1988 Fiscal Year Final Research Report Summary
DYNAMIC BEHAVIOR OF A VEHICLE ON A RUTTED ROAD
| Project/Area Number |
60460164
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
交通工学・国土計画
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| Research Institution | Hokkaido University |
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Principal Investigator |
KAKU Terutoshi Faculty of Engineering, Hokkaido University, 工学部, 教授 (40001135)
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| Co-Investigator(Kenkyū-buntansha) |
HAGIWARA Toru Faculty of Engineering, Hokkaido University, 工学部, 助手 (60172839)
KAWAMURA Akira Civil Engineering Department, Hakodate Technical College, 講師 (30149893)
FUJIWARA Takashi Faculty of Engineering, Hokkaido University, 工学部, 助手 (50109493)
NAKATSUJI Takashi Faculty of Engineering, Hokkaido University, 工学部, 講師 (60123949)
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| Project Period (FY) |
1985 – 1987
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| Keywords | Wheel Ruts / Vehicle Dynamics / Running Tests / Stability / わだち事故 |
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| Research 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 research 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 RMS (Root Mean Squared) values, the Developing Spectrum, and a computer simulation model, the following conclusions were obtained.
1. The RMS values of steering variables for a rutted road are several times as large as those for a flat road.
2. The lateral displacement at sprung, which results from the rigid body motion and has a frequency content below 1Hz, plays an important role in unstable steering on a rutted road.
3. The effects of wheel ruts on lateral motion become more significant with running speed increased.
4. The harder the lane-changing conditions, the larger the effects of sprung motion on lateral unsprung motion.
5. Another likely cause of difficulty in steering on a rutted road may be the unstable delay of response of the vehicle motion to steering.
6. The computer simulation model developed here, though some modifications are required, seems to be effective in analyzing vehicle motion on a rutted road.
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