空间相机次镜调整机构的性能评价及参数优化

Performance evaluation and parameters optimization of space telescope secondary mirror adjusting mechanism

针对空间相机次镜调整机构的复杂设计约束要求,提出一组评价调整机构运行效率的指标体系,并基于这组指标评价体系,优化得到一组综合约束下效率性能较高的机构尺寸参数。通过建立机构的运动学模型、运动误差模型、静力学模型和动力学模型,针对运载过程和在轨运行期间的约束要求,提出了空间利用效率指标、误差传递效率指标、质量受力效率指标和运动能耗效率指标,基于四个效率性能评价指标,利用性能图谱法,分别得到了四个效率指标的性能图谱,并进一步优化得到了一组效率性能全面的机构尺寸参数(a,b,l)=(197 mm,643 mm,1260 mm),研究成果为后续该机构的空间工程应用奠定了良好的理论基础。

For meeting the requirement of complicated design restrictions,a set of performance indices was proposed,which was used to evaluate the efficiency of a space telescope secondary mirror adjusting mechanism.Based on these indices,a set of dimension parameters with high efficiency was obtained.By establishing the kinematic model,error model,statics model,dynamic model and analyzing the characters of these models,the Workspace Efficiency Index(WEI),Error Efficiency Index(EEI),Force Efficiency Index(FEI)and Energy Efficiency Index(EnEI)were proposed.The performance atlases method was used to investigate these indices.Four performance atlases of these indices were presented.Furthermore,a set of dimension parameters((a,b,l)=(197 mm,643 mm,1260 mm))with high efficiency was obtained by optimizing these indices.The research result is helpful for engineering applications of this mechanism.