Comparison of Vertical Model and Spatial Model for Vehicle-Track-Bridge Coupling Vibration System

2011 ◽  
Vol 243-249 ◽  
pp. 4307-4310
Author(s):  
Yuan Zhang ◽  
Wei Lin ◽  
Ze Ming Wang
Keyword(s):  
Vertical Vibration ◽  
Coupling Vibration ◽  
Spatial Coupling ◽  
Advantages And Disadvantages ◽  
Vibration Model ◽  
Spectrum Density ◽  
Exciting Source ◽  
Vibration Responses ◽  
Track Bridge ◽  
Bridge System

In this paper, models for vertical and spatial coupling vibration of vehicle-track-bridge system are established separately. The track vertical irregularity sample in time domain is established by power spectrum density and taken as the exciting source to analyze the coupling vibration of vehicle-track-bridge system of two models. The advantages and disadvantages and applicability of the vertical vibration model and the spatial vibration model are analyzed by comparing the vertical vibration responses of the two models under excitation with same level of track vertical irregularity.

Spatial Coupling Vibration of Vehicle-Track-Bridge System due to Different Track Irregularities

2011 ◽  
Vol 255-260 ◽  
pp. 1735-1739
Author(s):  
Yuan Zhang
Keyword(s):  
Power Spectrum Density ◽  
Coupling Vibration ◽  
Spatial Coupling ◽  
Spectrum Density ◽  
Exciting Source ◽  
Vibration Responses ◽  
Track Irregularity ◽  
Track Bridge ◽  
Track Irregularities ◽  
Bridge System

Track irregularity is one of the most important factors that induce vehicle-track-bridge coupling vibration. In this paper, spatial model of vehicle- track-bridge system is established. The track irregularity sample in time domain are established by power spectrum density and taken as the exciting source to analyze the spatial coupling vibration of vehicle-track-bridge system. By comparing the vibration responses of the model excited by vertical profile irregularity and the model excited by four different irregularities, the change of track irregularities have mostly influence on the vibration of the parts above the rail and nearly no influence on the parts under the rail and bridge.

Effect of Wheel Pressure on Vibration of Straddle Monorail Transit Vehicle-Bridge System

2014 ◽  
Vol 919-921 ◽  
pp. 542-546
Author(s):  
Guo Liu ◽  
Bo Jang ◽  
Zhi Hui Zhou ◽  
Qing Yuan Zeng
Keyword(s):  
Steering Wheel ◽  
Transit System ◽  
Coupling Vibration ◽  
Spatial Coupling ◽  
Lateral Response ◽  
Vibration Model ◽  
System Vibration ◽  
Bridge System

The monorail beam (Z206-25) of Chongqing straddle monorail transit system was selected as the research object. The spatial coupling vibration model of vehicle-bridge system was established and corresponding procedure was compiled. The effect of travelling, steering and stabilizing wheel pressure respectively and typical combined wheel pressure on the system vibration was studied. The results show that the change of wheel pressure has great effect on the response of the system. The vertical response value increases with travelling wheel pressure increasing. The lateral response value increases with steering wheel pressure increasing, while the effect of stabilizing wheel pressure on the response is irregular. The effect of steering wheel pressure is greater than that of stabilizing wheel pressure on lateral responses. The effect of all of travelling and steering wheel pressure is greater than that of unilateral wheel pressure on the response. The effect tendency of stabilizing wheel pressure on the response is opposite to that of unilateral wheel pressure.

Dynamic responses of a high-speed train passing a deformed bridge using a vehicle-track-bridge coupled model

2020 ◽  
pp. 095440972094433 ◽  
Author(s):  
Hongye Gou ◽  
Chang Liu ◽  
Wen Zhou ◽  
Yi Bao ◽  
Qianhui Pu
Keyword(s):  
High Speed ◽  
Low Frequency ◽  
Coupled Model ◽  
Element Model ◽  
Vertical Vibration ◽  
Dynamic Responses ◽  
High Speed Train ◽  
Railway Network ◽  
Track Bridge ◽  
Bridge System

With the development of the railway network in a harsh environment, the additional bridge deformations accumulated over time may endanger high-speed trains passing through a bridge, since the bridge deformation directly affect the geometry of the track on the bridge, thus affecting the dynamic responses of the train. This paper investigates the effects of different types of bridge deformation on the dynamic responses of the high-speed train passing through a deformed bridge. First, a finite element model is established for a high-speed railway bridge to study the dynamic responses of vehicle-track-bridge system under bridge deformations. Then, the rail deformation caused by bridge deformation is calculated using a bridge-track deformation mapping model, and used as the excitation to the vehicle-track-bridge system to study the influence of bridge deformations on the dynamic responses of the train. Results show that the vertical bridge deformations mainly affect the vertical vehicle dynamic indices, and have negligible effect on the lateral dynamic indices. The additional bridge deformation generates an additional low-frequency excitation to the train. The bridge deformations mainly affect the dynamic responses at specific characteristic frequencies, which are independent on the magnitude of the deformation. The frequencies for bridge deformations are magnified at about 1 Hz, indicating that the additional bridge deformation may aggravate the vertical vibration of the train.

