scholarly journals Method for Running Safety Assessment of Railway Vehicles against Structural Vibration Displacement during Earthquakes

2007 ◽  
Vol 48 (3) ◽  
pp. 129-135 ◽  
Author(s):  
Xiu LUO ◽  
Takefumi MIYAMOTO
Keyword(s):  
Safety Assessment ◽  
Structural Vibration ◽  
Vibration Displacement ◽  
Railway Vehicles ◽  
Running Safety

scholarly journals Wind-Induced Vibration Control of High-Rise Structures Using Compound Damping Cables

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Jianda Yu ◽  
Zhibo Duan ◽  
Xiangqi Zhang ◽  
Jian Peng
Keyword(s):  
Vibration Control ◽  
Damping Ratio ◽  
Viscosity Coefficient ◽  
Structural Vibration ◽  
Vibration Displacement ◽  
High Rise ◽  
Main Cable ◽  
Small Vortex ◽  
Wind Induced Vibration ◽  
Fluctuating Wind

Based on the vibration reduction mechanism of compound damping cables, this study focuses on the wind-induced vibration control of high-rise structures with additional mass at the top. The differential equation of motion of the system under the action of the composite damping cable is established, and the analytical solution of the additional damping ratio of the structure is deduced, which is verified by model tests. The vibration response of the structure under the action of simple harmonic vortex excitation and randomly fluctuating wind loads is studied, and the effect of different viscous coefficients of the dampers in the composite damping cable and different installation heights of the damping cable on the vibration control is analyzed. The results show that a small vortex excitation force will cause large vibrations of low-dampened towering structures, and the structure will undergo buffeting under the action of wind load pulse force. The damping cable can greatly reduce the amplitude of structural vibration. The root means square of structural vibration displacement varies with damping. The viscosity coefficient of the device and the installation height of the main cable of the damping cable are greatly reduced.

The relationship between structural vibration and noise of railway vehicles

2012 ◽  
Vol 131 (4) ◽  
pp. 3264-3264 ◽  
Author(s):  
Gong Lv ◽  
Junhai Liang ◽  
Jinzhu Liu ◽  
Jianmin Ge
Keyword(s):  
Structural Vibration ◽  
Railway Vehicles ◽  
The Relationship

scholarly journals Seismic Train-Running Safety on Structures

Proceedings ◽  
2018 ◽  
Vol 2 (16) ◽  
pp. 1143
Author(s):  
Keiichi Goto ◽  
Masamichi Sogabe ◽  
Munemasa Tokunaga
Keyword(s):  
Dynamic Interaction ◽  
Analysis Program ◽  
Railway Vehicles ◽  
Running Safety

In this study, using the analysis program DIASTARS III that is able to take into account the dynamic interaction between railway vehicles and railway structures, we conducted seismic train-running analysis on a model line that is about 4.8 km long. And we identified the relative weak structures of seismic train-running safety in the model line.

Stochastic Analysis of Vehicle-Bridge Coupled Interaction and Uncertainty Bounds of Random Responses in Heavy Haul Railways

2019 ◽  
Vol 19 (12) ◽  
pp. 1950144
Author(s):  
Jianfeng Mao ◽  
Zhiwu Yu ◽  
Lizhong Jiang
Keyword(s):  
Probability Distribution ◽  
Safety Assessment ◽  
Structural Parameters ◽  
Time History ◽  
Coupled System ◽  
Dynamic Responses ◽  
Running Safety ◽  
Heavy Haul ◽  
Vehicle Loads ◽  
Random Responses

The systematic running safety assessment of railway bridges presents lots of challenges, one of which is estimating the uncertainty bounds of the structural responses of bridges under vehicle loads with multisource randomness. In this study, a probability safety assessment method is proposed for evaluating the uncertainty bounds of random time-history responses for the stochastic train-bridge coupled system. First, a refined probabilistic model for the train-bridge coupled system (TBS) in heavy haul railway is established with the multi-excitations of random track irregularities, random vehicle loads and stochastic structural parameters. The probability density evolution method (PDEM) is employed to obtain the solution of the time-varying probability transferred between the stochastic excitations and the output of the dynamic responses. Then, to establish a rapid and straightforward approach for the systematic running safety assessment of the TBS, the quantiles of the probability distribution are used to estimate the time-history uncertainty bounds of random responses of interest distributed in real probability functions. Case studies by the field test and numerical simulation are presented to verify and investigate the accuracy and reliability of the proposed method. The results show that the quantiles of the probability distribution proposed are suitable for the systematic running safety assessment of the TBS.

scholarly journals Investigation of the some problems of running safety of rolling stock on the Ukrainian railways

2016 ◽  
Vol 40 (4) ◽  
pp. 15-27 ◽  
Author(s):  
Rostyslav Domin ◽  
Iurii Domin ◽  
Ganna Cherniak ◽  
Anatolii Mostovych ◽  
Valeria Konstantidi ◽  
...  
Keyword(s):  
High Speed ◽  
Simulation Analysis ◽  
Technical Condition ◽  
Rolling Stock ◽  
Railway Vehicles ◽  
Running Safety ◽  
Time Period ◽  
Software And Hardware ◽  
The Impact ◽  
Non Destructive

