基于表观拉压模量与剪切模量差异的空间反射镜支撑

发布时间：2018-04-04 16:11

本文选题：空间反射镜组件　切入点：表观拉压模量　出处：《航天返回与遥感》2016年01期

【摘要】：随着航天遥感技术的发展,航天相机分辨率越来越高,空间反射镜的口径也越来越大。基于"钛合金+微晶玻璃"材料体系的托框支撑空间反射镜组件结构,当反射镜口径增大到超过500mm时,由于钛合金与微晶玻璃的线膨胀系数差异较大,温度变化时,由于膨胀变形不匹配所导致的反射镜面形恶化变得不可忽视。在反射镜组件中,钛合金镜框与微晶玻璃反射镜之间的连接是通过胶斑实现的,而胶斑的表观剪切模量仅为表观拉压模量的1/30左右。文章通过空间布局,利用胶斑的表观拉压模量进行反射镜的支撑,利用胶斑的表观剪切模量进行膨胀失配的卸载,解决了托框支撑反射镜组件在口径500mm~1 000mm范围内温度变化对面形的影响问题,扩展了托框支撑反射镜组件的应用口径范围。
[Abstract]:With the development of space remote sensing technology, the resolution of space camera becomes higher and higher, and the aperture of space mirror becomes larger and larger.Based on the supporting frame of titanium alloy glass-ceramics system, when the mirror diameter is larger than 500mm, because of the difference of linear expansion coefficient between titanium alloy and glass-ceramics, the temperature changes.The deterioration of the reflection mirror caused by the mismatch of expansion deformation can not be ignored.In the mirror assembly, the connection between titanium alloy frame and glass-ceramics mirror is realized by glue spot, and the apparent shear modulus of the speckle is only about 1 / 30 of the apparent tensile compression modulus.In this paper, through the space layout, the mirror is supported by the apparent tensile and compression modulus of the glue spot, and the expansion mismatch is unloaded by the apparent shear modulus of the spot.The influence of the temperature change on the surface shape in the aperture 500mm~1 000mm range is solved, and the aperture range of the bracket supporting mirror assembly is extended.
【作者单位】：北京空间机电研究所;
【基金】：国家重大科技专项工程
【分类号】：V443.5

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