scholarly journals Identification of short-wavelength contact wire irregularities in electrified railway pantograph–catenary system

2021 ◽  
Vol 162 ◽  
pp. 104338
Author(s):  
Yang Song ◽  
Anders Rønnquist ◽  
Tengjiao Jiang ◽  
Petter Nåvik
Keyword(s):  
Short Wavelength ◽  
Contact Wire ◽  
Catenary System ◽  
Electrified Railway

scholarly journals A Numerical Method Based on the Parametric Variational Principle for Simulating the Dynamic Behavior of the Pantograph-Catenary System

2018 ◽  
Vol 2018 ◽  
pp. 1-21 ◽  
Author(s):  
Dongdong He ◽  
Qiang Gao ◽  
Wanxie Zhong
Keyword(s):  
Variational Principle ◽  
Dynamic Behavior ◽  
Integration Method ◽  
Time Integration ◽  
Dynamic Responses ◽  
Precise Integration ◽  
Contact Wire ◽  
Parametric Variational Principle ◽  
The Matrix ◽  
Catenary System

Based on the finite element method (FEM), the parametric variational principle (PVP) is combined with a numerical time-domain integral method to simulate the dynamic behavior of the pantograph-catenary system. Based on PVP, formulations for the nonlinear droppers in the catenary and for the contact between the pantograph and the contact wire are proposed. The formulations can accurately determine the tension state or compression state of the nonlinear droppers and the contact state between the pantograph and the contact wire. Based on the periodicity of the catenary and the precise integration method (PIM), a numerical time-integration method is developed for the dynamic responses of the catenary. For this method, the matrix exponential of only one unit cell of the catenary is computed, which greatly improves the computational efficiency. Moreover, the validation shows that the formulations can compute the contact force accurately and represent the nonlinearity of the droppers, which demonstrates the accuracy and reliability of the proposed method. Finally, the dynamic behaviors of the pantograph-catenary system with different types of catenaries are simulated.

Analysis of the galloping behaviour of an electrified railway overhead contact line using the non-linear finite element method

2018 ◽  
Vol 232 (10) ◽  
pp. 2339-2352 ◽  
Author(s):  
Yang Song ◽  
Zhigang Liu ◽  
Hongrui Wang ◽  
Jing Zhang ◽  
Xiaobing Lu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cross Sections ◽  
Contact Line ◽  
Aerodynamic Coefficients ◽  
Contact Wire ◽  
Linear Finite Element ◽  
Non Linear ◽  
Electrified Railway ◽  
Element Method

Galloping of an electrified railway overhead contact line (also known as catenary galloping) is a large-amplitude wind-induced vibration under extreme conditions that is extremely detrimental to the railway infrastructure. This paper attempts to conduct a numerical simulation of catenary galloping and analyse its galloping behaviour. Computational fluid dynamics is utilized to calculate the aerodynamic coefficients of the contact wire with different classes of wear. The mechanism of catenary galloping is revealed by the Den Hartog theory. To describe the non-linear behaviour of catenary galloping, a non-linear finite element method is employed to establish the catenary model, which properly considers the geometrical non-linearity of the contact/messenger wire and the non-smooth non-linearity of droppers. Considering the effect of fluid-induced vibration, the self-excited forces acting on the contact wire are derived. Through several numerical examples, the galloping responses of the catenary are analysed with different tension classes and stochastic wind. The results demonstrate that the extreme wear of the contact wire caused by the long-term passage of pantograph can change the aerodynamic coefficients of the cross-sections of the contact wire and cause the system’s instability under steady wind load. It is concluded that upgrading the catenary tension class can effectively suppress catenary galloping. The stochastic wind only has small effect on the catenary galloping. The stochastic wind only has small effect on the catenary galloping.

scholarly journals Use of GPR method for contactless measuring of contact wire position in electrified railway

2020 ◽  
Vol 7 ◽  
pp. 100138
Author(s):  
Alexander Kruglikov ◽  
Anton Kasprzhitskii ◽  
Georgy Lazorenko ◽  
Zelimkhan Khakiev ◽  
Victor Yavna
Keyword(s):  
Contact Wire ◽  
Electrified Railway

scholarly journals Railway catenary tension force monitoring via the analysis of wave propagation in cables

2020 ◽  
pp. 095440972094172
Author(s):  
Stefano Derosa ◽  
Petter Nåvik ◽  
Andrea Collina ◽  
Anders Rønnquist
Keyword(s):  
Laboratory Tests ◽  
Vertical Acceleration ◽  
Analytical Formulation ◽  
Contact Wire ◽  
The Status ◽  
Force Monitoring ◽  
Catenary System ◽  
The Wire ◽  
Propagation Of Waves ◽  
The Waves

The tensioning forces applied to the contact wire in a railway catenary system influence the performance of the line. In this paper, a method to monitor the status of such tensioning forces is proposed based on the dependency that the waves that propagate through a tensioned wire have on the forces that pull the wire itself. A novel analytical formulation for the propagation of waves in a tensioned wire was proposed, and it was used to obtain the vertical acceleration of the wire when an external force acts as a concentrated input. The analysis of the acceleration with a moving standard deviation allowed a method to be defined for the generation of an index that describes the trend of the tensioning forces. The method was then tested on the wire accelerations obtained with laboratory tests and, afterwards, on the accelerations recorded on a contact wire of an electric railway regularly in operation and excited with the same kind of input.

scholarly journals Dynamic Performance Simulation and Stable Current Collection Analysis of a Pantograph Catenary System for Trolley Wire Overhead Electrically Actuated LHD

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1015 ◽  
Author(s):  
Yinping Li ◽  
Tianxu Jin ◽  
Li Liu ◽  
Kun Yuan
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Performance ◽  
Element Model ◽  
Contact Wire ◽  
Current Collection ◽  
Electrically Actuated ◽  
Catenary System ◽  
Stable Current ◽  
The Finite Element Model

The pantograph catenary system plays an important role in the power performance of electric mining vehicles. A pantograph catenary system combining both a pantograph and a catenary is one of the most promising solutions. As a case study, this paper discusses the dynamic performance and the stable current collection of a pantograph catenary system for a 14 ton underground overhead wire electrical actuated load, haul, dump machine (LHD). First, based on the optimized finite element simulation process, finite element models of the pantograph system and the catenary system are established. Second, the motion equation of the catenary is improved, and the finite element model of the pantograph catenary system is established. Finally, a dynamic simulation experiment is performed to determine the dynamic performance of the pantograph catenary system. The results show that when the radius of the contact wire is set to 0.00564 m and the tension of contact wire is set to 30 KN, the current collection indexes of the pantograph catenary system meet the requirements of stable current collection and are superior to the simulation results of related references. Therefore, the validity of the finite element model is verified; thus, the pantograph catenary system can stably charge and supply energy for the trolley wire overhead electrically actuated LHD and ensure sufficient power.

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