Design Optimisation and Validation of Phononic Crystal Plates for Manipulation of Elastodynamic Guided Waves
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Beschreibung
This thesis proposes novel designs of phononic crystal plates (PhPs) allowing ultra-wide controllability frequency ranges of guided waves at low frequencies, with promising structural and tunability characteristics. It reports on topology optimization of bi-material-layered (1D) PhPs allowing maximized relative bandgap width (RBW) at target filling fractions and demonstrates multiscale functionality of gradient PhPs. It also introduces a multi-objective topology optimization method for 2D porous PhPs allowing both maximized RBW and in-plane stiffness and addresses the critical role of considering stiffness in designing porous PhPs. The multi-objective topology optimization method is then expanded for designing 2D porous PhPs with deformation induced tunability. A variety of innovative designs are introduced which their maximized broadband RBW is enhanced by, is degraded by or is insensitive to external finite deformation. Not only does this book address the challenges of new topology optimization methods for computational design of phononic crystals; yet, it demonstrated the suitability and applicability of the topological designs by experimental validation. Furthermore, it offers a comprehensive review of the existing optimization-based approaches for the design of finite non-periodic acoustic metamaterial structures, acoustic metamaterial lattice structures and acoustic metamaterials under perfect periodicity.
Nominated as an outstanding PhD thesis by the University of South Australia
Introduces novel topologies of phononic crystals with record-breaking bandgap widths
Discusses various approaches to optimizing porous phononic crystals
Describes the optimization of both bi-material 1D and porous 2D periodic designs
Nominated as an outstanding PhD thesis by University of South Australia, Adelaide, Australia Introduces novel topologies of phononic crystals with record breaking bandgap width and deformation induced tunability Discusses different approaches for optimization of porous phononic crystals Describes optimization of both bi-material 1D and porous 2D periodic design
Autor*in
Saeid Hedayatrasa
Themen in »Design Optimisation and Validation of Phononic Crystal Plates for Manipulation of Elastodynamic Guided Waves«
Topology Optimization Acoustic Metamaterials (AMMs) Acoustic Bandgap Tunable Phononic Bandgap Plates Propagation of Vibroacoustic Waves Flexural Guided Waves Guided Waves in 2D PhPs Topology Optimisation of PhCr Plates Tunable Phononic Bandgap Plates In-plane Stiffness Optimization of Porous Plate Structures 1D Bi-material PhPs Maximising Bandgap Tunability