Ingo Kaiser

Ingo Kaiser
Nebrija Universidad · Escuela Politécnica Superior y Escuela de Arquitectura

About

43
Publications
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408
Citations

Publications

Publications (43)
Article
Full-text available
Rail vehicle lightweighting using fibre reinforced polymer composite materials is essential for the future of rail. This is recognised as a means of reducing carbon dioxide production through lower energy consumption, as well as reducing the impact on track degradation, thus delivering improved rail capacity and performance. This paper presents an...
Article
The wear occurring in the wheel-rail contact has a strong impact on the entire railway system consisting of the rolling stock and the infrastructure; essentially, the wear depends on the location of the contact area on the running surfaces and on the stresses acting in the contact area. Some combinations of wheel and rail profiles are known to be v...
Article
Railway running gear with variable gauge has been successfully introduced in vehicles for passenger traffic providing a drastic reduction of the time required for the gauge change. Therefore, using wheelsets with variable gauge even for freight wagons seems to be a very promising option for accelerating freight traffic. However, there are several c...
Article
The hunting motion of a passenger coach is investigated using a multibody system in which the wheelsets and the rails can be modelled as flexible bodies. By comparing the results for different model variants, in which the structural flexibilities of the wheelsets and of the rails are either taken into account or neglected, the impact of the flexibi...
Conference Paper
The formulation of the wheel-rail contact is a cru- cial issue in simulations considering the running dynamics of railway vehicles. Therefore a model- ing environment that is dedicated to railway ve- hicle dynamics such as the new DLR RaiwayDy- namics Library relies on an efficient representation of the kinematics and forces or torques, respec- tiv...
Article
Aktiv geregelte Losradfahrwerke, die eine optimale radiale Einstellung im Bogen ermöglichen, sind seit Längerem in der Diskussion. Von solchen Fahrwerken wird vor allem in engen Bögen eine erhebliche Minderung des Verschleißes an Rad und Schiene erwartet. Diese Idee wird im DLR Projekt „Next Generation Train“ (NGT) aufgegriffen und in das Konzept e...
Article
The stability assessment is an important task in the mechanical design of railway vehicles. For a detailed model of a railway passenger coach, the hunting behavior depending on the running speed, on wheel-rail contact conditions, and on different model configurations is analyzed using two different methods: The path-following method based on a dire...
Article
An enhanced model of a passenger coach running on a straight track is developed. This model includes wheelsets modelled as rotating flexible bodies, a track consisting of flexible rails supported on discrete sleepers and wheel–rail contact modules, which can describe non-elliptic contact patches based on a boundary element method (BEM). For the sce...
Conference Paper
An enhanced model of a passenger coach running on a straight track is developed. This model includes wheelsets modelled as rotating flexible bodies, a track consisting of flexible rails supported on discrete sleepers and wheel-rail contact modules, which can describe non-elliptic contact patches based on a boundary element method (BEM). For the sce...
Article
For a more detailed description of the effects related to vehicle-track interaction, which are relevant for the running behaviour, for noise and for wear, refined models of the wheelset, the track and the wheel-rail contact are developed. The models for the wheelset and for the track take the structural dynamics of the wheelset and the rails into a...
Conference Paper
For a more detailed description of the effects related to vehicle-track interaction, which are relevant for the running behaviour, for noise and for wear, refined models of the wheelset, the track and the wheel-rail contact are developed. The models for the wheelset and for the track take the structural dynamics of the wheelset and the rails into a...
Conference Paper
Multibody simulation plays an essential role in the initial design phase of railway vehicles in which conceptual issues are investigated. It is as well the state-of-the-art method in order to study and optimize the running dynamics and comfort of railway vehicles in details. However, acoustic issues could not be ad ressed so far by multibody analys...
Conference Paper
Full-text available
The bending deformation of rotating annular plates and the associated vibration behaviour is important in engineering applications which range from automotive or railway brake systems to discs that form essential components in turbomachinery. In order to extend the capabilities of the DLR FlexibleBodies library for such use cases, a new Modelica...
Conference Paper
The friction forces generated during braking between brake pads and discs produce high thermal gradients on the rubbing surfaces. These thermal gradients may cause braking problems such as brake fade, premature wear or hot spotting and the associated hot judder phenomenon in the frequency range below 100 Hz. Further consequences are comfort reduc...
Article
The two-axle intermediate waggons of DLR's Next Generation Train (NGT) have single-axle running gears with independently rotating wheels (IRW) and mechatronic track-guidance. This enables centring in the track and active radial steering for IRW pairs during curve passing. The wheel wear and noise generation can thus be considerably reduced. Multibo...
Conference Paper
Es wird ein computergestütztes Modell zur Simulation der Fahrzeug-Fahrweg-Wechselwirkung von Schienenfahrzeugen entwickelt. Gegenüber standardmäßig verwendeten Modellierung von Schienenfahrzeugen besitzt das vorgestellte Modell folgende Erweiterungen: 1. Die Radsätze werden als rotierende flexible Körper modelliert. 2. Das Gleis besteht aus zwei Sc...
