This work describes the use of vibro-acoustic numerical modeling for the prediction of an air intake system noise level for a commercial vehicle. The aim of this work it is to assess the vibro-acoustic behavior of the air intake system and the influence of it in the sound pressure level of the vehicle. For the commercial vehicle with 5 cylinders engine, a sweeping from 0 to 350 Hz was done, aiming on verifying the influence of the generated sound pressure level with respect to the engine rotating frequency, i.e., 2nd 1/2 order at 175 Hz and 4200 rpm engine peak rotation, and 5th order at 350 Hz. The results have shown that there is a big potential to influence the radiated sound pressure level for the areas represented by the intake duct, medium duct and air filter. Overall, the acoustic analyses have shown that an increase in stiffness on this zones can reduce the acoustic energy emitted to the exterior. As a conclusion, the use of the Helmholtz resonators close to the turbine region have been suggested to reduce the sound pressure level in the air intake system when sized for specific frequencies, as for example in the range between 50 to 100 Hz, which was verified in the analyses.
Air intake system modeling for vibro-acoustic assessment
Modellierung des Luftansaugsystems für die schwingungsakustische Bewertung
2001
4 Seiten, 3 Bilder, 3 Quellen
Conference paper
English
Development of an Air Intake System Using Vibro-Acoustics Numerical Modeling
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