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Dissertations / Theses on the topic 'Underwater explosions'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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1

Ogilvy, Iver. "Fluid dynamics of underwater explosions." Thesis, University of Birmingham, 2010. http://etheses.bham.ac.uk//id/eprint/8840/.

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The detonation of an explosive in water leads to a complex set of chemical and physical phenomena. When the detonation wave reaches the surface of the explosive it reacts violently with the water, producing a shock wave propagating outwards and also a nearly spherical gaseous bubble of detonation products. The fact that the characteristic time scales of these two phenomena differ by approximately two orders of magnitude has often been exploited by utilising independent models to describe the shock and the bubble. In this thesis both the shock and the bubble are examined using a range of method

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2

Krueger, Seth R. "Simulation of cylinder implosion initiated by an underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Jun%5FKrueger.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2006.<br>Thesis Advisor(s): Young S. Shin. "June 2006." Includes bibliographical references (p. 99-100). Also available in print.

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3

Hart, David T. "Ship shock trial simulation of USS Winston S. Churchill (DDG-81) : surrounding fluid effect /." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FHart.pdf.

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4

Roux, André. "Protection of electronics in submerged enclosures against underwater explosions." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/5476.

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Includes bibliographical references (leaves 185-187).<br>In the milieu of military sea mine design, it is often necessary to design mines that are to be placed at small distances from each other. A possible tactical purpose may require that each mine be set to explode at controlled instances in time without disturbing the operation of the other mines in the field or causing sympathetically detonated reactions. Thus two problems (on face value) are prevalent when reliable operation of two mines in close proximity is to be considered. The first problem is sympathetic detonation. The second probl

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5

Schneider, Nathan A. "Prediction of surface ship response to severe underwater explosions using a virtual underwater shock environment." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FSchneider.pdf.

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Thesis (Mechanical Engineer and M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2003.<br>Thesis advisor(s): Young S. Shin. Includes bibliographical references (p. 161-162). Also available online.

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6

Ucar, Hakan. "Dynamic response of a catamaran-hull ship subjected to underwater explosions." Thesis, Monterey, Calif. : Naval Postgraduate School, 2006. http://bosun.nps.edu/uhtbin/hyperion.exe/06Dec%5FUcar.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 2006.<br>Thesis Advisor(s): Young S. Shin, Jarema M. Didoszak. "December 2006." Includes bibliographical references (p. 137-138). Also available in print.

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7

Hammond, Lloyd Charles 1961. "The structural response of submerged air-backed plates to underwater explosions." Monash University, Dept. of Civil Engineering, 2000. http://arrow.monash.edu.au/hdl/1959.1/9244.

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8

Fox, Padraic K. Kwon Young W. "The dynamic response of cylindrical shells subjected to side-on underwater explosions." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School; Available from the National Technical Information Service, 1993. http://handle.dtic.mil/100.2/252856.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer) Naval Postgraduate School, March 1992.<br>Thesis advisor, Young W. Kwon. Cover title: Nonlinear ... to underwater side-on explosions. AD-A252 856. Includes bibliographical references. Also available online.

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9

Fox, Padraic K., and Young W. Kwon. "The dynamic response of cylindrical shells subjected to side-on underwater explosions." Thesis, Monterey, California: Naval Postgraduate School, 1993. http://hdl.handle.net/10945/24152.

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10

Elder, David James, and d. elder@crc-acs com au. "Optimisation of parametric equations for shock transmission through surface ships from underwater explosions." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080212.105012.

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Currently shock effects on surface ships can be determined by full scale shock trials, Finite Element Analysis or semi empirical methods that reduce the analytical problem to a limited number of degrees of freedom and include hull configurations, construction methods and materials in an empirical way to determine any debilitating effects that an explosion may have on the ship. This research has been undertaken to better understand the effect of hull shape on surface ships' shock response to external underwater explosions (UNDEX). The study is within the semi empirical method category of comput

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11

Nassor, Alice. "Domain decomposition method for acoustic-elastic coupled problems in time-domain. Application to underwater explosions." Electronic Thesis or Diss., Institut polytechnique de Paris, 2023. http://www.theses.fr/2023IPPAE015.

