Identification of system damping in railway catenary wire systems from full-scale measurements

Nåvik, Petter; Rönnquist, Anders; Stichel, Sebastian

doi:10.1016/j.engstruct.2016.01.031

Cited by 41 publications

(31 citation statements)

References 27 publications

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“…To reproduce the realistic defects of catenary, the contact wire irregularities [12], [13], dropper defect [14] and wear [15] are included in the assessment of current collection quality. To ensure the accuracy of simulation results, the measurement data from field tests are utilised to modify [16] and validate [17], [18] the numerical models. The hardware-in-the-loop technique has been widely developed to couple a mimic catenary and realistic pantograph [19], which provide more convincing measured results to analyse the pantograph behaviour.…”

Section: B Literature Reviewmentioning

confidence: 99%

Assessment of the High-Frequency Response in Railway Pantograph-Catenary Interaction Based on Numerical Simulation

Song

Rönnquist

Nåvik

2020

IEEE Trans. Veh. Technol.

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The numerical model is a well-acknowledged tool to evaluate railway pantograph-catenary interaction performance. The current standard restricts most current simulation tools by a cutoff frequency of 20 Hz. This low-frequency range of interest cannot fully describe the current collection quality of pantographcatenary. This paper includes simulation with cutoff frequencies up to 200 Hz to investigate the high-frequency behaviour of pantograph-catenary interaction. The reference model of pantograph-catenary in the benchmark is taken as the analysis object. Firstly, the effect of key simulation parameters of the resulting contact force is investigated. A small element length in the finite element model is proposed to prevent the frequency range of interest being contaminated by the numerical error. The contact stiffness has an opposite effect on the contact force in low and high-frequency ranges. Then the source and the amplification factor of high-frequency components of contact force are investigated. The results show that the half and quarter of the dropper/steady arm interval length presents the primary source of high-frequency components of the contact force. The corresponding wavelength can also be found in the high-order modes of the catenary. Finally, a variable time step procedure is also proposed to capture the contact loss occurring at high frequencies accurately. The comparison of the results between the variable and constant time steps indicates that the traditional constant time step may result in errors when calculating the contact loss duration.

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Section: B Literature Reviewmentioning

confidence: 99%

Assessment of the High-Frequency Response in Railway Pantograph-Catenary Interaction Based on Numerical Simulation

Song

Rönnquist

Nåvik

2020

IEEE Trans. Veh. Technol.

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“…Note that all of the damping ratios only correspond to the first frequency component in the signals, as shown in Figure 16 . The damping ratios of catenary sections exhibited larger variation with the geometric structure, and also exhibited obvious differences with different measurement distances [ 22 ]. From Table 5 , it is evident that larger damping ratios occur for larger distances, and the damping ratios change nonlinearly with the change of distances to the excitation position.…”

Section: Validation Through a Field Testmentioning

confidence: 99%

“…Currently, there are two main methods for pantograph–catenary condition measurement: Non-contact methods based on image processing and contact-type schemes based on sensors installed in the system. In previous years, contact-type schemes have been widely used in railway condition detection, such as contact force collection [ 20 , 21 ] and acceleration collection [ 22 , 23 ]. However, these approaches require parts of the measurement system to be installed on the catenary structure, which means that the railway traffic will be interrupted and measurement will take a more substantial amount of time.…”

Section: Introductionmentioning

confidence: 99%

A Siamese Network-Based Non-Contact Measurement Method for Railway Catenary Uplift Trained in a Free Vibration Test

Duan

Liu

Zhai

et al. 2020

Sensors

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The vibration of the catenary that is initiated by the passing pantograph has a direct influence on the pantograph–catenary contact performance. Monitoring the dynamic uplift of the catenary can help inspectors to evaluate the railway operation conditions and investigate the mechanism of pantograph–catenary interaction further. In this paper, a non-contact measurement method based on the deep leaning method is proposed to monitor the real-time vibration of the catenary. The field test for the catenary free vibration is designed to validate the method’s performance. The measurement method is developed based on the fully convolutional Siamese neural network, and the contact wire is taken as the tracking target. To reduce the recognition errors caused by the changes in the shape and grayscale of the moving contact wire in images, the class-agnostic binary segmentation mask is adopted. A developed down-sampling block is used in the neural network to reduce the image feature loss, which effectively enhances the recognition effect for the catenary vibration under variable lighting conditions. To validate the performance of the proposed measurement method, a series of field tests of catenary free vibration were conducted under various lighting conditions and different excitations, and the recognition results were compared with traditional target tracking methods. The results show that the proposed method performs well for catenary vibration identification in the field test. Additionally, the uplift data extracted from the identified images agree with the numerical results, and also help to further investigate the wave propagation and damping characteristics in the catenary structure.

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“…The hardware-in-the-loop hybrid simulations of pantographcatenary interaction is also another approach to find improved dynamic performance for the two systems [20,21]. Also, research on the identification and influence of catenary damping, shown as very important for the interaction quality [22], was performed to improve catenary models [23]. The pantograph-catenary benchmarks, [24,25], and its associated references portrait the state-of-the-art of existing numerical analysis tools, developed by world leading research institutions.…”

Section: Introductionmentioning

confidence: 99%

A new methodology to study the pantograph–catenary dynamics in curved railway tracks

Antunes

Ambrósio

Pombo

et al. 2019

Vehicle System Dynamics

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The pantograph-catenary system is responsible to provide an uninterrupted energy supply to power electric traction railway vehicles. The analysis of the dynamic behaviour of the catenary and pantograph, as well as its interaction, has been object of active research to improve the energy collection quality. This work proposes an approach for the fully three-dimensional dynamic analysis of pantograph-catenary interaction in general railway tracks including curves. Both the catenary model and the trajectory of the pantograph base are defined with respect to the track geometry considering the conventional definition used by the rail industry, i.e., curvature, cross level and vertical position of the track. The pantograph is modelled using a 3D multibody formulation being its base motion constrained to follow the generalized trajectory from the top of a railway vehicle. The finite element method is used to model the catenary. A co-simulation procedure is set to allow for the coupled dynamics of the two systems. In order to demonstrate the methodology, setting up models for curved catenaries, analyse their modelling implications and highlight applicability, realistic case studies of pantograph-catenary interaction in high-speed rail operations are presented and discussed. In the process there are found significant differences on the dynamic response of the catenary in curved and straight tracks.

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Identification of system damping in railway catenary wire systems from full-scale measurements

Cited by 41 publications

References 27 publications

Assessment of the High-Frequency Response in Railway Pantograph-Catenary Interaction Based on Numerical Simulation

Assessment of the High-Frequency Response in Railway Pantograph-Catenary Interaction Based on Numerical Simulation

A Siamese Network-Based Non-Contact Measurement Method for Railway Catenary Uplift Trained in a Free Vibration Test

A new methodology to study the pantograph–catenary dynamics in curved railway tracks

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