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

Abstract

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.

Validation and Analysis on Numerical Response of Super‐High‐Speed Railway Pantograph‐Catenary Interaction Based on Experimental Test

“…Apart from the simulation in ideal working conditions, the environmental perturbations and the pantograph-catenary errors are appropriately modelled to investigate their effect on the current collection quality. e wind field along the catenary was constructed [25,26], and the buffeting behavior was analyzed in [27]. e traditional vortex-induced vibration in bridge engineering [28] was not the main issue for railway catenary.…”

Crosswind Effects on Interaction Performance of High-speed Railway Pantograph-catenary System: A Case Study in Chengdu-Chongqing Passenger Special Railway

“…But the stochastics of the wind load is not taken into account. In [28], the Pseudo-Excitation Method is used to evaluate the dispersion of the catenary response subjected to a crosswind. However, the geometrical nonlinearity and dropper slackness cannot be involved in a response spectrum analysis method.…”

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

“…To achieve convincing numerical results, the measurement data from field tests are utilised to modify and validate numerical models, which has prompted new measurement and identification techniques [10,11]. Another state of the art is to digitalise the external disturbance from vehicletrack [12,13], wind load [14] and other experimental factors and adequately include them in the numerical model. In order to improve the numerical efficiency, some scholars have devoted their attention to developing fast simulation techniques, such as the moving mesh [15], moving window [16] and offline integration method [17].…”