本文選題：隨機(jī)振動(dòng) + 波導(dǎo)縫隙陣天線�。� 參考：《工程設(shè)計(jì)學(xué)報(bào)》2017年04期

【摘要】：波導(dǎo)縫隙陣天線具有結(jié)構(gòu)緊湊、質(zhì)量輕、性能好等優(yōu)點(diǎn),常被用于機(jī)載或彈載雷達(dá)等多種設(shè)備。隨機(jī)振動(dòng)是雷達(dá)工作時(shí)的主要載荷形式,振動(dòng)引起的天線變形會(huì)對天線增益產(chǎn)生一定影響。目前用傳統(tǒng)方法計(jì)算隨機(jī)振動(dòng)對天線增益影響的過程非常復(fù)雜,且計(jì)算量很大,為此提出一種利用位移響應(yīng)的均方根來計(jì)算隨機(jī)振動(dòng)對天線增益影響的等效方法。假設(shè)隨機(jī)振動(dòng)是滿足均值為零的正態(tài)分布的隨機(jī)過程,利用各個(gè)節(jié)點(diǎn)的完全相關(guān)性可生成多組樣本,首先利用傳統(tǒng)方法和等效方法分別計(jì)算得到隨機(jī)振動(dòng)下天線增益的均方根,然后利用泰勒展開式推導(dǎo)等效方法的適用條件,最后以寬邊波導(dǎo)縫隙陣天線為例,通過數(shù)值仿真和實(shí)驗(yàn)驗(yàn)證等效方法的有效性。研究表明:等效方法誤差小于0.1dB,該方法在滿足一定條件時(shí),能夠快速計(jì)算隨機(jī)振動(dòng)對天線增益的影響。該等效算法可大大提高計(jì)算效率、節(jié)約計(jì)算時(shí)間,同時(shí)計(jì)算結(jié)果具有重要工程意義,為天線設(shè)計(jì)人員提供參考。
[Abstract]:Waveguide slot array antenna has many advantages, such as compact structure, light weight, good performance and so on. It is often used in many kinds of equipments such as airborne or missile borne radar. Random vibration is the main form of radar load, and antenna deformation caused by vibration will affect antenna gain to some extent. At present, the traditional method for calculating the effect of random vibration on antenna gain is very complicated, and the calculation is very heavy. Therefore, an equivalent method is proposed to calculate the effect of random vibration on antenna gain by using the root-mean-square root of displacement response. Assuming that random vibration is a random process satisfying normal distribution with zero mean value, multiple groups of samples can be generated by using the complete correlation of each node. Firstly, the root mean square (RMS) of antenna gain under random vibration is calculated by traditional method and equivalent method, respectively. Then the suitable conditions of the equivalent method are derived by using the Taylor expansion. Finally, the effectiveness of the equivalent method is verified by numerical simulation and experiments, taking the wide-side waveguide slot array antenna as an example. The results show that the error of the equivalent method is less than 0.1 dB, and the effect of random vibration on antenna gain can be calculated quickly when the method satisfies certain conditions. The equivalent algorithm can greatly improve the calculation efficiency and save calculation time. The calculation results are of great engineering significance and provide reference for antenna designers.
【作者單位】： 電子科技大學(xué)機(jī)械電子工程學(xué)院;中國西南電子技術(shù)研究所;
【基金】：國防科工局預(yù)研項(xiàng)目(0D2014061300014)
【分類號】：TN823.24

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