• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2015년도 제51차 동계학술대회논문집 23권1호
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• pp.163-164
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• 2015

최근 로봇 기술은 전자공학, 컴퓨터, 기계공학 등의 비약적인 발전에 힘입어 다양한 용도에 사용되고 있다. 특히 로봇은 극한 환경에서 인간이 실천하기 어려운 작업을 수행할 수가 있으며, 인간과 함께 운용되거나 인간이 로봇을 무선으로 제어하여 현장을 확인을 할 수 있으며 이를 통하여 화재진압 및 인명구조를 수행할 수 있다. 이 때 무선 제어 로봇은 탐사 시 동체가 전복되더라도 지속적인 탐사가 가능해야 한다. 따라서 로봇의 동체보다 바퀴를 크게 하여 동체가 전복해도 동작이 가능하도록 한다. 본 논문에서는 무선 조정 자동차를 사용 하여 차체의 전복에도 충분히 제어 및 탐사가 가능한지 실험하고, 초음파센서로 하여금 능동적으로 장애물 회피를 하는 것을 목적으로 한다.

• 한국자동차공학회논문집
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• 제18권2호
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• pp.31-38
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• 2010

Bus manufacturers have tested and studied the dynamic collapse behavior of a bus body structure in rollover since UN ECE established ECE Regulation 66 to provide the requirement for the strength of bus structure. In spite of the costly cycles of practical tests, however, it is still a hard task to meet the rollover regulation by means of local reinforcements in the bus structure. Therefore it is necessary to develop a well designed strategy for the rollover strength implemented in the early stage of vehicle development. In this study, the suitable development method for each design stage from a component to complete body structure was considered to make a well-established development process of a bus body structure for rollover safety. For the efficient approach of the concept design stage, a numerical model based on the plastic hinge theory was used instead of detailed shell models. After setting up the concept design for the component size and geometry, the shell model was used to confirm and optimize the whole structure composition. The process developed in this study was practically used as an effective method to predict the rollover behavior of a new bus body structure.

• 타이어
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• 통권242호
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• pp.10-19
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• 2010

제 2의 화이어스톤 사태가 발생했다. 사태를 유발한 주체만 바뀌었을 뿐 금번 도요타 리콜 사태는 포드 익스플로러 전복 사고를 재현한 듯하다. 당시 포드 익스플로러 전복의 원인이 일본 브리지스톤의 미국 자회사인 화이어스톤이 생산한 타이어의 불량 때문이라고 결론 났지만 사고의 정확한 원인이 밝혀졌다고 보기는 어렵다. 금번 도요타 자동차의 급가속 문제의 원인도 오리무중이다. 이하에서는 도요타 리콜 사태의 경과와 원인에 대해 살펴보고 영향을 평가해 본 후 타이어업체 등 국내 기업에게 주는 시사점에 대해 살펴보기로 한다.

• 한국자동차공학회논문집
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• 제7권7호
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• pp.195-201
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• 1999

In Rollover crashes, the development of bus structure to ensure the maintenance of survival space for passengers is very important . So, this paper focuses on understanding the possibility of efficient structural development considering rollover strength through computer simulation using the commercial code, LS-DYNA3D at the initial stage of vehicle development structural members, and impact boundary conditions required by ADR59(Australian Design Rule 59)were applied. In order to confirm the validity of the computational results, the test results. After the usefulness of this method of analysis was confirmed , we have proposed the effective modificationfor rollover strength.

• 한국자동차공학회논문집
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• 제5권6호
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• pp.28-35
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• 1997

Occupant injuries are always possible in a rollover accident, one of the major accidents in a bus. Thus the structure of body frame should have sufficient strength to protect passengers under accidental loads,. ECE(Economic Commission for Europe) regulation No.66 prescribes that residual space shall be preserved in the passenger compartment during and after the structure has been subjected to the prescribed rollover test. Rollover test on a bus section was completed according to the regulation. The coordinates of body section before and after rollover were measured, and it was checked that the structure still complied with the requirements of residual space. Direct measurement on a bus is difficult because of its large size. Thus photogrammetry by photographing and 3 dimensional digital modeling was introduced, and the coordinates of each point were measured through this method.

