天线罩夹层结构分析与过渡区域设计研究

发布时间：2018-04-22 22:00

  本文选题：天线罩 + 泡沫夹层结构　； 参考：《南京航空航天大学》2014年硕士论文

【摘要】：天线罩作为雷达天线系统的重要组成部分具有较高的设计要求,不仅需要满足其使用电性能要求同时还要满足结构设计要求。在对于天线罩的设计过程中并没有一个既定的规范设计过程,本文从天线罩的结构型式设计、厚度优选、结构选材、力学性能分析以及连接过渡结构设计等几个方面逐步对天线罩进行了设计优化和性能研究。首先,为天线罩的夹层结构设计优化。在满足电性能要求的条件下确定结构的夹层型式和厚度范围,接着对夹层结构的芯层-蒙皮不同厚度比情况进行计算分析,得出最优的厚度比结构。再计算不同厚度比夹层形式的稳定性,按照平面应变问题建立有限元模型,得出稳定性较好结构中的最小厚度比,并综合电性能分析,得出最优厚度比。接着,为夹层结构天线罩设计和整体力学性能的分析。首先根据一般机载天线罩的外形设计要求,对天线罩的结构进行合理设计。根据有限元法进行工程分析的一般流程,通过划分网格、赋材料属性和单元属性、施加载荷约束和位移约束,建立复合材料天线罩有限元模型,并对其进行静力分析和屈曲分析,根据计算结果对天线罩的刚度、强度及稳定性进行校核。最后,为天线罩连接过渡区域的研究。首先对夹层结构连接过渡区域设计进行理论分析研究,确定过渡连接的形式和铺层形式,建立合理的有限元结构模型。再根据整体有限元计算的结果和天线罩约束连接形式定义过渡区域模型的边界条件,通过提出不同的过渡角设计对夹层结构进行优化设计,确定最优夹层结构过渡区域的最优过渡角。制作连接过渡区域试验试件,设计合理的试验条件,进行天线罩过渡区域试验研究,验证计算的正确性。
[Abstract]:As an important part of radar antenna system, radome has high design requirements, which not only needs to meet the requirements of electrical performance, but also to meet the requirements of structural design. There is no established standard design process in the design process of the radome. In this paper, the structure type design, thickness selection, structural material selection of the radome are introduced. The design optimization and performance research of the radome are carried out step by step in the aspects of mechanical performance analysis and connection transition structure design. Firstly, the sandwich structure of the radome is optimized. The sandwich type and thickness range of the structure are determined under the condition that the electrical performance is satisfied. Then the optimum thickness ratio structure is obtained by calculating and analyzing the different thickness ratio of the core layer to the skin of the sandwich structure. Then the stability of interlayer with different thickness ratio is calculated and the finite element model is established according to the plane strain problem. The minimum thickness ratio of the structure with good stability is obtained and the optimum thickness ratio is obtained by synthesizing the electrical performance analysis. Then, the design of the sandwich structure radome and the analysis of the overall mechanical properties are given. Firstly, according to the requirements of general airborne radome, the structure of radome is designed reasonably. According to the general process of engineering analysis by finite element method (FEM), the finite element model of composite radome is established by meshing, assigning material attribute and element attribute, imposing load constraint and displacement constraint. The stiffness, strength and stability of the radome are checked according to the results of static analysis and buckling analysis. Finally, the research on the transition region of the radome connection is given. Firstly, the design of transition zone of sandwich structure connection is studied theoretically, and the form of transition connection and layering form are determined, and a reasonable finite element structural model is established. Then the boundary conditions of the transition region model are defined according to the results of the whole finite element calculation and the constrained connection form of the radome, and the optimum design of the sandwich structure is carried out by proposing different transition angles. The optimal transition angle of the transition region of the optimal sandwich structure is determined. The connection transition zone test specimen is made, reasonable test conditions are designed, and the experimental research on the transition zone of the radome is carried out to verify the correctness of the calculation.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN957.2
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本文编号：1789104