【摘要】：鐵電陶瓷材料在高能量光束的照射下能夠產(chǎn)生應(yīng)變,因此可制作成驅(qū)動器或傳感器層合于空間梁、板、殼結(jié)構(gòu)或者嵌入結(jié)構(gòu)內(nèi)部實現(xiàn)對結(jié)構(gòu)的形狀控制。相比于由電、磁等信號激發(fā)的智能材料制作而成的驅(qū)動器(如壓電驅(qū)動器、電致伸縮作動器、記憶合金等),光致伸縮驅(qū)動器由于具有不需要硬線連接、遠程控制而且不會引起電磁干擾等優(yōu)點,所以非常適合在太空環(huán)境下對結(jié)構(gòu)施加非接觸激勵以及控制,且符合航空航天領(lǐng)域輕質(zhì)化的發(fā)展趨勢,因此具有重大的研究價值。本文利用不同極化方向的光致伸縮驅(qū)動器,針對驅(qū)動器在多場耦合下的本構(gòu)模型、光致伸縮層合梁結(jié)構(gòu)力學(xué)建模以及光電層合機翼結(jié)構(gòu)的機翼撓度優(yōu)化問題開展研究。本文首先闡述了鐵電陶瓷材料和光致伸縮驅(qū)動器在光-電-力-熱等物理場下的耦合效應(yīng),分別針對不同極化方向的驅(qū)動器本構(gòu)關(guān)系進行分析,建立0-1極化和0-3極化驅(qū)動器層合梁結(jié)構(gòu)力學(xué)模型。采用光-電-力-熱耦合單元建立層合結(jié)構(gòu)的有限元模型,并引入加強假定應(yīng)變以及假定自然應(yīng)變模式來改善單元性能。解析方法與有限元方法和采用軟件Abaqus計算三種計算結(jié)果進行對比表明,建立的力學(xué)模型正確、有效,提出的光電單元效率更高,能更好的模擬驅(qū)動效果。針對Abaqus軟件進行二次開發(fā),編寫PLZT材料子程序,搭建軟件Abaqus和Matlab聯(lián)合仿真平臺,并在此基礎(chǔ)上以柔性機翼結(jié)構(gòu)的位移為目標函數(shù),以粘貼于機翼結(jié)構(gòu)表面的光致伸縮驅(qū)動器的位置和數(shù)目為設(shè)計變量,應(yīng)用有限元軟件和遺傳算法設(shè)計針對柔性結(jié)構(gòu)的位移優(yōu)化系統(tǒng)。數(shù)值模擬結(jié)果驗證了該優(yōu)化方法能很好的實現(xiàn)光電層合機翼結(jié)構(gòu)的位移優(yōu)化。
[Abstract]:Ferroelectric ceramic materials can produce strain under the irradiation of high energy beam, so they can be fabricated into actuators or sensors laminated in space beam, plate, shell structure or embedded structure to control the shape of the structure. Compared with the actuators made of intelligent materials excited by electrical, magnetic and other signals (such as piezoelectric actuators, electrostrictive actuators, memory alloys, etc.), the photostrictive actuators are very suitable for applying non-contact excitation and control to the structure in the space environment because they do not need hard wire connections, remote control and do not cause electromagnetic interference, and are in line with the development trend of lightweight in the aerospace field. Therefore, it has great research value. In this paper, the constitutive model of the actuator under multi-field coupling, the mechanical modeling of phototelescopic laminated beam structure and the optimization of wing deflection of optoelectronic laminated wing structure are studied by using phototelescopic actuators with different polarization directions. In this paper, the coupling effect of ferroelectric ceramic materials and photostrictive actuators in optical-electric-force-thermal and other physical fields is described. The constitutive relations of actuators in different polarization directions are analyzed, and the mechanical models of 0 鈮，

本文編號：2504039