FG Schienenfahrzeuge

16 Items

Recent Submissions
New control approaches to improve contact quality in the conventional spans and overlap section in a high-speed catenary system

Vesali, Farzad ; Molatefi, Habibollah ; Rezvani, Mohammad A. ; Moaveni, Bijan ; Hecht, Markus (2019-01-10)

Continuous and quality contact between the pantograph and the catenary system is one of the major challenges for increasing the speed of electric trains. Compared to other studies, this paper has considered the catenary system as the main system and has assumed the pantograph as an excitation factor. Based on this, a controller has been applied on the contact wire, once at the last span and ano...

Reducing wheel wear from the perspective of rail track layout optimization

Ye, Yunguang ; Sun, Yu (2021-06-01)

Wheel wear (W-wear) is one of the most critical issues affecting vehicle-track performances and operating costs. Currently, the works on W-wear behavior and W-wear reduction are mainly based on four aspects: wheel-rail (WR) tribology, WR profile, vehicle structure design and active control of vehicle suspensions. Little attention has been paid to the effects of track layout parameters, such as ...

Quantification of the influence of rolling stock failures on track deterioration

Ye, Yun-guang ; Shi, Da-chuan ; Poveda-Reyes, Sara ; Hecht, Markus (2020-10-24)

This study focuses on the quantification of the influence of rolling stock failures (RSFs) on railway infrastructure. Taking the wheel flat, a common RSF, as an example, we introduce four quantification indexes to evaluate the influence on the following four deterioration mechanisms: track settlement (TS), track component fatigue (TCF), abrasive wear (AW), and rolling contact fatigue (RCF). Our...

Optimizing wheel profiles and suspensions for railway vehicles operating on specific lines to reduce wheel wear: a case study

Ye, Yunguang ; Sun, Yu ; Dongfang, Shiping ; Shi, Dachuan ; Hecht, Markus (2020-01-16)

The selection of a wheel profile is a topic of great interest as it can affect running performances and wheel wear, which needs to be determined based on the actual operational line. Most existing studies, however, aim to improve running performances or reduce contact forces/wear/rolling contact fatigue (RCF) on curves with ideal radii, with little attention to the track layout parameters, incl...

Visual Measurement System for Wheel−Rail Lateral Position Evaluation

Skrickij, Viktor ; Šabanovič, Eldar ; Shi, Dachuan ; Ricci, Stefano ; Rizzetto, Luca ; Bureika, Gintautas (2021-02-11)

Railway infrastructure must meet safety requirements concerning its construction and operation. Track geometry monitoring is one of the most important activities in maintaining the steady technical conditions of rail infrastructure. Commonly, it is performed using complex measurement equipment installed on track-recording coaches. Existing low-cost inertial sensor-based measurement systems prov...

An integrated numerical framework to investigate the running safety of overlong freight trains

Krishna, Visakh V. ; Jobstfinke, Daniel ; Melzi, Stefano ; Berg, Mats (2021-01-01)

Long freight trains up to 1500 m in length are currently not in regular operation in Europe. One of the important reasons for the same is high inter-wagon forces generated during the operation, especially when pneumatic (P-type) brake systems are used. For long trains with multiple locomotives at different positions along the train, radio communication with necessary fail-safe mechanisms can be...

Small-amplitude hunting diagnosis method for high-speed trains based on the bogie frame’s lateral–longitudinal–vertical data fusion, independent mode function reconstruction and linear local tangent space alignment

Ye, Yunguang ; Ning, Jing (2019-01-29)

Hunting stability is an important factor that influences the running safety of high-speed trains. Most of the existing hunting monitoring methods monitor only the standard hunting. The small-amplitude hunting, however, not only affects ride comfort but also aggravates the wheel–rail wear. Therefore, to extend the service life of wheels and rails and to improve the ride comfort, it is extremely ...

Static form-finding of normal and defective catenaries based on the analytical exact solution of the tensile Euler–Bernoulli beam

Vesali, Farzad ; Rezvani, Mohammad Ali ; Molatefi, Habibolah ; Hecht, Markus (2018-11-16)

The aim of this research is to propose and develop an analytical exact solution for finding the static equilibrium configuration of a catenary before and after incurring defects such as tension loss or a broken dropper. The procedure includes considering the steady-state solution of the dynamic motion equation of the contact wire and the messenger cable. The wire and the cable are considered as...

