Stochastic Monte Carlo simulations of the pantograph–catenary dynamic interaction to allow for uncertainties introduced during catenary installation

Gregori, S.; Tur, M.; Tarancón, J. E.; Fuenmayor, F. J.

doi:10.1080/00423114.2018.1473617

Cited by 24 publications

(14 citation statements)

References 24 publications

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“…The scientific community has recognised that most unsatisfactory behaviours (such as contact loss and overlarge maximum contact force) primarily happened at high frequency. Therefore, the assumption is desired to be improved, and a nonlinear beam element should be used to describe the catenary's high-frequency behaviour [24] entirely. In [24], the catenary's geometry deviation was included in the catenary model to assess the pantograph-catenary interaction performance.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the assumption is desired to be improved, and a nonlinear beam element should be used to describe the catenary's high-frequency behaviour [24] entirely. In [24], the catenary's geometry deviation was included in the catenary model to assess the pantograph-catenary interaction performance. Nevertheless, the target configuration cannot be ensured to be the same as reality as the measurement geometry was not provided.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the Current Collection Quality of Pantograph–Catenary With Contact Line Height Variability in Electric Railways

Song

Duan

Wu³

et al. 2022

IEEE Trans. Transp. Electrific.

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The numerical tools are widely used to facilitate the design of the railway catenary. Only radical results are obtained as the current assessment is generally performed without any practical errors. In this paper, the most common error, the contact line height variability, is appropriately included in evaluating the current collection quality. Based on the real-life contact line height data collected from a high-speed network, the heights of the key points in the contact line are extracted, of which the pointwise stochastics is represented by the PSD function. Random samples are generated by the inverse Fourier transform based on the Monte Carlo method. An advanced initialisation procedure is presented to properly include the contact line height variability in the initial configuration. A stochastic analysis with a high cut-off frequency is performed to evaluate a double pantographs-catenary system's current collection quality. Unlike the deterministic result obtained by the perfect design data, the contact line height variability causes uncertainty. The present analysis method indicates some risks of safety accident and contact loss which the traditional simulation cannot capture with ideal design data or low cut-off frequency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of the Current Collection Quality of Pantograph–Catenary With Contact Line Height Variability in Electric Railways

Song

Duan

Wu³

et al. 2022

IEEE Trans. Transp. Electrific.

View full text Add to dashboard Cite

show abstract

“…Based on this idea, the defective droppers [19,20], irregularity [21], contact wire wear [22] and the tension variation [23] are correctly modelled and included in the assessment of pantographcatenary interaction. It is worthwhile to mention the works of Van et al [24] and Gregori et al [25]. The geometry deviation is considered in these two works when modelling the catenary, and the results indicate that the geometry deviation leads to a particular dispersion of the response.…”

Section: Introductionmentioning

confidence: 99%

Geometry deviation effects of railway catenaries on pantograph–catenary interaction: a case study in Norwegian Railway System

et al. 2021

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This paper presents a non-contact measurement of the realistic catenary geometry deviation in the Norwegian railway network through a laser rangefinder. The random geometry deviation is included in the catenary model to investigate its effect on the pantograph–catenary interaction. The dispersion of the longitudinal deviation is assumed to follow a Gaussian distribution. A power spectrum density represents the vertical deviation in the contact wire. Based on the Monte Carlo method, several geometry deviation samples are generated and included in the catenary model. A lumped mass pantograph with flexible collectors is employed to reproduce the high-frequency behaviours. The stochastic analysis results indicate that the catenary geometry deviation causes a significant dispersion of the pantograph–catenary interaction response. The contact force standard deviations measured by the inspection vehicle are within the scope of the simulation results. A critical cut-off frequency that covers 1/16 of the dropper interval is suggested to fully describe the effect of the catenary geometry deviation on the contact force. The statistical minimum contact force is recommended to be modified according to the tolerant contact loss rate at high frequency. An unpleasant interaction performance of the pantograph–catenary can be expected at the catenary top speed when the random catenary geometry deviation is included.

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“…In order to ensure a stable contact force, the pantograph-OCL system should be appropriately designed. Many numerical models of the OCL have been developed to reproduce the realistic behaviour [13][14][15] and explore the implications of design parameters on the dynamic performance [16][17][18]. Based on these simulation tools, several optimisation strategies are proposed to reduce the elasticity unevenness of OCL [19], decrease the wave propagation interference [20], and avoid the resonance with pantographs [21].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on the Wind Deflection of Railway Overhead Contact Line Based on Empirical Formula and Finite Element Approach

Chu

Song

Liu

2021

Shock and Vibration

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The assessment of wind deflection of the railway overhead contact line (OCL) is of great importance to ensure the safe and reliable operation of the electrified railway. This paper performs a comparative study of the railway OCL wind deflection based on the traditional empirical formula and finite element method (FEM). Considering the geometrical nonlinearity, a nonlinear finite element approach is adopted to model the OCL. The crosswind load is applied to the OCL through an iterative procedure. The comparative study indicates that the maximum wind deflection estimated by the empirical formula is generally the same as the FEM result when the turbulence intensity is 10%. However, with more than 10% of the turbulence intensity, the empirical formula may give a risky result. Then, some coefficients are introduced to modify the empirical formula according to the FEM results. The numerical examples are presented with different OCL tension classes to verify the validation of the modified empirical formula.

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Stochastic Monte Carlo simulations of the pantograph–catenary dynamic interaction to allow for uncertainties introduced during catenary installation

Abstract: Stochastic Monte Carlo simulations of the pantograph-catenary dynamic interaction to allow for uncertainties introduced during catenary installation. Vehicle System Dynamics. 57(4):471-492.

Cited by 24 publications

References 24 publications

Assessment of the Current Collection Quality of Pantograph–Catenary With Contact Line Height Variability in Electric Railways

Assessment of the Current Collection Quality of Pantograph–Catenary With Contact Line Height Variability in Electric Railways

Geometry deviation effects of railway catenaries on pantograph–catenary interaction: a case study in Norwegian Railway System

A Comparative Study on the Wind Deflection of Railway Overhead Contact Line Based on Empirical Formula and Finite Element Approach

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