Figure 10. Effect of Flow on Sound Transmission loss of optimized 4 chambers muffler. t=1mm, dh =1mm, σ=2%, r1=28.5 mm, r2=77.6 mm and L= [23.9 105.9 00 00 115.9 00 00 115.5 00 00 105.6 25.1]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