Fabian Duvigneau

Otto-von-Guericke-Universität Magdeburg | OvGU · Institute of Mechanics

Die Autoren haben in vorangegangen Studien verschiedene Konzepte zur passiven Schwingungsdämpfung vorgestellt, die im Wesentlichen die hohe innere Reibung granularer Medien als Dissipationsquelle nutzen. In diesem Beitrag soll nun das granulare Material im Fokus stehen, das für die Partikeldämpfer genutzt wird. Im Rahmen experimenteller Studien wer...

Die Autoren haben in vorangegangen Studien verschiedene Konzepte zur passiven Schwingungsdämpfung vorgestellt, die im Wesentlichen die hohe innere Reibung granularer Medien als Dissipationsquelle nutzen. In diesem Beitrag soll nun das granulare Material im Fokus stehen, das für die Partikeldämpfer genutzt wird. Im Rahmen experimenteller Studien wer...

In diesem Beitrag stehen die granularen Materialien im Fokus, die für Partikeldämpfer genutzt werden. Im Rahmen experimenteller Studien wurden über 18 Materialien untersucht und vergleichend bewertet. Darüber hinaus wurden auch Mischungen näher betrachtet. Die Palette der untersuchten Materialien reicht von Sand-über Gummi-bis hin zu metallischen W...

In material modeling, when dealing with diffusion at large deformations, there are usually two different variants for the diffusion flux: an isotropic law in the current placement and an isotropic law in the reference placement. The first one causes diffusion behavior, which is independent from the initial shape of the body, i.e., it causes a defor...

To get a better insight into the coating behavior of a polymer-derived ceramic material, we model and simulate the diffusion, oxidation and reaction-induced volume expansion of a specimen without outer mechanical loads. In this macroscale approach, we use an oxidation state variable which determines the composition of the starting material and the...

Die Antriebskonzepte werden sich im Rahmen der Mobilitätswende wandeln und vielseitiger werden. Dennoch sind viele der Methoden, die für die fossilen Verbrennungsmotoren entwickelt wurden, auf die neuen Antriebskonzepte übertragbar. Dies wird im Beitrag insbesondere bezüglich der wasserstoffbetriebenen Verbrennungsmotoren dargelegt. Es wird eine Vo...

The purpose of this paper is to introduce a honeycomb damping plate (HCDP) concept based on the particle damping technique to reduce the low-frequency vibration response of wind turbine generators. The HCDP cells contain granular materials and are mounted at different positions on the generator to reduce the transmission of vibrations from the stat...

In this paper, a method for vibration analysis of electric engines and associated structure is presented. For this purpose, a multi-body simulation (MBS) is extended in such a way that electromagnetic loads can be considered using the finite element method (FEM). Subsequently, the determined loads lead to an excitation of the structural vibrations...

A semi-analytical solution of the Reynolds equation for hydrodynamic bearings in rotordynamic simulations is investigated, which is based on the Scaled Boundary Finite Element Method (SBFEM). The numerical efficiency of this approach is compared to the Finite Element Method (FEM), considering linear as well as higher-order shape functions. It is ob...

Sound emission from an onshore wind turbine is one of the significant hurdles for the expansion of wind energy farms. The vibration caused by the generator is transmitted to the blades, which radiates the sound to the surrounding. The purpose of this poster is to introduce three different implementation strategies of particle dampers to reduce the...

Due to the fact that noise emission and pollution of automobiles are of current interest, electromobility becomes more and more important to tackle the arising problems. Consequently, also issues due to vibrational and acoustical behaviour of electric engines and whole electric drive trains are increasingly in the focus of automotive developers, as...

Within a multi-body simulation (MBS) a three-dimensional FE model is employed to represent the nonlinear properties of rubber bushings. This is implemented via a sequential force-displacement coupling between the two solvers. For a first material modeling approach of the elastomer, the modified Neo Hooke model is used in conjunction with the genera...

Die Schallemissionen einer Windkraftanlage stellen eines der Haupthindernisse für den weiteren Ausbau von Onshore-Windenergieanlagen dar. Eine mögliche Ursache der Schallemissionen sind Vibrationen, die sich als Resultat der Energiewandlung über die Trägerstruktur in die gesamte Windenergieanlage ausbreiten und schließlich als Schall abgestrahlt we...

