Stability assessment of rail vehicles is probably the most diversified type of dynamic analyses in railway vehicle assessment. Various feasible methods exist with which computer analyses of running stability can be carried out. On the one hand, these consist of linearized analyses of the eigenvalues and on the other hand, non-linear simulations, which can also be realized with varying types of exitation and also assessed acording to differing criteria. This article compares the linearized and non-linear methods of running stability assessment, as they are used in railway engineering. It is demonstrated that both the results of the linear and non-linear calculations can exhibit perceptible dispersion at one value of equivalent conicity. The comparison are carried out on two vehicle types, for different calculation methods and wheel/rail contact conditions. It is shown that by applying a minimum damping of 5% and full creep coefficients of Kalker's linear theory, the linear critical speeds are below the non-linear critical speeds, allowing the application of linearized calculations in preliminary investigations in an early project phase. For the application of the linearized stabilty calculations in the industry, conservative parameters are recommended, so that the results are on the safe side when compared with the non-linar calculations. The verificational calculations should be carried out using more exakt non-linear analyses. These investigations and conclusions concern only vehicles without friction elements. In any case, vehicles with friction elements are not suitable for linearization, and stability assessment can only take place by way of non-linear calculations.
Comparability of the non-linear and linearized stability assessment during railway vehicle design
Vergleichbarkeit der nichtlinearen und linearisierten Stabilitätsbewertung beim Entwurf von Eisenbahnfahrzeugen
2006
10 Seiten, 8 Bilder, 15 Quellen
Conference paper
English
Comparability of the non-linear and linearized stability assessment during railway vehicle design
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