Parametric Study on Dynamic Performance of Transition Section of Steel Spring Floating Slab Track

2020 ◽  
pp. 949-958
Author(s):  
Shuwen Ren ◽  
Congcong Cui ◽  
Deyun Ding
Keyword(s):  
Parametric Study ◽  
Dynamic Performance ◽  
Steel Spring ◽  
Slab Track ◽  
Transition Section

scholarly journals Vertical Dynamic Analysis of Ballastless Tracks on Train-Track- Bridge System

2020 ◽  
Vol 306 ◽  
pp. 02003
Author(s):  
Haoran Xie ◽  
Bin Yan ◽  
Jie Huang
Keyword(s):  
Track Structure ◽  
Vertical Acceleration ◽  
Train Track ◽  
Steel Spring ◽  
Slab Track ◽  
Ballastless Track ◽  
Track System ◽  
Train Speed ◽  
Track Bridge ◽  
Bridge System

In order to investigate the vertical dynamic response characteristics of train-track-bridge system on CWR (Continunously Welded Rail) under dynamic load of train on HSR (High-Speed Railway) bridge. Based on the principle of vehicle train-track-bridge coupling dynamics, taking the 32m simply supported bridge of a section of Zhengzhou-Xuzhou Passenger Dedicated Line as an example, the finite element software ANSYS and the dynamic analysis software SIMPACK are used for co-simulation, and bridge model of the steel spring floating slab track and the CRTSIII ballastless track (China Railway Track System) considering the shock absorbing steel spring, the limit barricade and the contact characteristics of track structure layers are established. On this basis, in order to study the dynamic response laws of the design of ballastless track structure parameters to the system when the train crosses the bridge and provide the basis for the design and construction, by studying the influence of the speed of train on the bridge, the damage of fasteners and the parameters of track structure on the train-track-bridge system, the displacement of rail, vertical vibration acceleration and wheel-rail force response performance are analyzed. Studies have shown that: At the train speed of 40 km/h, the displacement and acceleration of the rail and track slab in the CRTSIII ballastless track are smaller than the floating slab track structure, but the floating slab track structure has better vibration reduction performance for bridges. The acceleration of rail, track slab and bridge increases obviously with the increase of train speed, the rail structure has the largest increasement. Reducing the stiffness of fasteners could decrease the vertical acceleration response of the steel spring floating slab track system, the ability to absorb shock can be enhanceed by reducing the stiffness of the fastener appropriately. Increasing the density of the floating slab can increase the vertical acceleration of the floating slab and the bridge, thereby decreasing the vibration amplitude of the system.

Structural and dynamic performance of an asphalt slab track in a sharp curve

2016 ◽  
Vol 21 (1) ◽  
pp. 315-321 ◽  
Author(s):  
T. Real ◽  
C. Hernández ◽  
F. Ribes ◽  
J. I. Real
Keyword(s):  
Dynamic Performance ◽  
Slab Track ◽  
Asphalt Slab Track

Influence Analysis of Mortar Elastic Modulus to CRTS III Slab Track Vertical Dynamic Response

2012 ◽  
Vol 166-169 ◽  
pp. 314-317
Author(s):  
Zhi Ping Zeng ◽  
Xue Song Wang ◽  
Wen Rong Chen ◽  
Guang Cheng Long
Keyword(s):  
Elastic Modulus ◽  
Dynamic Response ◽  
Elastic System ◽  
Dynamic Performance ◽  
Beam Element ◽  
Total Potential Energy ◽  
Slab Track ◽  
Total Potential ◽  
Coupling Dynamic ◽  
Space Beam Element

A train-CRTS Ⅲ slab track coupling dynamic model was proposed to study the dynamic performance of the system. Rail was modeled as space beam element. Both slab and HGT layer were modeled as plate element respectively. The vertical and lateral connections between rail, slab, HGT layer, and subgrade were modeled as spring-damper element. The vibration matrix equation of the system was established on the basis of the principle of the total potential energy with stationary value in elastic system dynamics and the rule of “set-in-right-position” for formulating system matrices. The influence of mortar elastic modulus to CRTS Ⅲ slab track vertical dynamic response was calculated when the train runs at 350 km/h. The results show that the larger of mortar elastic modulus, the faster the vibration between rail and slab decays, and the slower the vibration between slab and HGT layer decays.

scholarly journals Dynamic Response of a Bridge–Embankment Transition with Emphasis on the Coupled Train–Track–Subgrade System

2020 ◽  
Vol 10 (17) ◽  
pp. 5982
Author(s):  
Ping Hu ◽  
Chunshun Zhang ◽  
Wei Guo ◽  
Yonghe Wang
Keyword(s):  
Dynamic Response ◽  
Rigid Body ◽  
Dynamic Performance ◽  
Coupled System ◽  
Transition System ◽  
Differential Settlement ◽  
Train Track ◽  
Transition Section ◽  
Energy Variation ◽  
Driving Speed

Dynamic response of a bridge–embankment transition is determined by, and therefore an indicator of, the coupled train–track–subgrade system. This study aims to investigate the approach of coupling the train–track–subgrade system to determine the dynamic response of the transition. The coupled system is established numerically based on the weak energy variation, the overall Lagrange format of D’Alembert’s principle and dynamics of the multi-rigid body, which is verified by in-site measurements. With this model, the influence of rail bending, differential settlement and other factors on the dynamic performance of the transition system is analyzed. The results show that when the train driving speed is 350 km/h, basic requirements should be satisfied. These requirements include that the irregularity bending of the bridge–embankment transition section should be less than 1/1000, the rigidity ratio should be controlled within 1:6, and the length of the transition section should be more than 25 m. In addition, the differential settlement should not exceed 5 mm. Among these factors, the differential settlement and the bending of the rail surface are the main ones to cause the severe dynamic irregularity of the transition section. Our analysis also indicates a requirement to strengthen the 18 m and 25–30 m distance from the abutment tail and the bed structure.

A Parametric Study of Journal Bearing Performance: The 80 Deg Partial Arc Bearing

1979 ◽  
Vol 101 (4) ◽  
pp. 486-491 ◽  
Author(s):  
T. Suganami ◽  
A. Z. Szeri
Keyword(s):  
Parametric Study ◽  
Thermal Effects ◽  
Journal Bearing ◽  
Dynamic Performance ◽  
Flow Regimes

The thermohydrodynamic (THD) lubrication model of reference [1], tested and shown to be valid in both laminar and superlaminar flow regimes, is applied here to a series of geometrically similar, but of different size, bearings. The resulting parametric study shows significant thermal effects on both the static and the dynamic performance of the bearings.

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