To determine the braking properties of a vehicle with a partially full tank

Abstract

The increase in the volume of transportation and the expansion of the nomenclature of transported goods require the improvement of the structure and productivity of motor vehicles (ATZ). A significant reserve for improving the efficiency of the use of ATZ is an increase in the number of goods transported by road trains without a significant increase in their number on highways. This problem can be solved with the help of high-tonnage road trains, including multi-link ones. In this regard, one of the most important tasks is

the need to provide such road trains with the required level of braking properties.

The paper shows that with a partially filled tank, the dynamic qualities of wheeled vehicles change due to large shifts in the center of mass of the cargo in the tank, which leads to additional loads acting on the structure of the tank, as well as a significant decrease in the stability, controllability and braking properties of vehicles, which are determined by the normal reactions of the support surface on its wheels (axles). The paper defines the normal reactions of the support surface for different levels of tank filling and for a road train with a rigid load. The division of the internal volume of the tank into separate sections almost does not affect the maximum value of the inertia force in the case of braking of a road train with constant deceleration, but at the same time the frequency of fluctuations of this force is greater. At the same time, the movement of the liquid relative to the tank leads to a reduction in the braking distance. The division of the tank into sections, as well as the degree of its filling, also affect the length of the journey - the shortest in a road train with a single-section tank with 50% filling.

Key words: road train, tank, degree of filling, sectionality of the tank, normal reaction, deceleration, braking distance