원리싸이클링
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• 제18권1호
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• pp.44-51
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• 2009

이 연구는 신개발 범퍼의 충격흡수성능 시험기준을 적용하여 재활용 범퍼의 충격흡수성능을 실험하고, 재활용 범퍼의 성능 특성을 비교한 것이다. 본 연구에서 적용된 범퍼는 유형이 다른 두 종류의 승용차 외장 범퍼를 선정하여 2종류의 재활용 범퍼를 자동차 안전 기준에 따라 충격흡수성능을 시험하였다. 재활용 범퍼의 충격 흡수성능 실험 결과 2.5마일 범퍼 충격 성능 특성은 동일한 차종의 신품 범퍼의 충격 성능 및 흡수 성능 특성과 거의 동등수준의 충격 성능 특성을 나타내었다.

• 대한기계학회논문집A
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• 제34권1호
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• pp.1-9
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• 2010

본 연구의 목적은 저속충돌에서 승용차량의 범퍼체결구조를 분석하기 위한 것이다. 차량의 손상성-수리성 향상 연구를 위해 범퍼체결구조가 서로 상이한 3개 차종에 대해 RCAR(세계자동차 수리기술위원회)의 저속충돌시험(전,후면 40% 오프셋 충돌시험) 기준을 적용하였다. 시험결과 충격흡수능력은 직사각형 단면형상을 가지고 그 부분이 범퍼레일에 삽입되는 크래시박스식의 범퍼스테이가 대부분의 차량에 적용되고 있는 다른 두 유형의 범퍼체결구조에 비해 우수하게 나타났다. 우수하게 설계된 직사각형 단면형상을 가지는 범퍼체결구조가 저속충돌사고 시 차량의 손상성-수리성을 향상시킴으로써 승객의 안전성도 강화시킬뿐만 아니라 수리비 절감에도 기여할 수 있다는 것이 본 연구에서 입증되었다.

• 한국자동차공학회논문집
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• 제6권6호
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• pp.276-284
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• 1998

Optimum design of bumper beam is investigated using nonlinear CAE structural analysis techniques.In order to minimize its weight, while enhancing structural performances, bumper beam structural analyses were carried out to produce optimum section. Model is composed of bumper beam and stay. First, considering FMVSS safety standard, static strength and energy absorbing capability were estimated for several competitive bumpers through pendulum static analysis, and most promising section was chosen. Next, to ensure dynamic crashworthinesss performance for center pole impact was evaluated for the bumper beam with chosen section through pendulum static analysis, referring to DHS bumper dynamic impact standard. Finally, 2.5 mph bumper beam was designed and its structural performance was estimated. Through this investigation, an optimized bumper beam section with less weight of 20% while maintaining almost equal carshworthiness, compared with a conventional bumper beam section which proved its impact crashworthiness by experiments, was developed.

• 한국자동차공학회논문집
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• 제10권6호
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• pp.125-132
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• 2002

Bumpers are structural components to reduce physical damage to the front and rear ends of a passenger motor vehicle from low speed collisions. Damage assessment and the protectiveness are the commonly used designing criteria but in this study, relative displacements of the bumper are examined. To absorb the crash energy without significant damage to the bumper itself, foam material is installed between fascia and beam. However, it is not easy to predict the exact displacements generated in bumper structures through FEM because the compressive stress-strain curve of a foam material depends on strain rates that deviates significantly on each trial. Under this uncertain condition, a range of displacements is calculated and the optimum design is performed using the design of experiments. The result will be used to find the design that minimizes the weight within displacement constraints. The orthogonal array of L9 is introduced to find the optimum of the design variables that considers the thickness of inner beam, outer beam and stay, This study will suggest the design procedure of a front bumper using the uncertain stress-strain curve of a foam material.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 춘계학술대회논문집
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• pp.817-820
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• 2008

In this paper, a pendulum system is constructed to perform the fundamental research which is concentrated on the various frequency pattern of impact-object simulation tests. Because to reduce injuries of pedestrians, and to satisfy the criterions of the EECV and Euro-NCAP. We analyze the frequency responses to recognize the impact objects. This study will be the basic data to development the smart bumper to protect the pedestrians.

• 한국자동차공학회논문집
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• 제14권5호
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• pp.79-83
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• 2006

The present low speed crash regulations and RCAR test for insurance estimate do not tend to reflect car crash occurred on a road. Therefore, car makers are trying to readjust test standard be similar to a real situation. Passenger cars and SUV vehicles on the market will be subject to this study for car to car crash. In addition, we will discuss improvement of test methods for a low speed crash and direction of bumper design by performing this impact analysis.