Abstract
The inlet and outlet locations of expansion chambers can significantly affect the acoustic attenuation performance of the silencer, due to their control over the excitation and suppression of higher order modes. By combining the continuity conditions of the acoustic pressure and particle velocity with the orthogonality relations of Fourier–Bessel functions at the inlet and outlet discontinuities, the present study develops a three-dimensional analytical approach to determine the transmission loss of circular expansion chambers with offset inlet and outlet ducts. The results obtained from the present approach are compared with the classical one-dimensional predictions and the earlier multidimensional works.
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