Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2006.tde-05092006-113355
Document
Author
Full name
Fabio Cardoso Almeida
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Barbosa, Roberto Spinola (President)
Alves, Marcelo Augusto Leal
Santos Junior, Auteliano Antunes dos

Title in Portuguese
Análise das forças de contato e comportamento dinâmico de rodeiro ferroviário.
Keywords in Portuguese
contato roda-trilho
dinâmica veicular
ferrovia
força de contato
sistemas multicorpos
Abstract in Portuguese

Title in English
Analysis of creep forces and the dynamic behavior of wheelset.
Keywords in English
contact force
dynamic
mulbody system
railway
wheel-rail contatc
Abstract in English
Railway dynamics systems are modeled regarding the creep forces between wheel-rail. The equations of movement are strongly influenced by these forces, what requests the knowledge of the theory in mechanical of contact, necessary tool to foresee the behavior of a railway vehicle. The wheelset is responsible by receiving the perturbations of irregularities and transfer them to the primary suspension. A railway vehicle is composed by primary and secondary suspensions. The proposal is based on performing simulations in the time domain, dynamic mresponse of a railway wheelset of two degrees of freedom. The mathematical model is developed. The stiffness of contact and conicity are linearized around an operation point, near to track center. The influence of speed is determined to linearized model and to a range of 0.1 to 1.0 in the conicity. The eigenvectors are presented. In the following, the non linear model of the wheelset is generated using a specialized package of multi body system, VAMPIRE. The package creates equations of movement after the generation of the topology. The non linear mathematical model are defined by the benchmark proposed by International Association of Vehicle System Dynamics (IAVSD). The wheelset is submitted to 20kN at the rail level. In a second case, the wheelset is submitted to a rate of 50kN/s of lateral force until derailing. The determined longitudinal and lateral forces on contact, yaw angle and displacement of the center of gravity of the wheelset, contact angle are compared with the benchmark results and other authors.