Optimization of structural dynamic behaviour based on effective modal parameters

To cite this version:Sébastien Besset, Louis Jezequel. Optimization of characteristics of porous materials based on a modal synthesis method. AbstractComplex 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.

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“…It has the same geometry of the structure considered in [5]. The geometry of the structure is shown in the figure 1:…”

Section: Modal Analysis Of the Structurementioning

confidence: 99%

“…It has already been done in the case of a structural problem [5] and has been extended to the case of a coupled fluid-structure system [6].…”

Section: Introductionmentioning

confidence: 99%

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

Besset

Jézéquel

2009

European Journal of Mechanics - A/Solids

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“…The criteria proposed in this paper are derived from those developed by P. Lemerle [5], using Craig & Bampton's method to describe the dynamic behaviour of a structure. They have already been used to optimize coupled fluid-structure systems in [6,7]. The modal synthesis technique described here to compute the criteria is based on the "double modal synthesis" proposed by Jézéquel [8,9] and extended to the case of fluid-structure systems [4].…”

Section: Introductionmentioning

confidence: 99%

Modal criteria for optimization of structures through active structural acoustic control

Besset¹,

Jézéquel²

2010

Numerical Meth Engineering

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To cite this version:Sébastien Besset, Louis Jezequel. Modal criteria for optimization of structures through active structural acoustic control. International Journal for Numerical Methods in Engineering, Wiley, 2010, 82 (12) Abstract This paper deals with modal criteria allowing optimization of structures through structural acoustic control (ASAC) based on the independent modal strategy control (IMSC). The aim of the paper is to propose efficient criteria allowing to process optimization of structures by determining the most important modes to control considering only the location of the excitation on the structure. A generalized modal synthesis is used to study the coupled fluid-structure system. Modal criteria are proposed in order to determine the best choice for the controlled modes used in IMSC method. The way the ASAC will be applied is not discussed in the paper. Numerical simulations are computed to show the efficiency of the method, considering a simple vibroacoustic structure.

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Modal criteria for optimizing the acoustic behaviour of a coupled fluid–structure system based on a systemic approach

Besset

Jézéquel

2007

Numerical Meth Engineering

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This paper proposes modal criteria to represent various noise sources within a complex structure, such as an automobile. By optimizing a complex system using criteria linked to modal mass and stiffness matrices, different modes of noise propagation can be investigated separately. Several criteria are thus suggested, each related to a vibrational propagation path. Since the system is studied using modal analysis, criteria can be found based on modes associated with the structure's hollow parts, plates, and cavities. These different criteria are analysed based on the assumption of a complex vibroacoustic system. It is shown that by analysing such criteria, one can determine which part of the structure needs to be optimized. The optimization of such a system could constitute a research topic in its own right, and is beyond the scope of the present paper. Copyright © 2007 John Wiley & Sons, Ltd.

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Optimization of structural dynamic behaviour based on effective modal parameters

Cited by 7 publications

References 6 publications

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

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

Modal criteria for optimization of structures through active structural acoustic control

Modal criteria for optimizing the acoustic behaviour of a coupled fluid–structure system based on a systemic approach

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