复合材料力矩陀螺支架结构优化及仿真

COMPOSITE MOMENT GYROSCOPES BRACKET STRUCTURE OPTIMIZATION AND SIMULATION

为了提高力矩陀螺支架结构效率,以结构基频/质量比(ω/m)作为优化目标值,对力矩陀螺支架结构进行了动力学分析。利用有限元软件建模计算,得到复合材料制造的力矩陀螺支架质量为7.32 kg,基频为255.06 Hz,ω/m为34.83 Hz/kg。为了发挥复合材料的性能优势,对力矩陀螺支架通过几何结构进行优化设计。结果表明:本体厚度增加1 mm,ω/m降低4.2%;通过均布T型加强筋增强,ω/m可提高39.21%。基于T型加强筋增强结构,对复合材料铺层进行优化设计。结果表明:准各向同性铺层具有更高的结构效率,ω/m为48.49 Hz/kg;考虑复合材料整体成型工艺性,采用[-144/-72/0/+72/+144]ns结构适应性铺层设计得到的ω/m为47.79 Hz/kg。

To increase the structure efficiency of moment gyroscopes bracket,based on modal and mass ratio optimization,the dynamics model of moment gyroscopes bracket was analyzed.By calculating with FEM,the weight of composite moment gyroscopes bracket is 7.32 kg,the base frequency is 255.06 Hz,and theω/m is 34.83 Hz/kg.To increase the efficiency of composite,the geometry structure was optimized,the research shows that theω/m is improved by 4.2%when the thick of the base structure is increased by 1 mm.Theω/m is improved by 39.21%with the T strength stiff addition.Based on the T strength stiff structure,the composite lay designing was conducted,the research shows the efficiency of gyroscopes bracket structure is higher with quasi-isotropy lay design,which is 48.49 Hz/kg.Considering the processing of integral cure,theω/m is 47.79 Hz/kg with[-144/-72/0/+72/+144]ns lay design.