Contribución al estudio de los parámetros que definen el frenado mecánico de vehículos ferroviarios

• Autores: Carlos Ferrer Giménez
• Localización: Revista A.I.T., ISSN 0378-3294, Nº. 9, 1976 (Ejemplar dedicado a: Simposio sobre Sistemas de Frenado en Ferrocarril), págs. 33-53
• Idioma: español
• Títulos paralelos:
  • A contribution to the study of the parameters that define the mechanical braking of railway vehicles
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• Resumen

  • The constant increase of travelling speeds and loads per axle which have been adopted by railway administrations over the last few years, determine the increasing levels of mechanical energy to be transformed by any braking system. The considerable influence that the energy degraded by any braking system has on itself has forced us to adopt a new approach to the braking technique. With this in mind, a functional block diagram is established, and parameters may be defined to qualify, by themselves, the performance of each one in every braking system.

    The problem of selecting the braking system for a railway vehicle is analyzed, thus realizing the outstanding importance that mechanical braking possesses.

    New theories have been established, these justifying the response of braking based on the tribology in which the parameters that defined the block functional performance intervened. This theory attempts to demonstrate that the response of mechanical braking is caused, primarily, by instantaneous and accumulated temperature increase developed in the dynamic braking process.

    The tendency is to improve the response of mechanical braking which affects energy dissipation and the response of the transformer block, by means of a mechanism called "self-orientated brake-block hanger" obtaining what is called a fictiocious friction coefficient.

    In order to determine and quantify the parameters which define mechanical braking of the systems normally used in Spain, as well as to justify the architecture of the theories previously laid out, further tests on rail have been planned by MACOSA in collaboration with RENFE and AIT, execution of which is to be performed on two levels: both on vehicle and on braking system, the latter carried out on the basis brake shoewhel over one of the axles.