A comparison between hybrid method technique and transfer matrix method for design optimization of vehicle muffler

Abstract

Hybrid mufflers are now commonly equipped to decrease vehicle noise and are a crucial tool for regulation of the acoustic system. In order to ensure optimum engine efficiency, the system is intended to dump the strength of the acoustic pulses generated from the engine, and the back pressure created by these systems must be held to a minimum. Typically, modern mufflers have a complex structure of chambers and flow paths. There are a number of mechanisms for sound dampening that operate to silence the sound flowing through a muffler and piping device. This research introduces an important approach to optimize the transmission loss of hybrid muffler Formula student race car (FS) by using both experimental and analytical methods. For this analysis, two methods of calculation were chosen. The muffler has a complex partition located within the muffler chamber, which is a perforated pipe. For the creation of the Finite Element Analysis (FEA) model in AVL BOOST solver and another commercial advanced design software, the muffler CAD file was developed. Experimental measurements using a two-load method validated the FEA model. Reliable tests were conducted to verify the design parameters and optimize the muffler's transmission loss (TL) after the model was checked. The findings of experimental and machine analysis are included in the paper. For different measurement methods, recommendations are made for achieving optimum transmission loss curves.

Investigation of the effects of volume change on flow structure and acoustic in a silencer

“…The study's findings suggested that using sound-absorbing material could lower SPL by 15% to 20%. [13][14][15] For automotive engines, Vasiraja and Saravana Sathiya Prabhahar 16 designed a muffler with perforated inner pipes and nozzles to reduce the sound pressure level. The investigation looked at the effect of convergence angle and nozzle number.…”