The safety of a motor vehicle driving on a curve depends on many design parameters related to the vehicle, driving condition and roadway geometry. All of them are responding in one parameter: the rollover limit that a vehicle can reach without rolling. This paper describes a new methodology to predict the lateral acceleration value that produces the rollover of a bus. As a summary, the proposed methodology is based on equations and dynamic test. A set of road tests allow to characterise the dynamic lateral behaviour of the bus. These experimental data with the equations, where the design parameters of the vehicle are represented, give reliable results. From a safety point of view, this method can provide, for commercial vehicles, a reliable dynamic control of their behaviour (the active dynamic control requires some reliable predictions of rollover). The results obtained enable to know beforehand the safety level of a bus, considering exclusively its design parameters. In the future, a comparative study of different models and bus makes can be carried out. Finally, the procedure developed to validate the methodology is quite original as it eliminates the tendency to overestimate the rollover limit with a quasi-static test instead of a dynamic one.The dynamic tests on the road and the mathematical model predict a reliable rollover limit of a bus. The knowledge of this value will increase the safety of these vehicles.
A new methodology for predicting the rollover limit of buses
Neue Methodik der Vorhersage der Kippgrenze von Bussen
International Journal of Vehicle Design ; 34 , 4 ; 340-353
2004
14 Seiten, 11 Bilder, 8 Quellen
Article (Journal)
English
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