基于有限元的X射线聚焦望远镜结构分析

Analysis of X-ray focusing telescope structure based on finite element method

针对我国X射线时变与偏振卫星(XTP)项目中高能X射线聚焦望远镜的研制需求,初步设计了嵌套式、类Wolter-I型X射线望远镜并进行了结构优化。基于X射线望远镜的光学设计理论,给出了嵌套式聚焦望远镜的光学结构参数。利用有限元分析软件ABAQUS,建立了嵌套式X射线聚焦望远镜的有限元模型。采用基础激励法模拟了X射线聚焦望远镜模型的随机振动,得到了望远镜结构的应力分布。通过切换层的方式,降低了望远镜结构的应力,达到了多层膜承受应力的要求。该研究为XTP项目中的X射线望远镜载荷设计提供了参考。

For the X-ray timing and polarization(XTP)project in China,the optical structure of nested conical Wolter-I X-ray telescope was designed and optimized.Based on the theory of optical design of X-ray telescope,the optical parameters were calculated.By ABAQUS,the finite element model of nested telescope was established.The base-excitation method was used to carry out random vibration analysis.By switching layers,the stress of the telescope structure was reduced,which can meet the requirement of multilayers' stress.This research provides a support for the design of X-ray telescope in XTP project.