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7 DOF Vehicle Model for Understanding Vehicle Fluctuation During Straight Running
Technical Paper
2003-01-3412
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper concerns an introduction on how to lead the 7 degrees of freedom (7DOF) model for understanding the vehicle-fluctuation during straight running. Despite the steering wheel being fixed at on-center by anchor rod connected to the floor, vehicle run with a very slow lateral fluctuation, of which amplitude is small but becomes maximum at a certain speed zone, was observed by a vehicle test on a flat road of the proving ground. For understanding this phenomenon, I provided the motion equation of the 7DOF model. By analysis using the motion equation, the existence of a speed zone where the amplitude becomes maximum is confirmed. This appears when the rear compliance steer is the proverse compliance steer and disappears by changing it to the adverse compliance steer. Where, the adverse/proverse compliance steer mean the characteristics of compliance steer that increase/decrease the side-slip angle versus the vector direction of the vehicle(1).
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Citation
Momiyama, F., "7 DOF Vehicle Model for Understanding Vehicle Fluctuation During Straight Running," SAE Technical Paper 2003-01-3412, 2003, https://doi.org/10.4271/2003-01-3412.Also In
References
- Momiyama Fujio Yuhara Naohiro Tajima Jun Performance Improvement of On-Center Regulation for Large Sized Vehicles SAE 2001-01-3433
- Momiyama Fujio Sasaki Takashi Nagae Hiroyasu Confirmation of the Natural Yawing Frequency of Large Sized Vehicle –Distinguishing the Vehicle System from the Driver-Vehicle System-, 2001 ASME International Mechanical Engineering Congress and Exposition, November 11-16, 2001 New York, NY, IMECE2001/DE-23259