Numerical study of contact wire tension affecting dropper stress of a catenary system

He, Fan; Guo, Dan; Chen, Liming

doi:10.1177/1687814021995041

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…An analytical formula for propagation of waves in a tensile wire has been proposed, which has been used to obtain vertical acceleration of the wire when the external force acts as a concentrated input. In [14], the dropper span of the catenary system is modeled to investigate the effect of contact wire tension on dropper stress. The response equation of the contact wire and the theoretical equation of the dropper stress are inferred.…”

Section: Related Workmentioning

confidence: 99%

A Study on the Estimations of the Tension of the Overhead Wires Using Data from Acceleration Sensors

2022

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One of the important tasks of the distribution system is to operate the distribution system in consideration of the safety. It is also important to minimize and prevent possible failures in the distribution system. In terms of overhead wires, it is necessary to measure the tension of it for the purpose of ensuring safety. However, it is difficult to install sensors for measuring the tension of the overhead wires in the field as there would be huge difficulties to re-install facilities such as existing wires after dismantling them. Thus, it is difficult to manage the risk of overhead wires through tension measurement. To solve and alleviate this problem, this paper proposed and verified a method of attaching an acceleration sensor that does not require dismantling or re-installation of existing facilities to the overhead wires and estimating the tension using the data measured from the sensors. As a result of the verification, it was confirmed that the estimated tension showed a significant level of accuracy with an average of 90.39%, and on the basis of this result, it is expected to contribute to safety management of overhead wires in the future.

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Section: Related Workmentioning

confidence: 99%

A Study on the Estimations of the Tension of the Overhead Wires Using Data from Acceleration Sensors

2022

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“…He et al 6 used the MATLAB to analyze the influence of catenary tension on the stress of the integral dropper. Liu et al 7 investigated the lumped-mass distribution in single-pantograph and multi-pantograph operations with help of a 3D pantograph-catenary finite element model.…”

Section: Introductionmentioning

confidence: 99%

Study on numerical simulation method and dynamic force of dropper of a catenary system

Pan

Chen

Zhang

et al. 2023

Advances in Mechanical Engineering

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The dropper through bends and bears dynamic impact load before and after the train passes in actual service, which has an important impact on the fatigue life of the dropper. In this paper, a simulation model which can simulate the interaction between pantograph and catenary is established by using the numerical simulation method. A dropper model which can simulate the dynamic stress of the dropper is established through the beam-link combination element. The simulation result shows that among the six droppers in a span, the dynamic force of No. 1 and No. 6 droppers is the smallest, and the dynamic force of No. 3 and No. 4 droppers is the largest. The dynamic load variation characteristics of the dropper are characterized by the dynamic coefficient. When the front and rear pantograph pass through, the maximum dynamic force of the dropper appears when the rear pantograph passes through. The maximum dynamic force is located in the middle of the dropper. Through the research of this paper, the simulation method of catenary and dropper is established, and the dynamic stress process of dropper is analyzed, which lays a technical foundation for the subsequent research on the fatigue failure mechanism of dropper.

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“…In addition, with the increase of contact wire tension, the stress amplitude and maximum stress of dropper decrease significantly. 16 Zhang et al 17 found that the lateral swing of the dropper in the process of vibration deformation has an important impact on the dropper stress through field measurement and simulation analysis.…”

Section: Introductionmentioning

confidence: 99%

Study on contactless measurement method of dropper load

Liu

Liang

et al. 2022

Advances in Mechanical Engineering

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The fatigue fracture of dropper will threaten the safe operation of high-speed railway. The accurate measurement of dropper load plays an important role in dropper fatigue test and service life prediction. In this work, according to the structural characteristics of catenary suspension and based on string vibration theory, a contactless method for measuring dropper load is proposed. In this method, the edge recognition technology is used to obtain the vibration displacement time history data of the dropper clamp position on the messenger wire, the random vibration is transformed into the linear superposition of sinusoidal vibration through Fourier transform to solve the vibration differential equation. Through the relationship between the shape change of messenger wire and concentrated force, the change of dropper load is analyzed. The measurement accuracy is tested on the test platform built in the laboratory, and the results show the measurement accuracy can reach 0.50%.

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Numerical study of contact wire tension affecting dropper stress of a catenary system

Cited by 7 publications

References 16 publications

A Study on the Estimations of the Tension of the Overhead Wires Using Data from Acceleration Sensors

A Study on the Estimations of the Tension of the Overhead Wires Using Data from Acceleration Sensors

Study on numerical simulation method and dynamic force of dropper of a catenary system

Study on contactless measurement method of dropper load

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