The Novel Design of A Engine Exhaust Muffler

According to the noise loss of the original muffler obtained by the experimental research,this paper analyzed the noise frequency character through the muffler and identified the noise band which has not been restrained by the muffler.The three-dimensional and finite element model of the muffler was built respectively by the modeling software and the mesh dividing software.The analysis for the acoustic field of muffler was carried out using the acoustic analysis software and the noise frequency character of the muffler was obtained meanwhile.On the basis of experimental and numerical investment,the structural parameters and the arrangement form of the muffler were improved according to the Resistance Muffler theory.A novel type of resistance muffler was designed.The simulation result indicates that the main performance of the new one was superior to the original one and that it meets the project requirements that the total noise is less than 90dB.