磁流变橡胶材料吸声性能数值模拟
发布时间：2018-07-23 20:48
【摘要】：橡胶吸声材料是一类具有较好吸声功能的材料,在中高频段体现出有良好的吸声效果,其在建筑,机械,潜艇等各方面运用广泛,使用橡胶吸声材料已成为当前及其重要的一种降噪手段。本文使用数值模拟的方法,首先建立了不同体积分数的的材料模型,研究了材料的吸声性能,使用复杂网络拓扑参数描述其吸声性能,然后使用均匀化的方法研究了磁流变吸声材料在各个磁场下的等效模量,并计算了吸声系数。本文的研究内容主要包括以下几个方面:第一,建立不同体积分数含空腔橡胶材料的二维模型,在空腔内部分别含有空气和真空时基于有限元对其吸声性能进行了模拟,结果表明材料表现出了共振吸声性能,吸声系数频谱随频率变化而上下波动最后趋向于一个缓慢变换的过程。第二,建立基于空腔的复杂网络模型,将复杂网络与吸声性能相结合,使用复杂网络描述吸声性能,其中空腔复杂网络的平均度和平均路径长度随着体积分数增加而增大,复杂网络平均聚类系数随着体积分数增大而逐渐减小。在频率不变的情况下,随着平均度和平均路径长度增大,材料吸声系数也增大,随着聚类系数的增大,材料的吸声系数逐渐减小。第三,建立25%体积分数磁流变橡胶材料模型,在不同磁场条件下进行了模拟,计算其吸声性能,结果表明磁场在低中频时影响吸声系数的波峰频段,并使吸声系数增加,磁场增加到0.6T时,吸声系数基本保持不变,而只改变波谷频段,不改变波谷最小值大小。在高频时,磁场增加会同时增大波峰波谷的极值,并使它们向更高频平移。
[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.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ330.1;O157.5
本文编号：2140598
[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.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ330.1;O157.5
【参考文献】
相关博士学位论文 前2条
1 沈岳;活性炭纤维材料吸声特性研究[D];江南大学;2015年
2 罗善德;基于Biot理论的电磁流变液吸声特性研究[D];华中科技大学;2015年
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