摘要
针对某航天用小型杜瓦支撑结构的高强度和低漏热要求,采用了具有超高强度同时具有超低热导率且密度小的凯夫拉纤维作为支撑材料,对其合股纤维进行了力学拉伸实验,在此基础上,对所设计的支撑结构建立了计算模型。采用Ansys软件对支撑结构进行了模态、谐响应和随机振动的分析,结果表明,结构的最低固有频率为248.5 Hz,在低频简谐激励下位移可忽略不计,在随机载荷下3-σ最大应力值小于材料的强度极限,支撑结构性能优异。
For the requirement of high strength and low heat leak of some space Dewar,kevlar fiber which has high strength,low thermal conductivity and low density was used as the support material. The tensile experiment of the fiber was done. On this basis,the calculation model of the structure was built. The software Ansys was used to make the simulation of modal,harmonic response and random vibration. The results show that the minimum natural frequency of the structure is 248. 5 Hz. The displacement of the structure in harmonic excitation could be ignored and the 3-σ maximum stress in random load is lower than the strength limit of the material.
作者
王国鹏
李学良
洪国同
Wang Guopeng;Li Xueliang;Hong Guotong(Technical institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China)
出处
《低温工程》
CAS
CSCD
北大核心
2018年第4期63-67,共5页
Cryogenics
关键词
凯夫拉
支撑结构
低温系统
仿真计算
Kevlar fiber
support structure
cryogenic system
simulation computation