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Ce travail étudie les approches globales en temps de décomposition de domaine pour résoudre des problèmes transitoires d'interaction fluide-structure. Afin de déterminer un algorithme optimal, nous étudions dans un premier temps la solvabilité des problèmes élastodynamiques et acoustiques transitoires avec des conditions aux frontières de type Robin et de Neumann. Nous énonçons des résultats de solvabilité, en soulignant les différentes régularités espace-temps des solutions. Nous étudions également la solvabilité du problème couplé élastodynamique-acoustique transitoire. Puis en nous basant s

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12

Didoszak, Jarema M. "Parametric studies of DDG-81 ship shock trial simulations." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Mar%5FDidoszak.pdf.

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13

Petrusa, Douglas C. "Evaluation and analysis of DDG-81 simulated athwartship shock response." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FPetrusa.pdf.

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14

Avachat, Siddharth. "Experimental and numerical analyses of dynamic deformation and failure in marine structures subjected to underwater impulsive loads." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/44904.

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The need to protect marine structures from the high-intensity impulsive loads created by underwater explosions has stimulated renewed interest in the mechanical response of sandwich structures. The objective of this combined numerical and experimental study is to analyze the dynamic response of composite sandwich structures and develop material-structure-property relations and design criteria for improving the blast-resistance of marine structures. Configurations analyzed include polymer foam core structures with planar geometries. A novel experimental facility to generate high-intensity under

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15

Smith, Paul R. "Underwater Explosion Energy Dissipation Near Waterborne Infrastructure." UKnowledge, 2016. http://uknowledge.uky.edu/ce_etds/35.

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Underwater explosions pose a significant threat to waterborne infrastructure though destructive pressure waves that can travel significant distances through the water. However, the use of bubble screens can attenuate the peak pressure and energy flux created by explosions to safe levels. This study investigates the prediction of pressure wave characteristics based on accumulated data, the damage potential of underwater explosions based on applied loads and effective material strength, and the bubble screen parameters required to prevent damage. The results were compiled to form a procedure for

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16

Miller, William Earl. "Simulation of the underwater nuclear explosion and its effects." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/24037.

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17

Matsumoto, Kazuhiro. "Boundary curvature effects on gas bubble oscillations in underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA308087.

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18

Oglesby, Douglas B. "Human male and female biodynamic response to underwater explosion events." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA350567.

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Thesis (Degree in Mechanical Engineer and M.S. in Mechanical Engineering) Naval Postgraduate School, June 1998.<br>Thesis advisor, Young S. Shin. "June 1998." Includes bibliographical references (p. 139-141). Also available online.

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19

Boticario, Luis A. "Dynamic response of cylindrical shells to underwater end-on explosion." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/28133.

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20

Cunningham, Richard E. "Simplified finite element modeling of stiffened cylinders subjected to underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA310376.

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21

Hooker, Donald T. "Effect of initial imperfections of the response of cylinders to underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA276428.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer) Naval Postgraduate School, December 1993.<br>Thesis advisor(s): Young S. Shin. "December 1993." Bibliography: p. 96. Also available online.

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22

Nelson, Kurt W. "Dynamic response and failure analysis of aluminum cylinders subjected to underwater explosion." Thesis, Monterey, California. Naval Postgraduate School, 1992. http://hdl.handle.net/10945/23645.

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Approved for public release; distribution is unlimited<br>An underwater explosion test was conducted on two closed aluminum cylinders to provide physical results from a dynamic collapse. Axial and side-on attack geometries were investigated in this study. Both cylinders displayed numerous fractures and significant plastic deformation. Finite element models of the cylinders were developed to aid in physical understanding of the dynamic response. Sensitivity analysis of the model parameters were conducted to determine the optimum modeling method. A computer model with failure prediction cap

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23

Mavaleix-Marchessoux, Damien. "Modelling the fluid-structure coupling caused by a far-field underwater explosion." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAE012.

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Les sous-marins militaires doivent résister aux sollicitations induites par une explosion sous-marine. Pour s'en assurer, la simulation numérique est d'une importance capitale, compte tenu du coût très élevé des campagnes expérimentales. Une explosion sous-marine lointaine est un événement complexe qui a deux effets distincts : elle libère une onde de choc, puis crée une bulle de gaz oscillante qui pousse une grande quantité d'eau plus lentement. Les deux phénomènes ont des caractéristiques et des échelles de temps assez différentes. Dans ce travail, nous supposons que l'explosion est suffisam

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24

Klenow, Bradley A. "Assesment of LS-DYNA and Underwater Shock Analysis (USA) Tools for Modeling Far-Field Underwater Explosion Effects on Ships." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/42786.

