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簡介：分類號(hào)學(xué)號(hào)M201072787學(xué)校代碼10487密級(jí)碩士學(xué)位論文航空飛行仿真器伺服控制系統(tǒng)研究學(xué)位申請人朱祥路學(xué)科專業(yè)光學(xué)工程指導(dǎo)教師楊振剛講師答辯日期2012120獨(dú)創(chuàng)性聲明本人聲明所呈交的學(xué)位論文是我個(gè)人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作及取得的研究成果。盡我所知，除文中已經(jīng)標(biāo)明引用的內(nèi)容外，本論文不包含任何其他個(gè)人或集體已經(jīng)發(fā)表或撰寫過的研究成果。對本文的研究做出貢獻(xiàn)的個(gè)人和集體，均已在文中以明確方式標(biāo)明。本人完全意識(shí)到本聲明的法律結(jié)果由本人承擔(dān)。學(xué)位論文作者簽名日期年月日學(xué)位論文版權(quán)使用授權(quán)書本學(xué)位論文作者完全了解學(xué)校有關(guān)保留、使用學(xué)位論文的規(guī)定，即學(xué)校有權(quán)保留并向國家有關(guān)部門或機(jī)構(gòu)送交論文的復(fù)印件和電子版，允許論文被查閱和借閱。本人授權(quán)華中科技大學(xué)可以將本學(xué)位論文的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫進(jìn)行檢索，可以采用影印、縮印或掃描等復(fù)制手段保存和匯編本學(xué)位論文。保密□，在年解密后適用本授權(quán)書。不保密□。（請?jiān)谝陨戏娇騼?nèi)打“√”）學(xué)位論文作者簽名指導(dǎo)教師簽名日期年月日日期年月本論文屬于

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簡介：碩士學(xué)位論文基于改進(jìn)代理模型航天器結(jié)構(gòu)基于改進(jìn)代理模型航天器結(jié)構(gòu)可靠性可靠性優(yōu)化設(shè)計(jì)優(yōu)化設(shè)計(jì)RELIABILITYBASEDDESIGNOPTIMIZATIONOFSPACECRAFTSTRUCTUREBASEDONIMPROVEDSURROGATEMODEL作者姓名鞏萃穎學(xué)科、專業(yè)工程力學(xué)學(xué)號(hào)21403027指導(dǎo)教師李剛教授完成日期2017年6月大連理工大學(xué)DALIANUNIVERSITYOFTECHNOLOGY大連理工大學(xué)碩士學(xué)位論文I摘要加筋柱殼結(jié)構(gòu)和格柵結(jié)構(gòu)是航空航天領(lǐng)域中常見的結(jié)構(gòu)形式，常常應(yīng)用于大型運(yùn)載火箭的級(jí)間段、整流罩和燃料貯箱等部段。減重任務(wù)對于飛行器的設(shè)計(jì)尤為重要，另外，飛行器在載荷環(huán)境、計(jì)算模型簡化、幾何制造公差、材料性能等方面均存在不確定性，基于可靠度的優(yōu)化可以盡可能地考慮這些不確定性，獲得兼?zhèn)浣?jīng)濟(jì)和安全的最優(yōu)方案。本文面向加筋柱殼和格柵等航天器結(jié)構(gòu)，建立了一個(gè)高效穩(wěn)定的基于改進(jìn)精度代理模型的可靠性優(yōu)化框架。它以結(jié)構(gòu)減重為目標(biāo)，考慮結(jié)構(gòu)在幾何制造公差、材料性能和載荷分布方面的隨機(jī)性，主要考慮軸力、彎矩、剪力和側(cè)向外壓工況下結(jié)構(gòu)屈曲失穩(wěn)的失效模式，對結(jié)構(gòu)的幾何尺寸和筋條數(shù)目進(jìn)行優(yōu)化設(shè)計(jì)。該優(yōu)化框架的主要內(nèi)容是，首先，按照靈敏度分析確定代理模型參變量、選擇代理模型類型、擴(kuò)大訓(xùn)練樣本集的設(shè)計(jì)空間、全局搜索優(yōu)化參數(shù)、放松局部設(shè)計(jì)域的精度要求的步驟建立改進(jìn)代理模型，獲取復(fù)雜載荷信息的統(tǒng)計(jì)規(guī)律以后，將載荷分布當(dāng)量正態(tài)化，然后，內(nèi)層采用自適應(yīng)混沌控制的改進(jìn)均值法獲取可靠度信息，傳遞到外層全局尋優(yōu)的演化算法進(jìn)行可靠度優(yōu)化，得到最優(yōu)方案后，重新在最優(yōu)點(diǎn)附近建立一個(gè)更高精度的局部代理模型，使用MONTECARLO方法對最優(yōu)方案的失效概率進(jìn)行驗(yàn)證。然后，本文使用該優(yōu)化框架實(shí)現(xiàn)了對航天飛行器中兩個(gè)典型構(gòu)型金屬正置正交加筋柱殼結(jié)構(gòu)和復(fù)合材料KAGOME格柵柱殼及錐殼結(jié)構(gòu)的可靠性優(yōu)化工作，驗(yàn)證了該優(yōu)化框架解決工程結(jié)構(gòu)可靠性優(yōu)化設(shè)計(jì)問題的有效性及高效性，并探索得出通過改變幾何尺寸提高這兩類結(jié)構(gòu)承載效率和安全可靠性的普適性規(guī)律。另外，本文還提出兩種在可靠性優(yōu)化設(shè)計(jì)中考慮載荷隨機(jī)性的方式一種是按照載荷的真實(shí)分布把載荷允許值作為隨機(jī)變量帶入功能函數(shù)，另外一種是將載荷均值項(xiàng)與標(biāo)準(zhǔn)差項(xiàng)線性相加后作為一個(gè)確定值帶入功能函數(shù)。在本文的優(yōu)化框架下，這兩種方法均能在保證結(jié)構(gòu)安全可靠度要求的同時(shí)，獲得減重效果最好的方案，且效果均優(yōu)于基于15安全系數(shù)法的確定性優(yōu)化效果。關(guān)鍵詞加筋柱殼；KAGOME格柵；可靠性；優(yōu)化設(shè)計(jì)；代理模型

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