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목차

1. 서론 8

1.1. 연구 배경 및 목적 8

1.2. 문헌 조사 11

1.3. 연구 방법 및 내용 14

2. 타이어와 단품 특성 시험 18

2.1. 타이어의 구조 및 기능 18

2.2. Flat Trac 시험기와 시험 방법 21

2.3. Cornering Stiffness(Cα)[이미지참조] 23

2.4. Lateral Stiffness(KL)[이미지참조] 25

2.5. Relaxation Length(RL) 26

3. Relaxation Length 연구를 위한 타이어 단품 시험 31

3.1. Cornering Stiffness(Cα) 단품 시험 결과[이미지참조] 32

3.2. Lateral Stiffness(KL) 단품 시험 결과[이미지참조] 32

3.3. Flat Trac(FTC) 평가를 통한 Relaxation Length 단품 시험 결과 33

4. Relaxation Length 연구를 위한 유한요소해석 35

4.1. 타이어 모델링 35

4.2. 유한요소해석 결과 36

4.2.1. Cornering Stiffness(Cα) 유한요소해석 결과[이미지참조] 36

4.2.2. Lateral Stiffness(KL) 유한요소해석 결과[이미지참조] 37

4.3. 타이어 Part 강성 Variation 38

4.3.1. Tread Part 강성 Variation 39

4.3.2. Sidewall Part 강성 Variation 41

5. 결과 분석 및 고찰 44

5.1. 유한요소해석 결과와 단품 시험 결과 상관성 분석 44

5.2. Relaxation Length 결과 비교 및 상관성 분석 46

5.3. 타이어 Part 강성에 따른 Relaxation Length 영향도 분석 51

5.3.1. Tread Part 강성 Variation에 따른 Relaxation Length 영향도 51

5.3.2. Sidewall Part 강성 Variation에 따른 Relaxation Length 영향도 59

6. 결론 및 향후 연구 계획 68

6.1. 결론 68

6.2. 향후 연구 계획 70

7. 참고 문헌 72

ABSTRACT 73

표목차

Table 3-1. Cornering stiffness test results 32

Table 3-2. Lateral stiffness test results 33

Table 3-3. Relaxation length test results by FTC test 34

Table 4-1. Cornering stiffness results by FE simulation 36

Table 4-2. Lateral stiffness results by FE simulation 38

Table 4-3. Tread part tuning variation 40

Table 4-4. Sidewall part tuning variation 42

Table 5-1. Cornering stiffness comparison of test and FE simulation 44

Table 5-2. Lateral stiffness comparison of test and FE simulation 46

Table 5-3. Relaxation length comparison of theoretical equation and... 47

Table 5-4. KL, Cα, RL results[이미지참조] 49

Table 5-5. Relaxation length influence with belt width variation 52

Table 5-6. Relaxation length influence with belt angle variation 53

Table 5-7. Relaxation length influence with belt structure variation 55

Table 5-8. Relaxation length influence with rein, belt material variation 56

Table 5-9. Relaxation length influence with rein, belt structure variation 57

Table 5-10. Relaxation length influence with groove depth variation 59

Table 5-11. Relaxation length influence with bead filler height variation 60

Table 5-12. Relaxation length influence with side reinforcement variation 61

Table 5-13. Relaxation length influence with carcass material variation 63

Table 5-14. Relaxation length influence with carcass turn up height variation 64

그림목차

Fig. 1-1. FTC target in engineering requirement 16

Fig. 1-2. Stiffness map 16

Fig. 1-3. Research method 17

Fig. 2-1. Tire structure diagram 18

Fig. 2-2. Belt cord structure 19

Fig. 2-3. Reinforcement belt structure 21

Fig. 2-4. Flat Trac machine and standard sweep(SL0) test 22

Fig. 2-5. Slip angle input of standard sweep(SL0) test 22

Fig. 2-6. Slip angle input of FTC test 23

Fig. 2-7. Tire slip angle(α) and cornering stiffness by load 24

Fig. 2-8. Lateral stiffness KL test[이미지참조] 25

Fig. 2-9. Lateral stiffness test data 26

Fig. 2-10. Relaxation length 27

Fig. 2-11. Relaxation length model 30

Fig. 4-1. Tire layout and mesh by SLM 35

Fig. 4-2. Cornering stiffness result by ISLM 37

Fig. 4-3. Lateral stiffness simulation 38

Fig. 4-4. Tread part stiffness map 41

Fig. 4-5. Sidewall part stiffness map 43

Fig. 5-1. Cornering stiffness correlation of test and FE simulation 45

Fig. 5-2. Lateral stiffness correlation of test and FE simulation 46

Fig. 5-3. Relaxation length correlation of theoretical equation and Flat... 48

Fig. 5-4. Relaxation length correlation of without correlation equation... 50

Fig. 5-5. Relaxation length correlation of correlation equation... 50

Fig. 6-1. Relaxation length influence by tread part stiffness variation 65

Fig. 6-2. Relaxation length influence by sidewall part stiffness variation 65

초록보기

This study is about Relaxation length prediction through finite element analysis. Relaxation length is a factor important for handling performance, among the Functional tire characteristics required by Car makers.

To analyze the correlation, Cornering stiffness, Lateral stiffness, Relaxation length obtained from the actual tire tests were compared and analyzed with the values obtained through finite element analysis.

It was found that the absolute values of Cornering stiffness and Lateral stiffness through actual tire test and finite element analysis were different but highly correlated. Also, The theoretical calculated Relaxation length and the Relaxation length through Flat Trac FTC test were highly correlated.

It was confirmed that the calculation of the Relaxation length by converting Lateral stiffness and Cornering stiffness obtained through finite element analysis using the correlation equation obtained, can be predicted by improving accuracy.

Based on the above correlation, FE model was created by variation of design factors that change stiffness of Tread part and Sidewall part, and the influence of Relaxation length were analyzed through finite element analysis. Finally, Relaxation length effects of 14 design factors affecting the Tread part and 7 design factors affecting Sidewall part could be quantified.

If the study data is more stacked and refined, it is not necessary to actually manufacture the tires and conduct a single-product test to meet the Relaxation length target required by the Car maker. After Referring the effects of Relaxation length on design factors and creating FE model considering Trade-Off performance of tire, If Relaxation length calculated by finite element analysis, an optimized structure design can be made to reach the target value quickly.

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