La modélisation de la propagation acoustique sous-marine PDF Download
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Author: Loïc Michel
Publisher:
ISBN:
Category :
Languages : fr
Pages : 310
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Book Description
Author: Loïc Michel
Publisher:
ISBN:
Category :
Languages : fr
Pages : 310
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Book Description
Author: Paul C. Etter
Publisher: CRC Press
ISBN: 1466564946
Category : Technology & Engineering
Languages : en
Pages : 521
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Book Description
Underwater Acoustic Modeling and Simulation, Fourth Edition continues to provide the most authoritative overview of currently available propagation, noise, reverberation, and sonar-performance models. This fourth edition of a bestseller discusses the fundamental processes involved in simulating the performance of underwater acoustic systems and emphasizes the importance of applying the proper modeling resources to simulate the behavior of sound in virtual ocean environments. New to the Fourth Edition Extensive new material that addresses recent advances in inverse techniques and marine-mammal protection Problem sets in each chapter Updated and expanded inventories of available models Designed for readers with an understanding of underwater acoustics but who are unfamiliar with the various aspects of modeling, the book includes sufficient mathematical derivations to demonstrate model formulations and provides guidelines for selecting and using the models. Examples of each type of model illustrate model formulations, model assumptions, and algorithm efficiency. Simulation case studies are also included to demonstrate practical applications. Providing a thorough source of information on modeling resources, this book examines the translation of our physical understanding of sound in the sea into mathematical models that simulate acoustic propagation, noise, and reverberation in the ocean. The text shows how these models are used to predict and diagnose the performance of complex sonar systems operating in the undersea environment.
Author: Xavier Lurton
Publisher: Editions Quae
ISBN: 9782905434920
Category : Science
Languages : fr
Pages : 114
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Book Description
Les ondes sonores constituent le seul moyen d'investigation et de transmission à grande distance utilisable en pratique dans le milieu marin. Apparue au début du XXe siècle, l'acoustique sous-marine est devenue une des technologies essentielles utilisées pour l'exploration et l'exploitation des océans à des fins scientifiques, industrielles ou militaires. Elle peut prétendre jouer aujourd'hui dans l'océan le même rôle que les ondes radio et radar dans l'atmosphère et dans l'espace, et est largement employée dans les domaines de la navigation, de la pêche, de la défense, de l'océanographie et de l'ingénierie marine. Cet ouvrage présente de manière claire et synthétique les phénomènes physiques fondamentaux régissant les ondes acoustiques sous-marines, les principes de fonctionnement des systèmes sonar, et un panorama de leurs applications.
Author: Aleksandr Nikolaevich Barkhatov
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 116
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Book Description
The book is concerned with the application of modeling techniques and procedures to the investigation of sound propagation in the sea. The modeling method affords a means for studying the laws governing the sound fields in the sea and in other, similar media under controlled laboratory conditions and can be used in underwater acoustics as a coroHary to field experiments. The method has a number of advantages, principal of which are the relative simplicity and low cost of model tests by com parison with fuH-scale tests under oceanic conditions, the high accuracy of acoustical mea surements, excellent reproducibility of the measurement results, and the capability of rapidly varying the experimental conditions, which, unlike the conditions of field experiments, are under complete control. For the modeling of sound propagation in the sea the latter is treated, depending on the problem to be solved, either as a volume-homogeneous medium or as a medium possessing regular and randomly-distributed inhomogeneities. We direct our primary attention in the book to the modeling of layered-inhomogeneous media, but we also discuss separate problems bearing on the study of sound propagation in the sea. It is demonstrated in examples how modeling is employed to investigate the sound field in the ocean for certain typical vertical distributions of the velocity of sound in the ocean.
Author: Paul C. Etter
Publisher: CRC Press
ISBN: 1351679716
Category : Technology & Engineering
Languages : en
Pages : 776
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Book Description
This newest edition adds new material to all chapters, especially in mathematical propagation models and special applications and inverse techniques. It has updated environmental-acoustic data in companion tables and core summary tables with the latest underwater acoustic propagation, noise, reverberation, and sonar performance models. Additionally, the text discusses new applications including underwater acoustic networks and channel models, marine-hydrokinetic energy devices, and simulation of anthropogenic sound sources. It further includes instructive case studies to demonstrate applications in sonar simulation.
Author: Robert J. Urick
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 268
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Book Description
Author: P.C. Etter
Publisher: CRC Press
ISBN: 9780419201908
Category : Architecture
Languages : en
Pages : 364
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Book Description
Underwater Acoustic Modeling provides the only comprehensive source on how to translate our physical understanding of sound in the sea into mathematical formulas solvable by computers.
Author: P.C. Etter
Publisher: CRC Press
ISBN: 0203417658
Category : Technology & Engineering
Languages : en
Pages : 447
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Book Description
Underwater Acoustic Modeling and Simulation examines the translation of our physical understanding of sound in the sea into mathematical models that can simulate acoustic propagation, noise and reverberation in the ocean. These models are used in a variety of research and operational applications to predict and diagnose the performance of complex sonar systems operating in the undersea environment. Previous editions of the book have provided invaluable guidance to sonar technologists, acoustical oceanographers and applied mathematicians in the selection and application of underwater acoustic models. Now that simulation is fast becoming an accurate, efficient and economical alternative to field-testing and at-sea training, this new edition will also provide useful guidance to systems engineers and operations analysts interested in simulating sonar performance. Guidelines for selecting and using available propagation, noise and reverberation models are highlighted. Specific examples of each type of model are discussed to illustrate model formulations, assumptions and algorithm efficiency. Instructive case studies demonstrate applications in sonar simulation.
