Optimization of characteristics of porous materials based on a modal synthesis method

• Published in: European journal of mechanics, A, Solids Vol. 28; no. 1; pp. 102 - 109
• Main Authors: Besset, S., Jézéquel, L.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Masson SAS 01-01-2009; Elsevier
• Subjects: Acoustics; Automotive components; Degrees of freedom; Engineering Sciences; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Holes; Mathematical analysis; Mathematical models; Mechanics; Modal analysis; Optimization; Physics; Porous materials; Porous media; Structural acoustics and vibration; Structural mechanics; Synthesis; Vibrations; Porous media; Modal analysis; Optimization; Cavity; Internal noise; Automobile industry; Mode component synthesis; Fluid structure interaction; Porous material; Structural acoustics
• ISSN: 0997-7538; 1873-7285
• DOI: 10.1016/j.euromechsol.2008.03.003

Complex structures used in the automotive industry often include porous materials, in order to reduce the noise in acoustic cavities. The method proposed in this paper aims at optimizing the characteristics of these porous materials using modal criteria based on the modal analysis of the structure. The use of a generalize modal synthesis method allow to describe the structure and the cavities with sets of modes; the size of the resulting system is smaller, for only generalized degrees of freedom are used for each part of the coupled fluid–structure system. First, a modelization of the porous media is proposed, and the generalized modal analysis method is explained. An optimization is then processed on the thickness of the porous materials.