The Response of Ships to Underwater Explosions PDF Download
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Author: A. H. Keil
Publisher:
ISBN:
Category : Explosions
Languages : en
Pages : 34
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Book Description
Various phases of an underwater explosion are described. Nomograms are given for characteristics parameters of the shock wave and the bubble pulsation. Possible effects of the water surface and the sea bottom are discussed. Characteristic ship-response phases are reviewed and explained. They are demonstrated by actual examples of hull response and hull damage. The shipboard shock environment to which any installation aboard a ship is subjected is presented, and typical cases of shock damage are shown. The significance of the study of ship response to underwater explosions is reviewed. Generalization of the few controlled explosion tests against ships becomes possible by application to loading and response theories. The foundation is thus laid for increasing the combat reliability of ships and their endurance under attack.
Author: A. H. Keil
Publisher:
ISBN:
Category : Explosions
Languages : en
Pages : 34
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Book Description
Various phases of an underwater explosion are described. Nomograms are given for characteristics parameters of the shock wave and the bubble pulsation. Possible effects of the water surface and the sea bottom are discussed. Characteristic ship-response phases are reviewed and explained. They are demonstrated by actual examples of hull response and hull damage. The shipboard shock environment to which any installation aboard a ship is subjected is presented, and typical cases of shock damage are shown. The significance of the study of ship response to underwater explosions is reviewed. Generalization of the few controlled explosion tests against ships becomes possible by application to loading and response theories. The foundation is thus laid for increasing the combat reliability of ships and their endurance under attack.
Author:
Publisher:
ISBN:
Category : Blast effect
Languages : en
Pages : 38
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Book Description
This report is a summary of technical information gathered by the author during an attachment to the Underwater Explosions Research Department (UERD) of the Naval Surface Warfare Center (NSWC) Carderock Division from April 1993 to July 1994. The report covers aspects of UERD's work in the area of: ship shock trials, response of surface ships to underwater explosions, computer modelling of surface ship responses and other technical information culled from the general literature.
Author: Robert Smilowitz
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 12
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Book Description
Author: Nathan A. Schneider
Publisher:
ISBN: 9781423501206
Category :
Languages : en
Pages : 184
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Book Description
During World War II many surface combatants were severely crippled by close-proximity underwater explosions from ordnance that had actually missed their target. Since this time, in order to test the survivability of mission essential equipment in a severe shock environment, all new classes of combatants have been required to have shock trial tests conducted on the lead ship of the class. While these tests are extremely important in determining the vulnerabilities of a surface ship, they require an extensive amount of preparation, manhours, and money. Furthermore, these tests present an obvious danger to the crew onboard, the ship itself and any marine life in the vicinity. Creating a virtual shock environment by use of a computer to model the ship structure and the surrounding fluid presents a valuable design tool and an attractive alternative to these tests. This thesis examines the accuracy of shock simulation using the shock trials conducted on USS WINSTON S. CHURCHILL (DDG 81) in 2001. Specifically, all three explosions DDG 81 was subjected to are simulated and the resulting predictions compared with actual shock trial data. The effects of the fluid volume size, mesh density, mesh quality, and shot location are investigated.
Author: Hakan Ucar
Publisher:
ISBN:
Category : Mechanical engineering
Languages : en
Pages : 158
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Book Description
Surface Ship Shock trials play an essential role in ship test and evaluation (T & E), and Live Fire Test and Evaluation (LFT & E) requirements for the lead ship of each new construction shock-hardened ship class. While those trials are necessary in order to evaluate the vunerability and survivability of the ship, they are very expensive, require extensive time for planing and coordination, and pose serious danger to the crew, ship and marine environment. Thus, computer modeling of the ship structure, surrounding fluid, and virtual shock environment by utilizing finite element method offers a valuable design tool and an alternative to these tests. This thesis investigates the response of a catamaran-hull ship subjected to an underwater explosion by creating a virtual UNDEX environment based on the modeling and simulation methodology established by the Shock and Vibration Computational Laboratory at the Naval Postgraduate School (NPS). In previous works, all of the structural models were monohull ships and there have been concerns about the feasibility of creating the coupled fluid and catamaran-hull model. This thesis studies the effect of an additional hull and gap between two hulls on the dynamic response of the ship as well as the effect of the charge location.
Author: Adrian P. Mouritz
Publisher: Woodhead Publishing
ISBN: 0081020937
Category : Technology & Engineering
Languages : en
Pages : 434
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Book Description
Explosion Blast Response of Composites contains key information on the effects of explosions, shock waves, and detonation products (e.g. fragments, shrapnel) on the deformation and damage to composites. The book considers the blast response of laminates and sandwich composites, along with blast mitigation of composites (including coating systems and energy absorbing materials). Broken down under the following key themes: Introduction to explosive blast response of composites, Air explosion blast response of composites, Underwater explosion blast response of composites, and High strain rate and dynamic properties of composites, the book deals with an important and contemporary topic due to the extensive use of composites in applications where explosive blasts are an ever-present threat, such as military aircraft, armoured vehicles, naval ships and submarines, body armour, and other defense applications. In addition, the growing use of IEDs and other types of bombs used by terrorists to attack civilian and military targets highlights the need for this book. Many terrorist attacks occur in subways, trains, buses, aircraft, buildings, and other civil infrastructure made of composite materials. Designers, engineers and terrorist experts need the essential information to protect civilians, military personnel, and assets from explosive blasts. Focuses on key aspects, including both modeling, analysis, and experimental work Written by leading international experts from academia, defense agencies, and other organizations Timely book due to the extensive use of composites in areas where explosive blasts are an ever-present threat in military applications
Author: Otto Hill
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 92
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Book Description
Author: Y. S. Shin
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages :
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Book Description
Author: Robert Hugh Cole
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 480
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Book Description
Author: W. W. Webbon
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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Book Description
This interim report summarizes results obtained in conjunction with continuing work toward extension of the Navy's Dynamic Design Analysis Method (DDAM) to multiple foundation motion. A dynamic model of a hull section containing simulated internal equipment with two supports was analyzed using the Variable Geometry Submarine Model (VGSM) for response to underwater explosions with varying charge standoffs. Charge weights were also varied such that the shock factor component normal to the hull was maintained constant for each standoff. Both symmetric and unsymmetric charge geometries with respect to the simulated equipment were examined. Results show that there is a trend toward reduced severity of shock predicted by this simulation for this equipment is the standoff is increased for constant shock factor. The unsymmetric loading resulting in different foundation motions of the two equipment supports shows a trend toward reduced severity of shock for many locations when the foundation motions are uncorrelated (small standoff). However, some locations, particularly those excited by unsymmetric modes of vibration, experience a significant increase in severity. As the unsymmetric charge geometry becomes more approximately symmetric for larger standoffs, the foundation motions become more correlated and the shock response approaches the symmetric case.
