ФИЗИЧЕСКОЕ МОДЕЛИРОВАНИЕ ВЫСОКОТЕМПЕРАТУРНОГО ТРЕНИЯ ТОРМОЗНЫХ ФРИКЦИОННЫХ МАТЕРИАЛОВ

ТРАНСПОРТНЫЕ СИСТЕМЫ

Abstract

Together with technical progress, a necessity for the development of new highly effective and, at the same time, environmentally friendly brake friction materials for the movement intensification, the load-speed increase parameters of the vehicle operation and the assurance of the ecological safety of the environment arises. At present, at developing new friction materials, the working capacity is determined by laboratory, stand and full-scale tests. The development of a technique for the physical modeling of high-temperature friction of brake friction materials by determining the scale coefficients of the transition of parameters
from nature to the model and establishing the relationship between the regime parameters of laboratory and stand tests is an actual task of modern friction material science. The goal of the work is the physical modeling of the processes of high-temperature friction of brake friction materials by determining the scale factors of the transition of parameters from nature to the model and establishing the relationship between the regime parameters of laboratory and stand tests, as well as the experimental verification of modeling. When modeling the high-temperature friction process in the mode of short-time braking, the transition coefficients for the duration of the interval between two loads and the total time of the working cycle are calculated. The results of calculations of scaling transition coefficients by several different basic parameters and boundary conditions are presented, as well as regime parameters and laboratory and bench testing conditions. Based on the selected parameters, comparative laboratory and stand tests were carried out. In laboratory and stand tests, a similar change of friction coefficient and deceleration is observed as a function of friction temperature. The regime parameters of the test equipment established on the basis of the described principles of physical modeling, provide the same conditions for the frictional interaction of the elements of friction pairs in high-temperature conditions.