小挠度碳纤维复合材料镜筒设计

Structure design of little distortion CFC lens barrel in space telescope

碳纤维复合材料目前广泛应用于航天结构高强度要求的场合,对复合材料满足小变形使用要求的刚度设计仍然是航天相机结构设计的难题。通过对共轴三反光学系统公差的分析,给出变形量小于2μm的复合材料的刚度设计要求。根据结构的受力状况建立了物理模型。结合复合材料层压板理论,对碳纤维铺层设计进行了合理的简化,并通过有限元分析软件M SC.N astran对设计进行了完善和验证。结果表明:设计的碳纤维复合材料镜筒满足了结构端面变形量小于2μm的刚度使用要求。

Carbon stiffness design wi fiber composite （CFC） is widely used in structure design of space systems. Its th little distortion is still a vital problem in the structure design of aerospace cameras. The design requirement of 2 μm maximum distortion for CFC was achieved by the tolerance analysis of mechanical parts in a coaxial 3R optical system of space telescope. The physical model was established according to the force distribution of the whole structure. The CFC layer sequence was reasonably simplified based on the paprag theory for composite materials. MSC. Nastran was used to improve and verify the design. The result of the Finite Element Analysis （FEA） shows that the design of the CFC lens barrel meets the requirement of structure stiffness with maximum distortion of less than 2 μm.