Wednesday, September 26th, 2018. Time: 15h
Place: O.C. Zienkiewicz Conference Room, C1 Building, UPC Campus Nord, Barcelona
In recent years, there has been a growing interest among the scientific and technological communities in the concept of acoustic metamaterials. In particular, the so called Locally Resonant Acoustic Metamaterials (LRAM) are capable of stopping acoustic waves from propagating in frequency regions in the vicinity of their internal natural frequencies. This enables, for instance, the design of a new kind of lightweight acoustic insulation panels with the ability to attenuate noises in the low frequency range (below 5000 Hz) without the need of large pieces of very dense materials. In this regard, a design procedure based on a computational multiscale homogenization framework has been proposed. The model is grounded on fundamental hypothesis of Continuum Mechanics alongside the Multiscale Virtual Power Principle and allows us to account for inertial effects in the interaction between material scales through a reduced set of degrees of freedom coming from a modal projection of the relevant resonating modes. The model is capable of successfully capturing the local resonance effects and effective macroscopic behaviour induced by LRAM microscales, opening up the path to sophisticated studies of the design of such kind of materials for several targeted applications.
David Roca Cazorla is an Aerospace Engineer currently carrying out his PhD thesis in Mechanical, Fluids and Aeronautical Engineering at the Technical University of Catalonia (UPC) alongside the International Centre for Numerical Methods in Engineering (CIMNE). His research activity is focused on the field of Computational Solid Mechanics and, in particular, on modelling Acoustic Metamaterials.