Dynamic stress prediction in catenary wires for fatigue analysis

doi:10.1201/b21185-159

Cited by 2 publications

(2 citation statements)

References 4 publications

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“…This is used to gain insight on velocity changes associated with reflections and transmissions. Tests detailed in [21] indicate a very low damping close to material properties. Since that is low and constant, no study on damping was performed.…”

Section: Waves Propagating In An Assembly Of Tensioned Wiresmentioning

confidence: 92%

Waves, modes and properties with a major impact on dynamic pantograph-catenary interaction

Van

Massat

Balmès

2017

Journal of Sound and Vibration

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. Waves, modes and properties with a major impact on dynamic pantograph-catenary interaction. Journal of Sound and Vibration, 2017, 402 (août 2017), pp.51-69. 10.1016/j.jsv.2017 Waves, modes and properties with a major impact on dynamic pantograph-catenary interaction AbstractUnderstanding the dynamic behavior of the pantograph-catenary system is crucial for design improvement, but many factors influence the contact force, which is the main design objective. To give a proper understanding of dynamic characteristics, the paper uses a combination of mass drop tests on a catenary, analytic models and parametric finite element model simulations allowing a fine analysis of the influence of train speed. The first contributor to contact force variations is the geometry of the catenary under gravity loading. This parameter is however shown to be insufficient to explain higher frequency effects. The second contributor is the propagation of waves in the contact and messenger wires. The influence of wave dispersion is first demonstrated, which emphasizes the importance of considering the bending stiffness. Wave compensation by droppers and reflections at the mast are then shown to be important. Characteristic times associated with wave group velocities are finally used to explain the series of harmonic contributions visible in spectra in the catenary and pantograph frames. Finally, modes are shown to play a role particularly when their frequencies coincide with other contributions. The notion of mode groups, associated wave velocities and relevant design variables are discussed. Several observations pave the way for future work on catenary design.

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Section: Waves Propagating In An Assembly Of Tensioned Wiresmentioning

confidence: 92%

Waves, modes and properties with a major impact on dynamic pantograph-catenary interaction

Van

Massat

Balmès

2017

Journal of Sound and Vibration

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“…6,7 A growing number of studies have shown that bending fatigue of contact wire has become a significant issue to be taken into account for OLE safety. 8,9 In existing work the vast majority of studies on fatigue in the contact wire have been experimental. Sugahara et al 10 carried out a number of experiments on fatigue life estimation for overhead contact wire with a servo motor configured to apply oscillating force to contact wire.…”

Section: Introductionmentioning

confidence: 99%

A new small sample test configuration for fatigue life estimation of overhead contact wires

Sunar

Fletcher

2022

Proceedings of the Institution of Mechanical Engineers, Part F:

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Fatigue in railway overhead line electrification (OLE) contact wires can cause sudden catastrophic failures. The contact wire interacting with the pantograph both mechanically and electrically is subjected to tension and repetitive bending due to the pantograph contact force. Recently, fatigue failures of OLE have risen in prominence with increases in train speed. To address this a new fatigue test configuration has been developed. The study focuses on a method for testing the wire as a component enabling fatigue life evaluation of worn wires, or exploring the effect of installation damage, through component level evaluation of crack initiation and propagation. The new test configuration places a 400 mm-length contact wire in a combination of bending and pretension with realistic boundary conditions replicating service conditions for longer spans. The results are presented in a strain-life format to provide data for a wide range of potential service conditions.

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Dynamic stress prediction in catenary wires for fatigue analysis

Cited by 2 publications

References 4 publications

Waves, modes and properties with a major impact on dynamic pantograph-catenary interaction

Waves, modes and properties with a major impact on dynamic pantograph-catenary interaction

A new small sample test configuration for fatigue life estimation of overhead contact wires

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