Design and Geometrical Optimization of Single Expansion Chamber Muffler and Interconnecting Tubes Using GMM

Abstract

Engine exhaust noise can be controlled in the automobile using mufflers. Generally single expansion chamber muffler was used to eliminate the exhaust noise. Considering the exhaust noise and sound pollution there is an urge to develop an optimized design for this muffler for better acoustics performance. Transmission loss (TL) is the important performance parameter of the reactive mufflers. TL is influenced by the geometrical dimensions of the muffler and the frequency of the sound wave passing through the muffler. Plane wave theory is used to analyze the transmission loss of reactive mufflers at low-frequency range since plane wave theory results show close convergence with experimental results. Due to the complexity of analytical equations for complicated geometries using plane wave theory, a generalized matrix method (GMM) is used for analyzing the acoustical behavior of various geometries of mufflers. The objective of this paper is to optimize geometrical Parameters like length and diameter of a single expansion chamber with an interconnecting tube for maximum transmission loss.