Mufflers are used to attenuate noise emitted by a combustion engine, for example, and should typically perform well in a specific frequency range. Attenuation is measured through transmission loss, which gives the damping in dB as a function of frequency.The Absorptive Muffler Designer simulation app is used for studying and designing a simple resonant muffler with a porous lining. With the app, you can perform an analysis of both inductive and resistive damping in a muffler of your choosing.The app enables you to study the results after changing the dimensions of the muffler, the ambient working conditions, and the material properties of the porous liner.