Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
ACOUSTIC CHARACTERIZATION OF THE NOISE GENERATED BY TURBOCHARGERS
Submission Author:
Vítor Mourão Hanriot , MG
Co-Authors:
Vítor Mourão Hanriot, Fernanda Christina Teotonio Dias Troysi, José Arthur Gonçalves da Silva Teixeira, Ramon Molina Valle, Oscar Ricardo Sandoval Rodriguez
Presenter: Vítor Mourão Hanriot
doi://10.26678/ABCM.COBEM2019.COB2019-0268
Abstract
Although turbochargers help reducing vehicles pollutant emissions, once compressed air helps in burning less fuel for the same amount of power, they negatively contribute to another problem: noise pollution. Studies about vehicles sound emission have been developed and significant results relating traffic noise and ischemic heart diseases were made, which therefore urges an attention about the noise generated by turbochargers, once this gears can reach high levels of decibels while operating. Thus, it is necessary to characterize the sound intensity generated by turbochargers. This paper presents a method to calculate the intensity generated by turbochargers using a beamformer named Linearly Constrained Minimum Variance, which consists in extracting signals with predetermined angles from the pressure wave signal captured by an array of sensors. The array is composed by two microphones mounted flush to the compressor’s axis and the sensors are set outside of the inlet duct. After the acoustic signal decomposition, the sound intensity level in four compressor operational speeds is presented.
Keywords
noise pollution, Compressor, LCMV beamforming, compressor's noise emission
