Klimenko I. Development of theoretical principals and evaluation methods and increasing of movement safety of the rolling stock.

This thesis is dedicated to the railway rolling stock safety by improvement of railway underframe constructions. Criteria of safety from wheel pair run of the rails was obtained. In this case the wheel pair is considered as a single whole and the forcel applied from boogie frame are taken into consederation. The double effect of frame force action on the wheel pair is determined. This action takes place during the ridge vertical slipping relatively the rail head. The behaviourof the wheel pair possible movement during the running on wheel ridge slipping relatively the rail was determined. It is proposed to determine the level of safety from run of the rail as the relation of projections on the force generating which causes the ridge slipping down ward to the forces preventing this movement. This statement, as the author is more precise than the relation of vertical and horizontal cross forces acting on the wheel. The graph presentation of Nadal criteria is given which helps to explain the absence of run of the rails when this criteria is not fullfiled. It is shown that safety criteria from the run of the rails where the side or guide force is used are equivalent. Based on the analysis of the structure schemes the recommendations how to improve the elements connections of the rolling stock are formulated for electric locomotive DC3 and the typical boogie model 18-100 of the carge car. To control friction force and moment of the resistance force to the boogie turn relatively the car body the sketch projects of stands are presented which give the possibility to determine both the frictional force in slides and the frictional force and it's moment during the boogie wobble relatively the body in plan.