Recent developments in Code_Aster to compute FRF and modes of VEM with frequency dependent properties
Résumé
ViscoElastic Materials (VEM) are intensively used to solve NVH issues. Damping pads and anti flutter products reduce the structure borne noise. Sealants and absorbing materials prevent the air borne transmission. Adhesives are common solutions to assemble parts. Whereas VEM are well known, the finite element analysis of their dynamic behavior is not straightforward. Most of the time, the use of a computer aided engineering software requires to simplify VEM as standard elastic materials. This simplification is not always the obvious thing to do and may lead to inaccurate results. The paper tackles the way how advanced capabilities are introduced in Code_Aster to take into account frequency dependent properties of VEM. The computing of frequency response functions and modes of vibration (real or complex) is addressed. Having frequency dependent modes is a step forward for the modal projection method and for the model updating with an experimental modal basis as a reference. The new capabilities are then compared with the standard approaches in the case of an automotive windshield. Two VEM are considered: the windshield bonding and the polyvinylbutyral of the laminated glass.
Domaines
Acoustique [physics.class-ph]
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