EVALUATION OF RAILWAY SYSTEMS DYNAMICS BY MODEL ADJUSTMENT
In this thesis parameter estimation is applied to the random lateral motions of railway vehicles. A mathematical model describing these motions is given, with independent parameters for all terms which can be related to wheel-rail forces. This includes creep coefficients, the equivalent conicity and the gravitational stiffness parameter, for which theoretical values can be derived. However, the validity of these values in the case of worn wheel and rail surfaces needs experimental investigation. This can be done by simulating the lateral motions with a hybrid computer model, using the measured rail position as input. Model adjustment, by a variation of creep coefficients and other uncertain parameters, yields the parameter values for which an optimal correspondence between model output and measured vehicle response is reached. Most of the resulting parameter estimates reasonably with their theoretical values. This validates the theory and the structure of the mathematical model. However, two parameters have estimates whose values cannot be explained with theory. These parameters have a great impact on the stability and are indispensable for a proper description of the motions. The satisfactory correspondence that was obtained between experiments and an adjusted model justifies the conclusion that a model with adjusted parameter values can be used reliably for the design of new vehicles.
Proefschrift T.h.Delft, Netherlands
- Broersen, PMT
- Publication Date: 1976
- Pagination: 111 p.
- TRT Terms: Creep; Dynamics; Mathematical models; Motor vehicles; Rail (Railroads); Stability (Mechanics); Train track dynamics; Wear; Wheels
- Uncontrolled Terms: Lateral dynamics
- Old TRIS Terms: Creep coefficient
- Subject Areas: Railroads; Vehicles and Equipment;
- Accession Number: 00139474
- Record Type: Publication
- Source Agency: International Union of Railways
- Files: TRIS
- Created Date: Oct 26 1976 12:00AM