Dynamic Response Analysis of an Asymmetric Coupled Vehicle-Track System Generated by Voided Elastic Two-Block Sleeper

Abstract

Based on vehicle-track coupled dynamic theory, a three-dimensional asymmetric vehicle-track coupling vibration model is developed to investigate the effect of voided elastic two-block sleepers on vehicle and track system dynamic responses. For the vehicle system, one car body, two frames, and four wheel sets are assumed to be rigid, with 35 degrees of freedom (DOF). For the track system, the rails and the concrete two-block sleepers are the main vibration components. The rails are modelled as Timoshenko beams, and the concrete two-block sleepers are assumed to be rigid mass with vertical and lateral movement. The pads under the rails and the rubber boots under the sleepers provide greater vertical and lateral elasticity for the track. The Hertz nonlinear elastic contact theory is used to calculate the normal wheel/rail force. The wheel/rail tangent creep force is first calculated using Kalker’s linear creep theory and then modified by the Shen-Hedrick-Elkins theory. The results show that the asymmetric voided elastic two-block sleepers have greater effects on the dynamic responses for fasteners and sleepers than on the car body and the wheel/rail forces under measured geometric irregularity and random irregularity. Two or more voided sleepers will greatly affect the vehicle running safety.

Control of Metro Train-Induced Vibrations in a Laboratory Using Periodic Piles

“…[21] Xu [20] Liu et al [17], Jia et al [18] High resilient rail fastener Fang et al [19] Twin-block booted sleepers Gao et al [22], He and Yang [23] Ladder sleeper track Yan et al [25], Jin et al [26] Ma et al [27] Xia et al [24] FST with steel spring Ma et al [3], Zhai et al [28], Ding et al [29] Ma et al [3], Liu et al [17], Jia et al [18] FST with rubber bearing Yuan et al [30] FST + tuned slab damper/mass block Xu [20], Zhu et al [31,32],…”

“…Multi rows of piles exhibit a better ability to mitigate vibrations due to their periodic arrangement. In recent years, it is Twin-block booted sleepers Gao et al [22], He and Yang [23] Ladder sleeper track Yan et al [25], Jin et al [26] Ma et al [27] Xia et al [24] Sustainability 2020, 12, x FOR PEER REVIEW 2 of 22…”

“…Table 1 summarizes existing research on different types of vibration-isolating tracks. The elastic element can be inserted under the rail [17][18][19][20][21], the sleeper [22][23][24][25][26][27], and the whole slab track [3,17,18,[28][29][30]. The track's natural frequency decreases with the decrease of the elastic element stiffness or increase in floating masses above the elastic elements.…”

Contact Loss beneath Track Slab Caused by Deteriorated Cement Emulsified Asphalt Mortar: Dynamic Characteristics of Vehicle-Slab Track System and Prototype Experiment

“…Model. Because of the complexity of structure and the coupling of vehicletrack system [16][17][18], it is very complicated and timeconsuming to accurately describe the in-service conditions of vehicle subsystem and track subsystem. Therefore, the vehicle-track system needs to be simplified.…”

Performance of railway track system under harmonic loading by finite element method

“…In 2016, Zhenxing He and Xinwen Yang [9], studied the performance of sleepers by coupled vehicle-track system under dynamic loading. Three dimensional models were used for two-block sleeper.…”