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Active Lateral and Active Wheelset Steering Interference
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
2017 (English)In: / [ed] Wanming Zhai, China, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Two-axle rail vehicles with only one level of suspension started operation in light traffic in the early 1930s. These vehicles were known to be cheap, light, and easy to maintain which made them suitable for parsley populated regional traffic. However, their limitations prevailed over their advantages which finally led to the extinction of these vehicles. These limitations were poor wheel-rail interaction, low capacity, and low comfort. Poor wheel-rail interaction which led to high wear and squeal noise on curves and low hunting speed on straight track was one of the major drawbacks. KTH rail vehicle division suggests reviving the old two-axle rail vehicle and improving its performance by introducing active suspension systems. Studies so far include improving ride comfort by active lateral and vertical suspension and active wheelset steering to improve curving and reduce wear. However, wheelset steering is not yet implemented together with active lateral and vertical suspension. Implementing them together can cause that the systems interfere in each other’s objectives. Hence it is necessary to study the interaction between the three systems. Results show that introducing active wheelset steering has a negative effect on the lateral comfort while active lateral suspension does not show significant effect on the wear performance of active wheelset steering. The study concludes that a vehicle with all the three active suspension systems included can improve all the three intended performances (lateral-vertical comfort and wheel wear) compared to the passive vehicle.

Place, publisher, year, edition, pages
China, 2017.
Keyword [en]
active suspension; active lateral suspension (ALS); active vertical suspension (AVS); actuated solid wheelset (ASW); comfort; wear
National Category
Mechanical Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-208182OAI: oai:DiVA.org:kth-208182DiVA: diva2:1104747
Conference
International Conference on Rail Transportation
Note

QCR 20170602

Available from: 2017-06-01 Created: 2017-06-01 Last updated: 2017-06-02Bibliographically approved
In thesis
1. On Active Suspension in Rail Vehicles
Open this publication in new window or tab >>On Active Suspension in Rail Vehicles
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The topic of this PhD thesis is active suspension in rail vehicles whichis usually realized through sensors, controllers and actuation components.A well established example of an active suspension is the tiltingcontrol system used to tilt the carbody in curves to reduce centrifugalacceleration felt by passengers. Active suspension for rail vehicles is beingstudied since 1970s and in this PhD thesis it has been tried to expandon some aspects of this topic.This study extends the research field by both experimental and theoreticalstudies. In the first phase of the study which led to a licentiatedegree the focus was more on experimental work with active verticalsuspension (AVS). This was implemented by introducing actuators inthe secondary suspension of a Bombardier test train, Regina 250, in thevertical direction. The aim has been to improve vertical ride comfort bycontrolling bounce, pitch and roll motions.In the second phase after the licentiate, the studies have been moretheoretical and can be divided into two parts. The first part of the workhas been more focused on equipping two-axle rail vehicles with differentactive suspension solutions for improving the vehicle performanceregarding comfort and wheel-rail interaction. Three papers are writtenon active suspension for two-axle rail vehicles. Two of the papers discussthe use of H¥ control for wheelset guidance in curves to reducewheel-rail damage. The third paper shows that by use of active verticaland lateral suspension (AVS and ALS) in two-axle rail vehicles goodcomfort can be achieved as well. The paper then studies how the threeactive suspension systems (ALS, AVS, and ASW) interact once implementedtogether 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 activesuspension for a rail vehicle will be safe in all possible failure situations.

Place, publisher, year, edition, pages
Stockholm, Sweden: KTH Royal Institute of Technology, 2017. 100 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2017:32
Keyword
active suspension, ride comfort, wear, skyhook control, H_infinity control, two-axle rail vehicle, safety
National Category
Vehicle Engineering
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-208184 (URN)978-91-7729-408-5 (ISBN)
Public defence
2017-05-31, F3, Lindstedtsvägen 26, KTH Royal Institute of Technology, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170602

Available from: 2017-06-02 Created: 2017-06-01 Last updated: 2017-06-02Bibliographically approved

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