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Alternative Title: Study on the design of lower body shape of a vehicle by using stone chipping phenomena analysis

Abstract: Stone-chiping phenomenon means that the scattering of stones, gravel, and sand of a certain size or weight cause damage of the vehicle. Stone-chipping causes cracks in the underbody of the vehicle and metal exposured to the air cause corrosion. If corrosion occured, The safety of the driver can't be ensured because of the reduction in the life span and durability of the vehicle. The battery and fuel cells take up most of underbody of the electric vehicle, and the damage to the underbody of the vehicle makes a threat to the safety of the driver.
To solve these problems, underbody of the vehicle must be designed to reduce the impact by considering impact areas and the impact forces that occur under the body. In this study, stone-chipping phenomena is analyzed through simulation and experiment. Experimental device and wheel are designed and manufactured for stone-chiping experiments. The wheel is driven by using a servo motor and the impact area of the sand particles was analyzed. In addition, the stone chipping phenomenon is modeled and simulated by using DEM-MBD coupled analysis program. The impact areas analyzed through the experiment is compared with simulation results to verify reliability. About the three shapes, the stone chipping phenomena is simulated and the impact forces on the underbody is confirmed. Also, the geometry suitable for the underbody of vehicle is identified by comparing the impact force.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/23893
http://pknu.dcollection.net/common/orgView/200000294492

Table Of Contents: 1. 서 론 1
1.1. 연구 배경 1
1.2. 연구 동향 3
1.3. 연구의 목적 및 범위 5
2. 스톤 치핑 실험 6
2.1. 스톤 치핑 현상(Stone chipping phenomena) 6
2.2. 비산각 측정실험 7
2.2.1. 실험 장치 설계 및 제작 7
2.2.2. 타이어 구동 및 입자의 운동 계측 10
2.2.3. 모래지 노면 구성 14
2.2.4. 스톤 치핑 현상 발생 시 입자의 비산각 15
2.3. 충격영역 측정실험 19
2.3.1. 실험 개요 및 방법 19
2.3.2. 모래 입자의 충격영역 20
3. DEM-MBD기반 스톤 치핑 모델링 37
3.1. 이산 요소법(Discrete element method) 37
3.1.1. 입자 동역학 37
3.1.2. 접촉 판별 39
3.1.3. 접촉력 모델 40
3.1.4. 타이어와 입자 사이의 접촉 해석 43
3.2. 다물체 동역학(Multibody dynamics) 44
3.2.1. 오일러 매개변수(Euler parameters) 44
3.2.2. 운동 방정식 46
3.3. 이산 요소법과 다물체 동역학 연성 해석 48
4. 스톤 치핑 현상 해석 및 실험비교 49
4.1. 해석 프로그램을 통한 스톤 치핑 모델링 49
4.2. 실험과 시뮬레이션 비교 및 분석 52
4.2.1. 입자의 움직임 비교 52
4.2.2. 입자의 충격영역 비교 56
5. 충격 완화를 위한 차체 하부 설계 63
5.1. 형상에 따른 차체 하부 모델링 63
5.2. 차체 하부 스톤 치핑 시뮬레이션 64
6. 결 론 67
참고문헌 69

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