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
Active Lateral Secondary Suspension in a High-Speed Train to Improve Ride Comfort
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Active secondary suspension in trains has been studied for a number of years, showing promising improvements in ride comfort. However, due to relatively high implementation and maintenance costs, active technology is not being used in service operation to a large extent. The objective of this study is to develop an active lateral secondary suspension concept that offers good ride comfort improvements and enables centring of the carbody above the bogies when negotiating curves at unbalanced speed. Simultaneously, the active suspension concept should be a cost-effective solution for future series production. The thesis consists of an introductory part and three appended papers.

The introductory part describes the concept of active secondary suspension together with different actuator types and control methods. Further, the present simulation model and applied comfort evaluation methods are presented. The introductory part also comprises a summary of the appended papers, an evaluation of track forces and suggestions for further work.

Paper A presents the initial development of an active lateral secondary suspension concept based on sky-hook damping in order to improve vehicle dynamic performance, particularly on straight tracks. Furthermore, a Hold-Off-Device (HOD) function has been included in the suspension concept in order to centre the carbody above the bogies in curves and hence avoid bumpstop contact. Preparatory simulations as well as the subsequent on-track tests in the summer of 2007 showed that the active suspension provides improved passenger ride comfort and has significant potential to be a cost-effective solution for future implementation.

In Paper B, measurement results from on-track tests performed in 2008 are presented. The active secondary suspension concept was slightly modified compared to the one presented in the first paper. One modification was the implementation of a gyroscope in order to enable detection of transition curves and to switch off the dynamic damping in these sections. Ride comfort in the actively suspended carbody was significantly improved compared to that in the passively suspended car. The satisfactory results led to implementation of the active suspension system in long-term tests in service operation in the beginning of 2009.

In Paper C, a quarter-car model in MATLAB has been used to investigate a more advanced control algorithm: H instead of sky-hook. H control provides more flexibility in the design process due to the possibility to control several parameters. In particular, this is done by applying weight functions to selected signals in the system. When comparing the two control strategies through simulations, the results show that H control generates similar carbody accelerations at the same control force as sky-hook; however, the relative displacement displacement is somewhat lower.

Place, publisher, year, edition, pages
Stockholm: KTH , 2009. , x, 42 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2009:22
Keyword [en]
railway, active suspension, ride comfort, sky-hook, Hinf, multi-body simulations, on-track tests
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-10432ISBN: 978-91-7415-300-2 (print)OAI: oai:DiVA.org:kth-10432DiVA: diva2:217232
Presentation
2009-06-03, S40, Teknikringen 8, KTH, Stockholm, 10:00 (Swedish)
Opponent
Supervisors
Available from: 2009-05-14 Created: 2009-05-13 Last updated: 2010-10-27Bibliographically approved
List of papers
1. On-track tests with active lateral secondary suspension: a measure to improve ride comfort
Open this publication in new window or tab >>On-track tests with active lateral secondary suspension: a measure to improve ride comfort
2008 (English)In: ZEV Rail Glasers Annalen, ISSN 1618-8330, Vol. 132, no 11-12, 469-477 p.Article in journal (Refereed) Published
Abstract [en]

At increased rail vehicle speed it may be difficult to maintain acceptable passenger ride comfort with conventional passive secondary suspension. This paper presents the development of an active secondary suspension that provides good ride comfort improvements, but still at an acceptable cost level to enable future implementation. On-track tests have been performed with a two-car Regina train, using electro-hydraulic actuators together with sky-hook damping control and a Hold-Off-Device function to actively control the secondary suspension. The evaluated measurement results show that the active suspension system significantly reduces the lateral dynamic carbody motions and the lateral quasi-static displacements between carbody and bogies in curves, which improves the ride comfort and allows higher speeds, particularly in curves.

Keyword
Suspensions (components), Vehicle suspensions
National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Gröna tåget
Identifiers
urn:nbn:se:kth:diva-10442 (URN)2-s2.0-58049159501 (Scopus ID)
Note
QC 20101027Available from: 2009-05-14 Created: 2009-05-14 Last updated: 2011-12-05Bibliographically approved
2. Ride comfort improvements in a high-speed train with active secondary suspension
Open this publication in new window or tab >>Ride comfort improvements in a high-speed train with active secondary suspension
2010 (English)In: Journal of Mechanical Systems for Transportation and Logistics, ISSN 1882-1782, Vol. 3, no 1, 206-215 p.Article in journal (Refereed) Published
Abstract [en]

A combination of increased vehicle speeds and non-improved railway tracks may have a negative impact on passenger comfort. Active technology can replace the conventional passive solution of the secondary suspension of a rail vehicle in order to maintain good passenger comfort even when vehicle speed is increased and track conditions are inferior. This paper focuses on the benefits of using a so-called Hold-Off-Device (HOD) function in the lateral secondary suspension. On-track tests have been performed with the active secondary suspension concept implemented in a two-car Regina train during the summers of 2007 and 2008. The evaluated measurement results have been very satisfactory and the device will be implemented in long-term tests in service operation. These tests were carried out in the beginning of 2009.

Keyword
Active Suspension, Hold-Off-Device, Ride Comfort, On-Track Tests
National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Gröna tåget
Identifiers
urn:nbn:se:kth:diva-10443 (URN)10.1299/jmtl.3.206 (DOI)
Note
QC 20101027Available from: 2009-05-14 Created: 2009-05-14 Last updated: 2011-12-05Bibliographically approved
3. Development and test of active secondary suspension in a rail vehicle
Open this publication in new window or tab >>Development and test of active secondary suspension in a rail vehicle
2009 (English)In: Proceedings of the 21st International Symposium: Dynamics of Vehicles on Roads and Tracks, 2009Conference paper, Published paper (Other academic)
Abstract [en]

This paper deals with a quarter-car rail vehicle model using active lateral secondary suspension. H control theory is applied to the active suspension with the purpose of improving the dynamic performance of the vehicle. In H control, weight functions are applied to certain signals in order to design the controller. Different combinations of signal weighting have been evaluated through simulations. The main goal is to minimise the carbody acceleration and hence improve ride comfort. Furthermore, the H control theory is compared to sky-hook damping, which has been used in previous studies by the authors. Simulation results show that both control methods significantly improve the ride comfort as compared to a passive case. Compared to sky-hook damping, H control provides more flexibility in the design process due to the possibility to control several parameters. Furthermore, H control generates similar carbody accelerations at the same control force as sky-hook damping; however, the relative displacement is somewhat lower with H control.

National Category
Vehicle Engineering
Research subject
Järnvägsgruppen - Gröna tåget
Identifiers
urn:nbn:se:kth:diva-10444 (URN)
Conference
21st International Symposium on Dynamics of Vehicles on Roads and Tracks. Stockholm, Sweden, 17-21 August 2009
Note
QC 20101027Available from: 2009-05-14 Created: 2009-05-14 Last updated: 2011-12-05Bibliographically approved

Open Access in DiVA

fulltext(1934 kB)2053 downloads
File information
File name FULLTEXT03.pdfFile size 1934 kBChecksum SHA-512
fe5dbbdc624d31f2d836c00336f628e90997fd4f1ca02088c824c3d2e8058bf6b45ceae859eb276ad79d808c514b3274f22d18c3b0a8523124fa9fcce4b4d8fc
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Orvnäs, Anneli
By organisation
Aeronautical and Vehicle Engineering
Vehicle Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 2054 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 981 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