On active suspension in rail vehicles

The topic of this PhD thesis is active suspension in rail vehicles which is usually realized through sensors, controllers and actuation components. A well established example of an active suspension is the tilting control system used to tilt the car body in curves to reduce centrifugal acceleration felt by passengers. Active suspension for rail vehicles is being studied since 1970s and in this PhD thesis it has been tried to expand on some aspects of this topic. This study extends the research field by both experimental and theoretical studies. In the first phase of the study which led to a licentiate degree the focus was more on experimental work with active vertical suspension (AVS). This was implemented by introducing actuators in the secondary suspension of a Bombardier test train, Regina 250, in the vertical direction. The aim has been to improve vertical ride comfort by controlling bounce, pitch and roll motions. In the second phase after the licentiate, the studies have been more theoretical and can be divided into two parts. The first part of the work has been more focused on equipping two-axle rail vehicles with different active suspension solutions for improving the vehicle performance regarding comfort and wheel-rail interaction. Three papers are written on active suspension for two-axle rail vehicles. Two of the papers discuss the use of H¥ control for wheelset guidance in curves to reduce wheel-rail damage. The third paper shows that by use of active vertical and lateral suspension (AVS and ALS) in two-axle rail vehicles good comfort can be achieved as well. The paper then studies how the three active suspension systems (ALS, AVS, and ASW) interact once implemented together on a two-axle rail vehicle. The second part is a study on safety of active suspension systems. The study discusses a possible procedure to ensure that a designed active suspension for a rail vehicle will be safe in all possible failure situations.


  • English

Media Info

  • Pagination: 118
  • Serial:
    • Issue Number: 2017:32
    • Publisher: KTH Royal Institute of Technology, Sweden
    • ISSN: 1651-7660

Subject/Index Terms

Filing Info

  • Accession Number: 01716707
  • Record Type: Publication
  • Source Agency: Swedish National Road and Transport Research Institute (VTI)
  • ISBN: 9789177294085
  • Files: ITRD, VTI
  • Created Date: Sep 17 2019 10:32AM