Resonance characteristics of two-span continuous beam under moving high speed trains

As a seismic wave travels along the separate supports of an extended structure, the structure is subjected to multiple-support excitation due to seismic wave propagation. Considering the seismic wave passage effect, this paper describes seismic analysis of a maglev vehicle moving on a multiply supported gudieway. The guideway system is modeled as a series of simple beams and the vehicle as a four degrees-of-freedom (DOFs) rigid bar equipped with multiple onboard PI+LQR hybrid controllers. The controller is used to regulate control voltage for tuning both magnetic forces of uplift levitation and lateral guidance in the maglev system. Numerical studies show that as a maglev vehicle is equipped with more supported magnets then they can provide more control gains for tuning the guidance forces of the moving vehicle, and mitigate seismic-induced lateral vibration of a maglev vehicle running a guideway.

Section: Rail Irregularity (M)mentioning

confidence: 99%

Wave passage effects on the seismic response of a maglev vehicle moving on multi-span guideway

Yau

2013

“…A considerable amount of research has been conducted on the dynamic responses of railway bridge/track structures subjected to a moving train (Sun and Dhanasekar, 2002;Liu et al, 2009;Lu et al, 2009;Wang et al, 2010;Kim, 2011;Zakeri et al, 2014;Lei and Wang, 2014;Xu et al, 2015). Such research has been conducted particularly in the past three decades and mostly in relation to the rapid development of high-speed railways worldwide.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Rail-Bridge Coupling Element of Unequal Lengths for Analyzing Train-Track-Bridge Interaction System

Zeng

Liu

et al. 2016

A three-dimensional rail-bridge coupling element of unequal lengths in which the length of the rail element is shorter than that of the bridge element is presented in this paper to investigate the spatial dynamic responses of a train-track-bridge interaction system. Formulation of stiffness and damping matrices for the fastener, ballast, and bearing, as well as the three-dimensional equations of motion in matrix form for a train-track-bridge interaction system using the proposed element are derived in detail using the energy principle. The accuracy of the proposed three-dimensional rail-bridge coupling element is verified using the existing twodimensional element. Three examples of a seven-span continuous beam bridge are shown: the first investigates the influence of the efficiency and accuracy of the lengths of the rail and bridge elements on the spatial dynamic responses of the train-track-bridge interaction system, and the other two illustrate the influence of two types of track models and two types of wheel-rail interaction models on the dynamic responses of the system. Results show that (1) the proposed rail-bridge coupling element is not only able to help conserve calculation time, but it also gives satisfactory results when investigating the spatial dynamic responses of a train-trackbridge interaction system; (2) the double-layer track model is more accurate in comparison with the single-layer track model, particularly in relation to vibrations of bridge and rail; and (3) the no-jump wheel-rail interaction model is generally reliable and efficient in predicting the dynamic responses of a train-trackbridge interaction system.

“…As an example, Wang et al (2010) simulated a two-span continuous beam and obtained the two critical velocities causing the resonance response. By means of numerical models, Lu et al (2013) studied the influence of the bridge-to-carriage length ratio and Yang & Lin (2005) demonstrated that the primary frequencies in the bridge response might be caused by the driving frequencies, which are related to the time the train spent crossing the bridge, and the dominant frequencies, caused by the repeated loads.…”

Section: Introductionmentioning

confidence: 99%

Study of Vibrations in a Short-Span Bridge Under Resonance Conditions Considering Train-Track Interaction

Ribes-Llario

Velarte-González

Perez-Garnes³

et al. 2016

Resonance is a phenomenon of utmost importance in railways engineering, leading to vast damages both in track and vehicles. A shortspan bridge has been modeled by means of a finite elements method model, calibrated and validated with real data, to study resonance vibrations induced by the passage of trains. Furthermore, the influence of vehicle speed and track damping on the vibrations registered on the rail, the sleeper and the bridge has been assessed. Different track and vehicle pathologies have been proposed and their effect on the resonance of the bridge has been evaluated.