CONSTRUCTIONAL ARRANGEMENTS FOR IMPROVING THE RIDING STABILITY AND THE GUIDING QUALITY OF ELECTRIC AND DIESEL LOCOMOTIVES AND VEHICLES. COMPARISON OF THREE MEASURING METHODS FOR DETERMINING THE FORCES EXERTED BY THE WHEELS OF A MOTIVE POWER UNIT ON THE RAILS IN A CURVE OF 300M RADIUS (GIORNICO 1957)
In order to make a comparison between the measuring methods developed by the NS and the SJ for determining the forces occurring between wheel and rail, comparative tests were carried out on a curve of 300 m radius on the Gothardline in October 1957. For these tests the following measuring apparatuses were used: one measuring rail of the CFF; six measuring base plates of the NS; six measuring base plates of the SJ. For an initial series of tests, the measuring rail was laid on six adjacent sleepers fitted with the measuring base plates of the NS and, for a second series of tests, on six adjacent sleepers fitted with the measuring base plates of the SJ. The measuring rail was secured to the other sleepers by means of the usual CFF fastenings. The forces indicated by the CFF measuring rail on the one hand and by the NS measuring baseplates and the SJ measuring baseplates on the other hand, were determined at various speeds and compared with each other. Considerable differences were shown by the lateral forces determined in this way, by means of the measuring rail and the measuring baseplates of the NS and the measuring rail and the measuring baseplates of the Sj, respectively. Better agreement was displayed by the vertical forces, though, in this case, comparison was only possible between the measuring rail and the measuring baseplates of the NS (the measuring baseplates of the SJ not being designed for the measurement of the vertical forces). The considerable differences between the measured values were considered to have been caused chiefly by the mutual influence of the measuring rail and the measuring baseplates of the NS and the measuring rail and the measuring baseplate s of the SJ respectively, on each other. Since the test arrangement used at Giornico - measuring rail laid on measuring baseplates - did not prove satisfactory, it is suggested, when making comparative tests in the future, to have the three methods of rail measuring equipment arranged at adjacent sites on a curve. The relationship between the values supplied by the three measuring methods should be established with the aid of a fourth measuring method, e.g. by means of directly measuring on the wheel of the vehicle under test the forces exerted on the rails (as already developed by the SJ to a certain degree of perfection).
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International Union of RailwaysOffice of Research and Experiments
- Publication Date: 1960-11
- Features: Appendices; Figures; Tables;
- Pagination: 14 p.
- TRT Terms: Car wheels (Railroads); Flanges; Force; Instrumentation; Locomotives; Measuring instruments; Rail (Railroads); Railroad tracks; Tests; Train track dynamics; Vehicle design; Wheels
- Old TRIS Terms: Locomotive design; Question b10; Track response investigations; Wheel flange forces
- Subject Areas: Design; Railroads; Vehicles and Equipment;
- Accession Number: 00052682
- Record Type: Publication
- Source Agency: International Union of Railways
- Report/Paper Numbers: B10/RP 4/E
- Files: TRIS
- Created Date: Jul 8 1994 12:00AM