On Measurement of Road Friction Characteristics in Winter Snowy Region

Ichiro Kageyama (Consortium on Advanced Road-Friction Database)･Atsushi Watanabe･Yukiyo Kuriyagawa･Tetsunori Haraguchi (Nihon University)･Tetsuya Kaneko (Osaka Sangyo University)･Minoru Nishio (Absolute)･Nobuhiro Nitta･Takashi Asai (J-QuAD DYNAMICS)

A simplified road friction measurement device was constructed to measure the transition process from static to dynamic friction based on actual tires, and the equivalent stiffness of the tread, maximum static friction, dynamic friction, etc. were measured on various road surfaces. Next, we applied these results to a brush model to investigate the possibility of estimating the braking force characteristics of tire. As a result, it was shown that peak μ on μ-s characteristics can be estimated with relatively high accuracy during braking.

Relationship between Road Surface and Tire Slippage, and Effects Temperature on Vehicle Exterior Noise during Acceleration

Kazuki Yamaguchi･Naoto Oishi･Takahito Sakuma (Sumitomo Rubber)

Vehicle Exterior Noise During Acceleration is more affected by ground friction vibration noise due to slippage between tyre and road surface than exterior noise during coasting. In this study, the amount of slip between the tyre and the road surface was quantified using a single tyre index and the relationship with the noise value was confirmed.　Furthermore, to confirm the effect of air temperature, the amount of slip was measured at different air temperatures and the relationship between the noise value and the amount of slip was investigated and reported.

Robustness Verification of Elliptical Contact Tire Model

Ryota Nakanishi (Sumitomo Rubber Industries)･Masami Matsubara (Waseda University)･Haruyuki Suzuki (Sumitomo Rubber Industries)･Shozo Kawamura･Daiki Tajiri (Toyohashi University of Technology)

The elliptical contact tire model is a simplified mechanical model that expresses the distribution of contact pressure and lateral stress in the contact plane by considering the contact shape as an ellipse. In this study, we examine whether the elliptical contact tire model can reproduce the distribution of contact pressure and lateral stress during rolling of multiple tires measured under different loads, slip angles and camber angles.

Measurement of Tire Sidewall Deformation Shape by Phase-Locked Loop Imaging

Masami Matsubara (Waseda University)･Seiki Shibataka･Shozo Kawamura･Daiki Tajiri (Toyohashi University of Technology)･Hiroshi Tachiya (Kanazawa University)

This study developed a system that enables measurement of three-dimensional deformed shapes of tires by combining phase-locked loop photography, which can capture images under high-speed rotation conditions, and the stereo camera method. The deformation shape of the sidewall was measured to be different depending on the slip angle and slip rate.