The stability of the motions in the horizontal plane of most types of rail vehicles depends to a large extent on the nature of the structure connecting the wheelsets. If the number of wheelsets n = 2 then the conditions for dynamic stability lead to connections which do not allow the individual wheelsets to adopt a radial position in curves. For n ≥ 3 mechan˚isms can be conceived which satisfy the conditions for dynamic stability as well as those for perfect curving. For this class of systems the ability to follow freely any track geometry leads to an additional condition. With this it is found that all relevant properties of the interwheelset connections are completely defined by two square matrices, both n × n: the “steering matrix” representing the kinematic nature and the “reduced stiffness matrix” representing the elastic nature of the connections.
For n= 3 only one, unique, form of the steering matrix will allow perfect steering in curves. Also for n=3 the number of independent parameters in the reduced stiffness matrix is limited to 4. It is found that a certain relation should exist between these parameters in order to avoid instability of periodic and aperiodic motions, particularly for low values of the wheel conicity.
A THEORY ON MULTI-WHEELSET SYSTEMS, APPLIED TO THREE WHEELSETS
Vehicle System Dynamics ; 15 , sup1 ; 233-249
1986-01-01
Article (Journal)
Electronic Resource
Unknown
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