航空电子设备安装支架的刚度与频率优化设计

航空电子设备用于飞行中的数据采集，通常使用安装支架固定于机头雷达罩，研究安装支架的刚度和一阶频率性能，避免设备支架在飞行过程中出现塑性变形和共振现象，对提高飞行稳定性具有重要的工程意义。在惯性载荷下对安装支架进行静强度和模态分析，采用一种灵敏度分析方法确定安装支架的设计变量，以结构总质量最小为优化目标，在保证安装支架的刚度和一阶模态性能的前提下对支架各个构件的厚度进行优化设计，并对优化后的安装支架结构进行振动试验。结果表明：优化后的安装支架结构刚度基本保持不变，一阶频率提高了18.09%，质量减少了19.33%，改进设计满足设备安装要求。

Optimum Design of Stiffness and Frequency of Mounting Bracket Used in Aeronautical Electronic Equipment

Aeronautical electronic equipment is used for data collection during flight, usually fixed to the nose radome using mounting brackets, studying the stiffness and first-order frequency performance of the mounting brackets to avoid plastic deformation and resonance during flight, which is of great engineering significance for improving flight stability. The static strength and modal analysis of the mounting bracket under inertial load show that the bracket has good Bending stiffness, but the first order frequency is low. Using a sensitivity analysis method to determine the design variables of the installation bracket, with the goal of minimizing the total weight of the structure as the optimization objective, the thickness of each component of the bracket is optimized while ensuring the stiffness and first-order modal performance of the installation bracket. Vibration tests are conducted on the optimized installation bracket structure, and the test frequency values and finite element calculation values are in good agreement, verifying the accuracy of the finite element modal analysis method. The results show that the stiffness of the optimized installation bracket structure remains basically unchanged, with an increase of 18.09% in first-order frequency and a weight reduction of 19.33%. The improved design meets the equipment installation requirements.