ELASTIC SYSTEMS FOR TRACTION AND SHOCK GEAR (SIDE BUFFERS AND CENTRE BUFFERS). THEORETICAL STUDIES OF THE DEVELOPMENT OF LONGITUDINAL FORCES IN GOODS TRAINS EQUIPPED WITH CONVENTIONAL ELASTIC ELEMENTS (FORCE A FUNCTION OF STROKE ONLY)

The influence of the characteristics of the elastic elements on the occurrence, on the development (in time and space) and on the value of the longitudinal forces in trains has been examined for several variants of spring-mass systems. Examination of the braking process has shown that the longitudinal force can be considered as being composed of a "rigid" component, an "elastic" component and a "coefficent of friction" component. With a suitable spring stiffness, combined with a brake-cylinder filling time adjusted accordingly, a "sub-critical development of the longitudinal forces" - and thus a substantial reduction in the values of the maximum longitudinal forces - can be achieved. The development of the longitudinal forces during gradual braking and during starting is also dealt with. The validity of the mathematical model has been confirmed on the basis of the results obtained during tests with actual trains. Future running trials can thus be restricted to an absolute minimum. Finally, the report indicates the optimum spring characteristics for permitting a "sub-critical development of the longitudinal forces" to be obtained during braking.

• Supplemental Notes:
  • Restrictions on the use of this document are contained in the explanatory material.
• Corporate Authors:

  International Union of Railways

  Office of Research and Experiments
  Utrecht,   Netherlands 
• Publication Date: 1972-4

Media Info

• Features: Appendices; Figures; Tables;
• Pagination: 124 p.

Subject/Index Terms

• TRT Terms: Brakes; Braking performance; Cushioning materials; Mathematical models; Train track dynamics
• Old TRIS Terms: Braking systems; Cushioning; Question b36
• Subject Areas: Railroads; Vehicles and Equipment;

Filing Info

• Accession Number: 00052526
• Record Type: Publication
• Source Agency: International Union of Railways
• Report/Paper Numbers: B36/RP 9/E
• Files: TRIS
• Created Date: Jun 24 1976 12:00AM