The overhead contact line is a tensioned cable structure erected along the railroad to power electric train. Under wind load, galloping of OCL caused by aerodynamic instability may form large amplitude, which big potential threat normal operation railway. In this paper, tunnel test performed investigate coefficients with two levels wear. can be observed on worn wire at around an 8° angle attack. Employing nonlinear finite element model OCL, reproduced and analysed via several numerical...

The pantograph-catenary system is used in modern electrified railways to power electric trains. Common sense that the increase of train speed leads a deterioration interaction performance. But recent studies indicate higher may result better performance some local regions. This paper first attempt provide theoretical explanation for this phenomenon. A validated model built reproduce Referring definition critical moving load problems, catenary's defined. wavelength components can be extracted...

Galloping of an electrified railway overhead contact line (also known as catenary galloping) is a large-amplitude wind-induced vibration under extreme conditions that extremely detrimental to the infrastructure. This paper attempts conduct numerical simulation galloping and analyse its behaviour. Computational fluid dynamics utilized calculate aerodynamic coefficients wire with different classes wear. The mechanism revealed by Den Hartog theory. To describe non-linear behaviour galloping,...

This paper aims to enhance the speed of rigid overhead systems by investigating impact important parameters system and pantograph on interaction performance, specifically contact force between panhead wire system. To accomplish this, this first builds a model based finite element method. The pantograph–contact simulation is achieved including three-stage lumped mass model. Sobol sensitivity analysis method utilised determine contribution different standard deviation. Subsequently, an...

Due to its long-span structure and large flexibility, an electrified railway catenary is very sensitive environmental wind load, especially the time-varying stochastic wind, which may lead a strong forced vibration of contact line deteriorate current collection quality pantograph–catenary system. In this paper, in order study wind-induced behavior catenary, nonlinear finite element procedure implemented construct model can properly describe deformation nonsmooth nonlinearity dropper. The...

The fluctuation in contact force between the pantograph and catenary severely affects current collection quality of electric multiple units high-speed railway. In particular, when double pantographs operate simultaneously, on trailing (TP) fluctuates violently due to passage leading (LP). To address this problem, a prior-information-based finite-frequency H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">∞</sub> controller, incorporating an...

This paper studies the evolvement of wear irregularity contact wire using thickness data measured yearly from a section railway catenary. The power spectral density and time–frequency representation based on wavelet transform are employed for analysis, with an emphasis local irregularities that crucial condition assessment. To investigate cause mutual influence pantograph–catenary dynamic interaction, simulations considering carried out finite element method. Analyses actual force under...

The numerical tools are widely used to facilitate the design of railway catenary. Only radical results obtained as current assessment is generally performed without any practical errors. In this article, most common error, contact line height variability, appropriately included in evaluating collection quality. Based on real-life data collected from a high-speed network, heights key points extracted, which pointwise stochastics represented by power spectrum density (PSD) function. Random...

Overhead conductor rail (OCR) is an important power supply device in tunnel railway lines. The penalty method widely adopted to model the dynamic interaction behaviour of pantograph-OCR system (POCRs), while it difficult determine a proper contact stiffness value. This paper proposes three-dimensional formulation for POCRs based on Lagrange multiplier method. Accurate forces can be obtained easily by this without trouble determining stiffness. Contact force defined global coordinate as...

Overhead Conductor Rail (OCR) is a power supply device in tunnel railways. This paper aims to investigate the influence of train speed and support stiffness on pantograph-OCR system (POCRs) dynamic behaviour, propose improvement measures existing feeding accommodate higher speeds. Firstly, field test conducted measure equivalent supports currently utilised OCR system. The results are adopted modify model. Subsequently, lumped mass model pantograph considering interlocking joints developed....

Overhead conductor rail (OCR) is widely used in tunnel railway lines to provide continuous energy for electric trains. Current studies mainly focus on the interaction of low-speed pantograph&#x2013;OCR system (POCRs), whereas increase speed poses new challenges power supply locomotives. This article develops a mathematical model based absolute nodal coordinate formulation simulating dynamic behavior POCRs that operates at high speed, integrated with contact wire irregularities (CWIs). The...

