Adaptation of the Y32 bogie to the different weight of coaches

Rail vehicles undoubtedly stand out when the means of transport compared in terms of comfort, efficiency and safety. Passenger coaches are produced in different types such as sleeping coaches, dining coaches, pullman coaches, etc... to ensure the customer satisfaction. Each of different types of passenger cars are weighted differently because of the changing components. Therefore, the system of bogie that carries the coaches can not show the same secure dynamic behaviour while operating with different weights of coaches. Therefore, aim of this study is to adaptation the bogie system depends on the weight of coaches, in a safe way. Within the scope of the aim, firstly, the adaptation of the Y32 bogie has done, used in newly designed for the BDZ sleeping coaches in Bulgarian railways and on safety against derailment analyses in accordance with TS EN 14363 standard were conducted . Firstly, weight of the coach was determined in design phase by 3D dimensional drawing program, Catia V5.All the components of bogie are checked based on determined coach weight. Primary and secondary suspension systems are the main systems that influence the dynamics of the wagon in elements of the bogie system. In this study depending on the calculated coach weight, helical spring groups and shock absorber groups were redesigned according to new load distribution. Anti-roll bar system which providing stabilization of the coaches in curves and operating with varying weight of coach is the another bogie component. Torsion spring of anti-roll bar system was recalculated according to the varying weight of coach. During operation, large amount of kinetic energy generate on rail vehicles because of having large mass and high speeds. Braking action for vehicles are defined as conversion of the kinetic energy to the heat energy through friction The coach weight is very important parameter for the brake system. Brake system were selected according to calculated coach weight in this study and also safety calculations of the selected brake system were indicated. Dynamic model has been created by Simpack program for the dynamic analysis after recalculation of the bogie parameters. Vehicle-road system is divided into three sub-systems in dynamic analysis model: Body, wheel rail and road contact. The first step in all computer simulations is to set up a physical model of the system for the modelling and the topography is formed. UIC 510-2 S1002 the wheel profile and TS EN 13674-1 UIC60 type rail profile are used for models used in simulations . Wheel and rail profiles are modelled by nonlinear functions. In simulations, KALKER's (FASTSIM) simplified contact model was used to calculate the contact forces. In created dynamic model, the car body and bogie frames, as well as the wheelsets are modelled as rigid bodies and are defined by their mass–inertia characteristics. Primary suspension systems and secondary suspension systems are modelled as linear and nonlinear springs and dampers. Later, modal analysis, the derailment analysis, curve analysis, twist track analysis are performed in SIMPACK software in accordance with TS EN 14363 standard , "Railway applications - Testing for the acceptance of running characteristics of railway vehicles - Testing of running behaviour and stationary tests". In dynamic analyses, Y/Q Nadal criteria and ripaje forces are checked for all the scenarios defined in the standards. As a result of the analysis, safety of weight-adapted bogie has been demonstrated. As a next step of this study, actual values that will be obtained in on tract tests and dynamic analyses made on computer are expected to be confirmed