本文關(guān)鍵詞：軟式飛艇囊體結(jié)構(gòu)彎皺特性分析　出處：《哈爾濱工業(yè)大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 軟式飛艇 彎皺特性 臨近空間熱環(huán)境 多尺度方法 變截面梁

【摘要】：軟式飛艇作為典型的充氣薄膜結(jié)構(gòu),在外載荷作用下容易發(fā)生失穩(wěn)現(xiàn)象,臨近空間熱環(huán)境復(fù)雜且晝夜變化較大,促進(jìn)飛艇熱場(chǎng)集中和褶皺產(chǎn)生,加速飛艇的破壞,開展軟式飛艇的褶皺特性研究具有重要的指導(dǎo)意義。針對(duì)三點(diǎn)彎曲充氣梁的彎皺特性,建立了多尺度分析模型,對(duì)其褶皺發(fā)生、擴(kuò)展規(guī)律和承載特性進(jìn)行了數(shù)值分析。考察了多尺度模型中不同的界面處理方式以及精細(xì)化區(qū)域選取對(duì)褶皺分析結(jié)果影響,得到了充氣梁的多尺度模型最優(yōu)建模方式。設(shè)計(jì)了充氣梁褶皺的三點(diǎn)彎曲實(shí)驗(yàn),獲取了充氣梁在三點(diǎn)彎曲載荷作用下的褶皺特性實(shí)驗(yàn)結(jié)果,與數(shù)值分析結(jié)果對(duì)比,驗(yàn)證了多尺度分析方法的準(zhǔn)確性和有效性。建立了三點(diǎn)彎曲充氣梁褶皺特性預(yù)報(bào)模型,預(yù)報(bào)了褶皺區(qū)域長度、褶皺角和抗彎剛度變化,確定了充氣梁三點(diǎn)彎曲載荷位移曲線,實(shí)驗(yàn)驗(yàn)證了預(yù)報(bào)模型的準(zhǔn)確性。建立了空間變截面梁傳遞矩陣推導(dǎo)方法,得到了變截面梁剛度矩陣;完成了非連續(xù)變截面單元?jiǎng)偠染仃囉?jì)算,明確了錐形變化梁傳遞矩陣和剛度矩陣表達(dá)形式,驗(yàn)證了該理論準(zhǔn)確性與高效性;建立了飛艇多尺度模型,完成了大變形非線性彎曲分析,獲得了飛艇起皺載荷與失效載荷。建立了臨近空間大氣溫度、太陽輻射、地球反照和紅外輻射模型,開展了飛艇瞬態(tài)與穩(wěn)態(tài)溫度場(chǎng)分析,闡明了飛艇的溫度場(chǎng)變化規(guī)律,分析了太陽能電池對(duì)飛艇熱特性影響。開展了臨近空間熱環(huán)境下飛艇褶皺特性研究,分析了臨近空間熱環(huán)境對(duì)飛艇褶皺特性的影響。
[Abstract]:As a typical inflatable membrane structure, soft airship is prone to instability under external load. The thermal environment is complex and the diurnal variation is large in the adjacent space, which promotes the thermal field concentration and fold generation of the airship. It is of great significance to accelerate the damage of airship and to study the fold characteristics of flexible airship. According to the bending characteristics of three-point curved inflatable beam, a multi-scale analysis model is established and the fold occurs. The effects of different interface processing methods and fine regions selection on the results of fold analysis were investigated. The multi-scale model of inflatable beam is obtained, the three-point bending experiment of inflatable beam is designed, and the experimental results of the folding characteristics of inflatable beam under three-point bending load are obtained. Compared with the numerical analysis results, the accuracy and validity of the multi-scale analysis method are verified. A prediction model for the fold characteristics of three-point curved inflatable beam is established to predict the variation of fold region length, fold angle and bending stiffness. The three-point bending load displacement curve of inflatable beam is determined and the accuracy of the prediction model is verified experimentally. The transfer matrix derivation method of spatial variable section beam is established and the stiffness matrix of variable section beam is obtained. The stiffness matrix of discontinuous variable section element is calculated, and the expression of transfer matrix and stiffness matrix of tapered variable beam is defined, which verifies the accuracy and efficiency of the theory. The multi-scale model of airship is established, the nonlinear bending analysis of large deformation is completed, the wrinkling load and failure load of airship are obtained, and the models of atmospheric temperature, solar radiation, earth reflection and infrared radiation are established. The transient and steady-state temperature field analysis of airship is carried out, the variation law of airship temperature field is clarified, the influence of solar energy cell on the thermal characteristics of airship is analyzed, and the fold characteristics of airship in near space thermal environment are studied. The influence of thermal environment in adjacent space on the fold characteristics of airship is analyzed.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V214;V274
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本文編號(hào)：1379935