title: A modal-based reduction method for sound absorbing porous materials in poro-acoustic finite element models.
abstract: Structural-acoustic finite element models including three-dimensional (3D) modeling of porous media are generally computationally costly. While being the most commonly used predictive tool in the context of noise reduction applications, efficient solution strategies are required. In this work, an original modal reduction technique, involving real-valued modes computed from a classical eigenvalue solver is proposed to reduce the size of the problem associated with the porous media. In the form presented in this contribution, the method is suited for homogeneous porous layers. It is validated on a 1D poro-acoustic academic problem and tested for its performance on a 3D application, using a subdomain decomposition strategy. The performance of the proposed method is estimated in terms of degrees of freedom downsizing, computational time enhancement, as well as matrix sparsity of the reduced system.
authors.affiliation: Structural Mechanics and Coupled Systems Laboratory (LMSSC), Conservatoire National des Arts et Métiers (CNAM), Mechanics, Case 2D6R10, 2 Rue Conté, 75003 Paris, France. rumpler@kth.se
authors.forename: Romain
authors.initials: R
authors.lastname: Rumpler
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Deü
authors.forename: Peter
authors.initials: P
authors.lastname: Göransson
mesh_terms: D000042:Absorption; D000162:Acoustics; D003198:Computer Simulation; D003252:Construction Materials; D004548:Elasticity; D004867:Equipment Design; D005160:Facility Design and Construction / Q000295:instrumentation / Q000379:methods; D020342:Finite Element Analysis; D008962:Models, Theoretical; D009038:Motion; D009622:Noise / Q000517:prevention & control*; D009716:Numerical Analysis, Computer-Assisted; D016062:Porosity; D015203:Reproducibility of Results