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    Introduction to Acoustics
    Introduction to Acoustics
    Introduction to Acoustics
    Ebook73 pages3 hours

    Introduction to Acoustics

    By Simone Malacrida

    ()

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    About this ebook

    The following topics are presented in this book:
    introduction to waves and their properties
    acoustic waves
    human acoustics and phonometric systems
    room acoustics and hints of building acoustic design

    LanguageEnglish
    PublisherSimone Malacrida
    Release dateDec 21, 2022
    ISBN9798201753382
    Introduction to Acoustics
    Author

    Simone Malacrida

    Simone Malacrida (1977) Ha lavorato nel settore della ricerca (ottica e nanotecnologie) e, in seguito, in quello industriale-impiantistico, in particolare nel Power, nell'Oil&Gas e nelle infrastrutture. E' interessato a problematiche finanziarie ed energetiche. Ha pubblicato un primo ciclo di 21 libri principali (10 divulgativi e didattici e 11 romanzi) + 91 manuali didattici derivati. Un secondo ciclo, sempre di 21 libri, è in corso di elaborazione e sviluppo.

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      Book preview

      Introduction to Acoustics - Simone Malacrida

      Introduction to Acoustics

      SIMONE MALACRIDA

      The following topics are presented in this book:

      introduction to waves and their properties

      acoustic waves

      human acoustics and phonometric systems

      room acoustics and hints of building acoustic design

      Simone Malacrida (1977)

      Engineer and writer, has worked on research, finance, energy policy and industrial plants.

      ANALYTICAL INDEX

      ––––––––

      INTRODUCTION

      ––––––––

      I – THE WAVES

      Definitions

      Wave equation

      Waves on a rope

      Sound waves in a gas

      harmonic waves

      Fourier series decomposition

      Spherical waves

      Wave properties

      Standing waves e

      ––––––––

      II - HUMAN ACOUSTIC

      Ear um no

      Phonometry

      ––––––––

      III - APPLIED ACOUSTICS

      Sound absorbing materials

      Environmental acoustics

      The noise

      INTRODUCTION

      This book presents a broad overview of acoustic phenomena, starting from the physical foundations, given by the properties of waves.

      The mathematical and physical characteristics of the waves are analysed, especially as regards the acoustic ones, which require a means of propagation.

      Subsequently, a detailed description of the human ear and how our body perceives and processes sounds will be provided, to then move on to phonometric and acoustic measurement systems.

      Finally, all aspects of applied acoustics will not be forgotten, from the choice of sound-absorbing materials to the design of rooms with particular acoustics, passing through practical and empirical cases.

      A final mention will be dedicated to noise abatement.

      To understand this manual, it is necessary to have mathematical pre-requisites based on mathematical analysis, especially as regards Fourier series, the concepts of integral and differential equation.

      I

      THE WAVES

      Definitions

      ––––––––

      A wave is a perturbation, periodic or impulsive, which propagates with a defined speed.

      The waves originate from a source that produces the disturbance.

      There are many types of waves: waves of mechanical origin, such as elastic waves (eg sound waves in a gas), or seismic waves generated in earthquakes, or waves on the surface of a liquid.

      All these types of waves can only propagate in the presence of a medium and are generated by the vibration of a source which sets the particles of the surrounding medium in motion.

      Then there are the electromagnetic waves, generated by a motion of electric charges; for their propagation they do not need the support of a medium, but they can also propagate in a vacuum.

      Although the wave propagates in a medium, there is no net transport of matter: the atoms or molecules of the medium are set in motion and oscillate around equilibrium positions.

      Instead, the wave carries momentum and energy.

      The wave is described as the perturbation, with respect to the equilibrium configuration, of an appropriate field; the field can be scalar (eg pressure field for sound waves), or vectorial (eg electromagnetic field for electromagnetic waves).

      We describe the field perturbation as a function of the spatial coordinates x, y, z, and time t.

      This function can be periodic or impulsive .

      However, if it has to account for a phenomenon that moves with speed v , the spatial and temporal coordinates must satisfy a suitable condition.

      Any function like:

      describes a wave that propagates with speed v along the x axis , in one

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