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 track stiffness measurement: a new tool for condition monitoring of track substructure
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , x, 26 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2005:14
Keyword [en]
Technology, track stiffness, track maintenance, soil dynamics, measurement
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-341ISBN: 91-7283-806-X (print)OAI: oai:DiVA.org:kth-341DiVA: diva2:9206
Presentation
2005-06-01, seminarierum S40, Teknikringen 8, Stockholm, 10:15
Note
QC 20101123Available from: 2005-08-01 Created: 2005-08-01 Last updated: 2010-11-23Bibliographically approved
List of papers
1. Continuous Track Stiffness Measurement: An Effective Method To Investigate The Structural Conditions Of The Track
Open this publication in new window or tab >>Continuous Track Stiffness Measurement: An Effective Method To Investigate The Structural Conditions Of The Track
2002 (English)In: Railway Engineering Conference, 2002Conference paper, Published paper (Refereed)
Abstract [en]

Vertical track stiffness and its variations along the track are important parameters that affect the conditionof the track, in particular the deterioration of track geometry and ballast degradation. The track stiffness isalso an important factor that has to be considered when upgrading the track for traffic of higher axle loads and higher speeds. Within the EU project EUROBALT II, Banverket (Swedish National Rail Administration) has developed a method to continuously measure the vertical track stiffness. Recently,Banverket has made further improvement of the method and carried out extensive measurements in Sweden using our track-loading test vehicle. Different combinations of excitation frequency and speedhave been tested. The measurement results have shown a significant correlation with actual geotechnical conditions and depth of soil layers. The measurement method has also shown very good repeatability. In this paper, we introduce the method of continuous track stiffness measurement and report the promising results we have obtained. It can be concluded that the continuous track stiffness measurement provides an effective way to investigate the structural condition of the track and should be a very useful tool for determining the cause of certain track problems.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-10346 (URN)
Note
QC 20100623Available from: 2009-05-07 Created: 2009-05-07 Last updated: 2010-11-23Bibliographically approved
2. Mitigation of track vibration at Ledsgård Sweden, Field Measurements Before and After Soil Impovement
Open this publication in new window or tab >>Mitigation of track vibration at Ledsgård Sweden, Field Measurements Before and After Soil Impovement
2002 (English)In: Structural Dynamics, 2002Conference paper, Published paper (Refereed)
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-26355 (URN)
Conference
The 4th International Conference on Structural Dynamics, Munich, Germany, 2-5 September 2002
Note
QC 20101123Available from: 2010-11-23 Created: 2010-11-23 Last updated: 2010-11-23Bibliographically approved
3. Track-substructure investigations using ground penetrating radar and track loading vehicle
Open this publication in new window or tab >>Track-substructure investigations using ground penetrating radar and track loading vehicle
2003 (English)Conference paper, Published paper (Other academic)
Abstract [en]

Upgrading of existing railway lines for higher axle loads and speeds requires new modern methods for in situ investigation. Combination of measurements of track irregularities, continuous track stiffness and non-destructive geophysical methods like Ground Penetrating Radar (GPR) can be a good example of how important information about the status of existing railways can be obtained. GPR and Track Loading Vehicle (TLV) have been tested on the Swedish Western Main Line where subsoil of very soft clays under the track has caused a lot of problems. Results from investigations are going to be used for mitigation of excessive settlements, slides and especially environmental vibrations. Track stiffness was measured several times along the track with different excitation frequencies and travelling speed with Banverket’s Track Loading Vehicle. Track irregularities have been measured twice a year for several years. The GPR measurement was based on verified measurements that have been done for the Czech Railways. The GPR records were processed into the form of longitudinal sections to the depth of 3 m. Statistic methods have been applied for studies of relations between the parameters measured by the GPR and Track Loading Vehicle.

Keyword
Track-substructure investigation, ground penetrating radar, track loading vehicle, track stiffness
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-26357 (URN)
Conference
Maintenance & Renewal of Permanent Way; Power & Signalling; Structures & Earthworks, 30th April - 1st May 2003
Note

QC 20101123

Available from: 2010-11-23 Created: 2010-11-23 Last updated: 2012-08-23Bibliographically approved
4. Simulation, Development and Field Testing of a Track StiffnessMeasurement Vehicle
Open this publication in new window or tab >>Simulation, Development and Field Testing of a Track StiffnessMeasurement Vehicle
2005 (English)In: 8th Interntaional Heavy Haul Conference, Rio de Janeiro, 2005Conference paper, Published paper (Refereed)
Abstract [en]

A new vehicle for continuous measurement of vertical track stiffness has been built by Banverket. Two oscillatingmasses of the vehicle excite the track dynamically and the track stiffness is calculated from measured axle box forces andaccelerations. The stiffness is given as a complex quantity and presents both the magnitude and the phase. The repeatability isvery good, and some promising results for soft subsoils are shown. Both overall measurements at higher speeds (up to 60km/h) and detailed investigations (below 10 km/h) can be performed.

Keyword
Track stiffness, Simulation, Measurement, Track maintenance
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-10347 (URN)0-646-33463-8 (ISBN)
Conference
14th-16th of June 2005, Rio de Janeiro
Note
QC 20100623Available from: 2009-05-07 Created: 2009-05-07 Last updated: 2010-11-23Bibliographically approved
5. Identification of Substructure Properties of Railway Tracks by Dynamic Stiffness Measurements and Simulations
Open this publication in new window or tab >>Identification of Substructure Properties of Railway Tracks by Dynamic Stiffness Measurements and Simulations
2010 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 329, no 19, 3999-4016 p.Article in journal (Refereed) Published
Abstract [en]

A new vehicle has been developed to measure dynamic vertical track stiffness while in motion. This technique allows the resonance behaviour of the track below 50 Hz to be measured. Soft soils like clay and peat are the main causes of resonance below 20 Hz. By means of simulation studies with the software VibTrain, soft soil resonance behaviour may be characterized using a few key parameters originating from track stiffness measurements, such as the minimum phase delay and corresponding frequency of the receptance transfer function. Statistical models are built to relate these key parameters with substructure properties, such as embankment thickness, shear wave velocity and thickness of the soft soil layer using pattern recognition methods. Two case studies are used to show the methodology, and the results are verified using Ground Penetration Radar (GPR) measurements and borehole investigations. Models are also developed from the statistical relationship between GPR-data and stiffness measurements. It is shown that embankment thickness is the easiest quantity to estimate, but indicative results are also presented for the other quantities (shear wave velocity and thickness of soil layer).

 

Keyword
vibration, trains, speed
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-10350 (URN)10.1016/j.jsv.2010.04.015 (DOI)000279062200010 ()
Note
Uppdaterad från submitted till published(20101123) QC 20100623Available from: 2009-05-07 Created: 2009-05-07 Last updated: 2012-02-14Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Berggren, Eric
By organisation
Aeronautical and Vehicle Engineering
Vehicle Engineering

Search outside of DiVA

GoogleGoogle Scholar

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 2870 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