Different Models of a Scaled Experimental Running Gear for the DLR RailwayDynamics Library

Schwarz, Christoph; Heckmann, Andreas; Keck, Alexander

doi:10.3384/ecp15118441

Cited by 12 publications

(11 citation statements)

References 10 publications

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“…The calculation of the terms in equation 4is based on the procedure illustrated in Schwarz et al 13 In the end, the specification of the system dynamics f o ðx o , uÞ as well as the definition of the output vector y is the basis for the observer synthesis.…”

Section: Simulation Models Of the Systemmentioning

confidence: 99%

“…o , the generalized forces and torques Q Q Q o , and the generalized coordinates q q q o with their time derivativesq q q m= [ω W ; ω R ] andq q q f = [ż F ;β B ; ω W ; ω R ].The calculation of the terms in (4) is based on the procedure illustrated in Schwarz13 . In the end, the specification of the system dynamics f f f o (x x x o , u u u) as well as the definition of the output vector y y y are the basis for the observer synthesis.…”

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confidence: 99%

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Dynamics observer for the longitudinal behavior of a wheelset on a roller rig

Schwarz

Brembeck

Heckmann

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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The presented work illustrates the synthesis of a nonlinear model-based observer for the longitudinal dynamics estimation of a wheelset. This approach offers some significant improvements, such as an enhanced adherence to prescribed brake distances and an advanced usability of the condition-based maintenance of brake systems. The investigation of a single wheelset in a test rig environment enables, for example, the usage of an extended set of sensors to reliably validate the observers. The presented observer design process covers three main steps: identification of the characteristic system disturbances, implementation of the nonlinear observer dynamics, and parametrization of the observer via multicase optimization. With regard to the longitudinal dynamics, the variations of the friction conditions in the wheel–rail interface and in the interface between brake pads and brake disc have a crucial influence. Therefore, a parameter estimator and a disturbance observer are implemented, since these methods allow for a specific consideration of these disturbances. The obtained results prove that the observers accurately estimate the system behavior and provide reliable information on the longitudinal dynamics.

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Section: Simulation Models Of the Systemmentioning

confidence: 99%

mentioning

confidence: 99%

Dynamics observer for the longitudinal behavior of a wheelset on a roller rig

Schwarz

Brembeck

Heckmann

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

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“…These signals are provided by the MBS-Software SIMPACK during the simulation, but y and w are difficult to measure in practical use. Possible measurement methods are discussed in related articles 10,15 and are a current research topic. The outputs of the control are the torques: the same absolute values but with an alternating sign are applied to the left and the right wheels.…”

Section: Control Schemementioning

confidence: 99%

Robust active guidance control using the µ-synthesis method for a tramcar with independently rotating wheelsets

Yang

Huang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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This paper presents a robust active guidance controller that uses the µ-synthesis method to improve the ability of guidance and to reduce the wheel–rail wear under the consideration of system nonlinearity, parameter uncertainty, and measurement noise in tramcars with independently rotating wheelsets (IRWs). Each wheel of the tramcar is connected to a sider motor, and the active yaw moment is generated by the torque differences between the left and right wheels in the same axle. To achieve local control, the wheel–rail force and the primary suspension force are considered as external disturbances, and the IRW state–space model is modeled independent of the tramcar system. The effectiveness of the controller is mainly verified by the cosimulation method: the dynamic model of the tramcar is established in SIMPACK, and the controller model is established in MATLAB. The simulation results show that compared with the passive case, for the actual tramcar, the control method can improve the vehicle's running performance and can significantly reduce the wheel–rail wear in both straight and curved tracks. A 1:5 scaled tramcar model is used for the active guidance experiment to further verify the effectiveness of the algorithm.

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“…With this background, a subpackage of the DLR RailwayDynamics Library (Heckmann et al, 2014a), (Schwarz et al, 2015) has been implemented in Modelica which aims at the assessment of railway vehicles with respect to crosswind stability. To a large extent, the tool is oriented towards (EN 14067-6: 2010) and the simulation procedures defined there including a non-normative but promising stochastic approach in Appendix J.…”

Section: Motivationmentioning

confidence: 99%

The DLR RailwayDynamics Library: the Crosswind Stability Problem

Heckmann

Grether

2017

Linköping Electronic Conference Proceedings

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High crosswinds affect the stability of railway vehicles, in particular if they run on very high speed to reduce traveling time, if they are configured as double-deck cars to increase the number of passenger seats and if they use lightweight design in order to reduce life-cycle costs. This is why crosswind stability is an active field of research within the project Next Generation Train. However, this field relies on the cooperation of two different domains, namely aerodynamics and vehicle dynamics. With this background a crosswind stability tool was implemented in Modelica as a part of the DLR RailwayDynamics Library. This tool gathers data from scaled wind tunnel measurements and multibody data on the railway vehicle in order to rapidly analyze and assess the risk of overturning due to high crosswinds. To a large extent the tool is oriented towards the associated homologation rules and standards. However, the tool is as well supposed to support future advancements of these standards by providing capabilities for the stochastic analysis of the crosswind stability problem.

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Different Models of a Scaled Experimental Running Gear for the DLR RailwayDynamics Library

Cited by 12 publications

References 10 publications

Dynamics observer for the longitudinal behavior of a wheelset on a roller rig

Dynamics observer for the longitudinal behavior of a wheelset on a roller rig

Robust active guidance control using the µ-synthesis method for a tramcar with independently rotating wheelsets

The DLR RailwayDynamics Library: the Crosswind Stability Problem

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