Abstract
Vibration and noise reduction methods are important research directions in many industries. Mufflers are widely used in pipelines to reduce noise and vibration transmission. A theoretical analysis is conducted to determine the noise reduction mechanism of a muffler with a side outlet, and the results are verified with experiments. The quadrupole parameters of the muffler are obtained using transfer matrix analysis, and sensitivity analysis of the quadrupole parameters is conducted. The influence of the side outlet location on the transmission loss of the muffler is investigated experimentally using an impedance tube. The key factors affecting the transmission loss are analyzed. The theoretical calculation results of the transmission loss of the side outlet muffler are in good agreement with the experimental results.
Highlights
Vibration and noise reduction technology represent important research directions in many industries. e transmission of noise can be significantly reduced by installing noise reduction devices
E transmission loss of the side outlet muffler is a function of the frequency, length of the expansion chamber, the exit position, and the expansion ratio
It has been shown that the transmission loss of the side outlet muffler is a function of the frequency, the expansion cavity length, the outlet position, and the expansion ratio. e sensitivity of the quadrupole parameters of the muffler is analyzed theoretically, and the influence of the side outlet position on the transmission loss of the muffler is determined. e mechanism of noise reduction in the side outlet muffler is ascertained
Summary
Vibration and noise reduction technology represent important research directions in many industries. e transmission of noise can be significantly reduced by installing noise reduction devices. E quadrupole parameters of the muffler are obtained using the transfer matrix analysis method [16]. E sound pressure and vibration velocity of the muffler inlet and outlet are calculated to determine the transmission loss of the muffler using the quadrupole transfer matrix method [1]:. If the inlet and outlet temperatures of the muffler are the same and the cross-sectional areas of the inlet and outlet are the same, the transmission loss obtained by the quadrupole transfer matrix method is as follows [1]: TL. By substituting equation (4) into equation (3), the transmission loss of the traditional expansion chamber muffler is obtained as follows [19]: TL1. E transmission loss of the side outlet muffler is a function of the frequency, length of the expansion chamber, the exit position, and the expansion ratio. We describe the parameters of the side outlet muffler
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