星载薄壁结构天线结构优化设计与试验验证
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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.
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.
引文
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[6]张琪.基于有限元的薄壁结构建模及尺寸优化[J].强度与环境,2015,42(3):42-46.
[7]谭景磊,金海波.基于Patran的复杂薄壁结构有限元建模及细节分析方法研究[J].飞机设计,2013,33(3):15-20.
[8]马小飞,韦娟芳.星载天线基础结构特性对振动响应的影响分析[J].空间电子技术,2011,2:30-33.
[2]隋允康,杜家政,等,编.MSC.Nastran有限元动力分析与优化设计实用教程[M].北京:科学出版社,2004.
[3]毛佳,江振宇,陈广南.轴压薄壁加筋圆柱壳结构优化设计研究[J].工程力学,2011,28(8):183-192.
[4]袁家军,于登云,等,编.卫星结构设计与分析[M].北京:宇航出版社,2004.
[5]张卫红,章胜冬,高彤.薄壁结构的加筋布局优化设计[J].航空学报,2009,30(11):109-112.
[6]张琪.基于有限元的薄壁结构建模及尺寸优化[J].强度与环境,2015,42(3):42-46.
[7]谭景磊,金海波.基于Patran的复杂薄壁结构有限元建模及细节分析方法研究[J].飞机设计,2013,33(3):15-20.
[8]马小飞,韦娟芳.星载天线基础结构特性对振动响应的影响分析[J].空间电子技术,2011,2:30-33.