This study focuses on developing a comprehensive model of rigid overhead system, which includes essential components such as the suspension structure, positioning clamp, and expansion joint. The modelling approach utilizes finite element theory beam elements to accurately represent displacement, stiffness, mass characteristics system. models also incorporate structure line play crucial roles in suspending busbar. Various structures clamps are evaluated based their dynamic characteristics....

As a common disturbance to the railway pantograph–catenary system, crosswind usually deteriorates current collection quality and threats operational safety. The main topic of this article is evaluate effect on interaction performance considering aerodynamic forces acting both pantograph catenary. system Chengdu–Chongqing passenger special line adopted as analysis object. absolute nodal coordinate formulation (ANCF) employed model numerical accuracy validated via comparison with field...

The electric spark caused by pantograph-catenary (PC) electrical contact failure happens frequently, it is a kind of arcing phenomenon which can severely affect the current collection PC. theoretical analysis and modelling PC are tried. First, spots between their temperature rise analysed derived based on classical theory, respectively. mechanism discharge revealed through voltage difference, model proposed combining with spot formula mechanism. Then, in order to obtain some key parameters...

Railway catenary galloping, induced by aerodynamic instability, poses a significant threat disrupting the electric current connection through sliding contact with wire. This disruption leads to prolonged rail service interruptions and damage catenary’s suspension components. paper delves into exploration of optimizing system’s structure alleviate galloping responses, addressing crucial parameters such as span length, stagger dropper distribution, tension levels. Employing finite element...

Overhead conductor rail (OCR) serves as a crucial device employed in tunnels to power electric locomotives. The OCR is hung by supports mounted on the tunnel ceiling. Previously, support was usually considered linear spring when modelling OCR. stiffness and mass adopted model were imprecise, damping absent. It may be insufficient reproduce pantograph-OCR system (POCR) dynamic behaviour. This paper devoted improving accuracy of POCR makes it more realistic. Field tests are conducted order...

The vibration of the catenary that is initiated by passing pantograph has a direct influence on pantograph-catenary contact performance. Monitoring dynamic uplift can help inspectors to evaluate railway operation conditions and investigate mechanism interaction further. In this paper, non-contact measurement method based deep leaning proposed monitor real-time catenary. field test for free designed validate method's developed fully convolutional Siamese neural network, wire taken as tracking...

With the increase of train speed in electrified railways, increasingly violent interaction pantograph–catenary (PC) makes PC detachment arc an extrusive phenomenon, especially double-pantograph–catenary (DPC) system. Despite a large number research studies have focussed on single pantograph system, DPC system are relatively insufficient. In this paper, arcing phenomenon is studied by combining it with dynamics. First, through analysing double coupled model, contact force and vertical...

The numerical tools can be used to facilitate the design of railway pantograph‐catenary system. validation current results is mostly performed at a speed slower than 350 km/h. This paper aims and analysis super‐high‐speed. catenary model constructed based on nonlinear finite element approach employing absolute nodal coordinate formulation. A multibody dynamics adopted represent pantograph. measurement data are collected by an inspection vehicle equipped with instrumented pantograph operating...

The wave propagation property of the catenary directly affects pantograph–catenary interaction performance. Specifically, reflection and transmission occurring at waveguide discontinuities, particularly dropper junctions, impact In this study, junctions is investigated using both analytical experimental approaches. First, a partial model established to analyze by considering reflections junctions. result indicates that in contact wire (CW) performance more significantly than messenger wire....

When two electric multiple units are non-electrically connected together for improving the transport capacity in high-speed railways, double pantographs frequently operate simultaneously to decrease current on a single pantograph collector. In this case, contact force between trailing and catenary severely fluctuates due wave propagation along triggered by leading pantograph. Therefore, paper proposes estimator-based H ∞ control strategies active double-pantograph fluctuation considering...