Dynamics of Buses - Part III

Abstract

Dynamics, or dynamic processes, is the part of mechanics dealing with the study of processes trying to describe as real as possible the movement of a body, element, mechanism, car, etc., also taking into account the action of the forces on the respective system with their influence on the actual movement of system. The present paper aims to present the study of the dynamics of the vehicles, with particularization on the buses. Here are the main elements of the bus dynamics, taking into account all the elements that influence the dynamic operation of a bus, in general and in particular situations, with emphasis on the main systems and elements that act on the actual, dynamic, on a normal path or on an inclined with an alpha angle path. The position of the bus center on a bus needs to be known first in order to study the stability of the bus and then to determine the normal dynamic reactions for the suspension design... The position of the center of mass in the longitudinal plane is determined by weighing the bus on a tiller. In the beginning determine the maximum total mass of the G_t bus and then two other weights determine the loads G₁ and G₂ that belong to the front and to the rear axle. The stability of the bus will be studied, which means its ability not to overturn or slip during travel or in stationary. The longitudinal stability of the bus means its ability not to overturn around the rear or front wheels or to slip longitudinally when climbing a slope. Figure 3 considers a bus that climbs a slope at a low and uniform speed. The movement can be considered because the overturning can occur in the case of large slopes. Flipping around the straight line through the contact points B of the rear wheels with the road may occur when the tipping moment is greater than the moment of stability relative to the same point, i.e.