Effect of Reduced Reflective Wave Propagation on Overhead Contact Lines in Overlap Section

Hayasaka, Takamasa

doi:10.2219/rtriqr.45.68

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…Different observation points will give different wave shapes, even when all the other parameters are kept constant. From Hayasaka 15 we can establish that a section overlap is one of the points where the pantograph gives the hardest hit to the contact wire. Since this point is known, it is possible then to choose an observation point at a set distance from it in order to define how the wave should be when the tension is the nominal value.…”

Section: Sensor Placementmentioning

confidence: 99%

“…Due to the importance within the catenary dynamics studies, the wave propagation phenomenon has recently attracted much interest. In the literature, examples can be found on the link between wave motion and contact force 14 , on applications for the wave-induced motion reduction 15 and on wave speed evaluation, either with time/frequency analysis of numerical models 16 or from the wire displacement obtained with non-contact measurements on a full-scale laboratory setup 17 . A more recent study 18 evaluated the effects of wave propagation on the vertical velocity of the wire, and a new distributed parameter model 19 and FEM model 20 able to correctly represent the wave propagation has been introduced.…”

Section: Introductionmentioning

confidence: 99%

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Railway catenary tension force monitoring via the analysis of wave propagation in cables

Derosa

Nåvik

Collina

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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The tensioning forces applied to the contact wire in a railway catenary system influence the performance of the line. In this paper, a method to monitor the status of such tensioning forces is proposed based on the dependency that the waves that propagate through a tensioned wire have on the forces that pull the wire itself. A novel analytical formulation for the propagation of waves in a tensioned wire was proposed, and it was used to obtain the vertical acceleration of the wire when an external force acts as a concentrated input. The analysis of the acceleration with a moving standard deviation allowed a method to be defined for the generation of an index that describes the trend of the tensioning forces. The method was then tested on the wire accelerations obtained with laboratory tests and, afterwards, on the accelerations recorded on a contact wire of an electric railway regularly in operation and excited with the same kind of input.

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Section: Sensor Placementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Railway catenary tension force monitoring via the analysis of wave propagation in cables

Derosa

Nåvik

Collina

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…The wave characteristics of the vibration wave of catenary based on the beam model was studied for the first time in [19], and the wave propagation law of vibration wave on the Euler beam was explained in detail. Hayasaka [20] analyzed the incident and reflection processes of vibration wave of contact wire at the joint of the catenary anchor segment based on the principle of row wave mechanics, and proposed that a damper should be installed at the joint of the anchor segment to reduce the wave amplitude of the fluctuation of contact wire, so as to improve the current collection quality between pantograph and catenary. Cho et al [21] adopted a finite element method to verify that the fluctuation velocity of high-frequency vibration was larger than that of low-frequency vibration in catenary, and proposed a nonlinear suspender model.…”

Section: Figure 1 Schematic Of Pantograph-catenary Sliding Electric mentioning

confidence: 99%

“…In general, the damping coefficient C of contact wire or messenger wire is very small, which can be ignored [10], [20]. In other words, when ζ= 0, the theoretical formula of FVC is…”

Section: Fvc Under the Euler Beam Modelmentioning

confidence: 99%

Improved Study on the Fluctuation Velocity of High-Speed Railway Catenary Considering the Influence of Accessory Parts

et al. 2020

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To improve the prediction accuracy of the wave propagation velocity of high-speed railway catenary, a method for identifying the fluctuation velocity of catenary (FVC) considering the influence of the accessory parts of catenary (APC) is proposed. Based on the classical Bernoulli-Euler beam vibration model, the single Euler beam model under ideal conditions is improved considering the influence of the inertial forces exerted by accessory parts on the catenary. The calculation expression of FVC considering the influence of APC is deduced according to the theory of elastomer vibration mechanics. The key parameters α and β that affect the FVC are obtained, and the relation curves between the fluctuation velocity and the key parameters α and β are analyzed respectively. Through the fluctuation velocity test for the actual catenary, the theoretical fluctuation velocity of contact wire considering the influence of APC are compared and verified with the measured fluctuation velocity. Research results show that the relative error between the theoretical fluctuation velocity obtained from the modified fluctuation velocity expression of contact wire considering the influence of APC and the measured fluctuation velocity is less than 10%. Compared with the fluctuation velocity theoretical formula based on the string/cable and Euler beam theory, the modified expression of the fluctuation velocity of contact wire (FVCW) is more accurate in identifying the FVCW, and the recognition accuracy is increased by 3.75%, which verifies the accuracy of the recognition method and provides a more accurate theoretical basis of fluctuation velocity for designing the structural parameters of catenary.

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“…When more than one pantograph is collecting current, Manabe and Fujii 19 found that the catenary internal resonance will arise under certain conditions. By presuming the formulas of propagation waves in the transition section between two catenary spans, Hayasaka 20 derived the constraint conditions of the damper parameters to achieve a desired nonreflective boundary. From the literature mentioned above, it can be noted that the researches of catenary wave propagation were either based on the simple beam model or based on a prior assumption of the wave motion, and the studies of wave propagation upon a real catenary are quite rare.…”

Section: Introductionmentioning

confidence: 99%

Experimental and simulation study of wave motion upon railway overhead wire systems

Zou

Zhou

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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To study the railway overhead wire's flexural wave motion that significantly affects the quality of current collection between pantograph and catenary, dynamic responses of a real catenary excited by different excitations are measured and analyzed by using a set of noncontact photogrammetric devices together with the finite-element simulation. Based on the measured and simulated results, the wave motion along the contact wire is investigated and some findings have been obtained. First, it is the first two dominant modal components in the catenary displacement responses that induce a beat phenomenon, and this beat phenomenon is increasingly obvious near the registration arm. Moreover, with the simulated displacement contour, catenary local vibration characteristics affected by the travelling wave can be clearly interpreted. Furthermore, the wave group velocity of contact wire in catenary is determined and verified to be approximately 139.18 m/s; in addition, treating the contact wire in the overhead wire system as an ideal string or a tensioned Euler beam will overestimate the corresponding group velocity with a relative error by about 13.21%.

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Effect of Reduced Reflective Wave Propagation on Overhead Contact Lines in Overlap Section

Cited by 8 publications

References 1 publication

Railway catenary tension force monitoring via the analysis of wave propagation in cables

Railway catenary tension force monitoring via the analysis of wave propagation in cables

Improved Study on the Fluctuation Velocity of High-Speed Railway Catenary Considering the Influence of Accessory Parts

Experimental and simulation study of wave motion upon railway overhead wire systems

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