• 한국자동차공학회논문집
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• 제5권6호
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• pp.148-154
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• 1997

The safety problems of buses have been arisen due to the increasing of road traffic. Occupant injuries are always possible in the rollover accident and the frontal impact. Thus the structure of bus should have sufficient strength to protect passengers under accidental loads. ECE(Economic Commission for Europe) regulation No.66 prescribes that the superstructure of the vehicle shall be sufficient strength for passengers' surviving and the residual space shall be preserved in the passenger compartment during and after the standard rollover accident situation. Rollover test and simulation on a large-sized bus was completed according to the regulation. The coordinates of the points on the bus were measured by photogrammetry system. The rollover situation was revived by structural crashes simulation software, PAM-CRASH, and it was checked that the structure still complied with the requirements of residual space during rollover situation. The residual space was preserved during rollover, so it was proved that the structure of the investigated bus had much probability of survival in rollover accidents.

• 오토저널
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• 제31권3호
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• pp.36-46
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• 2009

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2000년도 가을 학술발표논문집 Vol.27 No.2 (2)
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• pp.517-519
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• 2000

본 논문에서는 3차원 지형 상에서 자동차의 움직임을 사실적으로 실시간에 시뮬레이션하기 위한 계산 모델을 제안한다. 자동차의 동작을 시뮬레이션하기 위해서는 자동차에 적용되는 모든 힘들과 그 힘을 받는 자동차 내의 복잡한 구조에 대한 분석이 필요하다. 자동차 역학 분야에서는 이러한 요소들을 모두 고려하는 분석 모델이 사용되고 있으나, 너무 많은 계산량 때문에 현재의 개인용 컴퓨터에서는 시뮬레이션이나 가상 현실, 게임 등의 응용 분야에서 적용시키기가 곤란하다. 본 논문에서는 자동차의 시뮬레이션에서 반드시 필요한 기본 동작들을 중심으로 비교적 사실적이면서도 계산량을 줄일 수 있는, 단순화된 자동차 동작 모델을 제안한다. 이 모델은 물리학 법칙들에 근거하였으며, 최종 구현된 시스템에서는 비교적 사실적으로 자동차의 주행, 가속, 점프, 전복 등의 동작을 표현할 수 있었다.

• 한국자동차공학회논문집
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• 제22권1호
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• pp.20-28
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• 2014

This paper presents static output feedback LQ and $H_{\infty}$ controllers for rollover prevention. Linear quadratic static output feedback controllers have been proposed for rollover prevention in such a way to minimize the lateral acceleration and the roll angle. Rollover prevention capability can be enhanced if $H_{\infty}$ controller is designed. To avoid full-state measurement for feedback requirement or sensitiveness of an observer to nonlinear model error, static output feedback is adopted. To design static output feedback controllers, Kosut's method is adopted because it is simple to calculate. Differential braking and active anti-roll bar are adopted as actuators that generate yaw and roll moments, respectively. The proposed method is shown to be effective in preventing rollover through the simulations on nonlinear multi-body dynamic simulation software, CarSim.

• 한국자동차공학회논문집
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• 제19권3호
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• pp.113-121
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• 2011

Rollover accident is one of the serious traffic accident and rollover accident takes high portion of all accident. The most common type of rollover is a tripped rollover which occupy 95% of all type of single-vehicle rollover. Tripped rollover occurs when a vehicle leaves normal road way and tripped by loose gravel, soil of fixed object such as guard rail, curbs and ditches. And the rest of the type of rollover is un-tripped rollover. An un-tripped rollovers that occurs during high-speed collision avoidance maneuvers. In this paper, presents the explanation of the un-tripped rollover test method and procedure, additionally this paper deals with various occurrence in the un-tripped test such as occurring excessive tire camber in the un-tripped test, tire side-wall contact with road surface and roll oscillation. And this paper analyzes the analysis of the roll rate amplitude in specific frequency through the FFT (Fast Fourier Transform) and the roll angle at the steering reverse timing which is the Fishhook test roll rate feedback time. Finally, this paper analyzes the relations between the estimated steady state roll gain and rollover stability.