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AIRFLOW RESISTANCE MEASUREMENTS
PURPOSE. Non-destructive determination of the airflow resistance MEASUREMENT PROCEDURE. Non-destructive measurements to
caused by surface texture or porosity in the tyre-road contact patch. be performed in-situ on the road surface. The tyre-road contact is si-
Measurement on site or on test samples in the laboratory. mulated by an elastic ring and an adjusted preload. A constant air volu-
me flow is established and the resulting differential pressure, occur-
ring during the flow through the sample, is measured. The specific air-*MEASUREMENT PROCEDURE. Based on DIN EN 29053: Acoustics flow resistance, R is obtained from volume flow and differential pres-s
– Materials for acoustical applications. Determination of airflow resis-sure.
tance. *NB: The resulting specific airflow resistance R is different from the air-s
flow resistance R as defined in the EN 29053.s
SCOPE OF APPLICATION. Measurement of the airflow resistance of
open-porous road surfaces (both new and after long use), determina-*MEASUREMENT RESULTS. Specific airflow resistance R at a flow ra-tion of the airflow resistance in the tyre-road contact patch of dense s
surfaces induced by the road surface texture. te of 0.0125 m/s.
MEASUREMENT CONDITIONS. In-situ measurements: on dry sur-
faces, at temperatures above 5 °C, the traffic has to be restricted du-
ring the measurements. Laboratory measurements can be performed
on test specimens with a minimum length/diameter of 40 cm.
CONTACT.
Manuel Männel Phone: +49 (89) 85602-204
Mail: [email protected]
Beate Altreuther Phone: +49 (89) 85602-273
Mail: [email protected]
www.MuellerBBM.com
air flow velocity u/(m/s)
0,000 0,025 0,050 0,075 0,100 0,125
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