本文選題：雙穩(wěn)態(tài)結(jié)構(gòu)　切入點(diǎn)：預(yù)應(yīng)力　出處：《哈爾濱工業(yè)大學(xué)》2017年碩士論文

【摘要】：多穩(wěn)態(tài)結(jié)構(gòu)是一種單一結(jié)構(gòu)具備多種穩(wěn)定構(gòu)型的新型可變形結(jié)構(gòu),在每種穩(wěn)定構(gòu)型下不需要持續(xù)的能量輸入,并且具有一定的承載能力。多穩(wěn)態(tài)結(jié)構(gòu)可以在較小的能量輸入下實(shí)現(xiàn)從一種穩(wěn)定構(gòu)型屈曲跳變到另一種穩(wěn)定構(gòu)型,其可變形特點(diǎn)以及在穩(wěn)態(tài)構(gòu)型轉(zhuǎn)變過程展現(xiàn)出的變剛度特性,在變體結(jié)構(gòu)設(shè)計(jì)方面具有非常好的應(yīng)用前景。目前,多穩(wěn)態(tài)結(jié)構(gòu)的研究多集中在雙穩(wěn)態(tài)復(fù)合材料層板和預(yù)應(yīng)力雙穩(wěn)態(tài)金屬殼,對(duì)于預(yù)應(yīng)力方法制備雙穩(wěn)態(tài)薄膜層合殼關(guān)注較少。雙穩(wěn)態(tài)薄膜層合殼質(zhì)輕柔軟,結(jié)構(gòu)剛度小,相對(duì)于雙穩(wěn)態(tài)金屬殼實(shí)現(xiàn)跳變需要更少的能量輸入,并且克服了雙穩(wěn)態(tài)復(fù)合材料層板的尺寸效應(yīng),在小型化、微型化雙穩(wěn)態(tài)結(jié)構(gòu)設(shè)計(jì)方面具有顯著優(yōu)勢。本文從實(shí)驗(yàn)制備、力學(xué)性能分析以及雙穩(wěn)態(tài)結(jié)構(gòu)應(yīng)用設(shè)計(jì)等方面對(duì)預(yù)應(yīng)力雙穩(wěn)態(tài)薄膜層合殼展開研究。本文針對(duì)預(yù)應(yīng)力方法制備雙穩(wěn)態(tài)薄膜層合殼進(jìn)行了實(shí)驗(yàn)方案設(shè)計(jì),為滿足雙穩(wěn)態(tài)薄膜層合殼實(shí)驗(yàn)制備需求,設(shè)計(jì)了位移加載雙軸拉伸裝置,并對(duì)薄膜層間粘結(jié)劑進(jìn)行了篩選。本文制備了多種規(guī)格反對(duì)稱雙穩(wěn)態(tài)薄膜層合殼,對(duì)層合殼兩種穩(wěn)定狀態(tài)下構(gòu)型曲率以及中心加載跳變臨界載荷分別進(jìn)行了測試,并對(duì)雙穩(wěn)態(tài)薄膜層合殼的基本力學(xué)性能進(jìn)行了分析。針對(duì)規(guī)則拉伸與不規(guī)則拉伸兩種情況,對(duì)反對(duì)稱雙穩(wěn)態(tài)薄膜層合殼的結(jié)構(gòu)構(gòu)型進(jìn)行了實(shí)驗(yàn)分析,考察了預(yù)拉伸量、層合殼尺寸(長寬比、中間夾層)等因素對(duì)層合殼構(gòu)型的影響,發(fā)現(xiàn)預(yù)拉伸量增加,層合殼構(gòu)型曲率隨之正比例增長,層合殼尺寸對(duì)層合殼構(gòu)型影響較小。對(duì)規(guī)則拉伸層合殼構(gòu)型建立了理論預(yù)報(bào)模型,并利用有限元方法對(duì)其進(jìn)行了計(jì)算,將計(jì)算結(jié)果與實(shí)驗(yàn)結(jié)果進(jìn)行了比對(duì)分析,誤差在7%以內(nèi)。最后,本文依據(jù)雙穩(wěn)態(tài)柔性薄膜層合殼結(jié)構(gòu)的特點(diǎn)進(jìn)行應(yīng)用設(shè)計(jì),將雙穩(wěn)態(tài)薄膜層合殼結(jié)構(gòu)與微帶陣列天線相結(jié)合,進(jìn)行了雙穩(wěn)態(tài)可重構(gòu)天線設(shè)計(jì)。借助電磁仿真軟件對(duì)雙穩(wěn)態(tài)可重構(gòu)微帶天線兩種穩(wěn)定狀態(tài)下天線方向圖和工作頻率進(jìn)行了計(jì)算,考察了卷曲狀態(tài)時(shí)構(gòu)型曲率半徑對(duì)天線方向圖的影響;并利用絲網(wǎng)印刷工藝對(duì)雙穩(wěn)態(tài)可重構(gòu)天線進(jìn)行制備,對(duì)天線性能進(jìn)行了實(shí)驗(yàn)測試,驗(yàn)證了設(shè)計(jì)可行性。
[Abstract]:Multi-stable structure is a new type of deformable structure with multiple stable configurations, which does not require sustained energy input under each stable configuration, and has a certain bearing capacity.The multi-steady structure can change from one stable configuration buckling to another stable configuration with small energy input. The deformable characteristics and the variable stiffness characteristics of the steady state configuration transition process can be obtained.It has a very good application prospect in variant structure design.At present, the research of multistable structures is mainly focused on bistable composite laminates and prestressing bistable metal shells, and less attention is paid to the preparation of bistable thin film laminated shells by prestressing method.The bistable thin film laminated shell is light and soft, and its structure stiffness is small. Compared with bistable metal shell, it requires less energy input to realize jump, and it overcomes the size effect of bistable composite laminates and is miniaturized.Miniaturized bistable structure design has significant advantages.In this paper, the prestressing bistable thin film laminated shell is studied from the aspects of experimental preparation, mechanical properties analysis and bistable structure application design.In this paper, the experimental scheme of preparing bistable thin film laminated shell by prestressing method is designed. In order to meet the requirement of experimental preparation of bistable thin film laminated shell, a biaxial tension device with displacement loading is designed, and the binder between film layers is screened.In this paper, a variety of antisymmetric bistable thin film laminated shells are prepared. The curvature of the configuration and the critical load of the central loading jump are measured in two stable states of the laminated shells.The basic mechanical properties of bistable thin film laminated shells are analyzed.In this paper, the configuration of antisymmetric bistable film laminated shell is experimentally analyzed in the case of regular drawing and irregular drawing. The amount of pretension, the dimension of laminated shell (ratio of length to width, ratio of length to width) are investigated.It is found that the curvature of the laminated shell increases in proportion with the increase of pretension and the size of the laminated shell has little effect on the configuration of the laminated shell.The theoretical prediction model of regular tensile laminated shell is established, and the finite element method is used to calculate it. The calculated results are compared with the experimental results, and the error is less than 7%.Finally, according to the characteristics of bistable flexible thin film laminated shell structure, the bistable film laminated shell structure and microstrip array antenna are combined to design the bistable reconfigurable antenna.The antenna pattern and working frequency of bistable reconfigurable microstrip antenna in two stable states are calculated by electromagnetic simulation software. The influence of curvature radius of configuration on antenna pattern is investigated.The bistable reconfigurable antenna was fabricated by screen printing technology. The performance of the antenna was tested experimentally and the feasibility of the design was verified.
【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】：2017
【分類號(hào)】：TB383.2
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本文編號(hào)：1699060