Sound emission from an onshore wind turbine is one of the significant hurdles to use wind energy to its full potential. The vibration caused by the generator and gearbox is transmitted to the blades, which radiates the sound to the surrounding. The purpose of this experimental study is to present a passive vibration reduction concept, which is base...

The behavior of rotor systems with hydrodynamic bearings can be affected crucially by the nonlinear bearing forces. These forces are incorporated in rotordynamic simulations by solving the Reynolds equation in every step of a time integration scheme. Since closed-form analytical solutions of the Reynolds equation are known only for simplified bound...

Polygonal finite elements offer an increased freedom in terms of mesh generation at the price of more complex, often rational, shape functions. Thus, the numerical integration of rational interpolants over polygonal domains is one of the challenges that needs to be solved. If, additionally, strong discontinuities are present in the integrand, e.g.,...

In this paper, a method is presented to determine the vibrational behavior of an electric motor and the associated structure. Therefore, a holistic simulation approach is used, which takes into account the mutual influence of structural mechanics and electrodynamics. For this purpose, a multi body simulation (MBS) is extended so that electromagneti...

In this contribution a novel integration scheme, extending the conventional quadtree‐decomposition‐based approach by image compression techniques, is investigated for unfitted polygonal meshes with a particular focus on the rational Wachspress shape functions. It is shown that a meaningful reduction of integration points can be achieved without a s...

A numerically efficient, semi-analytical solution of the Reynolds equation for hydrodynamic journal bearings is developed based on the Scaled Boundary Finite Element Method. The pressure field is discretized along the circumferential coordinate of the lubrication gap, while an analytical formulation is used in the axial direction. A system of inhom...

The proper modeling of noise control treatments is a key factor for the robustness of the numerical prediction of the sound transmission. Typical acoustic treatments applied in the industry include one or more layers of poroelastic materials. These are particularly challenging to model since they exhibit a complex, high dissipative behavior that is...

In order to improve the acoustic behavior of an electric drive train a holistic simulation approach is presented that considers the interactions of structural mechanics and elec-trodynamics. The electrodynamic forces in the motor influence both the rotor dynamics and the structure vibration and thus the sound radiation. Even small variations of the...

In the present work, we propose a new approach, the so-called compressed adaptiveintegration scheme (C-AIS), for the computation of the stiffness and mass matrices infictitious domain methods requiring the integration of discontinuous functions. Thenovel approach extends the conventional quadtree-decomposition-based adaptiveintegration scheme (AIS)...

An amendment to this paper has been published and can be accessed via the original article.

The purpose of this study is to present different designs for the wind turbine blade and generator test specimens for evaluating a passive vibration reduction concept, which is based on the high damping properties of granular materials. For the experimental purpose in the laboratory, small-scaled replica inspired by the original configuration are u...

In early design phases of ball typed constant velocity joints (CVJ), which are widely used for the uniform transmission of rotational movement in driveshafts, the knowledge of the interactions between the components is essential. Therefore, a simulation model for a multi-body analysis is developed to consider general, transient operating conditions...

The presented study deals with the experimental characterization of damping materials for acoustic simulations with respect to the stiffness and damping in dependence of the excitation frequency, i.e. frequency-dependent elasticity modulus. The test rigs under consideration utilize a shaker, acceleration sensors and a laser Doppler vibrometer (LDV)...

Acoustics represents a quality feature of a passenger vehicle. During the first development phases, prediction tools of the acoustic performance are required to assess in the design process. A combination of numerical and experimental data provides a good compromise between accuracy and modeling effort. A key part of the airborne noise transmission...

The acoustic behavior of structures has lately been in the focus of industrial applications, due to the fact that the acoustic emission of a product is one major parameter which significantly influences the customer perception with respect to comfort and functionality. In this context, the numerical simulation of vibroacoustic problems needs to pro...

Kurzfassung Für die Modellierung von akustischen Dämm-und Dämpfungsmaterialien sind die zugrundeliegenden Materialparameter von immenser Bedeutung. Im Allgemeinen kann die frequenzabhängige Steifigkeit und Dämpfung eines viskoelastischen Materials mit Hilfe eines frequenzabhängigen komplexen Elastizitätsmoduls beschrieben werden. Um diesen experime...

Der Grundgendanke von fiktiven Gebietsmethoden, wie der Finiten Zellen Methode (FCM), liegt in der Einbettung des physikalischen Gebietes in ein erweitertes Gebiet einfacher Form, sodass eine effiziente Diskretisierung mittels kartesischer Gitter erfolgen kann. Dadurch wird nicht nur der Diskretisierungsprozess selbst, im Vergleich zur herkömmliche...

