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Communication Dans Un Congrès Année : 2020

Experimental Study of Air pumping in a Road Cavity

Résumé

This article deals with the experimental identification of the aerodynamic phenomena leading to rolling noise and more precisely the air pumping mechanism accompanied by air resonances when a tyre passes over a road cavity. Dynamic air pressure measurements at the cavity bottom were carried out on a test rig developed at UMRAE. The latter is a reduced scale representation of a smooth tyre rolling on a cylindrical cavity of adjustable depth. Pressure time fluctuations were measured using piezoelectric sensors integrated in the cavity. These fluctuations can be broken down into three phases: a compression phase (during the gradual closing of the cavity), an overpressure phase with cavity resonance (during the total closure) and a release phase with pressure oscillations due to Helmholtz resonance (during the progressive opening). A parametric study was carried out by varying the rolling speed, the applied load and the cavity depth. In contrast to the applied load which only conditions the overpressure phase duration, the rolling speed and the cavity depth have a rather strong influence on air pressure fluctuations. Increasing the rolling speed and/or decreasing the cavity depth increased the overpressure generated at the cavity bottom as well as the pressure oscillations frequency during the release phase. The cavity depth had the greatest e ect on the maximum pressure measured at the cavity bottom especially for the small cavities. This finding could be related to the tyre tread penetration into the cavity causing additional decrease in its volume resulting in stronger overpressure even more significant for shallower depths. It would therefore be interesting to measure this penetration by displacement sensors and use the result in a numerical model to highlight the impact of the cavity volume variation by comparing the measurements with the calculations.
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Dates et versions

hal-03139479 , version 1 (24-06-2021)

Identifiants

Citer

Marianne Bou Leba Bassil, Julien Cesbron, Philippe Klein. Experimental Study of Air pumping in a Road Cavity. e-FA2020, 9th Forum Acusticum, Dec 2020, LYON, France. pp.2513-2519, ⟨10.48465/fa.2020.0119⟩. ⟨hal-03139479⟩
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