Theoretical study on a dual-beam model for detection of track/bridge frequencies and track modulus by a moving vehicle

2021 ◽  
Vol 244 ◽  
pp. 112726
Author(s):  
Y.B. Yang ◽  
K. Shi ◽  
Zhi-Lu Wang ◽  
Hao Xu ◽  
Y.T. Wu
Keyword(s):  
Theoretical Study ◽  
Beam Model ◽  
Moving Vehicle ◽  
Dual Beam ◽  
Track Bridge ◽  
Track Modulus

Experimental and Theoretical Study of a Dual-Beam Piezoelectric Energy Harvester With Misaligned Magnets

2018 ◽  
Author(s):  
Wei-Jiun Su ◽  
Hsuan-Chen Lu
Keyword(s):  
Energy Harvester ◽  
Theoretical Study ◽  
Beam Theory ◽  
Main Beam ◽  
Bernoulli Beam ◽  
Potential Wells ◽  
Piezoelectric Energy ◽  
Dual Beam ◽  
Frequency Sweeps ◽  
Euler Bernoulli Beam

In this study, a dual-beam piezoelectric energy harvester is proposed. This harvester consists of a main beam and an auxiliary beam with a pair of magnets attached to couple their motions. The potential energy of the system is modeled to understand the influence of the potential wells on the dynamics of the harvester. It is noted that the alignment of the magnets significantly influences the potential wells. A theoretical model of the harvester is developed based on the Euler-Bernoulli beam theory. Frequency sweeps are conducted experimentally and numerically to study the dynamics of the harvester. It is shown that the dual-beam harvester can exhibit hardening effect with different configurations of magnet alignments in frequency sweeps. The performance of the harvester can be improved with proper placement of the magnets.

scholarly journals A dual beam model for geosynthetic-reinforced granular fill on an elastic foundation

2016 ◽  
Vol 40 (21-22) ◽  
pp. 9254-9268 ◽  
Author(s):  
Lin-Shuang Zhao ◽  
Wan-Huan Zhou ◽  
Behzad Fatahi ◽  
Xi-Bin Li ◽  
Ka-Veng Yuen
Keyword(s):  
Elastic Foundation ◽  
Beam Model ◽  
Dual Beam ◽  
Granular Fill

Surface roughness effects in dual beam illumination speckle interferometers: Theoretical study

Optik ◽  
2001 ◽  
Vol 112 (4) ◽  
pp. 163-168 ◽  
Author(s):  
C. Joenathan ◽  
R. Torroba ◽  
R. Henao
Keyword(s):  
Surface Roughness ◽  
Theoretical Study ◽  
Roughness Effects ◽  
Dual Beam

The Analysis of Vibration for Ballastless Track-Bridge Base on a Hybrid FE-SEA Method

2013 ◽  
Vol 405-408 ◽  
pp. 3213-3217
Author(s):  
Wen Jun Luo ◽  
Xiao Yan Lei ◽  
Song Liang Lian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vibration Analysis ◽  
High Performance ◽  
Beam Model ◽  
The Finite Element Method ◽  
Frequency Method ◽  
Ballastless Track ◽  
Track Bridge ◽  
Element Method

In this study, the methods for combining statistical energy analysis (SEA) and the finite element method (FEM) for the vibration analysis of structures are studied. Using the two methods simultaneously isnt entirely extend a primarily low frequency method, the finite element method, and high frequency method, SEA, to the mid frequency region are addressed. This approach is intended to extend the frequency range for a FEM based vibration analysis . A new finite element elementl for elevated slab ballastless track is proposed in which the new model can be used for modeling the track structural constituents of elevated slab ballastless track. Using finite element method and Hamilton theory, the coupled equation of vehicle-track-bridge can be established. In calculating example, both the rail displacement induced by single four-layer beam model. Specifically, it showed that the method yields very good result and high performance in the numerical example of previous research.

State-of-the-Art of Vehicle-Based Methods for Detecting Various Properties of Highway Bridges and Railway Tracks

2020 ◽  
Vol 20 (13) ◽  
pp. 2041004 ◽  
Author(s):  
Y. B. Yang ◽  
Zhi-Lu Wang ◽  
Kang Shi ◽  
Hao Xu ◽  
Y. T. Wu
Keyword(s):  
State Of The Art ◽  
Highway Bridges ◽  
Mode Shapes ◽  
Future Research ◽  
Scanning Method ◽  
Moving Vehicle ◽  
Geometrical Properties ◽  
Railway Tracks ◽  
Data Loggers ◽  
Track Bridge

The vehicle scanning method (VSM), an indirect approach for bridge measurement, has attracted intensive attention since it was proposed. By this method, a moving test vehicle is employed to detect the “mechanical” properties of the bridge, e.g. frequencies, mode shapes, damages, etc., utilizing the interaction between the two substructures. Compared with the conventional direct approach that requires quite a few sensors and data loggers to be fitted on the bridge, the advantage of the VSM is obvious: mobility, economy, and efficiency. As for railways, the broader vehicle-based techniques have long been used to detect the “geometrical” properties of the track, such as track profiles and rail conditions. Relatively little use has been made of the interaction between the moving vehicle/train and the track/bridge. This paper is a state-of-the-art report of the VSM’s applications to highway bridges and the vehicle-based techniques to railway tracks. It starts with a summary of the pioneering works by Yang and co-workers on the VSM. Then, the applications of the techniques to highway bridges and railway tracks will be separately reviewed. Conclusions will be made, along with future research directions, at the end of the paper.

scholarly journals A Damage Detection Algorithm Utilizing Dynamic Displacement of Bridge under Moving Vehicle

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Zhen Sun ◽  
Tomonori Nagayama ◽  
Di Su ◽  
Yozo Fujino
Keyword(s):  
Damage Detection ◽  
Engineering Practice ◽  
Beam Model ◽  
Dynamic Component ◽  
Dynamic Displacement ◽  
Moving Vehicle ◽  
Finite Element Software ◽  
Damage Location ◽  
Bridge Structures ◽  
Damage Extent

A damage detection method is proposed, which utilizes dynamic displacement of bridge structures under moving vehicle. The problem is first elaborated with closed-form solution of dynamic displacement, which is decomposed into quasi-static component and dynamic component. Dynamic curvature is defined as second derivative of the dynamic displacement for detecting damage location and estimating damage extent. Damage is modeled by local reduction of stiffness in this paper. Numerical study was conducted on a simply supported beam to verify the proposed method. Vehicle model is analyzed with Newmark’s method using Matlab to obtain the contact force acting on the bridge. Beam model is established in commercial finite element software ABAQUS. The effects of road surface roughness and vehicle-bridge interaction are both considered in the analysis. In order to identify damage location and extent, dynamic curvature was calculated with midspan displacement. Parametric study on measurement noise level, damage location, damage extent, and multiple damage cases is performed, and the analysis results show both reliability and efficacy of this method in damage detection of bridge structures. At last, conclusions are drawn for its application to bridges in engineering practice.

On low-velocity impact response of metal foam core sandwich beam: A dual beam model

2017 ◽  
Vol 176 ◽  
pp. 1039-1049 ◽  
Author(s):  
Qinghua Qin ◽  
Chunping Xiang ◽  
Jianxun Zhang ◽  
Mingshi Wang ◽  
T.J. Wang ◽  
...  
Keyword(s):  
Metal Foam ◽  
Sandwich Beam ◽  
Impact Response ◽  
Low Velocity Impact ◽  
Beam Model ◽  
Foam Core ◽  
Low Velocity ◽  
Velocity Impact ◽  
Dual Beam
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