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Contenido archivado el 2024-04-19

VIBROACOUSTIC MODELLING AND PREDICTION OF TRANSPORTATION VEHICLES DYNAMIC BEHAVIOUR IN THE MEDIUM FREQUENCY RANGE

Objetivo


The main results of the project are multifold. First of all, a number of important method developments have resulted:

* - a consistent model formulation for experimental vibro-acoustic analysis
* - a volume velocity transducer for measuring structural radiated noise strength
* - a pragmatic method to identify linearised FRFs on nonlinear systems and to quantify the nonlinearity through pseudo forces.
* - a method to derive frequency averaged principal field shapes
* - an FRF matrix expansion method
* - an approach for Hybrid Modal Analysis
* - an approach for improved structural damping modelling based on the "Augmented Hooke's Law"
* - an approach for modelling acoustic damping in cavities damped with porous materials, including the updating of such models by experimental data
* - a methodology for hybrid FRF substructuring

Furthermore, significant research results have been obtained with respect to

* - the use of acoustic excitation for structural modal analysis
* - the influence of rotational degrees of freedom in substructuring
* - the use of SVD (singular value decomposition) processing to improve the substructuring process
* - the limits and accuracy of the FRF matrix inversion process with its implications to the various phases of FRF modelling: FRF coupling, FRF expansion, nonlinear analysis, ...
* - the limits of existing (modal and SEA) methods for modelling vibro-acoustic behaviour
* - the study of the powerflow finite element method, applied to specific beam problems.

Finally, the project findings have been integrated in a conceptual approach for global experimental/numerical modelling of complex structures in the medium frequency range.
Transportation vehicle manufacturers are currently facing the challenge to build quieter,more comfortable and more reliable products,as demanded by customer awareness,product competition and stringent environment regulations.

Engineering an optimum structural dynamics performance essentially requires the assessment of a valid vibroacoustic model.Numerous methodologies are currently available for that purpose,each of them only covering specific application areas and frequency ranges.However,obtaining a valid vibroacoustic model of a fully furnished vehicle still is a cumbersome task,since its vibroacoustic behaviour mainsly is situated in the "medium"frequency range,where the dynamic system is too complex either for a "model"approach as for an oversimplifying "statistical"approach.

The prime objective of the project is to develop and validate an integrated vibroacoustic modelling methodology,that by means of a consistent transfer function approach covers the complete (audio-) frequency range.This objective will be reached by integration of a coherent network of activities.

1-development of improved measurement means and test strategies that will lead to more reliable high quality medium data.
2-development and refinement of novel experimental and numerical modelling methodologies,specially appropriate in the medium frequency range.
3-progression of an integrated and consistent substructuring approach,by advancing combined experimental and submodel synthesis techniques.
4-full validation of the developed methodology on a representative breadboard model.

The consortium comprises a software and engineering company,a research institute and four universities.All partners have considerable experience and competence in the field of structural dynamics and noise control engineering.In order to emphasise the industrial relevance of the project,the consortium is endorsed by a number of leading companies of the automotive industry.

Ámbito científico (EuroSciVoc)

Programa(s)

Tema(s)

Convocatoria de propuestas

Datos no disponibles

Régimen de financiación

CSC - Cost-sharing contracts

Coordinador

LMS INTERNATIONAL
Aportación de la UE
Sin datos
Dirección
INTERLEUVENLAAN 68
3001 LEUVEN
Bélgica
Coste total
Sin datos

Participantes (5)