System analysis of the factors influencing cross-country ability of emergency-rescue vehicle
Keywords:emergency-rescue vehicle, cross-country ability of emergency-rescue vehicle, system analysis of the factors, coupling of tire with a road, device of increase of cross-country ability
Purpose. The research aim is an increase of cross-country ability of an emergency-rescue vehicle.
Methods. The system analysis of the factors influencing basic cross-country ability of fire rescue vehicles is executed.
Findings. Wheel lugs are among the most effective methods for overcoming of icing or snowbound areas. In the presence of lugs on tires, the influence of many of analyzed factors is reduced or eliminated. The ratio of forces in the contact patch, which occurs when the wheel moves, changes dramatically, ensures the grip of the tires with the road, and the vehicle’s cross-country ability increases. The drawbacks of the existing lugs have been revealed: the impossibility of instantaneous installation in case of reducing of tire adhesion and the risk of slipping; and the inefficiency of the preset mounting.
Application field of research. The use of research results will allow minimizing delays associated with overcoming areas with an uncertain road surface and difficult weather conditions when the rescue vehicle moves to the accident site.
Conclusions. A semi-automatic device for improving cross-country ability is under development, which will enable and disable the lugs by pressing a button from the driver’s cab, depending on driving conditions.
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