Investigation on Impedance Chip Muffler Performance

Nowadays it is quite significant to control the noise generated from the fan, air conditioning and air flow, as well as to reduce the noise pressure level. The chip mufflers have been widely used for its advantages of large air volume and high amount of noise elimination. The method adopted in our study is comparison. Before determining the muffler insertion loss, we should do the controlled experiment without the muffler, then we use the muffler to replace the duct for the experiment. So we can obtain the insertion loss by measuring the noise level in the two different conditions. Attention should be paid to the noise conditions and the main duct speed which should remain the same in the whole experiment process. By measuring, calculating and analyzing the insertion loss of the chip mufflers with different silencing cotton density under different main duct speed, verifying that the muffler have a very good silencing effectiveness for the high and intermediate frequency noise, reaching the quadratic relationship between noise elimination and silencing cotton density which is beneficial to optimize the chip muffler performance in the future.