SOLUTION OF SOME DIRECT AND INVERSE PROBLEMS OF RAILWAY VEHICLE DYNAMICS

On the basis of numerical solution of a three-dimensional contact problem of stationary wheel rolling over rail the modified nonlinear model of creep force is suggested taking into account a change of interaction conditions as compared with usually taken ideal ones. The modified model of creep forces, based on non-Hertz's solution data takes into account the lateral displacement of contact patch on the rail head, a change of the normal wheel pressure on the rail, a wear of the bodies being in contact etc. The way of taking into account of a spread in values of statistical characteristics of random disturbances acting on a transport vehicle is presented. The technique is suggested for decreasing amount of computation to a greater extent in comparison with Monte-Carlo method when distribution law of railway vehicle nonlinear model responses is deduced to a random disturbance having arbitrary distribution. Brief characteristics of suggested programs are given for solving different direct problems of the railway vehicle statistical dynamics using IBM PC. The algorithm of identification of random disturbance characteristic parameters and identification of some track integral parameters for the given construction and the known vehicle parameters are stated. Besides the algorithms of identification of the creep coefficient and the parameter of the equivalent wheel conicity on the basis of the vehicle dynamic test data are described.