本文選題：薄殼構(gòu)件 + 硬涂層阻尼��； 參考：《東北大學(xué)》2015年碩士論文

【摘要】：由于硬涂層可在高溫、高腐蝕環(huán)境下減少薄殼結(jié)構(gòu)的振動(dòng)響應(yīng),而受到越來(lái)越廣泛的關(guān)注。為了更好的實(shí)施硬涂層阻尼減振,需要獲得硬涂層的減振機(jī)理,即涂敷硬涂層后結(jié)構(gòu)件振動(dòng)響應(yīng)減少的原因,進(jìn)而實(shí)施硬涂層減振優(yōu)化設(shè)計(jì)�，F(xiàn)有的關(guān)于硬涂層減振機(jī)理的研究,多集中于微觀材料學(xué),且多數(shù)學(xué)者認(rèn)為硬涂層微觀顆粒之間的內(nèi)摩擦是硬涂層能夠減振的原因。但是,完全基于材料學(xué)研究的硬涂層減振機(jī)理是不夠的,尚需要從宏觀動(dòng)力學(xué)的角度,創(chuàng)建硬涂層復(fù)合結(jié)構(gòu)的動(dòng)力學(xué)分析模型,進(jìn)而研究硬涂層的減振機(jī)理。本文以涂敷硬涂層的梁、薄板以及薄圓柱殼為研究對(duì)象,在科學(xué)引入硬涂層材料力學(xué)特點(diǎn)的基礎(chǔ)上,建立了硬涂層阻尼減振機(jī)理分析模型并且利用相關(guān)模型進(jìn)行了應(yīng)變能測(cè)試以及硬涂層參數(shù)影響分析等應(yīng)用研究,具體研究?jī)?nèi)容體現(xiàn)在如下五方面:首先,從分離硬涂層的阻尼貢獻(xiàn)出發(fā),研究了創(chuàng)建硬涂層懸臂梁復(fù)合結(jié)構(gòu)減振機(jī)理分析模型的方法。具體可描述為:對(duì)涂層前后的懸臂梁系統(tǒng)進(jìn)行了減振特性實(shí)驗(yàn),獲得了固有頻率、阻尼比、振動(dòng)響應(yīng)等參數(shù);對(duì)涂層前后懸臂梁系統(tǒng)的儲(chǔ)能及耗能進(jìn)行分析,獲取硬涂層材料的阻尼貢獻(xiàn);基于Oberst梁理論,創(chuàng)建了同時(shí)考慮材料阻尼和粘性阻尼的懸臂梁系統(tǒng)減振機(jī)理分析模型,并用實(shí)驗(yàn)校驗(yàn)了分析模型的正確性。其次,研究了創(chuàng)建硬涂層懸臂薄板復(fù)合結(jié)構(gòu)減振機(jī)理分析模型的方法。建模過(guò)程如下:對(duì)涂層前后的懸臂薄板系統(tǒng)進(jìn)行了減振特性實(shí)驗(yàn),獲得了固有頻率、阻尼比、振動(dòng)響應(yīng)等參數(shù);對(duì)涂層前后懸臂薄板系統(tǒng)儲(chǔ)能及耗能分析的基礎(chǔ)上,確定了獲取硬涂層材料阻尼貢獻(xiàn)的方法;基于拉格朗日方程,創(chuàng)建了同時(shí)考慮材料阻尼和粘性阻尼的懸臂薄板系統(tǒng)減振機(jī)理分析模型,并用實(shí)驗(yàn)校驗(yàn)了分析模型的正確性。然后,以涂層前后圓柱殼為對(duì)象,研究創(chuàng)建了硬涂層圓柱殼的減振減振機(jī)理分析模型。研究過(guò)程可描述為:進(jìn)行振動(dòng)測(cè)試實(shí)驗(yàn),通過(guò)掃頻激勵(lì)和定頻激勵(lì)得到涂層前后圓柱殼的固有頻率和共振響應(yīng),進(jìn)而以幅頻特性曲線(xiàn),應(yīng)用半功率帶寬法得到涂層前后圓柱殼的模態(tài)阻尼比,基于Love薄殼理論,推導(dǎo)得到硬涂層圓柱殼的線(xiàn)性振動(dòng)方程。利用能量法確定硬涂層圓柱殼的振動(dòng)特征方程,基于Galerkin離散對(duì)硬涂層圓柱殼特征方程進(jìn)行求解,確定硬涂層圓柱殼的固有頻率;依據(jù)Obest理論引入涂層材料的損耗因子,采用梁函數(shù)組合法求解硬涂層的圓柱殼的共振響應(yīng);相關(guān)結(jié)果與實(shí)驗(yàn)比對(duì),證明了所創(chuàng)建模型的合理性。接著,利用硬涂層懸臂梁減振機(jī)理分析模型,研究了間接測(cè)試硬涂層復(fù)合件應(yīng)變能的方法。在對(duì)涂層前后懸臂梁系統(tǒng)應(yīng)變能分析的基礎(chǔ)上,確定了間接辨識(shí)涂層前后構(gòu)件應(yīng)變能的原理及方法,并提出了具體的辨識(shí)流程,包括:測(cè)試懸臂梁的共振位移響應(yīng);測(cè)試模態(tài)阻尼;利用模型修正技術(shù)與實(shí)驗(yàn)匹配;繪制梁共振狀態(tài)的撓曲線(xiàn);辨識(shí)應(yīng)變能等步驟。利用涂敷NiCrA1Y前后的鈦梁進(jìn)行了實(shí)例研究,有效獲取了應(yīng)變能,并證明了該硬涂層對(duì)鈦梁有減振效果。最后,利用所創(chuàng)建的硬涂層圓柱殼減振機(jī)理分析模型,分析了包括楊氏模量、損耗因子以及涂層厚度等硬涂層參數(shù)對(duì)圓柱殼振動(dòng)特性的影響規(guī)律。結(jié)果表明:隨著涂層楊氏模量、厚度的逐漸增加,涂層后的復(fù)合圓柱殼的固有頻率有一定幅度的增大,共振響應(yīng)逐漸減小;隨著涂層的損耗因子的逐漸增加,硬涂層復(fù)合圓柱殼的共振響應(yīng)逐漸越小,但是,對(duì)于硬涂層復(fù)合圓柱殼的固有頻率沒(méi)有影響。本文可為在硬涂層減振研究中,為進(jìn)一步選擇與制備硬涂層材料以及深入研究硬涂層的阻尼減振機(jī)理提供參考,也可為硬涂層減振技術(shù)在動(dòng)力裝備薄殼結(jié)構(gòu)上推廣應(yīng)用提供支持。
[Abstract]:Because hard coating can reduce vibration response of thin shell structure under high temperature and high corrosion environment, it has received more and more attention. In order to better implement the damping of hard coating, it is necessary to obtain the vibration damping mechanism of hard coating, that is, the reason of reducing the vibration response of the hard coating after coating hard coating, and then implementing the optimization design of the hard coating. The research on the vibration damping mechanism of hard coating is mainly focused on micro material science, and many mathematicians think the internal friction between hard coating micro particles is the reason why hard coatings can reduce vibration. However, the vibration damping mechanism of hard coatings based on material studies is not enough. It is still necessary to create hard coating composite structures from the perspective of macro dynamics. In this paper, on the basis of the mechanical characteristics of hard coating materials, the analysis model of the damping mechanism of hard coating is established on the basis of the mechanical characteristics of hard coating materials, and the strain energy test and hard coating are carried out with the related model. The specific research content of the parameter influence analysis is embodied in the following five aspects: first, starting from the damping contribution of the hard coating, the method of establishing the analysis model of the vibration damping mechanism of the hard coating cantilever beam composite structure is studied. The concrete can be described as: the vibration damping characteristic experiment of the cantilever beam system before and after the coating has been carried out, and the inherent characteristics are obtained. Frequency, damping ratio, vibration response and other parameters, the energy storage and energy consumption of the cantilever beam system before and after coating are analyzed, and the damping contribution of