デジタル画像相関法を用いたタイヤの面内ひずみ・面外変位同時計測

摘要

In order to improve performance of anti lock brake system (ABS) and detect condition of road surface, intelligent tires that monitor strain of interior surface and rolling radius of tire are demanded. However, the high stiffness of an attached sensor like a strain gauge causes debonding of sensors from tire rubber. In the present study, noncontact concurrent monitoring method is proposed using digital image correlation method (DICM) and spotlight projection. In-plane strain and out-of-plane displacement (rolling radius) are calculated by using image processing with an image of interior surface of tire that is taken with a single CCD camera fixed on wheel rim. New monitoring system is applied to Al beam and commercially available radial tire. As a result, this monitoring system is proved to be able to measure in-plane strain and out-of-plane displacement with high accuracy, and confirmed to be effective for concurrent monitoring of tires.%近年，自動車のABSの性能向上や路面状態の検知などをrn目的として，タイヤと路面との摩擦係数やスリップ率を計rn測するインテリジェントタイヤの開発が期待されているrn．摩擦係数を知るためにはタイヤに負荷されている荷象rnすなわちタイヤのひずみを計測する必要があり，スリップrn率を知るためには転がり半径の計測が必要となる．