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<p>This thesis investigates the use of the numerical modeling tools LS-DYNA and USA in modeling general far-field underwater explosions (UNDEX) by modeling a three-dimensional box barge that is subjected to a far-field underwater explosion. Past UNDEX models using these tools have not been validated by experiment and most are limited to very specific problems because of the simplifying assumptions they make. USA is a boundary element code that requires only the structural model of the box barge. LS-DYNA is a dynamic finite element code and requires both the structural model and the surroundi

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25

Maines, Geoffrey C. "Underwater Pressure Pulses Generated by Mechanically Alloyed Intermolecular Composites." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30708.

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Recently, the use of thermite-based pressure waves for applications in cellular transfection and drug delivery have shown significant improvements over previous technologies. In the present study, a new technique for producing thermite-generated pressure pulses using fully-dense nano-scale thermite mixtures was evaluated. This was accomplished by evaluation of a stoichiometric mixture of aluminium (Al) and copper(II)-oxide (CuO) prepared by mechanical alloying. Flame propagation speeds, constant-volume pressure characteristics and underwater pressure characteristics of both a micron-scale and

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26

Mathew, Ajai Kurian. "Modeling Underwater Explosion (UNDEX) Shock Effects for Vulnerability Assessment in Early Stage Ship Design." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/82531.

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This thesis describes and assesses a simplified tool for modeling underwater explosion shock effects during early naval ship concept design. A simplified fluid model using Taylor flat-plate theory is incorporated directly into the OpenFSI module code in Nastran and used to interface with the structural solver in Nastran to simulate a far-field shockwave impacting the hull. The kick-off velocities and the shock spectra captured in this computationally efficient module is compared to results from a high-fidelity CASE (Cavitating Acoustic Spectral Element) fluid model implemented with the ABAQUS/

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27

Brainard, Benjamin Chase V. "An Underwater Explosion-Induced Ship Whipping Analysis Method for use in Early-Stage Ship Design." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/64508.

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This thesis presents an analysis method for determining the whipping response of a hull girder to underwater explosion (UNDEX) bubble pulse loading. A potential flow-based UNDEX bubble model capable of calculating the behavior of a migrating bubble for up to three pulses is developed. An approximate vertical plane ship vibration model is derived using fundamental beam theory by representing the ship as a free-free beam with varying cross-sectional properties along its length. The fluid-structure interaction is approximated using strip theory and the distant flow assumption. The most severe pre

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28

Wood, Steven L. "Cavitation effects on a ship-like box structure subjected to an underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA354937.

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Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 1998.<br>"September 1998." Thesis advisor(s): Young S. Shin. Includes bibliographical references (p. 115-116). Also Available online.

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29

Trevino, Theodore. "Applications of Arbitrary Lagrangian-Eulerian (ALE) analysis approach to underwater and air explosion problems." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384983.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, Sept. 2000.<br>Thesis advisor(s): YShin, Young S. "September 2000." Includes bibliographical references (p. 175-177). Also available in print.

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30

Lu, Zhaokuan. "Computationally-effective Modeling of Far-field Underwater Explosion for Early-stage Surface Ship Design." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/104996.

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The vulnerability of a ship to the impact of underwater explosions (UNDEX) and how to incorporate this factor into early-stage ship design is an important aspect in the ship survivability study. In this dissertation, attention is focused on the cost-efficient simulation of the ship response to a far-field UNDEX which involves fluid shock waves, cavitation, and fluid-structural interaction. Traditional fluid numerical simulation approaches using the Finite Element Method to track wave propagation and cavitation requires a high-level of mesh refinement to prevent numerical dispersion from discon

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31

Klenow, Bradley. "Finite and Spectral Element Methods for Modeling Far-Field Underwater Explosion Effects on Ships." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/37648.

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The far-field underwater explosion (UNDEX) problem is a complicated problem dominated by two phenomena: the shock wave traveling through the fluid and the cavitation in the fluid. Both of these phenomena have a significant effect on the loading of ship structures subjected to UNDEX. An approach to numerically modeling these effects in the fluid and coupling to a structural model is using cavitating acoustic finite elements (CAFE) and more recently cavitating acoustic spectral elements (CASE). The use of spectral elements in CASE has shown to offer the greater accuracy and reduced computationa

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32

Santiago, Leonard D. "Fluid-interaction and cavitation effects on a surface ship model due to an underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA320830.

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33

Beiter, Keith A. "The effect of stiffener smearing in a ship-like box structure subjected to an underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA353271.

