By H. C. A. van Eldik Thieme (auth.), Donald F. Hays, Alan L. Browne (eds.)
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Extra info for The Physics of Tire Traction: Theory and Experiment
Example text
Amplifying and recording instrumentation for tri-axial force measurement. S. 2 SOUTHEAST Fig. 19. Rainfall in United States. directly in analog form to a tape recorder (see Fig. 18) and simultaneously read out visually by a Visicorder. -lb. on the test track. Water Depth Study on Pavements - The goal of the water depth study on pavements was to determine the probability of expected water depths that could be encountered during wet driving conditions. References p. 57 40 R. W. YEAGER The conterminous United States was divided into seetors with a representative rainfall intensity selected over various return periods.
This situation is analogous to actual real world wet driving conditions. Hamkins Does the mass transfer of water into the contact area from the tire itself begin to have an effect on the watcr depth as the speed goes up? And how then do you functionalize that effect, if in fact you can, or if it ever has been? Pottinger We are aware that this happens. We havc done some photographic studies of the way the water is transferred around the tire, sort of entrained by the tire, if you will, but at the present moment we have no definite statement on this subject.
X z 0 ..... u 60 a::: LL. LL. 0 ..... 060 IN. ~ V PEAK / T --- - r-- SLIDE 40 _.. - \ U LL. LL. W 0 u SURFACES 20 ---o 20 40 60 BRUSHED CONCRETE MACADAM 80 100 TEST SPEED (MPH) Fig. 13. Peak and slide values for 1,60-15 bias tire vs. test speed. The fact that the peak and slide braking coefficients do not decrease with speed for a wide bias tire with extra wide grooves suggests that any decrease in these coefficients with increased speed is largely a result of tin~ viscous and dynamic hydroplaning.