Implementation device for measuring water depth at proving ground test track

Abstract

Tires adhesion on the wet surface between the road surface and vehicle tires is one of the requirement from ECE Regulation No.117 for tires sold in European countries. When tested on a specified test track, tires will be tested and compared the test results with standard reference test tires (SRTT). As a result, the performance index from measured tires is given and indicated by a wet grip index (G). ECE Regulation R117 specifies the wet grip index at a level of water depth between 0.5 and 1.5 mm on the test track surface [1]. The measurements can be done using a simple 150 mm steel ruler with the graduation of 0.5 mm. Before measuring, the tip of steel ruler is polished with Kolor Kut to show the different color when ruler tip is dipped into the water perpendicularly. Then record the data for monitoring the water depth of the test track. Since ECE Regulation R117 specifies the water depth at 1.0 mm +/- 0.5 mm, then it will need a measuring device which has a graduation of less than 0.5 mm. For this reason, we develop a tool for measurements water depth which able to show measurements of one-tenth of a millimeter.