本文選題：天線罩 + 泡沫夾層結(jié)構(gòu)　； 參考：《南京航空航天大學(xué)》2014年碩士論文

【摘要】：天線罩作為雷達(dá)天線系統(tǒng)的重要組成部分具有較高的設(shè)計(jì)要求,不僅需要滿足其使用電性能要求同時(shí)還要滿足結(jié)構(gòu)設(shè)計(jì)要求。在對(duì)于天線罩的設(shè)計(jì)過程中并沒有一個(gè)既定的規(guī)范設(shè)計(jì)過程,本文從天線罩的結(jié)構(gòu)型式設(shè)計(jì)、厚度優(yōu)選、結(jié)構(gòu)選材、力學(xué)性能分析以及連接過渡結(jié)構(gòu)設(shè)計(jì)等幾個(gè)方面逐步對(duì)天線罩進(jìn)行了設(shè)計(jì)優(yōu)化和性能研究。首先,為天線罩的夾層結(jié)構(gòu)設(shè)計(jì)優(yōu)化。在滿足電性能要求的條件下確定結(jié)構(gòu)的夾層型式和厚度范圍,接著對(duì)夾層結(jié)構(gòu)的芯層-蒙皮不同厚度比情況進(jìn)行計(jì)算分析,得出最優(yōu)的厚度比結(jié)構(gòu)。再計(jì)算不同厚度比夾層形式的穩(wěn)定性,按照平面應(yīng)變問題建立有限元模型,得出穩(wěn)定性較好結(jié)構(gòu)中的最小厚度比,并綜合電性能分析,得出最優(yōu)厚度比。接著,為夾層結(jié)構(gòu)天線罩設(shè)計(jì)和整體力學(xué)性能的分析。首先根據(jù)一般機(jī)載天線罩的外形設(shè)計(jì)要求,對(duì)天線罩的結(jié)構(gòu)進(jìn)行合理設(shè)計(jì)。根據(jù)有限元法進(jìn)行工程分析的一般流程,通過劃分網(wǎng)格、賦材料屬性和單元屬性、施加載荷約束和位移約束,建立復(fù)合材料天線罩有限元模型,并對(duì)其進(jìn)行靜力分析和屈曲分析,根據(jù)計(jì)算結(jié)果對(duì)天線罩的剛度、強(qiáng)度及穩(wěn)定性進(jìn)行校核。最后,為天線罩連接過渡區(qū)域的研究。首先對(duì)夾層結(jié)構(gòu)連接過渡區(qū)域設(shè)計(jì)進(jìn)行理論分析研究,確定過渡連接的形式和鋪層形式,建立合理的有限元結(jié)構(gòu)模型。再根據(jù)整體有限元計(jì)算的結(jié)果和天線罩約束連接形式定義過渡區(qū)域模型的邊界條件,通過提出不同的過渡角設(shè)計(jì)對(duì)夾層結(jié)構(gòu)進(jìn)行優(yōu)化設(shè)計(jì),確定最優(yōu)夾層結(jié)構(gòu)過渡區(qū)域的最優(yōu)過渡角。制作連接過渡區(qū)域試驗(yàn)試件,設(shè)計(jì)合理的試驗(yàn)條件,進(jìn)行天線罩過渡區(qū)域試驗(yàn)研究,驗(yàn)證計(jì)算的正確性。
[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.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN957.2
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本文編號(hào)：1789104