Author: Frédéric Sturm
Publisher:
ISBN:
Category :
Languages : fr
Pages : 198
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Book Description
DANS DES CAS REALISTES D'ENVIRONNEMENTS OCEANIQUES TRIDIMENSIONNELS, LES VARIATIONS BRUTALES SUIVANT LA DISTANCE ET L'AZIMUT DE LA CELERITE DU SON ET LES INTERACTIONS AVEC LE FOND DE L'EAU PEUVENT AVOIR DES EFFETS SIGNIFICATIFS SUR LA PROPAGATION SONORE, NECESSITANT L'UTILISATION DE MODELES TRIDIMENSIONNELS. NOUS PROPOSONS UN MODELE DE PROPAGATION TRIDIMENSIONNEL BASE SUR UNE APPROXIMATION PARAXIALE DE L'EQUATION D'HELMHOLTZ EN L'ABSENCE DE SYMETRIE CYLINDRIQUE SUR LA GEOMETRIE DU DOMAINE. UNE CARACTERISTIQUE IMPORTANTE DE NOTRE MODELE RESIDE EN UNE PARAXIALISATION DES CONDITIONS AUX LIMITES CONSISTANTE AVEC L'APPROXIMATION PARAXIALE UTILISE SUR L'EQUATION D'HELMHOLTZ. CETTE ETAPE EST ESSENTIELLE DANS L'OBTENTION D'UN PROBLEME AUX LIMITES AVEC CONDITION INITIALE MATHEMATIQUEMENT BIEN-POSE ET DE PROPRIETES D'ENERGIE CORRECTES. NOUS TRANSFORMONS LE DOMAINE PHYSIQUE EN UN DOMAINE DE CALCUL PLUS SIMPLE PAR UTILISATION D'UN CHANGEMENT DE VARIABLES (CE QUI NE NECESSITE AUCUNE APPROXIMATION DES FONDS PENTUS PAR MARCHES D'ESCALIER). LA GEOMETRIE DES FONDS EST AINSI PRISE EN COMPTE DIRECTEMENT AU NIVEAU DE L'EQUATION. NOUS DISCRETISONS LE PROBLEME CONTINU PAR ELEMENTS FINIS EN IMMERSION ET EN AZIMUT ET PAR UN SCHEMA D'INTEGRATION EN DISTANCE DE TYPE IMPLICITE. NOTRE SCHEMA PRESERVE LA PROPRIETE D'ENERGIE DU PROBLEME CONTINU. NOUS EFFECTUONS UNE ETUDE DE CONVERGENCE DU SCHEMA. NOUS RESOLVONS LE PROBLEME DISCRET PAR UTILISATION D'UNE METHODE ITERATIVE PRECONDITIONNEE. NOUS PRESENTONS DES SIMULATIONS NUMERIQUES SUR PLUSIEURS CAS TESTS (PROPAGATIONS EN PRESENCE D'UN PLAN INCLINE ET D'UN FOND RUGUEUX) ET POUR DIFFERENTES FREQUENCES D'EMISSION (SOURCE PONCTUELLE OU CHAMPS INITIAUX DE TYPE MODAL). LES RESULTATS PERMETTENT DE METTRE EN EVIDENCE DES EFFETS DE REFRACTION HORIZONTALE NON PREDITS PAR DES MODELES BIDIMENSIONNELS. UNE ATTENTION PARTICULIERE EST CONSACREE A LA CONVERGENCE DE LA SOLUTION NUMERIQUE PAR RAPPORT A LA DISCRETISATION AZIMUTALE.
Author: A. N. Barkhatov
Publisher: Springer
ISBN: 9781468415834
Category : Technology & Engineering
Languages : en
Pages : 91
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Book Description
The book is concerned with the application of modeling techniques and procedures to the investigation of sound propagation in the sea. The modeling method affords a means for studying the laws governing the sound fields in the sea and in other, similar media under controlled laboratory conditions and can be used in underwater acoustics as a coroHary to field experiments. The method has a number of advantages, principal of which are the relative simplicity and low cost of model tests by com parison with fuH-scale tests under oceanic conditions, the high accuracy of acoustical mea surements, excellent reproducibility of the measurement results, and the capability of rapidly varying the experimental conditions, which, unlike the conditions of field experiments, are under complete control. For the modeling of sound propagation in the sea the latter is treated, depending on the problem to be solved, either as a volume-homogeneous medium or as a medium possessing regular and randomly-distributed inhomogeneities. We direct our primary attention in the book to the modeling of layered-inhomogeneous media, but we also discuss separate problems bearing on the study of sound propagation in the sea. It is demonstrated in examples how modeling is employed to investigate the sound field in the ocean for certain typical vertical distributions of the velocity of sound in the ocean.
