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Wheelset Curving Guidance Using H_infinity Control
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Rail Vehicles.
KTH, School of Electrical Engineering (EES), Automatic Control.ORCID iD: 0000-0003-1149-4715
(English)In: Vehicle System Dynamics, ISSN 0042-3114, E-ISSN 1744-5159Article in journal (Other academic) Submitted
Abstract [en]

This study shows how to design an active suspension system for guidance of a rail vehiclewheelset in curve. The main focus of the study is on designing the controller and afterwardsstudying its eect on the wheel wear behavior. The controller is designed based on theclosed-loop transfer function shaping method and H1 control strategy. The study discussesdesigning of the controller for both nominal and uncertain plants and considers both stabilityand performance. The designed controllers in Simulink are then applied to the vehicle modelin Simpack to study the wheel wear behavior in curve. The vehicle type selected for thisstudy is a two-axle rail vehicle. This is because this type of vehicle is known to have verypoor curving performance and high wheel wear. On the other hand, the relative simplerstructure of this type of vehicle compared to bogie vehicles make it a more economic choice.Hence, equipping this type of vehicle with the active wheelset steering is believed to show highenough benet to cost ratio to remain attractive to rail vehicle manufacturers and operators.

Keyword [en]
active suspension, actuated solid wheelset (ASW), shaping closed-loop transfer function, H1 control, two-axle rail vehicle, wear
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-208183OAI: oai:DiVA.org:kth-208183DiVA: diva2:1104749
Note

QC 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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