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Model based observer synthesis for the longitudinal dynamics estimation of a wheelset

Schwarz, Christoph and Brembeck, Jonathan and Heckmann, Benjamin (2018) Model based observer synthesis for the longitudinal dynamics estimation of a wheelset. Fourth International Conference on Railway Technology: Research, Development and Maintenance, 03.-07. Sept. 2018, Sitges, Spanien.

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Abstract

The presented work illustrates a model based observer synthesis for the longitudinal dynamics estimation of a wheelset. This approach eases the trade-off between safety, comfort and wear that most research activities dealing with railway technology have to face. The developed observers are tested and validated at a test rig. The observer design process covers the three main steps: implementation of the observer dynamics, definition of the measurement signals, and specification of the observer cor-rection term via a multi-case optimization. The nonlinear analytical observer model is implemented using the Lagrange formalism and it takes the major nonlinearity of the wheel-rail interface into account. Furthermore, the rotational velocities of the wheelset and the roller are assumed to be outputs. The pneumatic pressure of the brake units and the torque of the roller drive are defined as inputs. Regarding the longitudinal railway dynamics the variation of the friction conditions in the wheel-rail interface and in the interface between brake pads and brake disc highly influence safety, comfort, and wear. Therefore, a parameter estimator and a disturbance observer are implemented, since these methods allow for a specific consideration of the varying friction conditions. The observer parameters are optimized using a multi-case optimization algorithm with measurement data sets. The received results proof that the observers accurately estimate the system states and provide reliable information regarding the longi-tudinal dynamics. Exploiting this information facilitates some promising applications to improve safety, comfort and wear all at once, e.g. advanced algorithms for the wheel slide and skid protection systems. Tasks to be tackled in the future are to adapt the observers to an entire train system and to validate them with data from track tests.

Item URL in elib:https://elib.dlr.de/122042/
Document Type:Conference or Workshop Item (Speech)
Title:Model based observer synthesis for the longitudinal dynamics estimation of a wheelset
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schwarz, ChristophChristoph.Schwarz (at) dlr.dehttps://orcid.org/0000-0003-4882-0828
Brembeck, Jonathanjonathan.brembeck (at) dlr.deUNSPECIFIED
Heckmann, BenjaminKnorr-Bremse Systeme für Schienenfahrzeuge GmbHUNSPECIFIED
Date:September 2018
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:longitudinal dynamics, observer synthesis
Event Title:Fourth International Conference on Railway Technology: Research, Development and Maintenance
Event Location:Sitges, Spanien
Event Type:international Conference
Event Dates:03.-07. Sept. 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of System Dynamics and Control > Vehicle System Dynamics
Deposited By: Schwarz, Christoph
Deposited On:11 Oct 2018 11:39
Last Modified:31 Jul 2019 20:19

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