本文選題：多層波紋管 + 粘彈性�。� 參考：《河南科技大學(xué)》2011年碩士論文

【摘要】：多層波紋管具有較強(qiáng)的位移補(bǔ)償和減振降噪能力。利用合適的金屬材料和粘彈性阻尼材料制作出多層波紋管的金屬薄殼和阻尼夾層,這種多層波紋管具有很好的阻尼特性,可以更有效地降低管道的振動(dòng)噪聲,達(dá)到減振降噪的目的。 本文以含夾層阻尼的多層波紋管為研究對(duì)象,經(jīng)理論分析、數(shù)值仿真和實(shí)驗(yàn)驗(yàn)證,對(duì)多層波紋管等效阻尼的影響因素及其作用規(guī)律進(jìn)行了研究。損耗因子是衡量阻尼材料耗散振動(dòng)能量的主要指標(biāo)之一,阻尼能越大則粘彈性阻尼材料的損耗因子就越大。利用ANSYS有限元分析軟件建立含夾層阻尼的多層波紋管的有限元模型,采用APDL編程語(yǔ)言編寫(xiě)的模態(tài)應(yīng)變能迭代法求解出多層波紋管的損耗因子。討論分析了粘彈性阻尼特性、多層波紋管幾何參數(shù)和結(jié)構(gòu)構(gòu)型對(duì)多層波紋管損耗因子的影響及其作用規(guī)律。分析結(jié)果表明:多層波紋管的損耗因子隨粘彈性阻尼材料模量的增加先迅速增加,到達(dá)峰值后緩慢減小,隨粘彈性阻尼材料厚度的增加先迅速減小后逐漸增加,而粘彈性阻尼材料密度的變化對(duì)多層波紋管的損耗因子沒(méi)有影響;其它參數(shù)不變,多層波紋管的損耗因子隨波高的增大而增大,隨波距和直徑的增大而減小,隨壁厚的增加先迅速減小后逐漸增加,隨波數(shù)和層數(shù)的增加而增大。所以為使多層波紋管具有理想的減振降噪能力,需要綜合考慮粘彈性阻尼材料特性、多層波紋管幾何參數(shù)和結(jié)構(gòu)構(gòu)型。 對(duì)多層波紋管進(jìn)行試驗(yàn)?zāi)B(tài)分析,經(jīng)參數(shù)識(shí)別得出其損耗因子。將試驗(yàn)結(jié)果與仿真結(jié)果相比較,誤差僅為6.25%,能滿足工程實(shí)際應(yīng)用要求,驗(yàn)證了仿真結(jié)果的正確性,說(shuō)明采用模態(tài)應(yīng)變能迭代法求解多層波紋管的損耗因子是可行的。 本文為研究含夾層阻尼的多層波紋管的最佳阻尼處理方式提供了一定的參考依據(jù),對(duì)含夾層阻尼的多層波紋管的設(shè)計(jì)制造和工程應(yīng)用提供了一定的參考價(jià)值,對(duì)提高我國(guó)多層波紋管的減振降噪能力具有重要的現(xiàn)實(shí)意義。
[Abstract]:Multilayer corrugated tube has strong displacement compensation and vibration reduction and noise reduction ability. The thin metal shell and damping sandwich of multilayer bellows are made by using suitable metal material and viscoelastic damping material. The multilayer bellows have good damping characteristics and can effectively reduce the vibration and noise of pipes. The aim of reducing vibration and noise is achieved. In this paper, multilayer bellows with sandwich damping are taken as the research object. Through theoretical analysis, numerical simulation and experimental verification, the factors affecting the equivalent damping of multilayer bellows and their action law are studied. The loss factor is one of the main indexes to measure the dissipative vibration energy of damping materials. The larger the damping energy, the greater the loss factor of viscoelastic damping materials. The finite element model of multilayer bellows with sandwich damping is established by using ANSYS finite element analysis software. The loss factor of multilayer bellows is solved by using the modal strain energy iterative method compiled by APDL programming language. The effects of viscoelastic damping characteristics, geometric parameters and structural configuration of multilayer bellows on the loss factor of multilayer bellows are discussed and analyzed. The results show that the loss factor of multilayer corrugated tube increases rapidly with the increase of viscoelastic damping material modulus, and then decreases slowly with the increase of viscoelastic damping material thickness, and then increases gradually with the increase of viscoelastic damping material thickness. However, the density of viscoelastic damping material has no effect on the loss factor of multilayer bellows, while the loss factor of multilayer bellows increases with the increase of wave height and decreases with the increase of wave distance and diameter. With the increase of wall thickness, it decreases rapidly and then increases gradually, and increases with the increase of wavenumber and layer number. It is considered that the multilayer bellows have the ideal ability to reduce vibration and noise, and it is necessary to consider the characteristics of viscoelastic damping materials, geometric parameters and structural configuration of multilayer corrugated tubes. The experimental modal analysis of multilayer bellows is carried out and the loss factor is obtained by parameter identification. Comparing the experimental results with the simulation results, the error is only 6.25, which can meet the requirements of practical engineering application. The correctness of the simulation results is verified. It is proved that it is feasible to use the modal strain energy iterative method to solve the loss factor of multi-layer bellows. This paper provides a certain reference for the study of the optimal damping treatment of multi-layer bellows with sandwich damping, and provides a certain reference value for the design, manufacture and engineering application of multi-layer bellows with sandwich damping. It is of great practical significance to improve the ability of reducing vibration and noise of multilayer bellows in China.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH136

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