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The paper presents the procedure and the experimental set-up for some functional parameters determination as the noise level, the pressure drop and the temperatures through investigating three different manufacturing solutions for mufflers. An algorithm and a dedicated method have been proposed in order to emphasize more direct the mufflers influence on the engines performances. The procedure equally includes particular cycles of the engine and it is highlighted the relation between the engine operating conditions and the functional parameters of the automotive mufflers. The experimental results emphasize the corroboration between these parameters and contribute to the improvement of the muffler fabrication and design since it is a complex function that affects noise characteristics, emission and fuel efficiency of engine. It was designed a measurement chain for the noise level evaluation of the mufflers. It was also created a measurement chain for the pressure – drop evaluation and temperature distribution on the external surface of the mufflers. Keywords— mufflers, silencer, noise level, sound pressure, pressure-drop, third-octave analysis, temperature measurement, temperature distribution, thermographic images.

PROCEDURE, MEASUREMENT CHAIN AND EXPERIMENTAL SET-UP FOR THE FUNCTIONAL PARAMETERS DETERMINATION OF AUTOMOTIVE ENGINES EXHAUST SILENCER VEHICLES