Standards have limited the allowable noise levels in different situations, requiring the study of solutions at the source, in the path or the receiver. Muffler is the major factor influencing the noise of rotary compressor. Control and analyze the acoustic characteristics of muffler is essential. Porous materials have been studied and widely applied to reduce aircraft and vehicular noise or ind...

background: noise is one of the most important harmful agents in work environment. noise pollution in oil refinery industries is related to workers' health. this study aimed to determine the overall noise pollution of an oil refinery operation and its frequency analysis to determine the control plan for a vent noise in these industries. methods: this experimental study performed in control unit...

For an engine running at a constant speed (RPM), the exhaust process and intake process are periodic. This enables use of the frequency-domain analysis of the essentially linear exhaust system consisting of the exhaust runners, manifold, exhaust pipe, the muffler proper and the tail pipe. Over the last forty years, transfer matrices have been derived for use with aeroacoustic state variables as...

Nowadays, creating an environmentally reliable car by reducing the volume of harmful gases in it is a global problem mankind. For this reason, one main areas research to improve exhaust gas cleaning system internal combustion engines. However, date, there are no universal designs that would performance purification system. In regard, development new vehicle based on effective method urgent task...

Internal combustion engines and blowers frequently utilize silencers to reduce exhaust noise. In the current paper, transmission loss of reactive is predicted using plane wave decomposition method a three-dimensional (3-D) time-domain computational fluid dynamics (CFD) approach. A mass-flow-inlet boundary condition first used perform steady flow computation, which serves as an initial for two s...

*Fellow of the International Institute of Acoustics and Vibration, Author for correspondence: Email address: [email protected] 1 Three-Dimensional Acoustic Analysis of an Elliptical Chamber Muffler with a Side Inlet and a Side Outlet A. Mimani and M.L. Munjal* Facility for Research in Technical Acoustics (FRITA), Department of Mechanical Engineering, Indian Institute of Science, Ba...