Theoretical Considerations on Restoration and Damping in Yaw Resonance
-The Essence of Resonance and Damping Described by Two Degrees of Freedom of the Angle of Lateral Sliding of the Two Positions-

Hideki Sakai (Kindai University)

Yaw resonance is caused by the rear percussion center’s stabilizing toward its equilibrium position. In relation to the equations of this motion, this report points out Newton's second law at the percussion centers, a feel-back vehicle model using the position variable, the fact that the position is represented by the yaw lead time constant, the fact that yaw angle is defined at the position, an interpretation of the fast response formula at the position, a physical model of the yaw lead time constant, the yaw stabilizing mechanism and the physical meaning represented by the yaw eigenvalue formula and proposes an identification method of the yaw eigenvalues.

Dynamic Roll Center Height and Design

Kouta Tanizaki･Hideki Sakai (Kindai University)

The lower the center of roll, the more ground contact is felt. Therefore, the position of the minimum lateral acceleration of the vehicle body is defined as the dynamic roll center. It is located at the roll axis at zero vehicle speed and approaches the center of gravity at higher speeds. The cause of this is considered as a constraint by the yaw resonance frequency. This constraint was verified by the variation of the real part of the roll root with vehicle speed. The effect of roll damping on this position is also discussed.

Effects of Changes in Specifications Associated with Vehicle Electrification on Steering Characteristic Evaluation

Motoharu Hattori･Masato Abe･Yoshio Kano･Masaki Yamamoto･Makoto Yamakado (Kanagawa Institute of Technology)

Vehicle electrification induces changes in specifications, including a lower center of gravity, reduced pitch and yaw inertia moments, and a rearward shift in the center of gravity. This paper investigates the impact of differences in specifications between internal combustion engine vehicles and electric vehicles on dynamic characteristics. Results from comprehensive vehicle simulations and driving simulator experiments assessing steering performance are presented, providing insights for the improvement of electric vehicle design and driving dynamics.

A Study on Vehicle Cornering Characteristics using Model Considering Differential Mechanism in Rear Wheel

Ikkei Kobayashi･Yusuke Ebashi･Hayato Yamada･Jumpei Kuroda･Daigo Uchino (Tokai University)･Kazuki Ogawa (Aichi University of Technology)･Keigo Ikeda (Hokkaido University of Science)･Mohamad Heerwan Peeie (University Malaysia Pahang)･Hideaki Kato･Takayoshi Narita (Tokai University)

There are three typical differentials that connect the left and right wheels: open differential, locked, and limited slip differential, which affect stability and control when cornering. However, the differentials are generally ignored in vehicle dynamics industry, making it difficult to understand their dynamic behavior. In this report, the effects of the three differentials on cornering dynamics in a quasi-steady-state representation are formulated, including load transfer, to elucidate the dynamics.