Transmission loss (TL) is a good performance measure of mufflers since it represents the muffler's inherent capability of sound attenuation. There are several existing numerical methods, which have been widely used to calculate the TL from numerical simulation results, such as the four-pole and three-point methods. In this paper, a new approach is proposed to evaluate the transmission loss based on the reciprocal work identity. The proposed method does not assume plane wave propagation in the inlet and outlet ducts, and more importantly, does not explicitly apply the anechoic termination impedance at the outlet. As a result, it has the potential of extending TL computation above the plane wave cut-off frequency.
Using the Reciprocal Work Identity to Evaluate the Transmission Loss of Mufflers
Sae International Journal of Passenger Cars. Mechanical Systems
Sae Int. J. Passeng. Cars - Mech. Syst
SAE 2013 Noise and Vibration Conference and Exhibition ; 2013
Sae International Journal of Passenger Cars - Mechanical Systems ; 6 , 2 ; 1108-1114
2013-05-13
7 pages
Conference paper
English
Using the Reciprocal Work Identity to Evaluate the Transmission Loss of Mufflers
British Library Conference Proceedings | 2013
|Automotive engineering | 1977
|SAE Technical Papers | 2014
|Development of Transmission Loss Bench for Mufflers Based on the Transfer Matrix Method
SAE Technical Papers | 2016
|Idle relief mufflers and outboard motors having idle relief mufflers
European Patent Office | 2016
|