This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
DIRECTIONAL STABILITY AND CONTROL OF A FOUR - WHEELED VEHICLE IN A FLAT TURN
Annotation ability available
Sector:
Language:
English
Abstract
The directional stability and control of a four-wheeled vehicle is studied by means of a simplified analysis which takes into account the variation of the cornering performance of the tires with changes in their vertical loading. A detailed investigation is made of the steady, flat turn in order to appraise the effects of turn radius and forward speed on steering characteristics and dynamic directional stability.
The results of exploratory calculations are presented for a vehicle series in which the fore-and-aft location of the center of gravity is varied; also, a variety of tire configurations and inflation pressures are used on the front and rear wheels. It is shown that both turn radius and speed substantially affect the directional stability and control characteristics of the vehicle. In particular, it is demonstrated that calculations based on straight runs are not indicative of the performance in turns. Vehicles displaying acceptable driving characteristics at low speeds and large turn radii may exhibit oversteering and directional instability in tight, high speed turns.
The calculations also bring to light a variety of interesting conclusions regarding the influence of c. g. location, tire tread width, and tire inflation pressure on the directional performance of vehicles.
Recommended Content
Technical Paper | A Theoretical Analysis Concerning the Influence of the Angle of Axes of Inertia on Vehicle Dynamics |
Technical Paper | Dynamics of Four-Wheel-Steer Off-Highway Vehicles |
Technical Paper | Variability of Yaw Calculations from Field Testing |
Authors
Citation
GOLAND, M. and JINDRA, F., "DIRECTIONAL STABILITY AND CONTROL OF A FOUR - WHEELED VEHICLE IN A FLAT TURN," SAE Technical Paper 600208, 1960, https://doi.org/10.4271/600208.Also In
References
- Paslay P. R. Slibar A. “The Motion of Automobiles in Unbanked Curves,” Ingenieur-Archiv 24 1956 4l2
- Segel L. “Theoretical Prediction and Experimental Substantiation of the Response of the Automobile to Steering Control,” Proceedings of the Inst, of Mech. Engrs., Automobile Division 1956 London
- Milliken W. F. Jr Whitcomb D. W. “General Introduction to a Programme of Dynamic Research,” Proceedings of the Inst, of Mech. Engrs., Automobile Division 1956 London
- Dengler M. A. Goland M. Hermann G. “A Bibliographic Survey of Automobile and Aircraft Wheel Shimmy,” WADC Techn. Report No. 52-l4l 1951 Wright Air Development Center, U.S.A.F., Ohio
- Smiley R. F. Horne W. B. “Mechanical Properties of Pneumatic Tires with Special Reference to Modern Aircraft Tires,” NACA TN 4110 1957