Road-holding: Difference between revisions
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== See also == |
== See also == |
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* [[Automobile handling]] |
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* [[Cornering force]] |
* [[Cornering force]] |
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* [[Directional stability]] |
* [[Directional stability]] |
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Revision as of 18:05, 21 March 2021
Road-holding – also written as Roadholding and Road holding – (in French being called "tenue de route", in German "das Halten der Spur"), or road behavior, is essentially determined by the ability of a vehicle to stay on the road and on a desired trajectory of motion, whatever the circumstances (in curves, on greasy, wet or low-grip ground, loaded or not, etc.) may be, but also by the degree of ease that a driver may sense in controlling it in an emergency situation.[1] (Hereby, the laws of nature as a framework, including the gravitational field of the planet „Earth“ as well as the phenomenon of inertia, are tacitly assumed as given.)
In the above context, the straight-line stability of a vehicle – which is concomitant with its ability to stay on a desired trajectory of motion – necessitates a certain degree of understeering.[2]
The capability to smooth down the road imperfections, affects both the comfort and the road-holding of a vehicle. To improve comfort in this regard means, basically, to limit the vertical acceleration fluctuations of the vehicle body and hence of passengers. To improve road-holding means, among other things, to limit the fluctuations of the vertical force that each tire exchanges with the road. Therefore, modeling and simulation using realistic suspension-damping models, taking the vehicle tires into account, offer a straight-forward opportunity for road-holding improvement of vehicles.[3] Optimization techniques for this purpose are also known.[4] The application of inerters is a very new possibility in this regard, although this technology is more destined to race cars than to ordinary vehicle applications.[5]
As a more sophisticated means for improving road-holding, active suspension – involving sensors, actuators and microcontrollers – may also serve.[6]
For vehicle speeds above approximately 40 meters per second, the effects of aerodynamic forces of an automobile (that is not designed in a too odd way) tend to become sensible for its road-holding.[7]
See also
References
- ^ Campbell, C.: Automobile suspensions. Chapman&Hall, London 1981, pp. 105 f.
- ^ Campbell, C.: Automobile suspensions. Chapman&Hall, London 1981, p. 106.
- ^ Guiggiani, M.: The science of vehicle dynamics: handling, braking, and ride of road and race cars. 2nd edition. Springer, Cham [2018], ISBN 978-3-319-73219-0, pp. 417-460.
- ^ Shirahatti, A., Prasad, P. S. S.: Optimal design of passenger car suspension for ride and road holding. In: Journal of the Brazilian Society of Mechanical Sciences and Engineering. Vol. 30, Fasc. 1, pp. 66-76, 2008.
- ^ Guiggiani, M.: The science of vehicle dynamics: handling, braking, and ride of road and race cars. 2nd edition. Springer, Cham [2018], ISBN 978-3-319-73219-0, p. 426.
- ^ Bharali, J., Garg, N.: Efficient ride quality and road holding improvement for active suspension system. In: 14th IEEE India Council International Conference (INDICON), December 15-17, 2017, Roorkee, India. IEEE 2018, pp. 1179-1184.
- ^ Doniselli, C. et al.: Aerodynamic effects on ride comfort and road holding of automobiles. In: International Journal of Vehicle Mechanics and Mobility. Vol. 25, Issue Suppl. 1, pp. 99-125, 1996.
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