Stuttgart friction meter
The Stuttgart friction meter ( SRM for short ) is a test method for measuring the grip of road surfaces. The way it works is based on the principle of “defined locked wheel”. The measuring device consists of a unicycle trailer with a wheel load of 3.5 kN, which is pulled by a vehicle. The wheel in the trailer corresponds to the so-called European standard tire (PIARC tire) consisting of a profile of four longitudinal grooves.
For the measurement, the wheel is blocked while driving (with a water film thickness between 0.5 and 1 mm) and the resulting force is recorded. Alternatively, the measurement can also be carried out with a defined slip . If you then put the determined force in relation to the wheel load, the frictional resistance (grip) can be determined. Different speeds can be used for the measurement.
literature
- S. Velske, H. Mentlein: Road construction technology . Werner Verlag, Düsseldorf 2002, ISBN 3-8041-3875-6 , p. 260 .
Web links
- Further information on the Stuttgart friction meter from the ETH Zurich ( Memento from August 16, 2005 in the Internet Archive )