No abstract

Objectives: Measuring transmission loss of a muffler in a lab setting ideally requires an anechoic termination at one end, and hence turns out to be tedious. Simulation gives the freedom of changing the geometry of object without destructing it. Methods: Lab grade expansion chamber mufflers are remodelled into extended tube expansion chamber mufflers using simulation. Furthermore, applying end correction helps in optimizing their geometry. The same technique is extended to concentric tube resonators by varying the porosity handle. Findings: With simulation, number of parameters can be changed multiple times by keeping other handles constant. Novelty: Lab grade mufflers are to be modified with non-destructive method for getting improved performance. Hence, to check and optimise the parameters, the present dimensions of lab grade mufflers are kept constant and the results are checked using simulation technique.