NOISE ANALYSIS INSIDE AN ELECTRIC VEHICLE DURING A RUN UP ON THE ROAD AND ON THE CHASSIS DYNAMOMETER

Marius MORARIU, Iulian LUPEA, Colin ANDERSON

Abstract


Acoustic tests were made on an electric car operating on the road and on a roller bench in order to analyze the noise inside the passenger compartment generated during acceleration. Waterfall diagrams of the sound pressure level were plotted with fixed sampling and tracked against the rpm of the motor. It was concluded both from the tests and from the analysis that the car was rather quiet, and most of the noise came from tire-road interaction and from the aerodynamic turbulences. Along with this broadband noise, some tones were detected, corresponding to the 24, 48 orders of the electric motor. Order sections were extracted from the waterfall diagrams. The orders from the two tests were compared and the differences analyzed with respect to the environment conditions. The noise from the chassis dynamometer raised the pressure level of the order related phenomenon and a semi-stationary averaging was applied to lower it.

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References


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*** ISO 5128:1980 - Acoustics - Measurement of noise inside motor vehicles.

*** LMS Test.Lab, LMS International, Leuven, Belgium


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