hard coated materials is obtained. Based on the Oberst beam theory, an analysis model of the damping mechanism of cantilever beam system with material damping and viscous damping is created, and the correctness of the analysis model is verified by experiments. At the same time, the method of creating an analysis model for the vibration damping mechanism of a hard coated cantilever plate composite structure is studied. The modeling process is as follows: the vibration damping characteristics of the cantilever plate system before and after the coating are tested, and the parameters of natural frequency, damping ratio and vibration response are obtained. Based on the analysis of energy storage and energy consumption of the cantilever thin plate system before and after the coating, it is determined that A method for obtaining the damping contribution of hard coated materials is obtained. Based on the Lagrange equation, an analysis model of the vibration damping mechanism of a cantilever plate system with both material damping and viscous damping is created, and the correctness of the model is verified by experiments. Then, the damping and vibration reduction of a hard coated cylindrical shell is established by using the cylindrical shell before and after the coating as the image. The mechanism analysis model can be described as a vibration test experiment. The natural frequency and resonance response of the cylindrical shell before and after the coating are obtained through the sweep frequency excitation and the constant frequency excitation, and then the modulus damping ratio of the cylindrical shell before and after the coating is obtained by the amplitude frequency characteristic curve, and the hard coating is derived based on the Love thin shell theory. The linear vibration equation of the cylindrical shell is used to determine the vibration characteristic equation of the hard coated cylindrical shell. Based on the Galerkin dispersion, the characteristic equation of the hard coated cylindrical shell is solved, and the natural frequency of the hard coated cylindrical shell is determined. Based on the Obest theory, the loss factor of the coating material is introduced and the hard coating circle is solved by the array of beam functions. The resonance response of the cylindrical shell is compared with the experimental comparison, which proves the rationality of the model created. Then, the method of indirect testing the strain energy of hard coated composite parts is studied by using the analysis model of the vibration damping mechanism of hard coated cantilever beam. On the basis of the strain energy analysis of the cantilever beam system before and after the coating, the indirect identification of the front and rear structures of the coating is determined. The principle and method of the strain energy are introduced, and the specific identification process is presented, including testing the resonance displacement response of the cantilever beam, testing the modal damping, using the model correction technique to match the experiment, drawing the deflection curve of the beam resonance state, identifying the strain energy and so on. The application of the titanium beam before and after the application of NiCrA1Y has been effectively obtained. It is proved that the hard coating has a damping effect on the titanium beam. Finally, the influence rule of hard coating parameters, including young's modulus, loss factor and coating thickness, on the vibration characteristics of cylindrical shell is analyzed by using the analysis model of the vibration damping mechanism of the hard coated cylindrical shell. Adding, the natural frequency of the composite cylindrical shell increases to a certain extent, and the resonance response decreases gradually. With the gradual increase of the loss factor of the coating, the resonance response of the hard coated composite cylindrical shell is gradually smaller, but it has no effect on the natural frequency of the hard coated composite cylindrical shell. This paper can be used in the study of the vibration damping of hard coating. The further selection and preparation of hard coating materials, as well as the study of the damping mechanism of hard coatings, can also provide support for the application of hard coating vibration damping technology to the application of the thin shell structure of power equipment.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB30