Influences of Wind Barriers on the Train Running Safety on a Highway-Railway One-Story Bridge

2021 ◽  
pp. 2140009
Author(s):  
Ye Liu ◽  
Yan Han ◽  
Peng Hu ◽  
C. S. Cai ◽  
Xuhui He
Keyword(s):  
Dynamic Responses ◽  
Response Analysis ◽  
Train Track ◽  
Wheel Load ◽  
Wind Barrier ◽  
The Mean ◽  
Wind Pressures ◽  
Track Bridge ◽  
Fluctuating Wind ◽  
Bridge System

In this study, the influences of wind barriers on the aerodynamic characteristics of trains (e.g. a CRH2 train) on a highway-railway one-story bridge were investigated by using wind pressure measurement tests, and a reduction factor of overturning moment coefficients was analyzed for trains under wind barriers. Subsequently, based on a joint simulation employing SIMPACK and ANSYS, a wind–train–track–bridge system coupled vibration model was established, and the safety and comfort indexes of trains on the bridge were studied under different wind barrier parameters. The results show that the mean wind pressures and fluctuating wind pressures on the trains’ surface decrease generally if wind barriers are used. As a result, the dynamic responses of the trains also decrease in the whole process of crossing the bridge. Of particular note, the rate of the wheel load reductions and lateral wheel-axle forces can change from unsafe states to relative safe states due to the wind barriers. The influence of the porosity of the wind barriers on the mean wind pressures and fluctuating wind pressures on the windward sides and near the top corner surfaces of the trains are significantly greater than the influence from the height of the wind barriers. Within a certain range, decreasing the wind barrier porosities and increasing the wind barrier heights will significantly reduce the safety and comfort index values of trains on the bridge. It is found that when the porosity of the wind barrier is 40%, the optimal height of the wind barrier is determined as approximately 3.5[Formula: see text]m. At this height, the trains on the bridges are safer and run more smoothly and comfortably. Besides, through the dynamic response analysis of the wind–train–track–bridge system, it is found that the installation of wind barriers in cases with high wind speeds (30[Formula: see text]m/s) may have an adverse effect on the vertical vibration of the train–track–bridge system.

Stochastic Transverse Earthquake-Induced Damage Track Irregularity Spectrum Considering the Uncertainty of Track-Bridge System

2021 ◽  
pp. 2140004
Author(s):  
Yulin Feng ◽  
Yu Hou ◽  
Lizhong Jiang ◽  
Wangbao Zhou ◽  
Jian Yu ◽  
...  
Keyword(s):  
Simulation Model ◽  
Traffic Safety ◽  
High Speed ◽  
Residual Deformation ◽  
High Speed Railway ◽  
Marquardt Algorithm ◽  
Earthquake Action ◽  
Track Irregularity ◽  
Track Bridge ◽  
Bridge System

The track irregularity spectrum of longitudinally connected ballastless track (LCBT)-bridge systems of high-speed railway was proposed in this paper. First, a simulation model of an LCBT-continuous girder bridge was established by considering the influences of approach bridges and subgrade with track structure. Further, a large number of sample analyses were carried out by taking into account the uncertainty of LCBT-bridge systems and stochastic behaviors of ground motions based on the simulation model. The damage laws of residual deformation of track-bridge system after earthquake actions were studied. Then, an interlayer deformation coordination relationship (IDCR) considering the track irregularity caused by earthquake-induced damage of bearings was developed, and the superposed track irregularity samples were obtained. Finally, by using the improved Blackman–Turkey method and Levenberg–Marquardt algorithm, the LCBT irregularity spectrum, track irregularity spectrogram, track irregularity limit spectrum, and a fitting formula for the track irregularity spectrum on a bridge after the action of earthquakes were obtained. Results obtained from the fitting formula and IDCR were compared, and they indicated that tracks undergone significant high-frequency irregularity diseases after the earthquake action. It was found that the track irregularity spectrum could be roughly divided into three ranges: high-, medium- and low-frequency wavebands. Consequently, this led to an application of a three-segment power function for the fitting of the track irregularity spectrum after the earthquake action. The track irregularity spectrum after the action of earthquakes provides an important theoretical basis for the establishment of seismic design methods for high-speed railway bridges based on the traffic safety performance.

Diversity and controllability of particle distribution under coupling vibration and airflow

Soft Matter ◽  
2017 ◽  
Vol 13 (39) ◽  
pp. 7034-7045 ◽  
Author(s):  
Li Li ◽  
Ping Wu ◽  
Shiping Zhang ◽  
Li Wang
Keyword(s):  
Particle Distribution ◽  
Vertical Vibration ◽  
Coupling Vibration

Various patterns of vertical, horizontal, and 3D distributions of binary particles are studied under coupling vertical vibration and airflow.

The Effect of Centrifugal Force and Coriolis Force on Vehicle-Flexible Bridge Vertical Vibration

2012 ◽  
Vol 455-456 ◽  
pp. 1480-1485
Author(s):  
Xiang Xiao ◽  
Wei Xin Ren ◽  
Wen Yu He
Keyword(s):  
Centrifugal Force ◽  
Coriolis Force ◽  
Mass Matrix ◽  
Interaction Model ◽  
Vertical Motion ◽  
Vertical Vibration ◽  
Time Deformation ◽  
Damping Matrix ◽  
Load Vector ◽  
Bridge System

Considering centrifugal force and Coriolis force caused by the real-time deformation of bridge, a vehicle-bridge interaction model is established. Take simply supported bridge subjected to an one-axle vehicle for example, the mass matrix, damping matrix, stiffness matrix and load vector of the vehicle-bridge system are derived via modal analysis method, thus the vertical motion equation of vehicle-bridge system, which can better reflect the operation characteristics of vehicles running on the bridge, has been established.

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