Influence of catenary tension on static elasticity and dynamic contact force between pantograph and catenary

Zhang, Jian; Liu, Wenzheng; Qiao, Kai; Meili, Yu; Wang, Tianyu; Yang, Zhongping

doi:10.1049/iet-est.2016.0076

Cited by 6 publications

(4 citation statements)

References 11 publications

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“…Based on the pantograph–catenary model shown in Figure 1, the catenary stiffness distribution curve was calculated according to the definition of elasticity in EN50119 [26]. The curvature of the curve is used to calculate the curvature of stiffness, which represents the rate of change of stiffness [27], as shown in Figure 3a. The pantograph–catenary contact force when the running speed is 350 km/h is shown in Figure 4.…”

Section: Establishment Of Pantograph–catenary Coupling Modelmentioning

confidence: 99%

“…In a previous study [27], it was found that the characteristics of the catenary stiffness were directly affected by the wire tension of the catenary. However, the periodic characteristics of stiffness and its variation laws are directly related to the catenary structural parameters, such as the dropper spacing and the length of the stitch wires.…”

Section: Relationship Between Catenary Stiffness and Contact Forcementioning

confidence: 99%

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Research on time–frequency characteristics of contact force based on wavelet transform

Zhang

2022

IET Electrical Syst in Trans

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When a train runs at high speed, affected by the structural characteristics of the catenary, the contact force changes periodically with span and dropper spacing. However, as the running speed of the train increases, the periodic signal of the contact force changes owing to the fluctuation of the catenary and the vibration of the pantograph, which directly affects the stable contact between the pantograph and catenary. Therefore, based on the simulation research method, this study uses the time-frequency transformation method to investigate the influence of changes in the catenary structure on the periodic signal of the contact force. First, the structural design of the catenary structure of the existing railway line is carried out by changing the length of the stitch wires and the dropper spacing, and the stiffness and stiffness curvature variation when the arrangement of the stitch wires and dropper varies are analysed. Then, the relationship between the stiffness, stiffness curvature variation, and contact force variation is analysed. Finally, the wavelet transform method is used to transform the contact force, and variations in the key amplitude component of the contact force are analysed when the structural parameters are changed, and the relationship between the period and the key amplitude component is obtained. By analysing the time-frequency characteristics of the contact force, technical support for improving the speed of the train can be provided.

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Section: Establishment Of Pantograph–catenary Coupling Modelmentioning

confidence: 99%

Section: Relationship Between Catenary Stiffness and Contact Forcementioning

confidence: 99%

Research on time–frequency characteristics of contact force based on wavelet transform

Zhang

2022

IET Electrical Syst in Trans

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“…The best approach to improve the wave propagation speed is to increase the tension in the OCL. But this is normally restricted by the material limitation [17], [18]. In order to improve the wave propagation property, some parameter optimization methods for OCLs [19], [20] are developed.…”

Section: B Literature Reviewmentioning

confidence: 99%

A Response Spectrum Analysis of Wind Deflection in Railway Overhead Contact Lines Using Pseudo-Excitation Method

Song

Zhang

Wang

2021

IEEE Trans. Veh. Technol.

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The wind deflection of overhead contact lines (OCLs) challenges the stable and safe operation of electrified railways. The steady wind causes the static deflection of the contact line, while the fluctuating wind leads to the OCL buffeting. This paper performs a response spectrum analysis of the wind deflection caused by the combined effects of steady and fluctuating winds. Considering the initial configuration of OCL, an absolute nodal coordinate formulation method is employed to model the OCL. A spatial wind field including the fluctuating wind in three directions is constructed and the aerodynamic forces on the OCL are derived. A nonlinear solution procedure is proposed to include the geometrical nonlinearity and dropper slackness in the evaluation of static wind deflection. The pseudo-excitation method is utilised to evaluate the buffeting response of the OCL with stochastic wind load. The analysis results indicate that the dropper slackness has a significant effect on the vertical static deflection. Under an extreme wind speed of 40 m/s, the contact line is always within the safe working range of pantograph head when only the steady wind load is considered. However, the stochastic wind load causes non-negligible fluctuation of OCL, and the contact line may be outside of the pantograph working range under the same wind speed. Sensitivity analyses on the effects of some key parameters to the OCL buffeting suggest that the increases of damping ratio and the tension class are effective measures to improve the wind-resistance capability of OCL.

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“…The pantograph and catenary system form a coupled vibration system through contact points, the dynamic simulation can effectively reflect the current collection quality between pantograph and catenary of high-speed railway. 2,3 Through the dynamic simulation between pantograph and catenary system, the effects of aerodynamic effect, 4,5 environmental conditions, 6 track excitation, 7 pre-sag, 8 and catenary tension 9 on the dynamic current collection performance can be studied.…”

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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Influence of catenary tension on static elasticity and dynamic contact force between pantograph and catenary

Cited by 6 publications

References 11 publications

Research on time–frequency characteristics of contact force based on wavelet transform

Research on time–frequency characteristics of contact force based on wavelet transform

A Response Spectrum Analysis of Wind Deflection in Railway Overhead Contact Lines Using Pseudo-Excitation Method

Study on contactless measurement method of dropper load

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