HUANG Qiang1,2, HUANG Hongwei1,2, ZHANG Dongmei1,2
JOURNAL OF VIBRATION AND SHOCK. 2018, 37(19): 190-197.
Floating slab track as an effective means is widely applied in urban rail transportation to reduce train-induced vibration.Here, a floating slab was simplified as a mass, an infinite Euler beam and a short beam, respectively.Three dynamic equations for a discretely supported floating slab track were derived using the mode superposition method, respectively.Its vibration responses were numerically solved with Runge-Kutta method.The calculation results showed that a floating slab modeled as a mas or an infinite beam are two extreme cases of a floating slab track model, the calculation result of the actual floating slab track model is between those of the two extreme track models; a floating slab has a critical length, when its length is equal to the critical one, the response result of the long beam-short beam model agrees well with that of the two-long beam model; when the length of a floating slab is very short (0—0.6 m), the floating slab can be modeled as a mass; when its length is larger than its critical length, it can be modeled as a long beam; when a floating slab is a short beam with a finite length, rail deflection and bearing force of the slab decreases with increase in the slab length.The vibration reduction characteristics analysis for floating slabs showed that increasing floating slab length, stiffness of rail pad, and flexural stiffness of floating slab or decreasing floating slab’s support stiffness is an effective method to improve its vibration reduction performance and train running comfort.