SEDL / STP / STP1031-EB / STP23363S

Dynamic Behavior of a Vehicle on a Rutted Road

Nakatsuji, T
Lecturer, professor, instructor, instructor, and technician, Faculty of Engineering, Hokkaido University, Kitaku Sapporo,

Kaku, T
Lecturer, professor, instructor, instructor, and technician, Faculty of Engineering, Hokkaido University, Kitaku Sapporo,

Fujiwara, T
Lecturer, professor, instructor, instructor, and technician, Faculty of Engineering, Hokkaido University, Kitaku Sapporo,

Hagiwara, T
Lecturer, professor, instructor, instructor, and technician, Faculty of Engineering, Hokkaido University, Kitaku Sapporo,

Onodera, Y
Lecturer, professor, instructor, instructor, and technician, Faculty of Engineering, Hokkaido University, Kitaku Sapporo,

Pages: 13    Published: Jan 1990

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Abstract

Wheel ruts on paved roads affect the maneuverability of a vehicle and sometimes trigger fatal accidents. At present, however, not enough is known about the cause of this unstable maneuverability on a rutted road. It is the purpose of this paper to provide some information on the dynamic behavior of a vehicle running on a rutted road. In order to evaluate the stability and controllability of a vehicle on a rutted road, we performed various running tests both on a rutted road and on a flat road.

Based on analyses using root-mean-squared (rms) values and the Developing Spectrum, the following conclusions were obtained: (1) RMS values for the vehicular motion on a rutted road are much greater than those on a flat road; (2) low-frequency contents below 1 Hz play an important role in the behavior of the vehicle on a rutted road; (3) visual guidance by ruts occasionally leads to stable straight runnings on a rutted road; and (4) the severer the lane-changing conditions, the larger the interaction between sprung mass and unsprung masses.