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Abstract
A Study on the Self-Loosening Mechanism of Bolt-Nut Joint and Optimal Design of Anti-Loosening Nut using Finite Element Method
Noo-Ree CHOI
Department of Aeronautical & Mechanical Design Engineering
Graduate School of Korea National University of Transportation
Advisor : Joon HWANG, Ph.D.
This paper outlines the Taguchi optimization methodology, which is applied to optimize the anti-loosening nut design parameters in order to reduce self-loosening rotation angle of bolt-nut joint.
The assembly of bolt and nut is the element most widely used for connecting mechanism and structure. However, if the vibration or shock load or repeated load on the bolt in the early stages of the coupling occurs, it can be loosening occurs tensile force of the bolt coupling portion is reduced. This study developed finite element model to simulate mechanism of the loosening process of bolt-nut joint due to shear loading. In this study, using the hex nut of M10XP1.25, was implemented using the structural analysis to the mechanism of loosening of the nut about cyclic loading.
The parameters evaluated the protrude face length, overall height, side hole radius, overall width for anti-loosening nut geometry design to enforce locking compressive force between bolt and nut threads. The appropriate orthogonal array, signal to noise (S/N) ratio and analysis of variance (ANOVA) are employed to analyze the effect of the mentioned parameters on the rotation angle reduction. The optimized anti-loosening nut design result was obtained with 3.76% mass reduction, 12.85% self-loosening rotation angle reduction, 12.7% equivalent stress reduction which is compared with initial anti- loosening nut design. Using Taguchi method for the design of experiments (DOE), it is investigated the significant influence and the parameters interaction effect with minimum number of trials as compared with a full factorial design.
A Study on the Self-Loosening Mechanism of Bolt-Nut Joint and Optimal Design of Anti-Loosening Nut using Finite Element Method
Noo-Ree CHOI
Department of Aeronautical & Mechanical Design Engineering
Graduate School of Korea National University of Transportation
Advisor : Joon HWANG, Ph.D.
This paper outlines the Taguchi optimization methodology, which is applied to optimize the anti-loosening nut design parameters in order to reduce self-loosening rotation angle of bolt-nut joint.
The assembly of bolt and nut is the element most widely used for connecting mechanism and structure. However, if the vibration or shock load or repeated load on the bolt in the early stages of the coupling occurs, it can be loosening occurs tensile force of the bolt coupling portion is reduced. This study developed finite element model to simulate mechanism of the loosening process of bolt-nut joint due to shear loading. In this study, using the hex nut of M10XP1.25, was implemented using the structural analysis to the mechanism of loosening of the nut about cyclic loading.
The parameters evaluated the protrude face length, overall height, side hole radius, overall width for anti-loosening nut geometry design to enforce locking compressive force between bolt and nut threads. The appropriate orthogonal array, signal to noise (S/N) ratio and analysis of variance (ANOVA) are employed to analyze the effect of the mentioned parameters on the rotation angle reduction. The optimized anti-loosening nut design result was obtained with 3.76% mass reduction, 12.85% self-loosening rotation angle reduction, 12.7% equivalent stress reduction which is compared with initial anti- loosening nut design. Using Taguchi method for the design of experiments (DOE), it is investigated the significant influence and the parameters interaction effect with minimum number of trials as compared with a full factorial design.
목차
- 목 차요 약 ⅰ목 차 ⅲList of Tabl ⅵList of Figures ⅷⅠ. 서 론 11.1 연구배경 11.2 풀림방지너트의 기술개발동향 31.3 연구목적 및 방법 5Ⅱ. 이론적 고찰 62.1 볼트-너트 풀림토크에 대한 이론적 증명 62.2 볼트강도등급에 의한 너트 체결력 102.3 최적설계 알고리즘 112.3.1 다구찌법의 개요 112.3.2 설계변수인자 선정 및 직교 좌표 배치 13Ⅲ. 볼트-너트 조인트의 풀림메커니즘 해석 143.1 너트의 풀림 메커니즘 유한요소해석 143.1.1 유한요소모델링 153.1.2 접촉조건 및 하중조건 173.2 유한요소해석 결과 20Ⅳ. 풀림방지너트 최적설계 294.1 풀림방지너트의 개념설계 294.2 풀림방지너트 상세설계 및 유한요소모델링324.2.1 풀림방지너트 설계 324.2.2 유한요소모델링 344.2.3 접촉조건 및 하중조건 354.3 유한요소해석 결과 364.4 다구찌법을 이용한 최적설계방안 454.4.1 실험계획법 및 설계인자 454.4.2 민감도 해석결과 494.4.3 최적설계 결과 59Ⅴ. 결 론 63참고문헌 65Abstract 67
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