本文關(guān)鍵詞：濕熱環(huán)境下旋轉(zhuǎn)復(fù)合材料薄壁梁振動(dòng)特性研究　出處：《西南交通大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 濕熱環(huán)境 旋轉(zhuǎn) 傾角 復(fù)合材料薄壁梁 Hamilton原理 Galerkin法 振動(dòng)特性

【摘要】：復(fù)合材料薄壁梁具有質(zhì)量輕、耐高溫、強(qiáng)度高等優(yōu)點(diǎn),在工程上應(yīng)用極廣,如直升機(jī)旋翼、風(fēng)力機(jī)葉片、操作機(jī)械臂等。復(fù)合材料的各向異性可使梁的不同彈性變形發(fā)生耦合,旋轉(zhuǎn)、傾角、濕熱等其他因素的作用,更加劇了復(fù)合材料薄壁梁動(dòng)力學(xué)行為的復(fù)雜性,相應(yīng)地對其振動(dòng)特性的研究不但具有重要的理論意義,也具有相當(dāng)?shù)膶?shí)用價(jià)值。本文的主要工作是研究了濕熱、旋轉(zhuǎn)、傾角等外部因素對復(fù)合材料薄壁梁拉伸、扭轉(zhuǎn)、彎曲耦合振動(dòng)的影響,分別為：(1)第1章介紹了本文工作的研究背景和意義,以及復(fù)合材料薄壁結(jié)構(gòu)、旋轉(zhuǎn)復(fù)合材料結(jié)構(gòu)及濕熱環(huán)境下復(fù)合材料結(jié)構(gòu)在國內(nèi)外的研究現(xiàn)狀,并簡要說明了本文的研究內(nèi)容。(2)第2章建立了復(fù)合材料薄壁梁模型,基于經(jīng)典殼體理論、濕熱環(huán)境下單層復(fù)合材料本構(gòu)關(guān)系和Hamilton原理推導(dǎo)了濕熱環(huán)境下復(fù)合材料薄壁梁的耦合振動(dòng)控制方程,分別討論了周向均勻剛度配置(CUS)和周向反對稱剛度配置(CAS)兩種構(gòu)型梁的振動(dòng)耦合情況,并通過數(shù)值算例分析了濕度、熱度、纖維方向角等因素對復(fù)合材料梁振動(dòng)頻率的影響。(3)第3章將旋轉(zhuǎn)引入復(fù)合材料薄壁梁模型,研究旋轉(zhuǎn)對復(fù)合材料薄壁梁固有頻率的影響。首先給出旋轉(zhuǎn)作用下復(fù)合梁單位長度的動(dòng)能和勢能表達(dá)式,基于Hamilton原理推導(dǎo)了旋轉(zhuǎn)復(fù)合材料薄壁梁耦合振動(dòng)控制方程,與第2章做對比說明旋轉(zhuǎn)對復(fù)合梁振動(dòng)方程及邊界條件的影響,根據(jù)Galerkin方法得到復(fù)合材料梁的特征方程,最后討論了旋轉(zhuǎn)、旋轉(zhuǎn)與其他因素的聯(lián)合作用對CUS和CAS兩種構(gòu)型梁振動(dòng)頻率的影響。(4)第4章研究傾角對旋轉(zhuǎn)復(fù)合材料薄壁梁振動(dòng)特性的影響。首先給出帶傾角的旋轉(zhuǎn)復(fù)合材料薄壁梁的建模方法和耦合振動(dòng)控制方程,與第3章做對比說明傾角對復(fù)合梁振動(dòng)方程及邊界條件的影響。采用數(shù)值方法研究了傾角、旋轉(zhuǎn)、纖維方向角等因素對復(fù)合材料薄壁梁振動(dòng)特性的影響規(guī)律。
[Abstract]:Composite thin wall beam has the advantages of light weight, high temperature resistance and high strength. It is widely used in engineering, such as helicopter rotor, wind turbine blade. The anisotropy of composite materials can make the different elastic deformation of beams coupled, rotation, inclination, moisture and other factors, which further aggravate the complexity of the dynamic behavior of composite thin-walled beams. The study of vibration characteristics is not only of great theoretical significance, but also of practical value. The main work of this paper is to study the external factors such as moisture and heat, rotation, inclination and other external factors on the tension of composite thin-walled beams. Chapter 1 introduces the research background and significance of this work and the thin-walled composite structure. The research status of rotating composite structure and composite structure in humid and thermal environment is reviewed. The research contents of this paper are briefly described. Chapter 2 establishes the composite thin-walled beam model. Based on the classical shell theory, the constitutive relation of single-layer composite materials and the Hamilton principle, the coupled vibration control equations of composite thin-walled beams under humid and thermal conditions are derived. The vibration coupling of two configurations, CUSS (uniform stiffness configuration) and CAS (antisymmetric stiffness configuration), is discussed, and the humidity and heat are analyzed by numerical examples. Effect of fiber direction angle on vibration frequency of composite beam. Chapter 3 introduces rotation into composite thin-walled beam model. The effect of rotation on the natural frequency of composite thin-walled beam is studied. Firstly, the kinetic energy and potential energy expression of the unit length of composite beam under rotation is given. Based on the Hamilton principle, the coupled vibration control equations of rotating composite thin-walled beams are derived, and the effects of rotation on the vibration equations and boundary conditions of composite beams are illustrated by comparison with Chapter 2. According to the Galerkin method, the characteristic equation of composite beam is obtained, and finally, the rotation is discussed. The effect of the combination of rotation and other factors on the Vibration Frequency of CUS and CAS Beams. In chapter 4, the effect of inclination angle on vibration characteristics of rotating composite thin wall beam is studied. Firstly, the modeling method and coupling vibration control equation of rotating composite thin wall beam with inclination angle are given. The effects of dip angle on vibration equation and boundary condition of composite beam are compared with that in chapter 3. The effects of dip angle, rotation angle and fiber direction angle on vibration characteristics of composite thin-walled beam are studied by numerical method.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33

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本文編號：1433729