A new nonlinear displacement-dependent parametric model of a high-speed rail pantograph hydraulic damper

Wenlin Wang, Zirong Zhou, Weihua Zhang, Simon Iwnicki

Research output: Contribution to journalArticle

Abstract

A new full parametric model revealing the nonlinear displacement-dependent characteristics of a high-speed rail pantograph damper is developed in this study. In the multi-disciplinary physical modeling, the key pressure-flow characteristics of a changeable resistance network and a compression shim-stack valve are formulated, an equivalent-pressure correction factor, Ce, is proposed to handle the problem of the shim-stack valve experiencing non-uniform pressure fields, and a finite element analysis (FEA) assisted parameter identification approach of Ce is introduced. Considerable agreement between computer simulation and experiment validated the damper model. Extensive pantograph-catenary dynamics simulation and experiment were carried out to compare the pantograph dynamic responses when separately using the conventional linear and the new nonlinear damper models, the results show that when with the nonlinear damper model, the pantograph would have a softer contact with the catenary when it is raised and without prolonging the whole raising time, the operating contact quality of the pantograph and catenary is also obviously improved, and the lowering time of the pantograph would be considerably reduced. The new nonlinear damper model is more complete and adaptive to working conditions of the pantograph than the conventional linear damper model, so it is more advantageous and valuable for modern high-speed problem analysis and parameter optimization of the pantograph-catenary system.
LanguageEnglish
JournalVehicle System Dynamics
DOIs
Publication statusAccepted/In press - 21 Jan 2019

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Pantographs
Rails
Hydraulics
Shims
Computer simulation
Dynamic response
Identification (control systems)
Experiments
Finite element method

Cite this

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title = "A new nonlinear displacement-dependent parametric model of a high-speed rail pantograph hydraulic damper",
abstract = "A new full parametric model revealing the nonlinear displacement-dependent characteristics of a high-speed rail pantograph damper is developed in this study. In the multi-disciplinary physical modeling, the key pressure-flow characteristics of a changeable resistance network and a compression shim-stack valve are formulated, an equivalent-pressure correction factor, Ce, is proposed to handle the problem of the shim-stack valve experiencing non-uniform pressure fields, and a finite element analysis (FEA) assisted parameter identification approach of Ce is introduced. Considerable agreement between computer simulation and experiment validated the damper model. Extensive pantograph-catenary dynamics simulation and experiment were carried out to compare the pantograph dynamic responses when separately using the conventional linear and the new nonlinear damper models, the results show that when with the nonlinear damper model, the pantograph would have a softer contact with the catenary when it is raised and without prolonging the whole raising time, the operating contact quality of the pantograph and catenary is also obviously improved, and the lowering time of the pantograph would be considerably reduced. The new nonlinear damper model is more complete and adaptive to working conditions of the pantograph than the conventional linear damper model, so it is more advantageous and valuable for modern high-speed problem analysis and parameter optimization of the pantograph-catenary system.",
keywords = "Displacement-dependent, nonlinear damping characteristics, pantograph-catenary dynamics, pantograph damper, orifice, parameter identification",
author = "Wenlin Wang and Zirong Zhou and Weihua Zhang and Simon Iwnicki",
year = "2019",
month = "1",
day = "21",
doi = "10.1080/00423114.2019.1578385",
language = "English",
journal = "Vehicle System Dynamics",
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A new nonlinear displacement-dependent parametric model of a high-speed rail pantograph hydraulic damper. / Wang, Wenlin; Zhou, Zirong; Zhang, Weihua; Iwnicki, Simon.

In: Vehicle System Dynamics, 21.01.2019.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Zhou, Zirong

AU - Zhang, Weihua

AU - Iwnicki, Simon

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N2 - A new full parametric model revealing the nonlinear displacement-dependent characteristics of a high-speed rail pantograph damper is developed in this study. In the multi-disciplinary physical modeling, the key pressure-flow characteristics of a changeable resistance network and a compression shim-stack valve are formulated, an equivalent-pressure correction factor, Ce, is proposed to handle the problem of the shim-stack valve experiencing non-uniform pressure fields, and a finite element analysis (FEA) assisted parameter identification approach of Ce is introduced. Considerable agreement between computer simulation and experiment validated the damper model. Extensive pantograph-catenary dynamics simulation and experiment were carried out to compare the pantograph dynamic responses when separately using the conventional linear and the new nonlinear damper models, the results show that when with the nonlinear damper model, the pantograph would have a softer contact with the catenary when it is raised and without prolonging the whole raising time, the operating contact quality of the pantograph and catenary is also obviously improved, and the lowering time of the pantograph would be considerably reduced. The new nonlinear damper model is more complete and adaptive to working conditions of the pantograph than the conventional linear damper model, so it is more advantageous and valuable for modern high-speed problem analysis and parameter optimization of the pantograph-catenary system.

AB - A new full parametric model revealing the nonlinear displacement-dependent characteristics of a high-speed rail pantograph damper is developed in this study. In the multi-disciplinary physical modeling, the key pressure-flow characteristics of a changeable resistance network and a compression shim-stack valve are formulated, an equivalent-pressure correction factor, Ce, is proposed to handle the problem of the shim-stack valve experiencing non-uniform pressure fields, and a finite element analysis (FEA) assisted parameter identification approach of Ce is introduced. Considerable agreement between computer simulation and experiment validated the damper model. Extensive pantograph-catenary dynamics simulation and experiment were carried out to compare the pantograph dynamic responses when separately using the conventional linear and the new nonlinear damper models, the results show that when with the nonlinear damper model, the pantograph would have a softer contact with the catenary when it is raised and without prolonging the whole raising time, the operating contact quality of the pantograph and catenary is also obviously improved, and the lowering time of the pantograph would be considerably reduced. The new nonlinear damper model is more complete and adaptive to working conditions of the pantograph than the conventional linear damper model, so it is more advantageous and valuable for modern high-speed problem analysis and parameter optimization of the pantograph-catenary system.

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