Abstract
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.
Highlights
In electrified railway systems, the catenary constructed along the railroad is used to power the electric train
This paper presents a non-contact measurement of the realistic catenary geometry deviation in the Norwegian railway network through a laser rangefinder
This paper presents a field measurement of the catenary geometry from the Norwegian railway network, providing realistic catenary geometry data for the numerical simulation
Summary
The catenary constructed along the railroad is used to power the electric train. 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]. The modelling of degradation has been an emerging technique to utilise the numerical model to predict service performance [18] 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 pantograph– catenary interaction. Some works that attempt to include a random geometry deviation in the catenary model lack the support of measured geometry data.
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