Обоснование методики выбора параметров противоюзного устройства

Abstract

At present there is a need to develop a method of braking calculations for rolling stock with antiskid devices. In other words, at the stage of designing the car (carriage) calculations must be produced proving that the planned parameters of antiskid devices will not let the car enter into skidding during braking, while providing sufficient braking performance. The article proposes a method of calculating antiskid devices of rolling stock in order to assess performance of antiskid devices with selected parameters for the carriage. The principle of the proposed calculation is that firstly a value of the coefficient of adhesion between wheel and rail should be determined, where the wheel will start to fail at a given speed of skid (critical adhesion coefficient). Then a value determined at which the adhesion brake factor on the wheelset (ratio of brake force to the axle load) of antiskid device will allow entering into skid with a given speed at the critical adhesion coefficient. This brake friction coefficient will be called valid, and its dependence on the speed - “antiskid curve”. The conclusion on antiskid devices is made by comparisons based on “antiskid curve” with the calculated (theoretical) dependence of the brake coefficient of friction of the car from the speed (adhesion curve of wheels and rails). The proposed approach makes it possible to compare the impact of various factors on the performance of antiskid devices and standardize the requirements for it. On this basis, it is expected to develop a methodology for rational use of antiskid device for a particular type of car. The proposed approach wasn’t used worldwide previously.