Transmission loss estimation of three dimensional silencers with perforated internal structures using multi-domain BEM
- 170 Downloads
The calculation of the transmission loss of the silencers with complicated internal structures by the conventional BEM combined with the transfer matrix method is incorrect at best or impossible for 3-dimensional silencers due to its inherent plane wave assumption. On this consideration, we propose an efficient practical means to formulate algebraic overall condensed acoustic equations for the whole acoustic structure, where particle velocities on the domain interface boundaries are unknowns, and the solutions are used later to compute the overall transfer matrix elements, based on the multi-domain BEM data. The transmission loss estimation by the proposed method is tested by comparison with the experimental one on an air suction silencer with perforated internal structures installed in air compressors. The method shows its viability by presenting the reasonably consistent anticipation of the experimental result.
Key WordsTransmission Loss Overall Condensed Acoustic Equation Multi-domain BEM (Boundary Element Method) Air Suction Silencer
Unable to display preview. Download preview PDF.
- Jeon, W. H., Rew, H. S. and Kim, C. J., 2004, “Aeroacoustic Characteristics and Noise Reduction of a Centrifugal Fan for a Vacuum Cleaner,”KSME International Journal, Vol.18, No. 2, pp. 185–192.Google Scholar
- Ju, H. D. and Lee, S. B., 2001, “Multi-Domain Structural-Acoustic Coupling Analysis Using the Finite Element and Boundary Element Techniques,”KSME International Journal, Vol. 15, No. 5, pp. 555–561.Google Scholar
- Munjal, M. L., 1987, “Acoustics of Ducts and Mufflers”, John Wiley & Sons.Google Scholar
- Tanaka, T. and Fujikawa, T., 1985, “A Method for the Analytical Prediction of Insertion Loss of a Two-dimensional Muffler Model Based on the Transfer Matrix Derived From the Boundary Element Method,”J. Vib. Acoust Stress Rel Dsgn., Vol. 107, pp. 86–91.Google Scholar