【摘要】：橡膠吸聲材料是一類(lèi)具有較好吸聲功能的材料,在中高頻段體現(xiàn)出有良好的吸聲效果,其在建筑,機(jī)械,潛艇等各方面運(yùn)用廣泛,使用橡膠吸聲材料已成為當(dāng)前及其重要的一種降噪手段。本文使用數(shù)值模擬的方法,首先建立了不同體積分?jǐn)?shù)的的材料模型,研究了材料的吸聲性能,使用復(fù)雜網(wǎng)絡(luò)拓?fù)鋮?shù)描述其吸聲性能,然后使用均勻化的方法研究了磁流變吸聲材料在各個(gè)磁場(chǎng)下的等效模量,并計(jì)算了吸聲系數(shù)。本文的研究?jī)?nèi)容主要包括以下幾個(gè)方面:第一,建立不同體積分?jǐn)?shù)含空腔橡膠材料的二維模型,在空腔內(nèi)部分別含有空氣和真空時(shí)基于有限元對(duì)其吸聲性能進(jìn)行了模擬,結(jié)果表明材料表現(xiàn)出了共振吸聲性能,吸聲系數(shù)頻譜隨頻率變化而上下波動(dòng)最后趨向于一個(gè)緩慢變換的過(guò)程。第二,建立基于空腔的復(fù)雜網(wǎng)絡(luò)模型,將復(fù)雜網(wǎng)絡(luò)與吸聲性能相結(jié)合,使用復(fù)雜網(wǎng)絡(luò)描述吸聲性能,其中空腔復(fù)雜網(wǎng)絡(luò)的平均度和平均路徑長(zhǎng)度隨著體積分?jǐn)?shù)增加而增大,復(fù)雜網(wǎng)絡(luò)平均聚類(lèi)系數(shù)隨著體積分?jǐn)?shù)增大而逐漸減小。在頻率不變的情況下,隨著平均度和平均路徑長(zhǎng)度增大,材料吸聲系數(shù)也增大,隨著聚類(lèi)系數(shù)的增大,材料的吸聲系數(shù)逐漸減小。第三,建立25%體積分?jǐn)?shù)磁流變橡膠材料模型,在不同磁場(chǎng)條件下進(jìn)行了模擬,計(jì)算其吸聲性能,結(jié)果表明磁場(chǎng)在低中頻時(shí)影響吸聲系數(shù)的波峰頻段,并使吸聲系數(shù)增加,磁場(chǎng)增加到0.6T時(shí),吸聲系數(shù)基本保持不變,而只改變波谷頻段,不改變波谷最小值大小。在高頻時(shí),磁場(chǎng)增加會(huì)同時(shí)增大波峰波谷的極值,并使它們向更高頻平移。
[Abstract]:Rubber sound absorbing material is a kind of material with good sound absorption function. It has good sound absorption effect in medium and high frequency band. It is widely used in construction, machinery, submarine and so on. The use of rubber sound absorption materials has become an important means of noise reduction. In this paper, the numerical simulation method is used to establish the material model with different volume fraction, and the sound absorption performance of the material is studied, and the sound absorption performance is described by using the topological parameters of complex network. Then the equivalent modulus of magneto-rheological acoustical absorber under various magnetic fields is studied by homogenization method and the sound absorption coefficient is calculated. The main research contents of this paper are as follows: first, the two-dimensional model of rubber material with different volume fraction containing cavity is established, and the sound absorption performance is simulated based on finite element method when the cavity contains air and vacuum, respectively. The results show that the material exhibits resonance sound absorption property and the spectrum of absorption coefficient fluctuates up and down with the change of frequency and finally tends to a slow transformation process. Secondly, the complex network model based on cavity is established, which combines the complex network with the sound absorption performance, and uses the complex network to describe the sound absorption performance, in which the average degree and the average path length of the cavity complex network increase with the increase of volume fraction. The average clustering coefficient of complex networks decreases with the increase of volume fraction. In the case of constant frequency, the sound absorption coefficient of the material increases with the increase of the average degree and the average path length, and decreases with the increase of the clustering coefficient. Thirdly, a 25% volume fraction magneto-rheological rubber material model is established and simulated under different magnetic fields to calculate its sound absorption performance. The results show that the magnetic field affects the peak band of the sound absorption coefficient at low intermediate frequency and increases the sound absorption coefficient. When the magnetic field is increased to 0.6 T, the sound absorption coefficient remains basically unchanged, but only the frequency band of the wave trough is changed, and the minimum value of the wave trough is not changed. At high frequency, the increase of magnetic field will increase the extreme value of peak and trough and make them move to higher frequency.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TQ330.1;O157.5

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相關(guān)博士學(xué)位論文 前2條

1 沈岳;活性炭纖維材料吸聲特性研究[D];江南大學(xué);2015年

2 羅善德;基于Biot理論的電磁流變液吸聲特性研究[D];華中科技大學(xué);2015年

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本文編號(hào)：2140598