Failure analysis and optimization of integral droppers used in high speed railway catenary system

Liu, Xi-Yang; Peng, Jinfang; Tan, Deqiang; Xu, Zhibiao; Liu, Jianhua; Mo, Jiliang; Zhu, Minhao

doi:10.1016/j.engfailanal.2018.02.003

Cited by 23 publications

(12 citation statements)

References 10 publications

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“…where EI is the bending rigidity of the contact wire,r is the density, A is the cross-sectional area, y(x,t) is the displacement in the vertical direction caused by vibration, c represents the distance between the load location and the origin, F(t) is the load acting on the contact wire, N is the contact wire tension, the symbol d() stands for the Dirac delta function. The solution of equation (1) needs to be obtained by boundary conditions. The catenary model established in this paper is shown in Figure 1.…”

Section: Differential Equationmentioning

confidence: 99%

“…The solution of equation (1) needs to be obtained by boundary conditions. The catenary model established in this paper is shown in Figure 1.…”

Section: Differential Equationmentioning

confidence: 99%

“…In order to solve the equation of the contact wire, the mode method is used to set the solution of equation (1).…”

Section: Differential Equationmentioning

confidence: 99%

“…The catenary is mainly composed of contact wire, messenger wire and dropper, which is the key components of a railway electrified system. 1 Dropper is the transmitter of vibration and force between contact wire and messenger wire. It is also the most prone to fatigue fracture in a catenary system.…”

Section: Introductionmentioning

confidence: 99%

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

Guo

Chen

2021

Advances in Mechanical Engineering

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Dropper is the key component of in a catenary system and it is prone to fatigue fracture. Dropper stress directly affects the operation safety of high-speed railway. In this paper, a span of dropper in a catenary system is modeled to investigate the effects of contact wire tension on dropper stress. The response equation of contact wire and the theoretical equation of dropper stress are deduced. The initial and boundary conditions of each dropper are determined, and then the stress of each dropper is calculated by the finite difference method using a MATLAB program. The results show that the stress amplitude and the maximum tensile stress of the dropper decrease significantly with the increase of contact wire tension. When the tension is low, the stress changes of dropper near the load location experience three stages: instant rebound, attenuated vibration, and bending compression. However, the attenuation vibration stage disappears when the tension is increased to a certain extent. Therefore, the control of the vibration response of the contact wire can effectively reduce the stress amplitude and the maximum tensile stress of the dropper, so as to improve the working reliability of the dropper.

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Section: Differential Equationmentioning

confidence: 99%

“…The solution of equation (1) needs to be obtained by boundary conditions. The catenary model established in this paper is shown in Figure 1.…”

Section: Differential Equationmentioning

confidence: 99%

“…In order to solve the equation of the contact wire, the mode method is used to set the solution of equation (1).…”

Section: Differential Equationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Guo

Chen

2021

Advances in Mechanical Engineering

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“…From case studies, the fatigue modes of droppers that have been mastered are mostly due to metal fatigue [2]. The fatigue life of a dropper under real working conditions depends on the load-life characteristics of the dropper and the actual dynamic load in the dropper.…”

Section: Introductionmentioning

confidence: 99%

Simulation Method for Dropper Dynamic Load Considering Horizontal Vibration Behaviour

Zhang¹,

Wu²,

Chen³

et al. 2019

Int. j. simul. model.

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Dropper is the key component of catenary in high-speed railways. The prediction of the fatigue life of dropper is accomplished using alternating load characteristics. Simulation method for obtaining the dynamic internal load of the dropper in previous studies was insufficient for accurate requirements in predicting dropper life. According to realistic working conditions in the simulation environment, this study proposed a simulation method considering horizontal vibration behaviour for the dropper. The horizontal vibration phenomenon of a dropper was determined on the basis of observing and measuring a real high-speed railway. Moreover, a test for the reappearance of horizontal vibration in the laboratory was performed. The dropper was modelled with multibody dynamics. Finally, the horizontal vibration behaviour of the dropper on-site was reproduced in a laboratory test and computer simulation. Results demonstrated that the coefficient of association between the virtual sensor load in a simulation environment and the real sensor load in a laboratory test is 0.9578. The proposed method provides an accurate approach to simulating the load of the droppers under real working conditions.

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Improving of the Electrothermal Characteristics of the Contact Line

Galkin

Buynosov

Paranin

et al. 2020

VIII International Scientific Siberian Transport Forum

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Failure analysis and optimization of integral droppers used in high speed railway catenary system

Cited by 23 publications

References 10 publications

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

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

Simulation Method for Dropper Dynamic Load Considering Horizontal Vibration Behaviour

Improving of the Electrothermal Characteristics of the Contact Line

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