發(fā)布時(shí)間：2018-08-05 11:15

【摘要】：硬涂層是指由金屬基、陶瓷基或兩者的混合制成的涂層材料。近年來(lái)的研究發(fā)現(xiàn),涂敷硬涂層的結(jié)構(gòu)系統(tǒng)阻尼系數(shù)增加、共振應(yīng)力降低,即硬涂層具有阻尼減振的效果。預(yù)測(cè)硬涂層復(fù)合結(jié)構(gòu)的阻尼性能是硬涂層阻尼減振研究中的一個(gè)關(guān)鍵內(nèi)容。模態(tài)應(yīng)變能法是預(yù)測(cè)復(fù)合結(jié)構(gòu)阻尼性能的一種經(jīng)典方法。但經(jīng)典的模態(tài)應(yīng)變能法卻無(wú)法直接應(yīng)用于硬涂層復(fù)合結(jié)構(gòu)的阻尼性能預(yù)估中。本文在考慮硬涂層材料中小阻尼特點(diǎn)以及修正經(jīng)典模態(tài)應(yīng)變能法計(jì)算誤差的前提下,提出了一種適用于硬涂層復(fù)合結(jié)構(gòu)阻尼性能預(yù)估的新方法,并開(kāi)展了涂敷位置優(yōu)化設(shè)計(jì)研究,具體研究?jī)?nèi)容體現(xiàn)在以下4方面：首先,闡述了模態(tài)應(yīng)變能法的基本理論。給出了求解整體模態(tài)應(yīng)變能以及單元模態(tài)應(yīng)變能的理論公式。用懸臂鈦板結(jié)構(gòu)予以舉例例證,應(yīng)用ANSYS和Matlab分別計(jì)算了固支薄板結(jié)構(gòu)前6階的固有頻率、整體模態(tài)應(yīng)變能和單元模態(tài)應(yīng)變能分布,敘述了求解模態(tài)應(yīng)變能的具體流程及主要命令,并對(duì)比兩者的計(jì)算結(jié)果。然后,介紹了應(yīng)用經(jīng)典模態(tài)應(yīng)變能法預(yù)估硬涂層復(fù)合結(jié)構(gòu)阻尼的過(guò)程。在改善經(jīng)典模態(tài)應(yīng)變能法計(jì)算誤差的背景下,提出了兩種修正模態(tài)應(yīng)變能法用于硬涂層復(fù)合結(jié)構(gòu)阻尼性能的預(yù)估,推導(dǎo)了修正模態(tài)應(yīng)變能法的原理性公式,描述了預(yù)估硬涂層復(fù)合結(jié)構(gòu)阻尼性能的計(jì)算流程。并以一個(gè)涂敷Mg-AL硬涂層的懸臂薄板為例進(jìn)行了實(shí)例研究。再則,討論了硬涂層材料楊氏模量、損耗因子和涂層厚度對(duì)結(jié)構(gòu)系統(tǒng)阻尼性能的影響。分別探究了單一因素和兩兩組合因素對(duì)阻尼性能的影響規(guī)律。結(jié)果發(fā)現(xiàn)增大硬涂層的楊氏模量、損耗因子及厚度均可以提高復(fù)合結(jié)構(gòu)的阻尼性能。最后,針對(duì)硬涂層薄板結(jié)構(gòu)完成了局部涂敷的阻尼優(yōu)化設(shè)計(jì)。局部涂敷硬涂層位置的選擇是依據(jù)模態(tài)應(yīng)變能法計(jì)算獲得的。討論了抑制單一階次和多階次振動(dòng)的阻尼優(yōu)化情況,并探究了局部涂敷面積對(duì)復(fù)合結(jié)構(gòu)阻尼性能的影響。設(shè)計(jì)實(shí)施了多組實(shí)驗(yàn),很好地驗(yàn)證了用模態(tài)應(yīng)變能法進(jìn)行阻尼優(yōu)化設(shè)計(jì)的相關(guān)結(jié)論。本文的研究成果可為硬涂層材料制備及阻尼減振設(shè)計(jì)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)中的應(yīng)用提供支持。
[Abstract]:A hard coating is a coating material made of metal, ceramic, or a mixture of the two. In recent years, it has been found that the damping coefficient of the structure coated with hard coating increases and the resonance stress decreases, that is, the hard coating has the effect of damping and damping vibration. Predicting the damping performance of hard coating composite structure is a key content in the research of hard coating damping and vibration absorption. Modal strain energy method is a classical method for predicting damping performance of composite structures. However, the classical modal strain energy method can not be directly applied to the damping performance prediction of hard coated composite structures. In this paper, a new method for predicting damping performance of hard coated composite structures is proposed on the premise of considering the characteristics of medium and small damping of hard coating materials and correcting the calculation error of classical modal strain energy method. The optimum design of coating position is studied in the following four aspects: firstly, the basic theory of modal strain energy method is expounded. The theoretical formulas for solving the global modal strain energy and the element modal strain energy are given. With the example of cantilever titanium plate structure, ANSYS and Matlab are used to calculate the first 6 natural frequencies, the global modal strain energy and the element modal strain energy distribution of the clamped thin plate structure, respectively. The concrete flow and main commands of solving modal strain energy are described, and the calculation results are compared. Then, the process of estimating the damping of hard coating composite structure by classical mode strain energy method is introduced. Under the background of improving the calculation error of classical modal strain energy method, two modified mode strain energy methods are proposed to predict the damping performance of hard-coated composite structures. The principle formula of modified mode strain energy method is derived. The calculation flow of damping performance of hard coating composite structure is described. A cantilever plate coated with Mg-AL hard coating is taken as an example. Furthermore, the effects of Young's modulus, loss factor and coating thickness on the damping properties of hard coating materials are discussed. The influence of single factor and couple factor on damping performance is studied respectively. The results show that the damping properties of the composite structure can be improved by increasing the Young's modulus, loss factor and thickness of the hard coating. Finally, the damping optimization design of hard coated thin plate structure is completed. The location of hard coating is calculated by modal strain energy method. The damping optimization of single and multi-order vibration suppression is discussed, and the effect of local coating area on the damping performance of composite structures is discussed. Many experiments have been carried out to verify the conclusion that the modal strain energy method is used to optimize the damping design. The research results in this paper can be used as reference for the preparation of hard coating materials and the design of damping vibration, and also for the application of hard coating damping technology in 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】：2014
【分類號(hào)】：TB535.1

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