论文部分内容阅读
背架结构是500m口径球面射电望远镜(FAST)反射面支承结构的重要组成部分,其成型精度、自重大小及加工难易程度对FAST工作性能、项目造价及建设工期有较大影响。通过对多种背架结构形式进行细致的分析及优化,得到各自最优的结构参数及构造形式,并选取其中两种(单层结构、单层弦支结构)进行单元足尺模型试验,通过试验考察背架实际加工效果及性能。试验结果表明:普通钢结构加工工艺无法满足FAST较高的成型精度要求,需采取加设檩条调节层的构造措施;实际模型工作精度及构件应力水平与有限元模型分析结果吻合,满足功能要求;综合比较两模型的制作安装过程及工作性能,认为单层背架具有结构简单、易于制作、结构精度易于控制等优点,为两试验模型中的较优者。
The structure of the back frame is an important part of the supporting structure of the 500m diameter spherical radio telescope (FAST) reflecting surface. Its forming precision, weight and ease of processing have a great impact on FAST performance, project cost and construction period. Through the careful analysis and optimization of many kinds of back frame structure forms, the optimal structural parameters and structure forms are obtained, and two kinds of single-layer structure and single-layer chord structure are selected for full-scale unit test. Test to examine the actual processing effect and performance of back frame. The experimental results show that the common steel structure processing technology can not meet the high forming accuracy requirements of FAST, and the construction measures of adding slender adjusting layer should be taken. The actual working accuracy and the stress level of components agree well with the results of finite element analysis to meet the functional requirements. Comprehensive comparison between the two models of production and installation process and performance, that the single-layer back frame has the advantages of simple structure, easy to manufacture, easy to control the structure accuracy, the better for the two test models.