The aim of the paper is to highlight the influence of the deformable modes of the collector of high-speed pantograph on the quality of current collection. The study was first conducted with an experimental survey on a few collectors for high-speed pantographs, in order to determine their modal parameters and dynamic responses in relation with their structures. Subsequently, a comparison with finite-element modelling was performed, comparing the calculated natural frequencies and mode shapes with the measured ones. Finally, the influence of the deformable modes on the dynamic interaction between pantograph and catenary was analysed, using a simulation model developed in previous works, incorporating the deformable modes of the collector into the model of the pantograph, by means of the experimentally defined modal parameters. The objective of this analysis was to investigate, in particular, the effect of the contact wire irregularity on the contact force up to 100 Hz.
This paper discusses the possibility of using computational fluid dynamics (CFD) to assess the influence of aerodynamic\ud
forces (aerodynamic uplift) on the mean contact force acting between a pantograph and the contact wire. The analysis\ud
consists of experimental tests and CFD simulations, performed in both wind tunnel and on-track scenarios. A method\ud
for the computation of the aerodynamic uplift and for the assessment of the contact force imbalance between the leading\ud
and trailing collectors is proposed. The method is based on the virtual work principle, and exploits both the numerical\ud
forces resulting from CFD analysis, and the Jacobian terms obtained from a kinematic analysis of the pantograph. The\ud
proposed model takes into account stationary phenomena, and it is fully validated by means of experimental results
This paper describes a diagnostic system for overhead line monitoring; it is based on the measurement of collector accelerations, and aimed at improving current scheduled methods for catenary and pantograph maintenance, making condition-based maintenance possible. The proposed setup is inexpensive and easy to install on in-service commercial trains. Meaningful indicators of pantograph/catenary interactions are obtained by the processing and analysis of data on collector accelerations; summarized values are computed in real-time during the train run and compared with alarm limits
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