Double expansion chamber gives better results as
compared to single expansion chamber. Transmission
loss of double expansion chamber is 42.48 which is
more than requirement and satisfactory. Also Natural
frequency of double expansion chamber is within
range of 583.62 to 1001.1 Hz resulting in no
resonance. By fixing the muffler at first and double
expansion chamber we can increase the frequency and
avoid the resonance. Transmission loss of the muffler
can be increased by adding protrusion pipe at inlet and
outlet. It can be seen that the finite element modal
analysis has certain significance in the study of
vibration characteristics of the muffler. The time
required for optimization of muffler using ANSYS
and MATLAB is very short and can be repeated
simply after changing the input parameters which
provides an easy way to find an optimum solution for
muffler design.