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The effect of buffering noise in passenger car

2015; Acoustical Society of America; Volume: 137; Issue: 4_Supplement Linguagem: Inglês

10.1121/1.4920231

1520-9024

Miguel Mauricio‐Iglesias, Ismael Lengua Lengua, Larisa Dunai,

Aerodynamics and Fluid Dynamics Research

This paper presents the effect of buffering noise in passenger cars in real conditions at variable speed. At 25% of opened back window, the effect of buffering noise is not perceived. When increasing the aperture of the window to 50%, is perceived the creation of the buffering noise effect with resonance frequency = 15.6 Hz at speed = 80 km/h, but is not irritating because the pressure level is low, pressure level = 110.2 dB. At 75% of the window aperture appears two air flows in the inside car: the one coming from the superior part of the superior zone of the inside and another one from the central zone of the inside. The effect of buffering noise is clearly perceived with resonance frequency = 16.4 kHz at speed = 80 km/h and pressure level = 119 dB and 19.5 Hz at speed = 110 km/h and pressure level at 122 dB. At speed higher than 103–140 km/h, the buffering noise disappears, depending on the car model. For Opel Corsa, the effect of buffering noises appears at the same speed range, whereas for Peugeot and BMW models, it appears three ranges, one from the buffering noise creation, persist in another range, and disappear in the third range.