Kurzfassung In den letzten Jahren hat die Elektromobilität deutlich an Bedeutung gewonnen und gilt schon jetzt als ein bedeutendes Antriebskonzept der Zukunft. Für die Entwicklung neuer bzw. die Weiterentwicklung vorhandener Maschinen und Konzepte kommen Simulationsmethoden zum Einsatz, die es erlauben das Verhalten ohne die Verwendung kostenintens...

In this contribution different high-order finite element methods (FEMs), such as the spectral element method (SEM) or the p-version of the FEM, are applied to problems in interior acoustics. The aim is to compare the different methods with respect to their and computational effort. The commercial finite element software Abaqus serves as a reference...

Die zuverlässige Voraussage des akustischen Verhaltens komplexer Systeme ist für die moderne Industrie von sehr großem Interesse, stellt jedoch eine ebenso große Herausforderung dar. Ziel ist eine belastbare Prognose, die bereits früh im Entwicklungsprozess zur Verfügung steht (ohne die Verfügbarkeit und Notwendigkeit von Prototypen). Dazu können d...

In the context of environmentally friendliness and challenging pollution limits the electrification of passenger cars becomes more and more important. In this contribution an innovative electrical drive for automobiles is presented and its vibration behavior is analyzed experimentally. In special, the vibrations of an electric wheel hub motor are s...

The publication can be downloaded from the springer page (see DOI) for free!

The publication can be downloaded from the springer page (see DOI) for free!

In this paper an experimental method for determining the frequency‐dependent stiffness and damping properties is presented. The aim is to obtain valid input parameters for a simulation model that considers the most important effects of typical damping materials without the necessity of poroelastic material formulations, which require at least five...

The paper examines the possibility to predict the noise absorption behavior of poroelastic materials with a simple modeling approach trying to avoid the extensive experimental efforts of advanced modeling strategies based upon the Biot theory of poroelastic media. The concept is to experimentally determine the frequency-dependent stiffness and damp...

The introduction of stricter exhaust emission standards for passenger cars intensifies the trends towards more efficient vehicles. This can be achieved, for example, by using smaller engines, increasing the combustion pressure, or reducing the total weight of the vehicle. Furthermore, comfort expectations of the customers increase, whereas regulati...

In this paper, the acoustic behavior of an electric wheel hub motor, which uses a combination of a classical slot winding and an innovative air gap winding, is studied in detail. Both numerical simulations and experimental investigations are executed to analyze the acoustic behavior of the electric wheel hub motor. For the numerical analyses a holi...

In the present contribution we are going to investigate a special class of acoustic metamaterials, i.e. synthetic foams with spherical inclusions. This study is motivated by the need for an improved acoustical behavior of engines and vehicles which is one important criterion for the automotive industry. In this context, innovative materials offerin...

Partial differential equations arising in many physical problems are most commonly solved by using the finite element method (FEM). Despite being very versatile, the FEM has one crucial drawback when heterogeneous material systems are considered, i.e. it relies on geometry‐conforming discretization. This meshing process often constitutes a bottlene...

In the context of environmentally friendliness the electrification of passenger cars becomes more and more important. In this paper an innovative concept for designing the electrical drive of automobiles is presented which allows optimizing the acoustic behaviour on a virtual basis. In special, the acoustics of an electric wheel hub motor is studie...

Keynote Lecture

Already in an early stage of the design process the manufacturer has to be enabled to estimate the performance of new products. Thus, the design can be favorably influenced from the first draft in order to reach specific goals. Furthermore, expensive prototypes are only required to be built for the final testing. The aim of the current contribution...

Die Elektrifizierung von Kraftfahrzeugen ist ein hochaktuelles Thema. In diesem Zusammenhang sind elektri-sche Radnabenmotoren eine innovative Möglichkeit, die Fahrdynamik in Kombination mit einer hohen Leis-tungsdichte zu verbessern. Allerdings stellen die für Elektromaschinen charakteristischen hochfrequenten Ge-räuschemissionen für Passagiere un...

The paper presents an overall simulation approach to control the noise emission of car engines at a very early stage of the design process where no real prototypes are available. The suggested approach combines different physical models and couples different software tools such as multi-body analysis, fluid dynamics, structural mechanics, magneto-e...