Assessment Of Aerodynamic Noise InAn Industrial Ventilation System

This paper deals with the assessment of aerodynamic noise level generated by an industrial ventilation system. The system incorporates an axial flow fan operating with airfoil rotor blades. Measurements were performed using a modular digital sonometer of high precision, equipped with a microphone and a frequency analyser. The procedure that was followed enabled us to account for both the global level and the equivalent frequency level of noise, in the intermediate range of audible frequencies, using a filter of 1/3 of the octave.