| 摘要: |
| 为了研究随机振动载荷下某型机载雷达关键部位连接螺栓的疲劳特性，采用有限元仿真与理论公式相结合的方法对两款螺栓在振动疲劳载荷下的安全系数进行了评估，通过有限元仿真分析提取预紧力作用下螺栓随机振动受力情况，基于最小应力法计算不同型号预紧螺栓疲劳安全系数。研究结果表明螺栓载荷主要受到该方向振动激励下结构主振型的影响，且结构重心的偏心会显著加剧螺栓载荷。研究结果可以为连接螺栓选型及结构整体抗疲劳安全性设计提供参考。 |
| 关键词: 螺栓力 随机振动 振动疲劳 功率谱密度 |
| DOI：DOI:10.3969/j.issn.1672-2337.2024.02.013 |
| 分类号:TN957.8 |
| 基金项目: |
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| Random Vibration Fatigue Analysis for Connecting Bolts of an Airborne Radar |
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YUAN Hanqin, ZHAO Meng
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Military Representative Office of the Naval Equipment Department in Hefei Area, Hefei 230088, China
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| Abstract: |
| In order to study the fatigue characteristics of the connecting bolts at key parts of an airborne radar under random vibration loadings, a method combining finite element analysis and empirical formulas has been employed to evaluate the safety factors of two kinds of connecting bolts. The stress situation of the bolts considering preload under random vibration is extracted by simulation, and the fatigue safety factors are calculated by the minimum stress method. The results show that the bolt load is mainly affected by the main vibration mode of the structure under the vibration excitation in this direction. Besides, the eccentricity of the structure’s center of gravity will significantly intensify the bolt load. The research results can provide reference for the selection of connecting bolts and the overall fatigue resistance and safety design of the structure. |
| Key words: bolt force random vibration vibration fatigue power spectral density |
