某型雷达反射板轻量化仿真设计

为满足某型雷达支架反射板的轻量化要求,使用碳纤维复合材料代替原有的1350铝合金材料.改进后的碳纤维材料反射板厚度由1.8 mm下降到1.4 mm,使结构重量减轻了50％.碳纤维材料相比于铝合金材料在强度刚度上都具有优势,但由于反射板厚度下降,无法判断其力学性能是否下降,需要进行理论计算及仿真论证.利用ANSYS软件对改进后的反射板进行模态分析、随机振动分析和瞬态动力学分析,并对其各阶固有频率进行了理论计算.结果 表明:2阶固有频率与2阶工作频率较为接近,应适当调整该阶工作频率,避免在固有频率附近工作.改进后的碳纤维反射板在振动载荷下安全系数提升9.473倍,冲击载荷下安全系数提升了3.269倍.研究结果为碳纤维材料替代传统金属材料提供了新的思路.

Research on Lightweight Design and Simulation of a Radar Reflector

Carbon fiber composite material is used instead of the original 1350 alloy material, in order to meet the lightweight requirement of a radar bracket reflector. The thickness of the modified carbon fiber reflector decreased from 1.8mm to 1.4mm, reducing the weight of the structure by 50%. Compared with aluminum alloy, carbon fiber material has advantages in strength and stiffness. However, due to the decrease of reflector thickness, it is impossible to judge whether the mechanical properties of carbon fiber material decrease. In order to prove the reliability of the scheme, theoretical calculation and simulation are needed. Modal analysis, random vibration analysis and transient dynamics analysis of the improved reflector are carried out with ANSYS software. The natural frequencies of the reflector are calculated. The results show that the second order natural frequency is close to the second order working frequency. The working frequency should be adjusted properly to avoid working near the natural frequency. The safety coefficient of the improved carbon fiber reflector is increased by 9.473 times under vibration load and 3.269 times under impact load. The research results provide a new idea for carbon fiber material to replace traditional metal material.