Figure 12. Effect of Flow on Sound Transmission loss of optimized 4 chambers muffler at, r1=28.5 mm, and r2=77.6 mm

From

Numerical Assessment and Shape Optimization of Dissipative Muffler and Its Effect on I.C. Engine Acoustic Performance

Sabry Allam

American Journal of Vehicle Design. 2014, 2(1), 22-31