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Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
Logo Leibniz Universität Hannover
Logo: Institut für Baumechanik und Numerische Mechanik/Leibniz Universität Hannover
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Structural Dynamics

Sophisticated optimization techniques for structural health monitoring

Bild zum Projekt Sophisticated optimization techniques for structural health monitoring

Bearbeitung:

M. Sc. Mahmoud M. Jahjouh, Prof. Dr.-Ing. Udo Nackenhorst

Förderung durch:

DAAD – Deutscher Akademischer Austauschdienst

Kurzbeschreibung:

Structural monitoring and damage detection has become a growing area in research and development, as witnessed by the increasing number of relevant journal and conference papers. To this end, a crucial challenge is the development of robust and efficient structural identification methods that can be applied to identify key parameters and hence, cause change of structural state.

 

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Computational techniques for the stochastic excitation of rolling tires from rough road surface contact

Bild zum Projekt Computational techniques for the stochastic excitation of rolling tires from rough road surface contact

Bearbeitung:

Robert Lee Gates, M.Sc.; Prof. Dr.-Ing. Udo Nackenhorst

Förderung durch:

DFG (German Research Foundation)

Kurzbeschreibung:

In this project, we intend to address issues in modeling rolling tires on rough road surfaces by (a) extending previously developed methods by a stochastic excitation function describing the interaction of the macroscopic tire model and the detailed meso-mechanical contact behavior of the tire tread with the road surface; (b) including dynamic stiffening effects in the rubber compound.

 

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Numerical simulation of tire rolling noise radiation

 

Förderung durch:

Supported by BMBF

Kurzbeschreibung:

The structural dynamics of rolling tires is treated by a modal superposition approach whereas the underlying stationary rolling process is modeled within a nonlinear relative kinematics continuum theory.

 

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Reduced-order models for structural dynamic Finite Element systems

Bild zum Projekt Reduced-order models for structural dynamic Finite Element systems

Bearbeitung:

Stefanie Tegtmeyer, Prof. Dr.-Ing. Udo Nackenhorst

Förderung durch:

State of Lower Saxony

Kurzbeschreibung:

Computational models from different engineering fields tend to get more and more detailed and complex thanks to the development of more and more powerful computers. Nowadays, solving these large systems of equations is not impossible, but requires a lot of time and computational resources.

 

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Constitutive modeling of rubber behavior in a broad frequency domain

Bild zum Projekt Constitutive modeling of rubber behavior in a broad frequency domain

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Anuwat Suwannachit

Förderung durch:

This work is supported by German Ministry for Economics within the “Leiser Straßenverkehr 2” program

Kurzbeschreibung:

Mechanical response of technical rubber is usually described by damage and hysteresis behaviour under quasi-static cyclic loading conditions, while dynamic stiffening and viscous effects are predominant for high frequency analysis. For the computation of rolling tire behaviour with questions regarding safety, comfort and sound radiation a constitutive description incorporating all of these effects is needed.

 

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A multi-scale approach on the transient dynamics of rolling tires

Bild zum Projekt A multi-scale approach on the transient dynamics of rolling tires

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Anuwat suwannachit

Förderung durch:

This work is supported by German Ministry for Economics within the “Leiser Straßenverkehr 2” program

Kurzbeschreibung:

The transient dynamic response of rolling tires, which is a major source of traffic noise nowadays, is excited from the tread impact and the road surface texture. A multi-scale approach is introduced in order to investigate the behaviour of tread rubber in contact with rough road surface at a sufficient small length-scale, which leads to the vibration of the overall structure.

 

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Transient dynamic impact of inelastic solids with rough surfaces

Bild zum Projekt Transient dynamic impact of inelastic solids with rough surfaces

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, M.Sc. Anuwat Suwannachit

Förderung durch:

This work is supported by German Research Foundation (DFG)

Kurzbeschreibung:

Since more than two decades a relative kinematic framework (ALE-description) has been widely used for rolling contact analysis of tire-road systems. The well known advantages of the ALE-formulation are the possibility of local mesh refinement in contact region and time-independent formulation of stationary elastic rolling.

 

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ALE-interface coupling for multiscale analysis of treaded tires in rolling contact

Bild zum Projekt ALE-interface coupling for multiscale analysis of treaded tires in rolling contact

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, Dip.-Ing. Raffaela Chiarello, Dipl. Ing. (FH) Ole Stegen

Kurzbeschreibung:

The Arbitrary Lagrangian Eulerian (ALE) formulation is well established for the finite element simulation of stationary as well as transient dynamics rolling contact phenomena. The method enables mesh refinements in the contact zone and a time independent formulation of stationary rolling. The inconvenience for the simulation of rolling tires is the incorrect treatment of the tread blocks due to the non axisymmetric geometry.

 

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Computational Methods for Frictional Rolling Contact

Bild zum Projekt Computational Methods for Frictional Rolling Contact

Bearbeitung:

ext. M. Ziefle

Förderung durch:

This work is financed by the German Research Foundation (DFG), research group FOR492.

Kurzbeschreibung:

The aim of this research project is the development of efficient computation methods for the analysis of frictional rolling contact problems of elastomer solids on rigid surfaces.

 

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A finite element tire modelling approach for car interior noise simulation

 

Bearbeitung:

Prof. Dr.-Ing. Udo Nackenhorst, Dipl.-Ing Raffeala Chiarello

Kurzbeschreibung:

A finite element approach for the simulation of the dynamic behaviour of tires rolling on rough roads for the car indoor noise prediction is presented. Based on a detailed finite element model valid for the nonlinear stationary rolling analysis a modal tire model to be coupled with a total vehicle dynamics simulation approach has been developed, where special care is taken on the physical consistency.

 

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