星载薄壁结构天线结构优化设计与试验验证  

Structure Optimization Design and Experimental Verification of a Space-borne Antenna with Thin-walled Structure

作　　者：杨俊良 艾永强[1] 钟亦阳 YANG Junliang;AI Yongqiang;ZHONG Yiyang(China Academy of Space Technology(Xi'an),Xi'an710000,China)

机构地区：[1]中国空间技术研究院西安分院

出　　处：《空间电子技术》2019年第3期7-14,共8页Space Electronic Technology

基　　金：国家自然科学基金资助项目(11772252)

摘　　要：薄壁结构具有质量轻、电性能稳定等优点,但同时又由于其结构刚度低、承力能力差、同等力学环境下加速度响应大等缺点,制约着其在星载天线领域的应用。文章针对卫星薄壁结构天线的上述缺点,利用通用有限元分析软件MSC. Patran/Nastran建立力学分析模型,计算得到影响薄壁结构天线基频低、承受应力大的薄弱位置。进行结构优化时,突破传统的等截面加强筋设计方式,在该薄弱位置增加变截面加强筋,提高了结构基频;在加强筋之间设计倒角,降低了结构应力水平。优化后的分析结果表明,天线结构的基频提高了106%,同等力学环境下加速度响应降低了94%,应力水平减少了93%,满足天线设计指标要求。最后,通过试验验证了该优化方法的有效性,对以后薄壁结构天线的设计具有一定的指导意义。The thin-walled structure has stable electrical performance and light weight. However,the low fundamental frequency and low load carrying capacity of this kind of structure restrict its application in space-borne antenna field. By building finite element model in MSC. Patran/Nastran software,this article analyzed a space-borne antenna with thin walled structure and found weak spots of the structure. Against its weak spots,we optimized the antenna without by setting uniform beam but by setting variable cross-section stiffeners and rounding the corner between stiffeners. After the optimization,the stiffness of the antenna thin-walled structure was increased by 106%,the stress and acceleration response of which were reduced by 93% and 94% respectively in the same mechanical environment. The results improve the endurance of antenna in mechanical environment and satisfy the design requirements. The effectiveness of optimization design is verified by experiment. This method has certain guiding significance for future design of antenna with thin-walled structure.

关 键 词：薄壁结构 结构优化 有限元分析 加强筋 基频 应力水平 试验验证 

分 类 号：V443.4[航空宇航科学与技术—飞行器设计]