Linearization of internal and external kinematics interaction of long-based freight wagons for passing small radius curves

Abstract

The possibility of constructive adaptation of the assembly units of the kinematic chain of conjugated parts from the automatic coupler to the wheel-rail contact is considered on the basis of increasing the degree of freedom of the center-to-centre assembly for the train to pass curves of the railway track, including small radius and mountain pass sections. The closedness of the system of loads and the «train - superstructure of the track» influences are taken into account. Particular attention is paid to the applied use of the theory of simple and complex coupled systems with access to a certain design solution to ensure the normative level of traffic safety and positive implementation of the technical and technological resource of railway rolling stock. An approach to solving the problem of increasing the level of situational reliability, wear of an interacting wheel-rail pair based on the principles of an adaptive algorithm, as well as minimizing the probability of an emergency derailment of cars on curves of a small radius is achieved by including an element into a closed system that has an adaptability resource and the safe transfer of a destabilizing influences to another matrix. Since the linearization methods are limited, i.e., the equivalence of the original nonlinear system is preserved only for limited time scales of the system, or for certain processes during the movement of the train, then when switching from one operating mode to another, the adequacy of its linearized model should also be controlled. As an example, a variant of the eccentric articulation of the body with the bogie of a freight car is proposed. The result is valid not only for the studied freight cars, but also for the entire rolling stock using automatic coupling equipment of the SA-3 type. In the applied effective part, a variant of the functional «adaptive» expansion of the junction of the pivot beam of the car frame with the bogie is proposed in order to safely transfer the identified destabilizing effect to the adjacent matrix.