To the question of the investigation of motion of the modular three-unit trailer road train in the "car-towing-dolly-axle truck - three-axle semitrailer" in the braking mode

Abstract

An effective means of reducing the number of vehicles while maintaining volumes of freight is the use of trains. In our time, trains are used in many countries of the world. Due to the relative structural simplicity and shorter lengths at the same level of load capacity, and taking into account a number of other advantages, trailed trains have received a significant recognition and are most commonly used in the provision of freight transport.
Given the increasing intensity of traffic on modern highways, it is necessary to increase the safety of vehicles in order to avoid emergency situations, which results in worsening of human health and significant material losses in case of damage to vehicles and goods. This issue is particularly acute in the case of automobile trains, the process of movement and braking which is much more complicated than in individual cars. It is necessary that the braking system allows to regulate the speed of the carriage in a wide range, counterbalance the slides, and also makes it impossible to assemble the parts of the vehicle and its collision with other cars, that is, it provides the appropriate stability.
In view of this, improving the performance of trains in modern conditions of traffic is one of the priority tasks to ensure a high level of safety of their operation with the maximum efficiency of use.
The question arises regarding the prediction of exchange rate stability and the safety of the movement of a trailer with a different technical condition of its braking system and chassis. Taking into account the influence of these factors on the stability of the trains in the production process and in the conditions of operation, forecasting and analysis of its behavior is an important problem that needs a comprehensive solution. For its solution, it is necessary to carry out research of the processes occurring in the running and braking system under the influence of operational factors, to analyze the individual and joint influence of the change in the technical condition of the braking system and the geometry of the suspension on the braking dynamics of the trains.
These circumstances lead to the search for methods for assessing the stability of the trains in the braking mode.
In order to solve this problem, the main kinematic and geometric relations are defined in the paper, and the equation for finding the angles of the wheel drive of the axes of the links during the movement of the modular three-lane trailer car trains in the structure of the "car-tractor - two-axle podcasting trolley - three-axle semi-trailer" in the braking mode is developed.
This will allow in theoretical studies to determine the effect of the layout scheme and the modes of movement of the specified trailer to its stability in the braking mode, taking into account the angles of the axes.
Keywords: trailer; modular tree unit; layout scheme, trailer unit; trailer road train; semi-trailer; wheeled carriage; mathematical model; performance properties; stability; braking mode.