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34

Kaufman, Robert E. "Effects of geometric and material imperfections on the dynamic response of cylindrical shells subjected to underwater explosion." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1995. http://handle.dtic.mil/100.2/ADA299939.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer) Naval Postgraduate School, June 1995.<br>Thesis advisor(s): Young S. Shin. "June 1995." Bibliography: p. 101-102. Also available online.

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35

Hawkins, Darrin L. Van Leuvan Barbara C. "An XML-based mission command language for autonomous underwater vehicles (AUVs) /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FHawkins.pdf.

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36

Oesterreich, Mark H. "Transient response analysis of the 72 Inch TAC-4 ruggedized shipboard rack subjected to an underwater explosion event." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1998. http://handle.dtic.mil/100.2/ADA354298.

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Thesis (Degree of Mechanical Engineer and M.S. in Mechanical Engineering) Naval Postgraduate School, June 1998.<br>"June 1998." Thesis advisor(s): Young S. Shin. Includes bibliographical references (p. 97). Also available online.

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37

Stettler, Jeffrey W. "Damping mechanisms and their effects on the whipping response of a submerged submarine subjected to an underwater explosion." Thesis, Monterey, California. Naval Postgraduate School, 1995. http://hdl.handle.net/10945/25799.

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38

Stettler, Jeffrey W. (Jeffrey Wayne). "Damping mechanisms and their effects on the whipping response of a submerged submarine subjected to an underwater explosion." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11085.

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Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.<br>Includes bibliographical references (leaves 102-107).<br>by Jeffrey W. Stettler.<br>M.S.<br>Nav.E.

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39

Nusom, F. Allen. "Application of the systems engineering process to the explosive ordnance disposal requirement for an underwater system." Master's thesis, This resource online, 1990. http://scholar.lib.vt.edu/theses/available/etd-12232009-020010/.

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40

Smith, James R. "Effect of fluid mesh truncation on the response of a Floating Shock Platform (FSP) subjected to an Underwater Explosion (UNDEX)." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA371731.

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Thesis (M.S. in Mechanical Engineering) Naval Postgraduate School, September 1999.<br>"September 1999:. Thesis advisor(s): Young S. Shin. Includes bibliographical references (p. 71-72). Also Available online.

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41

Park, Jinwon. "A Runge Kutta Discontinuous Galerkin-Direct Ghost Fluid (RKDG-DGF) Method to Near-field Early-time Underwater Explosion (UNDEX) Simulations." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28905.

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A coupled solution approach is presented for numerically simulating a near-field underwater explosion (UNDEX). An UNDEX consists of a complicated sequence of events over a wide range of time scales. Due to the complex physics, separate simulations for near/far-field and early/late-time are common in practice. This work focuses on near-field early-time UNDEX simulations. Using the assumption of compressible, inviscid and adiabatic flow, the fluid flow is governed by a set of Euler fluid equations. In practical simulations, we often encounter computational difficulties that include large displa

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42

Webster, Keith Gordon. "Investigation of Close Proximity Underwater Explosion Effects on a Ship-Like Structure Using the Multi-Material Arbitrary Lagrangian Eulerian Finite Element Method." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/31077.

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This thesis investigates the characteristics of a close proximity underwater explosion and its effect on a ship-like structure. Finite element model tests are conducted to verify and validate the propagation of a pressure wave generated by an underwater explosion through a fluid medium, and the transmission of the pressure wave in the fluid to a structure using the Multi-Material Arbitrary Lagrangian/Eulerian method. A one dimensional case modeling the detonation of a spherical TNT charge underwater is investigated. Three dimensional cases modeling the detonation of an underwater spherical

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43

Brochard, Kévin. "Modélisation analytique de la réponse d’un cylindre immergé à une explosion sous-marine." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0019/document.

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La conception d’une coque de sous-marin est cruciale pour son opérabilité et la sécurité de l’équipage, mais également complexe. En effet, les ingénieurs doivent prendre en compte à la fois la légèreté, la discrétion acoustique et la résistance de la coque à la pression d’immersion et aux attaques extérieures. Les explosions sous-marines représentent une menace de premier ordre pour l’intégrité de la coque, dont le comportement doit être correctement analysé. Les travaux présentés dans cette thèse portent sur le développement d’une méthode simplifiée, basée sur des formulations analytiques, po

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Van, Leuvan Barbara C., and Darrin L. Hawkins. "An XML-based mission command language for autonomous underwater vehicles (AUVs)." Thesis, Monterey, California. Naval Postgraduate School, 2003. http://hdl.handle.net/10945/975.

