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Manipulation Of Sound Properties By Acoustic Metasurface And Metastructure
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Book Synopsis Manipulation of Sound Properties by Acoustic Metasurface and Metastructure by : Jiajun Zhao
Download or read book Manipulation of Sound Properties by Acoustic Metasurface and Metastructure written by Jiajun Zhao and published by Springer. This book was released on 2016-08-06 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis focuses on the manipulation of sound properties by artificial materials. It elaborates on the fundamental design of acoustic metasurfaces and metastructures as the extension of metamaterials, and their functionality in the manipulation of sound properties. A broad and comprehensive guideline of designing acoustic metasurfaces and metastructures is also provided. Based on the proposed subwavelength metasurfaces and the metastructures with a simplified layout, multiple potential applications are demonstrated. This thesis will appeal to acoustic engineers and researchers who are interested in designing acoustic artificial structures.
Book Synopsis Sound Visualization and Manipulation by : Yang-Hann Kim
Download or read book Sound Visualization and Manipulation written by Yang-Hann Kim and published by John Wiley & Sons. This book was released on 2013-08-30 with total page 469 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unique in addressing two different problems – sound visualization and manipulation – in a unified way Advances in signal processing technology are enabling ever more accurate visualization of existing sound fields and precisely defined sound field production. The idea of explaining both the problem of sound visualization and the problem of the manipulation of sound within one book supports this inter-related area of study. With rapid development of array technologies, it is possible to do much in terms of visualization and manipulation, among other technologies involved with the spatial distribution of sound. This book aims to explore various basic functions for the visualization and manipulation and demonstrate to the reader how these properties determine the quality of visualization and manipulation. The first half of the book introduces some basic and general concepts and theories and the second part of the book explains a number of techniques in sound visualization and manipulation. It offers a unified presentation to two very different topics - sound field visualization techniques based on microphone arrays, and techniques for generation of controlled sound fields using loudspeaker arrays. The authors emphasize the similarities between these two physical problems and between the mathematical methods used for solving them. With extensive examples throughout the book, chapters include: Acoustic Wave Equation and its Basic Physical Measures, Acoustic Wave Equation and its Basic Physical Measures, Basic Theory of Sound Visualization, Acoustic Holography, Beamforming, Basic Theory of Sound Manipulation, Sound Focusing, and Sound Field Reproduction. The first book to combine both the visualization and manipulation of sound technologies in one comprehensive volume Presents the basic concepts using simple one dimensional cases and then extends the concept to three dimensional cases, enabling easier understanding of the fundamental concepts through the use of minimum mathematics Provides a solid understanding of associated physics as well as mathematical concepts for understanding the technologies, addressing diffraction problems in an integrated format by using Kirchhoff-Helmholtz integral equation Uses extensive examples demonstrating the benefits and drawbacks of various applications, including beamforming and acoustic holography A valuable resource forpost/graduate students, acoustic engineers, audio and noise control system developers
Book Synopsis The Manipulation of Sound with Acoustic Metamaterials by : Gareth Paul Ward
Download or read book The Manipulation of Sound with Acoustic Metamaterials written by Gareth Paul Ward and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlocality and Willis Coupling in Acoustic Metamaterials and Metasurfaces by : Li Quan (Ph. D.)
