中国空间科学技术Issue(4)：30-36,7.DOI:10.3780/j.issn.1000-758X.2015.04.005
卫星桁架结构跨尺度热-力耦合优化设计与分析
Thermal-mechanical Optimizing Analysis on Multi-scale Numerical Model for Composite Structure of Satellite
摘要
Abstract
When spacecraft works ,it will suffer different temperature environments ,while temperature difference will always introduce changes of shape and size of composite structures . However ,some spacecraft parts need high dimensional stability to keep its right function . Till now , the mechanical properties of the composite have been widely studied , however , the thermal properties of composite and optimization of composite considering both thermal and mechanical properties are far from well studied . Composite tubes were optimized to a given coefficient of thermal expansion (CTE) , and the stiffness of those tubes was taken into consideration at the same time . Firstly , multi‐scale numerical models were developed to calculate the CTE . In micro‐scale mode , the CTE of unidirectional fiber reinforced composite was calculated by the fiber CTE through representative volume elements (RVE ) . In macro‐scale , a composite tube model was generated to predict both axial and transverse CTE of the tube based on the CTE computed by RVE . Composite laminates and tubes with given plies were analyzed and tested .Comparison between the predicted results and the experimental one verified the model , w hich made the foundation for the optimization mode . Secondly , optimization models for composite truss structure were created .The conjugate gradient method was adopted to optimize the plies of composite parts , and the thermal‐mechanical optimizing method was developed . Finally , the satellite support truss structure was analyzed by the thermal‐mechanical optimizing method . Analyzed results show that this optimized support structure and the whole antenna have an excellent thermal dimensional stability . The thermal‐mechanical optimizing method can be used for thermal stability design and analysis of composite support truss structures .关键词
桁架结构/跨尺度/优化设计/热稳定性/代表性体积单元/热膨胀系数/卫星Key words
Truss/Multi-scale/Optimizing design/Thermal stability/Representative volume element/Coefficient of thermal expansion/Satellite引用本文复制引用
马健,张宏宇,闫亮,冉治国..卫星桁架结构跨尺度热-力耦合优化设计与分析[J].中国空间科学技术,2015,(4):30-36,7.基金项目
国家重大科技专项工程资助项目 （）
