To provide a method of evaluating a tire grounding condition with high accuracy from a correlation between a tire contact area and a friction coefficient during traveling on a wet road surface.SOLUTION: A tire ground condition evaluation method includes the steps of: measuring a load when a rubber test piece is pressed through a fluorescent liquid against a ground contact surface having irregularities equivalent to an actual road surface provided on one surface of a transparent plate and is moved linearly while sliding, and a friction coefficient between the ground contact surface and the rubber test piece; irradiating the fluorescent liquid interposed between the ground contact surface and the rubber test piece with excitation light from the opposite side of the transparent plate to the ground contact surface to measure the luminance distribution of the fluorescence emitted from the fluorescent liquid; obtaining a binarized image by using an arbitrary luminance as a threshold on the basis of the obtained luminance distribution to determine a contact area; and obtaining an increase or decrease in the contact area from a difference between two or more types of binarized images in which measurement parameters are different from each other.SELECTED DRAWING: Figure 2
【課題】湿潤路面における走行時のタイヤ接触面積と摩擦係数との相関関係からタイヤ接地状態を高精度で評価する方法を提供する。【解決手段】透明板の一方の面に設けた実路面相当の凹凸を有する接地面に、蛍光液を介在させてゴム試験片を押し当て、すべらせながら直進移動させたときの荷重を計測し、接地面とゴム試験片との摩擦係数を測定する工程と、透明板の接地面とは反対側から、接地面とゴム試験片との間に介在する蛍光液に対して励起光を照射し、蛍光液から放出された蛍光の輝度分布を測定する工程と、得られた輝度分布を基準に、任意の輝度を閾値とし2値化画像を得て接触面積を求める工程と、測定パラメータの異なる2種以上の2値化画像の差から接触面積の増減を求める工程を有するものとする。【選択図】図2
TIRE GROUNDING CONDITION EVALUATION METHOD
タイヤ接地状態評価方法
2019-05-16
Patent
Electronic Resource
Japanese
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