Dynamic Modelling of Railway Track and Wheelsets,
CAMBRIDGE UNIV (ENGLAND) DEPT OF ENGINEERING
Pagination or Media Count:
Our understanding of the dynamics of railway track and of the wheels and vehicles which run over it has increased enormously in the last decade. This development has been demanded by railway administrations themselves faster trains require better standards of track, but have also caused damage of unforseen severity. This damage has arisen largely from dynamic loading caused by wheelflats, railjoints, dipped welds, corrugation, poorly ballasted sections of track and the like. An understanding of track movement can suggest improved designs of track and ways in which present maintenance costs can be reduced. The development of more sophisiticated mathematical models of track and wheelset has been made feasible by the computing resources which are now commonly available, but need not always be exploited to their fullest extent. The purpose of this paper is to discuss some of the developments which have been made in modelling the system of vehicle and track, what results and conclusions have been drawn from these investigations, and some areas in which is inadequate. The emphasis here is on the vertical dynamic response, although consideration is also given to lateral and longitudinal dynamics. It is important to the practising engineer who has an inelastic timetable and meagre computing resources to know when the sophistication of complex models is unnecessary this paper discusses what should be included in a model and what is superfluous.