机载设备安装架随机振动疲劳分析与结构优化  

Random Vibration Fatigue Analysis and Structure Optimization of Airborne Equipment Mounting Frame

作　　者：吴敬凯 向华平[2] 闫鹏飞[1] WU Jingkai;XIANG Huaping;YAN Pengfei(Nanjing Glarun Defense System Co.,Ltd.,Nanjing 210039,China;Nanjing Research Institute of Electronics Technology,Nanjing 210039,China)

机构地区：[1]南京国睿防务系统有限公司,江苏南京210039 [2]南京电子技术研究所,江苏南京210039

出　　处：《电子机械工程》2023年第2期23-26,31,共5页Electro-Mechanical Engineering

摘　　要：机载设备的结构设计要满足耐久随机振动下的疲劳寿命要求。通过仿真手段准确预测结构在服役过程中的薄弱区域并加以优化改进,可有效提高设计方案的首次成功率。文中基于频域疲劳分析法,结合Miner线性累积损伤理论和材料S-N曲线,对某安装架开展随机振动下的疲劳寿命分析,仿真得到的安装架疲劳寿命和失效位置与试验结果吻合较好。分析安装架疲劳失效机理并进行优化改进设计,结果表明改进后结构的振动疲劳寿命得到了显著提高。The structural design of airborne equipment should meet the fatigue life requirement under the durable random vibration.Thefirst-time success rate of projects can be improved effectively by predicting the weak area of the structure accurately and optimizing it through simulation.On the basis of the frequency domain fatigue analysis method,combined with Miner’s linear cumulative damage theory and the S-N curve of materials,the fatigue life of a mounting frame under random vibration is analyzed in this paper.The fatigue life and failure location of the mounting frame obtained by simulation are in good agreement with the test results.The fatigue failure mechanism of the mounting frame is analyzed and the optimization design is carried out.The results show that the vibration fatigue life of the optimized structure is improved significantly.

关 键 词：机载设备 随机振动 疲劳分析 结构优化 有限元法 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]