Download or read book Nonlocality and Willis Coupling in Acoustic Metamaterials and Metasurfaces written by Li Quan (Ph. D.) and published by . This book was released on 2020 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic metamaterials and metasurfaces are artificial materials and surfaces composited with meta-atoms and inclusions at the subwavelength scale but behave homogeneously in the macroscopic scale with unusual properties in the manipulation of sound waves. Most of the research in this field has focused so far on the study of the local response of the materials and surface properties but neglected the nonlocality. This dissertation focuses on the study of nonlocal phenomena in acoustics, and explore their unusual abilities in the control and manipulation of sound waves. The dissertation starts with the exploration of pressure-velocity coupling phenomena, also known as Willis coupling or acoustic bianisotropy, in a single subwavelength inclusion and derived general bounds on the Willis response of acoustic scatterers, indicating these bounds can be reached through proper design. A systematic design approach of reciprocal Willis inclusion has been outlined for the realistic implementation of acoustic inclusions with Willis response from zero, mild to maximum. My study shows that reciprocal Willis responses can be mainly attributed to geometrical asymmetries. By breaking the system’s time-reversal symmetry through bias flow, Willis coupling has also been observed in geometry-symmetrical systems. Then, I changed my viewpoint from single inclusion to the collective response of metamaterials at the macroscopic level. By combining moving media with zero-index acoustic propagation, giant bianisotropy and extreme nonreciprocity were achieved in the metamaterials with modest mechanical motion. This special acoustic response was utilized to induce non-reciprocal positive-to-negative sound refraction and the non-reciprocal metamaterial lens which could focus object when the excitation is from a specific side. Finally, the study was extended to metasurface, and explore their unusual properties by considering the strong coupling between neighboring elements. The general impedance relation with the consideration of coupling between neighboring elements was proposed and the mechanism was applied to the design of nonlocal passive metasurfaces which could overcome the limitations of local designs, and achieve unitary efficiency for extreme beam steering. The nonlocal metasurface has also been applied to the design of acoustic hyperbolic metasurface requiring extreme anisotropic impedance which was considered impossible in the local metasurface
Book Synopsis New Acoustics Based on Metamaterials by : Woon Siong Gan
Download or read book New Acoustics Based on Metamaterials written by Woon Siong Gan and published by Springer. This book was released on 2017-12-10 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the acoustical metamaterials’ capability to manipulate the direction of sound propagation in solids which in turn control the scattering, diffraction and refraction, the three basic mechanisms of sound propagation in solids. This gives rise to several novel theories and applications and hence the name new acoustics. As an introduction, the book mentions that symmetry of acoustic fields is the theoretical framework of acoustical metamaterials. This is then followed by describing that acoustical metamaterials began with locally resonant sonic materials which ushered in the concept of negative acoustic parameters such as mass density and bulk modulus. This complies with form invariance of the acoustic equation of motion which again exemplifies the symmetry property of acoustic fields.
Book Synopsis Electromagnetic Inspired Acoustic Metamaterials: Studying the Applications of Sound-Metastructures Interactions Based on Different Wave Phenomena by : Seyyed Hussein Seyyed Esfahlani
Download or read book Electromagnetic Inspired Acoustic Metamaterials: Studying the Applications of Sound-Metastructures Interactions Based on Different Wave Phenomena written by Seyyed Hussein Seyyed Esfahlani and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Mots-clés de l'auteur: Acoustic Metamaterials ; Electromagnetic Metamaterials ; Composite Right/Left Hand Metamaterials ; Transmission-Line Metamaterials ; Acoustic Leaky-wave Antenna ; Acoustic Dispersive Prism ; Acoustic Single Sensor Direction Finder ; Acoustic Metasurface ; Acoustic Reflectarray ; Acoustic Orbital Angular Momentum Metasurface.