Conference Paper
The distribution of the stresses in the rolling contact of a railway vehicle can be very sensitive to changes of the relative kinematics. Such changes can be caused by displacements of the wheelset in the track, but also by structural deformations of the wheelsets and the rails. A detailed knowledge of the stress distribution in the wheelrail conta...
Conference Paper
Die Mehrkörpersimulation ermöglicht heutzutage die Berechnung der hochfrequenten Schwingungen elastischer Strukturen mit akzeptablem Rechenaufwand. In diesem Kontext bietet sich an, die Ergebnisse von Zeitsimulationen komplexer Mehrkörpersysteme auch akustisch auszuwerten. Hierbei bietet sich insbesondere die Betrachtung des Körperschalls an, da si...
Conference Paper
In this paper, some of the topics studied at the Institute of Robotics and Mechatronics of the German Aerospace Center (DLR) with respect to the multibody simulation of railway vehicles are briefly presented and discussed. They are all based on high level of multidisciplinarity in terms of itegration between different physical fields and, consequen...
Conference Paper
In diesem Beitrag wird die Berechnung des Körperschalls für beliebige Maschinenelemente im Rahmen der Mehrkörpersimulation diskutiert. Der übliche modale Ansatz für die Simulation flexibler Körper bietet die Basis für die akustische Analyse, so dass die Vorteile der etablierten Prozesskette FEM – MKS unberührt bleiben. Die Körperschallberechnung, d...
Conference Paper
This paper gives an overview of a part of the research work on railway vehicle system simulations done by the Institute of Robotics and Mechatronics at the German Aerospace Center (DLR) over the last years. The results of this work form a range of tools and methods which qualitatively increase the spectrum of phenomena that can be studied by simula...
Conference Paper
A method based on the half-space assumption is developed to calculate the stress distribution in the wheel-rail contact. For the calculation, the stress distributions are discretised using a grid and local functions. Although the method is not an estimation, but a numerical solution of the equations of the contact, it is fast enough for multi-body...
Conference Paper
A new method for the description of rotating elastic structures is derived which is especially well suited for the description of coupled rotor-stator systems. The main idea is to eliminate the angle of the large rotational motion from the equations without neglecting the rotational velocity and the gyroscopic effects caused by it. This is done by...
Conference Paper
Today, the simulation of the running behaviour of railway vehicles is usually carried out on the base of a multi-body system approach and under the assumption that the wheelsets and the rails are rigid bodies. Considering the strongly nonlinear characteristics of the wheel-rail contact which can be very sensitive even to small relative shifts, the...
Conference Paper
This contribution deals with the identification of the running-state of railway wheelsets by means of accelerations measured at the axle-boxes. The interaction between rail and wheel causes rigid-body motions as well as structural vibrations. First of all accelerations are decomposed into their symmetric and antimetric components, followed by a tim...
Article
Es wird ein Simulationsmodell eines Reisezugwaggons vorgestellt, in dem die Radsätze und die Schienen als elastische Körper beschrieben werden. Bisher wird die Elastizität der Radsätze und der Schienen für die Untersuchung des Laufverhaltnes von Schienenfahrzeugen nur selten berücksichtigt. Anhand von Ergebnissen, die mit diesem Modell errechnet wu...
Conference Paper
The wheelset is the central element of a railway vehicle, responsible for support and guidance. For simulations of the low-frequent behaviour, the wheelsets are usually considered as rigid bodies. However, the wheel-rail contact is a strong nonlinear element which can be very sensitive even to small relative motions of wheel and rail. Therefore, th...
Conference Paper
Computational techniques allow a very efficient and inexpensive analysis of the running behaviour of railway vehicles. In this paper enhancements related to multibody simulation for three fundamental topics are briefly presented: A software environment for the bifurcation analysis of complex simulation models of arbitrary railway vehicles; consider...
Chapter
The interaction of railway vehicles and track in the mid-frequency range is not fully understood yet. However, this range is important for wear problems, therefore more knowledge is required. Since the conventional modelling of the vehicle-track system is not sufficient, this paper presents some methods of modelling, which consider the elasticity o...
Conference Paper
The straight running behaviour of a passenger couch is investigated for the cases of the wheelsets considered as elastic and a rigid bodies. The model used for this investigation includes rotating elastic wheelsets modelled in an efficient way for the computation and a nonlinear wheel-rail contact. The behaviour below and beyond the critical speed...
Chapter
Some effects occurring at modern high speed railway vehicles like grumbling noise and polygonalization of the wheels are located in the mid-frequency range between 50 Hz and 500 Hz. Since multi-body systems consisting of rigid bodies are not sufficient for this frequency range, a description of the rotating elastic wheelsets is developed in this pa...
Article
During the last years railway companies have observed increasing problems with track damage like rail corrugation, deterioration of ballast or unround wheels. Since the origin of these damages is suspected in the mid-frequency dynamics, research activities in the frequency range from 50 up to 500 Hz have been initiated. The article demonstrates tha...

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