Alba Fernández J., Ramis Soriano J., Segura J., Ivorra Chorro S.

At present, there are numerous studies and investigations carried out searching for materials with adequate acoustics properties for determined applications.In this communication, basing on numerical, analytic and experimental techniques, it is carries out the acoustic and dynamic characterization of a series of multilayered panels formed by polymers and by-products of the wood. In the experimental part the vibrational behavior of the multilayered panels is analyzed by means of modal analysis: With a specific boundary conditions, the plates are mechanically excited with a impact hammer, the response of the system is obtained in different points of the plate by means of miniature acceleration sensors. From the transfer functions obtained, the modal form and the damping corresponding, as well as the loss factor are determined for each vibration mode. In the analytic approach, a revision of the different analytic theories relative to the acoustic behavior for multilayered panels is carried out, implementing those that reflect better the experimental results obtained for panels of polymers and by-products of the wood. For the numerical simulation the finite element method is used and a three-dimensional model of the plate is built. It is concluded with the comparative of the numerical, analytic, and experimental results obtained.