Experimental and numerical investigation of transmission loss in a zero-flow silencer

Document Type : Research Article

Authors

1 Department of Mechanical Engineering , Ferdowsi University of Mashhad, Mashhad, Iran

2 Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

3 Department of Food Machinery Design, Research Institute of Food Science. Mashhad. Iran

Abstract

To evaluate the acoustic performance of the muffler at zero flow, different methods of determining transmission loss were studied. Both numerical and experimental approaches were used to calculate transmission loss. The numerical method employed was the Herschel-Quincke tube method (case 1) as well as simulation methods using COMSOL (2) and ANSYS (3). The experimental approach utilized the transfer matrix method with the aid of software developed by the B&K software (4) and the sound card with MATLAB software (5) was used to calculate the transmission loss. Furthermore, the mesh independence of numerical methods and the uncertainty of the experimental method were examined. Results were evaluated between 20 and 1900 Hz, which is an appropriate frequency range and reliable range for evaluating mufflers and comparing different cases to transmission loss calculations. According to the results, the equivalent transmission loss for cases 1 to 5 is approximately 5.81 dB, 5.35 dB, 5.21 dB, 4.08 dB, and 3.77 dB, respectively Based on the results obtained, it can be concluded that the equivalent transmission loss of ANSYS and COMSOL numerical methods is almost consistent, and COMSOL simulation results in a 8% lower equivalent transmission loss than Herschel-Quincke's one-dimensional numerical method. Similarly, the equivalent transmission loss of experimental calculation methods indicates that the sound card approach has a 7.5% lower equivalent transmission loss than the B&K software approach.

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 3
June 2024
Pages 5-5

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