某机载功放电子设备安装架结构优化设计

Optimization Design of Mounting Frame in Airborne Power Amplifiers Electronic Equipment

性能优良的安装架可以减少机载设备在工作中承受的机械振动,是机载设备正常工作的保障。针对安装架上减振器安装孔位置附近发生疲劳破坏的问题,通过采用尺寸优化、改变结构材料及更改安装沉孔结构的方式,对安装架提出4种优化设计方案。利用ANSYS软件对4种设计方案进行疲劳强度仿真分析,比较各方案等效应力和疲劳安全系数的大小,选取最优方案。分析表明,采用结构优化方案3时,减振器安装位置底部圆角上的疲劳安全系数最大,与相同材料的尺寸优化设计方案相比其最大等效应力也小很多。故采用结构优化方案3较为理想,设计也较为合理。为安装架的优化设计提供理论依据。

In order to reduce the mechanical vibration of airborne equipment,excellent performance of the mounting frame can ensure normal work security of the equipment. For the problem of fatigue failure near the shock absorber mounting hole of the mounting frame,it puts forward four kinds of optimized design solutions by size optimization,changing the material and redesigning the structure. In ANSYS software,fatigue strength simulation analysis of the four optimized design solutions is carried out,by comparison of various programs,such as equivalent stress and fatigue safety factor,and the optimal solution is selected. The analysis indicates,when uses structure optimization programme 3,the fatigue safety factor of the base fillet for installation shock absorber is the largest,and the maximum equivalent force is much smaller,so the programme 3 is most reasonable. Research results provide a theoretical basis for the optimization design o f mounting frame.