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Approved for public release, distribution is unlimited<br>Autonomous Underwater Vehicles (AUVs) are now being introduced into the fleet to improve Mine Warfare capabilities. Several AUVs are under government-contracted development. Mission planning and data reporting vary between vehicles and systems. This variance does not pose an immediate problem, as only one AUV is currently in production. However, as more AUVs are put into production, commands will begin to get multiple AUVs. Without a single mission command language, multiple systems will require familiarity with multiple languages. Exte

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Phaneuf, Matthew D. "Experiments with the REMUS AUV." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FPhaneuf.pdf.

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46

Tartière, Jérémie. "Prediction of deformation and residual stress in the high explosive hydroforming process using numerical simulation." Electronic Thesis or Diss., Brest, École nationale supérieure de techniques avancées Bretagne, 2022. http://www.theses.fr/2022ENTA0008.

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Avant la pandémie de COVID-19, Airbus recevait de plus en plus de commandes d'aéronefs, et espérait, via l’hydroformage par explosif, pouvoir répondre à davantage de demandes. Pour éviter des coûts supplémentaires pour le développement d’une nouvelle technique, la simulation numérique est utilisée. Toutefois, le temps nécessaire, que ce soit de calcul ou ingénieur, est trop important et la précision parfois insuffisante pour permettre une intégration facile au sein des différents projets concernés. De plus, la viabilité du procédé en vue d’une industrialisation doit être considérée. Pour répon

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47

Nico, Thibaut. "Étude et développement de solutions de relocalisation d'objets sous-marins par des véhicules sous-marins hétérogènes." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2019. http://www.theses.fr/2019ENTA0005.

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Dans le contexte de guerre des mines (MCM), il est important de revisiter les objets potentiellement dangereux afin de les identifier et les neutraliser s’il s’agit effectivement de mines. Cette dangereuse tâche était habituellement réalisée par des plongeurs démineurs qui sont petit à petit remplacés par des drones sous-marins. Le design « low cost » des robots de revisite/destruction de mines ne permet en général pas de garantir la revisite d’une cible géolocalisée en allant droit dessus. De plus, le robot pourrait commencer sa mission sous-marine à une distance éloignée et l’absence de posi

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Elbergui, Ayda. "Amélioration des techniques de reconnaissance automatique de mines marines par analyse de l'écho à partir d'images sonar haute résolution." Thesis, Brest, 2013. http://www.theses.fr/2013BRES0042/document.

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La classification des cibles sous-marines est principalement basée sur l'analyse de l'ombre acoustique. La nouvelle génération des sonars d'imagerie fournit une description plus précise de la rétrodiffusion de l'onde acoustique par les cibles. Par conséquent, la combinaison de l'analyse de l'ombre et de l'écho est une voie prometteuse pour améliorer la classification automatique des cibles. Quelques systèmes performants de classification automatique des cibles s'appuient sur un modèle pour faire l'apprentissage au lieu d'utiliser uniquement des réponses expérimentales ou simulées de cibles pou

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CHEN, BO-GAO, and 陳柏高. "GRP Surface Ship Subjected to Underwater Explosions." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/qn7qgn.

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碩士<br>國立高雄科技大學<br>造船及海洋工程系<br>107<br>The anti-shocking capability of the ship is one of the important conditions to suit the mission. This paper takes the reaction of the GRP monocoque (frameless) construction ship under the underwater explosion as the research object. First using MSC.Dytran to establish a simulation model of TNT in underwater explosions, verify the relevant parameters settings; then establish ship model, analyze its response of various parts under underwater explosion, and use Tsai-Wu damage criterion to check material’s failure. The result of the underwater explosion simulat

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H, Liu T., and 劉子豪. "A Study of the Effects of Underwater Explosions." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/28194276205298377471.

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碩士<br>大葉大學<br>機械工程研究所碩士班<br>92<br>The detonation of a condensed high explosive underwater produces two pressure pluses which is a shock then followed by a bubble pulse associated with the expansion of the products of detonation. The purpose of this paper is largely the result of published research on underwater explosions carried out by past literatures such as Roop(1943), Cole(1948), Aron(1949), Keil(1961), Smith(1994) and M kinen(1998). Much of the present knowledge and understanding of this field was acquired became of the demands and the few available discussions of the subject have become

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