The Response of Surface Ships to Underwater Explosions PDF Download
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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:
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: 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: 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: Otto Hill
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages : 92
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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: Waterways Experiment Station (U.S.)
Publisher:
ISBN:
Category : Nuclear warfare
Languages : en
Pages : 142
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Book Description
Author: Y. S. Shin
Publisher:
ISBN:
Category : Hydrodynamics
Languages : en
Pages :
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Book Description
Author: Keith A. Beiter
Publisher:
ISBN: 9781423558675
Category :
Languages : en
Pages : 69
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Book Description
Shock trials for naval vessels are a requirement for each new class of surface ships in the U.S. Navy. With understanding the technology of underwater shock analysis and considering the rising costs of conducting actual shock tests, computer simulation of shock trials is becoming more and more attractive. Unfortunately, finite element models can be quite large and require sufficient amounts of computer memory and time to run a shock analysis. This thesis investigates the effects of reducing the element size of a ship-like box model subjected to an underwater explosion. Known as smearing, this process combines the density and stiffness properties of the removed elements into the remaining material of the model. Positive results from computer simulation could greatly affect the manner in which shock trials are conducted with future ship classes.
