Fatigue life analysis of dropper used in pantograph-catenary system of high-speed railway

Chen, Liming; Peng, Peihuo; He, Fan

doi:10.1177/1687814018776135

Cited by 19 publications

(10 citation statements)

References 7 publications

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“…The elastic modulus of the dropper is measured by universal material testing machine 17 and electronic extensometer, and the bending stiffness is obtained by Costello model. 18 The parameters of the dropper involved in the calculation process are shown in Table 1.…”

Section: Vibration Equation Of Droppermentioning

confidence: 99%

The influence of wind load on the stress characteristics of dropper for a high-speed railway

Chen

Guo

Pan

et al. 2022

Advances in Mechanical Engineering

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In this paper, the influence of wind load on the stress characteristics of dropper for a high-speed railway is studied. The section method is used to obtain the vibration equation of the dropper, and the finite difference method is used to convert the partial differential equation of the dropper vibration into a finite difference equation. Through the force analysis of the contact line section upwind, the vibration equation of the contact line with air damping is obtained. Thus, the partial differential equation of the motion can determine the initial and boundary conditions of each dropper. The MATLAB program is written to obtain the stress change diagram of each dropper, and the influence of wind load on the stress characteristics of the dropper is analyzed. The results show that the maximum tensile and compressive stresses of each dropper are different due to the difference of wind load and dropper location, and the dropper in the middle location is most sensitive to the change of wind load. At a low wind speed, there are immediate rebound and obvious attenuation vibration stages during the stress change of dropper. In addition, with the increasing speed of wind load, the stress amplitude and the maximum tensile stress of dropper do not almost change or decrease except the middle dropper.

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Section: Vibration Equation Of Droppermentioning

confidence: 99%

The influence of wind load on the stress characteristics of dropper for a high-speed railway

Chen

Guo

Pan

et al. 2022

Advances in Mechanical Engineering

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“…eoretical Equations for Stress Calculation. In our previous work, the theoretical equations for stress calculation of dropper were deduced in detail, which could be found in reference [21]. Here, we directly give them as follows according to Figure 2.…”

Section: Y(x)mentioning

confidence: 99%

Analysis of Dropper Stress in a Catenary System for a High-Speed Railway

Chen

Sun

Pan

et al. 2022

Mathematical Problems in Engineering

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When the pantograph slides over the contact wire at a high speed, there are cyclic stresses acting on droppers. The cyclic stresses are related with the fatigue life and fracture of the dropper. Thus, the stress calculation of the dropper is particularly important to ensure the safe operation of a train. In this paper, a simple model based on a span of five droppers is constructed. The contact wire is treated as a beam element and the vibration equation under a dynamic force is deduced. Then, the stresses are performed numerically using the finite difference method. The stress-time relationship under a dynamic force is obtained and compared with that under a constant force. The results show that there is a large shock effect during the deformation of dropper from straightening to compression and then bending. The dynamic force could cause much higher stresses than a constant force. It indicates that a dynamic force has a more significant impact on the stress value of dropper than a constant force.

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“…In the analysis and prediction of dropper fatigue lives, Chen et al [5] carried out a simulated calculation based on laboratory conditions for the relationships between the frequency, amplitude, and force of the dropper in the fatigue tests. However, only the vertical vibration was studied.…”

Section: State Of the Artmentioning

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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Fatigue life analysis of dropper used in pantograph-catenary system of high-speed railway

Cited by 19 publications

References 7 publications

The influence of wind load on the stress characteristics of dropper for a high-speed railway

The influence of wind load on the stress characteristics of dropper for a high-speed railway

Analysis of Dropper Stress in a Catenary System for a High-Speed Railway

Simulation Method for Dropper Dynamic Load Considering Horizontal Vibration Behaviour

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