Book Synopsis Metamaterial-based Acoustic Devices for Audio and Ultrasound Applications by : Jun Ji
Download or read book Metamaterial-based Acoustic Devices for Audio and Ultrasound Applications written by Jun Ji and published by . This book was released on 2024 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Acoustic metamaterials are artificially engineered materials or structures that exhibit exotic acoustic properties that are not found in nature. They have been a highly active research area to control the behavior of acoustic waves in recent years. Acoustic metasurfaces, as the 2D version of acoustic metamaterials, have opened up unprecedented possibilities for controlling acoustic waves at will, offering a solution of molding wave propagation within a thin sheet of structures. While the majority of the research in acoustic metamaterials and metasurfaces are curiosity-driven and have shown promising progress in overcoming the fundamental physical limitations of acoustics, there has been a scarcity of acoustic metamaterials research that can have a direct and immediate impact on real-world applications. This thesis makes contributions to the fields of acoustic metamaterials by examining the challenges of some real-world applications at audio and ultrasound frequencies and putting forward novel metamaterial-based acoustic devices that overcome these limitations. In this thesis, we start to tackle the ultra-low frequency (below 100 Hz) sound absorption problem, which is a long-standing issue in room acoustics, by designing a low-frequency broadband, high absorption, near-omnidirectional acoustic metasurface absorber at a deep subwavelenth thickness guided by the causality limit. Then we extend the sound absorption in room acoustics to HVAC system, fundamentally from a one-port system without acoustic transmission to a two-ports system with acoustic transmission. A near-perfect absorption (99% absorption) is demonstrated when the spatial period of monopole-dipole resonators is close to one working wavelength (95% of the wavelength). The condition for perfect absorption is to render degenerate monopole-dipole resonators critically coupled. Besides absorption, loudness enhancement of acoustic transducers is another challenging issue at low audio frequency band. By leveraging the resonant coupling effect between the transducer and metamaterial resonances, a 3--7 dB broadband sound pressure level (SPL) improvement of acoustic radiation in the bass range (50--700 Hz) can be achieved. In addition to airborne acoustics at low audio frequency, enormous underwater applications at ultrasound frequency exist. One of the application challenges along this direction is the weak ultrasound transmission through a metallic wall due to the significant impedance mismatch between water and the wall, which impedes wireless ultrasonic power transfer and data transmission in aeronautic and aerospace engineering and nuclear engineering. We design a pillar-based acoustic metamaterial for wireless and contactless ultrasonic power transfer and data transmission through a metallic wall by leveraging the pillar's vertical elongation mode.
Book Synopsis Acoustic Metamaterials by : Richard Craster
Download or read book Acoustic Metamaterials written by Richard Craster and published by Springer. This book was released on 2024-07-17 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The revised edition of this book offers an expanded review of acoustic metamaterials; novel materials which can manipulate sound waves in surprising ways, which include collimation, focusing, cloaking, sonic screening and extraordinary transmission. It covers both experimental and theoretical aspects of acoustic and elastic waves propagating in structured composites, with a focus on effective properties associated with negative refraction, lensing and cloaking. Updated chapters cover filtering effects, extraordinary transmission, sub-wavelength imaging via tomography or time-reversal techniques, cloaking via transformation acoustics, elastodynamics, and acoustic scattering cancellation. For this revised edition, three new chapters have been introduced to reflect developments in experimental acoustics and metasurfaces, resonators atop surfaces and elastic metamaterials. The broad scope gives the reader an overview of the state of the art in acoustic metamaterials research and an indication of future directions and applications. It will serve as a solid introduction to the field for advanced students, and a valuable reference for those working in metamaterials and related areas.
Book Synopsis Acoustic Metamaterials by : Richard V. Craster
Download or read book Acoustic Metamaterials written by Richard V. Craster and published by Springer. This book was released on 2012-12-05 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: About the book: This book is the first comprehensive review on acoustic metamaterials; novel materials which can manipulate sound waves in surprising ways, which include collimation, focusing, cloaking, sonic screening and extraordinary transmission. It covers both experimental and theoretical aspects of acoustic and elastic waves propagating in structured composites, with a focus on effective properties associated with negative refraction, lensing and cloaking. Most related books in the field address electromagnetic metamaterials and focus on numerical methods, and little (or no) experimental section. Each chapter will be authored by an acknowledged expert, amongst the topics covered will be experimental results on non-destructive imaging, cloaking by surface water waves, flexural waves in thin plates. Applications in medical ultrasound imaging and modeling of metamaterials will be emphasized too. The book can serve as a reference for researchers who wish to build a solid foundation of wave propagation in this class of novel materials.
