Numerical Simulation Of Sound Absorption Properties Of Rubber Magnetorheological Materials

The rubber material is a kind of material which has a good sound-absorbing function,and reflects a good absorption effect in the middle and high frequency.It is widely used in construction,machinery,and the submarine.Using rubber materials has become an important means to reduce noise.This paper use the method of numerical simulation,by establishing different volume fraction model,to study the acoustic properties of materials,then the equivalent modulus of MRE were studied in different magnetic field by using the homogenization method,and the absorption coefficient and calculation.The main contents of this paper include the following aspects:Firstly,the two-dimensional model of different volume fraction with air and vacuum cavity rubber material is established.the sound absorption performance is simulated based on finite element method in the cavity.the results show that the material shows resonance absorption performance,and Sound absorption coefficientchanges with frequency,and tends to a slow transformation process.Secondly,the complex network model based on cavity is established.the complex network and sound absorption performance are combined,and the sound absorption performance is described by complex network.the average and average path length of the complex network increase with the increase of volume fraction,and the average clustering coefficient of complex network decreases gradually with the increase of volume fraction.In the case of constant frequency,with the increase of average degree and path length,the absorption coefficient increases,and with the increase of clustering coefficient,the absorption coefficient decreases.Thirdly,the establishment of 25% volume fraction of magnetorheological rubber material model was simulated under different magnetic field conditions,the sound absorption performance was calculated,the results show that the magnetic field influence the absorption coefficient in low and intermediate frequency peak,when the absorption coefficient increases,the magnetic field increased till 0.6T,the absorption coefficient remained unchanged,and only change trough band,not change the minimum size of the trough.At high frequencies,increasing magnetic fields increase the extreme value of peaks and troughs,and cause them to shift to higher frequencies.