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 吳晴晴;王敏慶;;考慮基底層阻尼的自由阻尼結(jié)構(gòu)損耗因子修正公式[J];振動(dòng)與沖擊;2014年13期

2 肖和業(yè);盛美萍;陳永輝;;阻尼材料動(dòng)態(tài)參數(shù)測(cè)量的波數(shù)方法[J];振動(dòng).測(cè)試與診斷;2012年04期

3 楊毅;魏光濤;閻桂榮;;圓柱殼自由振動(dòng)特性分析方法研究[J];應(yīng)用力學(xué)學(xué)報(bào);2011年01期

4 毛柳偉;王安穩(wěn);胡明勇;;粘-彈層合懸臂板瞬態(tài)響應(yīng)的近似解析解[J];固體力學(xué)學(xué)報(bào);2010年04期

5 胡明勇;王安穩(wěn);;自由阻尼懸臂梁瞬態(tài)響應(yīng)的近似解析解[J];華中科技大學(xué)學(xué)報(bào)(自然科學(xué)版);2009年11期

6 王延慶;郭星輝;常海紅;巴穎;;旋轉(zhuǎn)薄壁圓柱殼振型進(jìn)動(dòng)的非線(xiàn)性振動(dòng)特性[J];固體力學(xué)學(xué)報(bào);2009年03期

7 李健;郭星輝;李永剛;顏云輝;董家林;;基于Galerkin法的旋轉(zhuǎn)薄壁圓柱殼非線(xiàn)性行波振動(dòng)的數(shù)值分析[J];振動(dòng)與沖擊;2008年12期

8 唐文勇;王天霖;張圣坤;;含分層損傷復(fù)合材料圓柱殼非線(xiàn)性動(dòng)力響應(yīng)[J];上海交通大學(xué)學(xué)報(bào);2007年03期

9 李俊,金咸定;Timoshenko薄壁梁彎扭耦合振動(dòng)的動(dòng)態(tài)傳遞矩陣法[J];振動(dòng)與沖擊;2001年04期

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本文編號(hào)：2003609