Book Synopsis Acoustic Manipulation of Sound with Soft Material-based Actuators by : Yanjun Wang
Download or read book Acoustic Manipulation of Sound with Soft Material-based Actuators written by Yanjun Wang and published by . This book was released on 2015 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Improved Sound Diffusion Using Spatio-temporally Modulated Acoustic Metasurfaces by : Janghoon Kang
Download or read book Improved Sound Diffusion Using Spatio-temporally Modulated Acoustic Metasurfaces written by Janghoon Kang and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional acoustic diffuser designs are phase gratings on reflecting surfaces which are used to reduce specular reflections and the strength of room modes. Traditional designs have some requirements that limit implementation in practice, such as a thickness that is inversely proportional to the design frequency and directional scattering that results from the periodic arrangement of diffuser unit cells. This work investigates two different acoustic metasurface (AMS) designs as solutions to reduce thickness without compromising diffuser performance and to achieve improved sound diffusion for a given geometry. A coiled-space AMS design is proposed to reduce diffuser thickness by designing long and tortuous channels with minimal loss to enable tailored phase variation with minimally thick diffuser elements. Dimensions found from a parametric study using the finite element method (FEM), AMS diffuser elements with a quarter of the original depth were fabricated using additive manufacturing and experimentally shown to produce the desired reflected field phase while minimizing absorption. Impedance tube tests of individual unit cells and measurements of the scattered field from a two-dimensional diffuser in an anechoic chamber demonstrated comparable performance between the coiled-space AMS design and a conventional quadratic residue diffuser (QRD). Spatiotemporal modulation of surface acoustic admittance in a wave-like manner was investigated theoretically and experimentally to improve the diffusivity of acoustic scattering from a reflective surface with a specified geometry. A semi-analytical model of the scattered sound field from spatiotemporally modulated diffuser surface was developed using Fourier series expansion of diffraction modes that includes harmonics of the admittance modulation frequency. The presence of modulation harmonics scatters sound in additional directions compared to those of the unmodulated diffuser, thereby improving diffusivity of the scattered sound field. The polar responses of the scattered field predicted by the semi-analytical model were verified by comparison with a transient numerical simulation using the finite element method (FEM). Performance improvements were experimentally verified by modifying the termination of the conventional QRD design through the addition of a compliant piezoelectric bender disk terminated with a negative capacitance shunting circuit. The electrical termination of the piezoelectric disk is then switched between open-circuit and negative capacitance circuit conditions using a computer-controlled solid-state relay switch to create a square-wave modulation function of the termination impedance. Modulation harmonics in the reflected field were observed using the impedance tube tests. Furthermore, measurements of a spatiotemporally modulated QRD in an anechoic environment lead to the observation of modulation harmonics with angle-dependent magnitudes that are functions of the modulation directions in good agreement with predictions of the semi-analytical model. These measurement results demonstrate the effectiveness of the spatiotemporal modulation of the surface acoustic admittance in both time and space
Book Synopsis Propagation of Sound in Porous Media by : J.F. Allard
Download or read book Propagation of Sound in Porous Media written by J.F. Allard and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has grown out of the research activities of the author in the fields of sound propagation in porous media and modelling of acoustic materials. It is assumed that the reader has a background of advanced calculus, including an introduction to differential equations, complex variables and matrix algebra. A prior exposure to theory of elasticity would be advantageous. Chapters 1-3 deal with sound propagation of plane waves in solids and fluids, and the topics of acoustic impedance and reflection coefficient are given a large emphasis. The topic of flow resistivity is presented in Chapter 2. Chapter 4 deals with sound propagation in porous materials having cylindrical pores. The topics of effective density, and of tortuosity, are presented. The thermal exchanges between the frame and the fluid, and the behaviour of the bulk modulus of the fluid, are described in this simple context. Chapter 5 is concerned with sound propagation in other porous materials, and the recent notions of characteristic dimensions, which describe thermal exchanges and the viscous forces at high frequencies, are introduced. In Chapter 6, the case of porous media having an elastic frame is considered in the context of Biot theory, where new topics described in Chapter 5 have been included.
Book Synopsis Acoustic Metamaterials and Phononic Crystals by : Pierre A. Deymier
Download or read book Acoustic Metamaterials and Phononic Crystals written by Pierre A. Deymier and published by Springer Science & Business Media. This book was released on 2013-01-13 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive book presents all aspects of acoustic metamaterials and phononic crystals. The emphasis is on acoustic wave propagation phenomena at interfaces such as refraction, especially unusual refractive properties and negative refraction. A thorough discussion of the mechanisms leading to such refractive phenomena includes local resonances in metamaterials and scattering in phononic crystals.
