scholarly journals Random Vibration Analysis of Coupled Three-Dimensional Maglev Vehicle-Bridge System

2019 ◽  
Vol 2019 ◽  
pp. 1-14 ◽  
Author(s):  
Wei Liu ◽  
Wenhua Guo
Keyword(s):  
State Space ◽  
Governing Equation ◽  
Vibration Analysis ◽  
Random Vibration ◽  
Three Dimensional ◽  
Equation Of Motion ◽  
Maglev Vehicle ◽  
Random Vibration Analysis ◽  
Space Equation ◽  
Bridge System

This paper presents a framework for the linear random vibration analysis of the coupled three-dimensional (3D) maglev vehicle-bridge system. Except for assembling the equation of motion of vehicle only via the principle of virtual work, the fully computerized approach is further expanded to assemble the governing equation of fluctuating current via the equilibrium relation. A state-space equation couples the equation of motion of the vehicle and the governing equation of fluctuating current. The equation of motion of a real three-span space continuous girder bridge is established by using finite element methods. A separated iteration method based on the precise integration method and the Newmark method is introduced to solve the state-space equation for the maglev vehicle and the equation of motion for the bridge. Moreover, a new scheme to application of the pseudoexcitation method (PEM) in random vibration analysis is proposed to maximize the computational efficiency of the random vibration analysis of the maglev vehicle-bridge system. Finally, the numerical simulation demonstrates that the proposed framework can efficiently obtain the mean value, root mean square (RMS), standard deviation (SD), and power spectral density (PSD) of dynamic response for the coupled 3D maglev vehicle-bridge system.

A Non-Iterative Integration Scheme Enriching the Solution to the Coupled Maglev Vehicle–Bridge System

2021 ◽  
pp. 2150052
Author(s):  
Wei Liu ◽  
Wenhua Guo
Keyword(s):  
State Space ◽  
Equation Of Motion ◽  
Numerical Dissipation ◽  
Integration Scheme ◽  
Superposition Method ◽  
Coupled Equations ◽  
Maglev Vehicle ◽  
Iterative Integration ◽  
Space Equation ◽  
Bridge System

A non-iterative integration scheme is presented in this study to enrich the solutions to the coupled equations of the maglev vehicle–bridge system. The proposed integration scheme is composed of two integration methods aiming at providing the solutions to equation of motion and state-space equation. First, the equation of motion of the simply supported girder bridge is transformed by the modal superposition method. Then the state-space equation is used to describe the motions of both the vehicle and the suspension control system, with the associated matrices assembled using the fully computerized approach. By adopting this integration scheme, only pure vector calculations arise in the solution process, regardless of the existence of time-dependent displacement and velocity on the right-hand sides of the two coupled equations. The proposed integration method is of the second-order accuracy with and without damping. Being equipped with adequate numerical dissipation and dispersion, the method also possesses the characteristic of little computing errors, as can be achieved through the use of different pairs of parameters. Finally, numerical simulations have been conducted to assess the influence of different feedback gains, three types of bridges with different lengths, and guideway irregularity on the maglev vehicle–bridge system.

Non-stationary random vibration analysis of three-dimensional train–bridge systems

2010 ◽  
Vol 48 (4) ◽  
pp. 457-480 ◽  
Author(s):  
Z. C. Zhang ◽  
J. H. Lin ◽  
Y. H. Zhang ◽  
W. P. Howson ◽  
F. W. Williams
Keyword(s):  
Vibration Analysis ◽  
Random Vibration ◽  
Three Dimensional ◽  
Random Vibration Analysis

Random Vibration Analysis of the Underframe Structure on a High-Speed Train

ICTE 2015 ◽  
2015 ◽  
Author(s):  
Hanfei Guo ◽  
Xiaoxue Liu ◽  
Wei Tong ◽  
Youwei Zhang ◽  
Yanlei Zhang
Keyword(s):  
Vibration Analysis ◽  
High Speed ◽  
Random Vibration ◽  
High Speed Train ◽  
Random Vibration Analysis

Non-stationary random vibration analysis of structures under multiple correlated normal random excitations

2017 ◽  
Vol 400 ◽  
pp. 481-507 ◽  
Author(s):  
Yanbin Li ◽  
Sameer B. Mulani ◽  
Rakesh K. Kapania ◽  
Qingguo Fei ◽  
Shaoqing Wu
Keyword(s):  
Vibration Analysis ◽  
Random Vibration ◽  
Random Vibration Analysis

Modeling and Analysis of Flow-Induced Vibrations in Circular Saws

1985 ◽  
Vol 107 (2) ◽  
pp. 196-202
Author(s):  
M. C. Leu ◽  
M. Jirapongphan
Keyword(s):  
Vibration Analysis ◽  
Random Vibration ◽  
Pressure Fluctuations ◽  
Time Function ◽  
Resonant Vibration ◽  
Modeling And Analysis ◽  
Flow Induced Vibrations ◽  
Flow Pressure ◽  
Circular Saws ◽  
Random Vibration Analysis

Two types of flow-induced vibrations in idling circular saws, random vibration and resonant vibration, were modeled and analyzed. The excitation source, which is the flow pressure fluctuations, was modeled as discrete forces acting at the saw teeth. The response was assumed to be uncoupled from the excitation in the random vibration analysis but coupled with the excitation in the resonant vibration analysis. The random vibration was solved in terms of statistical rms amplitudes and the resonant vibration as a time function. The analytical results captured many characteristics of vibration phenomena observed in idling saw experiments.

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