The results of the evaluation of the running safety conditions of railway vehicles are presented by means of computer simulation. Analysis of the possible reasons for derailment by means of performance evaluation of rolling stock and track interaction are presented. The impact of the technical condition of the dampers on the running safety of passenger wagons is considered. The localization of possible damages of bearing structures of high-speed train is determined with the help of calculation of the strength characteristics and the method of non-destructive metallography. There is the information about the development of software and hardware complexes providing an instrumental assessment of the technical condition of railway vehicles. Portable device is proposed for measuring the static load of the wheels of the rolling stock units on the track. The work on creation of stationary devices for automatic wheels fault detection in order to reduce the time period from the appearance of the defect was conducted. The brainchild of the mobile system of controlling running tests and dynamic diagnostics of rolling stock was considered.

scholarly journals Damage tolerance of fractured rails on continuous welded rail track for high-speed railways

2020 ◽  
Author(s):  
Yuan Gao ◽  
Ping Wang ◽  
Kai Wang ◽  
Jingmang Xu ◽  
Zhiguo Dong
Keyword(s):  
High Speed ◽  
Damage Tolerance ◽  
Coupling Effect ◽  
Nonlinear Material ◽  
Structural Vibration ◽  
Sequential Approach ◽  
Secondary Fracture ◽  
Running Safety ◽  
Fracture Length ◽  
The Impact

AbstractBroken gap is an extremely dangerous state in the service of high-speed rails, and the violent wheel–rail impact forces will be intensified when a vehicle passes the gap at high speeds, which may cause a secondary fracture to rail and threaten the running safety of the vehicle. To recognize the damage tolerance of rail fracture length, the implicit–explicit sequential approach is adopted to simulate the wheel–rail high-frequency impact, which considers the factors such as the coupling effect between frictional contact and structural vibration, nonlinear material and real geometric profile. The results demonstrate that the plastic deformation and stress are distributed in crescent shape during the impact at the back rail end, increasing with the rail fracture length. The axle box acceleration in the frequency domain displays two characteristic modes with frequencies around 1,637 and 404 Hz. The limit of the rail fracture length is 60 mm for high-speed railway at a speed of 250 km/h.

Application of Computer Simulation Methods for Running Safety Assessment of Railway Vehicles in Example of Freight Cars

2007 ◽  
Vol 9 ◽  
pp. 61-69 ◽  
Author(s):  
Andrzej Chudzikiewicz ◽  
Michał Opala
Keyword(s):  
Computer Simulation ◽  
Computer Simulations ◽  
Safety Assessment ◽  
Load Level ◽  
Simulation Methods ◽  
Railway Vehicles ◽  
Safety Issues ◽  
Rail Vehicle ◽  
Codes Of Practice ◽  
Track Irregularities

We shall discuss the problem of rail vehicle safety studies using simulation methods. The contemporary methods and criteria used for safety assessment of railway vehicles by railways Europe are shown, whereas special attention is paid to the criteria and research programs applied to the vehicle approval procedures in Poland. Taking advantage of these safety criteria and codes of practice, a number of computer simulations have been conducted in order to study the safety issues. Presented results of the computer simulations include a rail vehicle running on a tangent and curved track for different simulation parameters such as: running velocity, load level, condition of wheel profiles, track irregularities. The track irregularities represent different maintenance quality levels which are set according to UIC518 code. In this paper there has also been made a comparison between the results of computer simulation safety assessment studies and the measurements taken in real conditions during the safety tests of a Shimmns(s) type freight vehicle.

Self-Sensing Active Suppression of Vibration of Flexible Steel Sheet

1996 ◽  
Vol 118 (3) ◽  
pp. 469-473 ◽  
Author(s):  
Ken-ichi Matsuda ◽  
Masahiro Yoshihashi ◽  
Yohji Okada ◽  
Andy C. C. Tan
Keyword(s):  
Vibration Control ◽  
Transverse Vibration ◽  
Steel Sheet ◽  
Active Vibration Control ◽  
Structural Vibration ◽  
Sensors And Actuators ◽  
Vibration Displacement ◽  
Active Vibration ◽  
High Possibility

In rolling processes, flexible steel sheet is supported by rollers and is bound to produce structural vibration. This vibration can cause severe problems to surface finish and affect the quality of the product. To overcome these problems, active vibration control has been proposed. This usually requires both sensors and actuators. The location of sensors and actuators plays a very important role in active vibration control. Moreover, a reliable sensor can be very expensive. This paper proposes a self-sensing vibration control using a push-pull type electromagnet to control the transverse vibration of the steel plate. The construction of the electromagnet has two types of coils, namely the bias coil and the control coil. Vibration displacement is estimated by using the mutual inductance change between the bias and the control coils. The estimated signal is proportional to the gap displacement. The proportional and derivative signals are fed back to the control coil to reduce the transverse vibration of the steel sheet. The proposed method is applied to a simple test rig to confirm the capability of the device. The results obtained are showing high possibility for reducing steel sheet vibration.

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