某舰用雷达抗冲击仿真研究

A Study on Shock Resistance Simulation of Shipborne Radar

抗冲击设计是舰用雷达结构设计的重要组成部分。文中针对某舰用雷达抗冲击仿真分析问题,介绍了常用的舰用设备抗冲击数值仿真分析方法,剖析了主流方法在计算效率和适用场合上的不同之处,为仿真分析方法的选用提供依据,并建立了某舰用雷达有限元模型;针对不同仿真方法产生的抗冲击分析结果差异问题,分别使用动力学设计法(DDAM)和时域分析法进行抗冲击仿真分析,分析结果表明,两种仿真计算方法得到的结构应力分布趋势基本一致,得出的薄弱结构部位相同,DDAM计算效率更高,但由于DDAM算法本身的保守性,且没有考虑低频段密集模态问题,计算得到应力值结果偏大。因此舰用雷达抗冲击仿真推荐采用时域分析法。

The anti-impact design is an important part of the structural design of the shipborne radar.The commonly used numerical simulation methods in the impact resistance analysis are introduced,and the difference in efficiency and application scenarios among these methods is analyzed,providing a basis for the selection of simulation methods.A finite element model for a shipborne radar is created.To illustrate the difference in analysis results generated by different simulation methods,the dynamic design method(DDAM) and time-domain analysis method are applied to the analysis of impact resistance simulation separately,and the simulation results of the two methods are compared.The analysis results show that the stress distribution and the weak region of structure obtained by the two methods are basically the same with a higher calculation efficiency of DDAM.However,due to the conservative nature of the DDAM and overlooking of the dense low frequency band of the the modal problem,the calculated value of the stress becomes larger.So the time-domain analysis method is recommended to the analysis of impact resistance simulation for the shipborne radar.