Book Synopsis Vibration Control by : Mickaël Lallart
Download or read book Vibration Control written by Mickaël Lallart and published by BoD – Books on Demand. This book was released on 2010-08-18 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibrations are a part of our environment and daily life. Many of them are useful and are needed for many purposes, one of the best example being the hearing system. Nevertheless, vibrations are often undesirable and have to be suppressed or reduced, as they may be harmful to structures by generating damages or compromise the comfort of users through noise generation of mechanical wave transmission to the body. the purpose of this book is to present basic and advanced methods for efficiently controlling the vibrations and limiting their effects. Open-access publishing is an extraordinary opportunity for a wide dissemination of high quality research. This book is not an exception to this, and I am proud to introduce the works performed by experts from all over the world.
Book Synopsis Physics of Negative Refraction and Negative Index Materials by : Clifford M. Krowne
Download or read book Physics of Negative Refraction and Negative Index Materials written by Clifford M. Krowne and published by Springer Science & Business Media. This book was released on 2007-08-14 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the subject of optical and electronic negative refraction (NR) and negative index materials NIM). Diverse approaches for achieving NR and NIM are covered, such as using photonic crystals, phononic crystals, split-ring resonators (SRRs) and continuous media, focusing of waves, guided-wave behavior, and nonlinear effects. It is perhaps the most comprehensive book on the new class of negative refraction materials, covering all aspects of negative refraction and negative index materials.
Book Synopsis Acoustic Metamaterials by : Richard V. Craster
Download or read book Acoustic Metamaterials written by Richard V. Craster and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 333 pages. Available in PDF, EPUB and Kindle. Book excerpt: About the book: This book is the first comprehensive review on acoustic metamaterials; novel materials which can manipulate sound waves in surprising ways, which include collimation, focusing, cloaking, sonic screening and extraordinary transmission. It covers both experimental and theoretical aspects of acoustic and elastic waves propagating in structured composites, with a focus on effective properties associated with negative refraction, lensing and cloaking. Most related books in the field address electromagnetic metamaterials and focus on numerical methods, and little (or no) experimental section. Each chapter will be authored by an acknowledged expert, amongst the topics covered will be experimental results on non-destructive imaging, cloaking by surface water waves, flexural waves in thin plates. Applications in medical ultrasound imaging and modeling of metamaterials will be emphasized too. The book can serve as a reference for researchers who wish to build a solid foundation of wave propagation in this class of novel materials.
Book Synopsis Acoustic Waves in Periodic Structures, Metamaterials, and Porous Media by : Noé Jiménez
Download or read book Acoustic Waves in Periodic Structures, Metamaterials, and Porous Media written by Noé Jiménez and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book delivers a comprehensive and up-to-date treatment of practical applications of metamaterials, structured media, and conventional porous materials. With increasing levels of urbanization, a growing demand for motorized transport, and inefficient urban planning, environmental noise exposure is rapidly becoming a pressing societal and health concern. Phononic and sonic crystals, acoustic metamaterials, and metasurfaces can revolutionize noise and vibration control and, in many cases, replace traditional porous materials for these applications. In this collection of contributed chapters, a group of international researchers reviews the essentials of acoustic wave propagation in metamaterials and porous absorbers with viscothermal losses, as well as the most recent advances in the design of acoustic metamaterial absorbers. The book features a detailed theoretical introduction describing commonly used modelling techniques such as plane wave expansion, multiple scattering theory, and the transfer matrix method. The following chapters give a detailed consideration of acoustic wave propagation in viscothermal fluids and porous media, and the extension of this theory to non-local models for fluid saturated metamaterials, along with a description of the relevant numerical methods. Finally, the book reviews a range of practical industrial applications, making it especially attractive as a white book targeted at the building, automotive, and aeronautic industries.
