Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Dynamic optimization of railway catenary system by turning unwanted lumped-mass into tuned-mass
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles. (SDB)
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
NTNU Norwegian University of Science and Technology.
2017 (English)In: Dynamic optimization of railway catenary system by turning unwanted lumped-mass into tuned-mass, 2017Conference paper, Published paper (Refereed)
Abstract [en]

The railway catenary is suspended to its supports with droppers, clamps and oth-er fittings. These lumped-masses are made light and small to minimize disturbances. The mass-es cannot be completely removed but can be adjusted during maintenance. In other technical systems, artificial mass is used to improve the dynamic behaviour. Therefore, in this study the relationship between the lumped-mass distribution and its dynamic behaviour is investigated. Based on a 3D pantograph-catenary finite element (FE) model, a parametric study on the lumped-mass distribution on the Swedish soft catenary system is performed by applying addi-tional lumped-mass to different positions. It is shown that the mass distribution affects the dy-namic performance and in some cases, can improve the dynamic performance. The influence becomes stronger in multi-pantograph operation. Installing these masses on the messenger wire can avoid hard-point effects. In this way, the artificial mass can be used to improve the dynamic performance or correct some structural defects.

Place, publisher, year, edition, pages
2017.
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-214461OAI: oai:DiVA.org:kth-214461DiVA, id: diva2:1141212
Conference
The 25th International Symposium on Dynamics of Vehicles on Roads and Tracks IAVSD 2017
Note

QC 20170915

Available from: 2017-09-14 Created: 2017-09-14 Last updated: 2017-10-09Bibliographically approved
In thesis
1. Measures to Enhance the Dynamic Performance of Railway Catenaries
Open this publication in new window or tab >>Measures to Enhance the Dynamic Performance of Railway Catenaries
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The pantograph-catenary system is used in railways to transfer electric power from infrastructure to trainset. As the pantograph slides against the catenary, the contact between the two surfaces is not stable due to stiffness variation, propagating wave and other environmental perturbation, especially at high speeds or in multi-pantograph operation. Heavy oscillation can result in poor power-transmission quality, electromagnetic interference, severe wear or even structural damage. So the pantograph-catenary dynamics has become one of the key issues which limits the operational speed and determines the maintenance cost. There are many types of catenary systems in Sweden, which are relatively soft and sensitive compared with the systems in other countries. They work well at low operational speed and have strict limitations to multi-pantograph operation. It is possible to achieve an operational speed of 350 km/h on newly-built high-speed lines, but there is still a large demand for higher operational speed and more capacity on the existing lines.

    Many researchers and engineers have made progress to improve its dynamic performance. From the research aspect, many numerical models have been built up to demonstrate the dynamics of the pantograph-catenary system and to unveil the key influencing factors. There have been many applications developed in recent years. Regarding the catenary, high-tensile loads on the catenary and low-stiffness-variation designs are widely used to improve the dynamic performance. Regarding the pantograph, aerodynamic-friendly designs and active-control technique contribute to the development of high-speed pantograph. But all these methods need not only large investment but long out-of-service. Considering the large scale and heavy service duty of the existing lines, it becomes almost impossible to completely upgrade the existing pantograph-catenary systems. So it is necessary to find practical and efficient methods to exploit the potentials of the existing systems to enhance their dynamic performances.

    This thesis investigates the dynamic behaviour of the Swedish pantograph-catenary systems and proposes methods for better usage. A numerical study on multi-pantograph operation is performed and the relationships between dynamic performance and some key parameters is established. By studying the multi-pantograph operation at short spacing distance, a method to use the leading pantograph as auxiliary pantograph is proposed to increase the operational speed on the soft catenary system. To ensure operational safety in abnormal conditions, numerical studies on pantograph raising/lowering processes and in catenary overlap sections are performed. By studying the influence of the lumped-mass on the dynamic performance, it shows that it is even possible to implement some artificial tuned-masses on the catenary for dynamic optimization.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. p. 42
Series
TRITA-AVE, ISSN 1651-7660 ; 2017:60
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-214464 (URN)978-91-7729-524-2 (ISBN)
Public defence
2017-10-18, F3, Lindstedtsvägen 26, stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170915

Available from: 2017-09-15 Created: 2017-09-14 Last updated: 2017-09-15Bibliographically approved

Open Access in DiVA

No full text in DiVA

Search in DiVA

By author/editor
Liu, ZhendongStichel, Sebastian
By organisation
Rail Vehicles
Vehicle Engineering

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 135 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf