The Cellular Automata Acoustic Modeling Of The Porous Material And The Research Of Acoustic Performance Of The Material Under The Intensive Of The High Sound Pressure

In this paper, the research of the sound absorber are divided into acoustic modeling to the porous material under the normal sound pressure and temperature and the theory simulation of the micro perforation panel. The porous material is modeling by CA to create a new absorption model of the porous material. The simulation of the micro perforation plate is achieved by COMSOL Multiphysics.The first one is the CA.The research is based on the propagation of the plane wave in the standing wave tube. We derived the local rules by the differential calculation of the 1D small amplitude wave equation and the analysis of the boundary conditions to create the 1D cellular space and then get the acoustic pressure distribution of the plane wave in the standing wave tube when there is no absorber in the end of the tube. Next, we put the absorber in the tube, and derived the local rules in the space of the absorber, then get the acoustic pressure distribution in this condition. Finally, we simulated the standing wave method to calculate the sound absorption of the porous material which are in good agreement with the experimental data.The second one is the simulation of the micro perforation plate whose structure are more regular than the porous material under the high sound pressure level. We derived the equation and created the calculation model and make a simulation to the micro perforation plate by COMSOL. The structure parameters that affect the sound absorption of the micro perforation are also obtained by the simulation results. The simulation’s research object is micro perforation panel and it has certain guiding significance to the research of the sound absorption of porous materials under the high sound pressure level because there are many things in common in the sound absorption mechanisms between the micro perforation panel and the porous material,although the micro perforation panel belongs to resonance absorber.