LEADER 04487nam 22006735 450 001 9910647393203321 005 20230926201727.0 010 $a3-031-22603-8 024 7 $a10.1007/978-3-031-22603-8 035 $a(MiAaPQ)EBC7188502 035 $a(Au-PeEL)EBL7188502 035 $a(CKB)26076448500041 035 $a(DE-He213)978-3-031-22603-8 035 $a(PPN)267808526 035 $a(EXLCZ)9926076448500041 100 $a20230130d2023 u| 0 101 0 $aeng 135 $aurcnu|||||||| 181 $ctxt$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 10$aAcoustic Invisibility for Elliptic Objects$b[electronic resource] $eTheory and Experiments for Underwater Sound /$fby Davide Enrico Quadrelli, Francesco Braghin 205 $a1st ed. 2023. 210 1$aCham :$cSpringer Nature Switzerland :$cImprint: Springer,$d2023. 215 $a1 online resource (93 pages) 225 1 $aPoliMI SpringerBriefs,$x2282-2585 311 08$aPrint version: Quadrelli, Davide Enrico Acoustic Invisibility for Elliptic Objects Cham : Springer,c2023 9783031226021 320 $aIncludes bibliographical references and index. 327 $aIntro -- Preface -- Contents -- 1 Introduction and State of the Art -- References -- 2 Wave Propagation in Periodic Media -- 2.1 Acoustic Waves in Fluids -- 2.2 Elastic Waves in Homogeneous, Isotropic Solids -- 2.3 Elastic Waves in Homogenous, Anisotropic Media -- 2.4 Wave Propagation in Sonic Crystals -- 2.5 Wave Propagation in Phononic Crystals -- 2.6 Long-Wavelength Homogenization -- 2.7 Further Readings -- References -- 3 Transformation Acoustics -- 3.1 Inertial Cloaking -- 3.2 Pentamode Materials and Pentamode Cloaking -- References -- 4 Transformation Acoustics in Elliptic Coordinates -- 4.1 Defining Transformations in Elliptic Coordinates -- 4.2 Selected Examples of Transformations in Elliptic Coordinates -- 4.2.1 Spatially Independent Elasticity Tensor -- 4.2.2 Bulk Moduli Following a Power Law -- 4.2.3 Spatially Independent Density -- 4.3 Numerical Test Cases -- References -- 5 Design and Experimental Validation of an Elliptic Cloak -- 5.1 Problem Setting -- 5.2 Microstructure Design and Validation -- 5.3 Experimental Setup -- 5.4 Results and Discussion -- References. 330 $aThe book investigates acoustic cloaking for elliptical targets, starting from the development of a systematic approach to deal with such non-axisymmetrical shapes by adopting transformation acoustics in elliptic coordinates, and concluding with numerical and experimental validation of a microstructured cloak in the underwater environment. The book thus comprises all the steps from theory to practice that led to the first experimental validation of acoustic invisibility for non-cylindrical objects, whose results are presented in the last chapter. Indeed, despite Transformation Theory is now an established tool to design material distributions capable to unlock the design of invisibility devices, it is not trivial to apply it for shapes different than the sphere and the cylinder, which are thus the ones mainly addressed in the literature. This book paves the way for exploration of other shapes, demonstrating the effectiveness of a pentamode cloak in reducing the acoustic visibility of an elliptical target, and discussing design choices that can make the implementation of the required microstructure less cumbersome despite the lack of axial symmetry of the problem, from both the numerical and manufacturing point of views. 410 0$aPoliMI SpringerBriefs,$x2282-2585 606 $aBuilding materials 606 $aAcoustical engineering 606 $aMetamaterials 606 $aUnderwater acoustics 606 $aSound 606 $aStructural Materials 606 $aEngineering Acoustics 606 $aMetamaterials 606 $aAcoustics 615 0$aBuilding materials. 615 0$aAcoustical engineering. 615 0$aMetamaterials. 615 0$aUnderwater acoustics. 615 0$aSound. 615 14$aStructural Materials. 615 24$aEngineering Acoustics. 615 24$aMetamaterials. 615 24$aAcoustics. 676 $a620.2 700 $aQuadrelli$b Davide Enrico$01277170 702 $aBraghin$b Francesco 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910647393203321 996 $aAcoustic Invisibility for Elliptic Objects$93010127 997 $aUNINA