Güterzuglängsdynamik

Jobstfinke, Daniel (2020)

Mehrere aktuelle und perspektivische Entwicklungen im Eisenbahnwesen haben potenziellen Einfluss auf die Längsdynamik von Güterzügen. Dazu gehören die Einführung einer Digitalen Automatischen Kupplung, längere Güterzüge sowie neuartige Bremssysteme. Bestehende Untersuchungen beschränken sich teilweise auf wenige Zugkonfigurationen und/oder Betriebsszenarien. Praktisch gibt es aber nahezu unbeg...

Triebwagen für den zukünftigen Nah- und Regionalverkehr in Deutschland

Künzel, Thomas (2019)

Das Ziel der vorliegenden Arbeit ist die Analyse, welche Fahrzeugkonzepte im Nah- und Regionalverkehr der Zukunft in Deutschland zur Anwendung kommen werden. Anhand von verschiedenen Kennziffern wird untersucht, welche der betrachteten Fahrzeugkonzepte signifikante, konzeptionelle Vorteile gegenüber anderen Typen aufweisen. Aufgrund der ermittelten Kennziffern wird die These aufgestellt, dass...

Effect of suspension system in the lateral stability of railway freight trucks

Molatefi, Habibollah ; Hecht, Markus ; Kadivar, M. H. (2007)

In the current research an empty freight wagon with BA652 and an old BA661 bogies have been modelled. Non-linear creep forces with spin moment between wheel and rail have been used and also all impacts and friction forces have been modelled. The characteristics of primary suspension systems for BA652 and an old BA661 have been evaluated by means of test. Non-linear equations of motions and kine...

Critical speed and limit cycles in the empty Y25-freight wagon

Molatefi, Habibollah ; Hecht, Markus ; Kadivar, M. H. (2006)

In this research, an empty freight wagon with Y25 bogies have been modelled. Non-linear creep forces with spin moment between wheel and rail have been used, and also all impacts and friction forces have been modelled. Non-linear equations of motion and kinematical constraints have been solved in time domain, and limit cycles, saddle nodes, and critical speeds have been shown. Both primary and s...

Wear and energy-saving freight bogie designs with rubber primary springs: principles and experiences

Hecht, Markus (2009)

The traditional radial steering bogie with swing hanger links is known to be track-friendly but heavy, and expensive in investment and maintenance costs. Whereas the actual bogies with longitudinal stiff axle guidance such as Y25 cause severe wear on wheels and rails in curves, and also develop high running resistance in curves. Bogies with rubbers springs like double rubber ring spring (DRRS),...

European freight vehicle running gear: Today's position and future demands

Hecht, Markus (2001)

The running gear of most of the rail freight vehicles in operation today tends to be built to very old designs. The running gear for new freight rolling stock and, in particular, new types of bogie must have significantly improved performance if they are to satisfy the demands of all the stakeholders associated with the railways. Improved performance in this context means reduced inspection tim...

Zukunftskonzept virtuelle Kupplung

Rüsch, Franziska (2018)

Die betriebliche baureihen- und herstellerübergreifende Kuppelbarkeit (Multikuppelbarkeit) von Triebfahrzeugen im Schienenpersonennahverkehr (SPNV) erhöht die betriebliche Flexibilität im Fahrzeugeinsatz und verbessert dessen Wirtschaftlichkeit. Für die Gestaltung eines zukunftsfähigen SPNV gilt die Multikuppelbarkeit daher, insbesondere bei den Eisenbahnverkehrsunternehmen und Aufgabenträgern,...

Validation of simulation models in the context of railway vehicle acceptance

Polach, Oldrich ; Böttcher, Andreas ; Vannucci, Dario ; Sima, Jürgen ; Schelle, Henning ; Chollet, Hugues ; Götz, Gernoth ; Garcia Prada, Mayi ; Nicklisch, Dirk ; Mazzola, Laura ; Berg, Mats ; Osman, Martin (2015)

The evaluation of a reliable validation method, criteria and limit values suitable for model validation in the context of vehicle acceptance was one of the objectives of the DynoTRAIN project. The presented investigations represent a unique amount of testing, simulations, comparisons with measurements, and validation evaluations. The on-track measurements performed in four European countries in...