Abstract Wheel–rail system excitation is the root cause of vibrations of vehicle–track coupled systems. It is necessary to reveal the pattern characteristics, model description and input method of the wheel–rail system excitation. In general, the wheel–rail system excitations can be divided into deterministic excitations and nondeterministic excitations. Nondeterministic excitations mainly refer to track random irregularity. Deterministic excitations are induced by some specific factors of vehicle and track systems. The factors from vehicles are relatively simple, mainly including wheel flats, out-of-round wheels, and eccentric wheels, etc. The factors from tracks are more complicated, not only because of track geometry state, such as rail dipped joints, rail dislocation joints, track geometry irregularities, and rail corrugation, etc., but also due to track structure defects, such as sleeper voids (unsupported sleepers), sudden change of subgrade stiffness, etc. According to their characteristics, the author divides the wheel–rail system excitations into four categories, they are the impact excitation, harmonic excitation, dynamic stiffness excitation, and random excitation. This chapter presents the excitation input method and modeling of these four types of excitations.
Excitation Models of Vehicle–Track Coupled System
Vehicle–Track Coupled Dynamics ; 151-202
2019-09-01
52 pages
Article/Chapter (Book)
Electronic Resource
English
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