Author: David T. Hart
Publisher:
Published: 2003-03-01
Total Pages: 111
ISBN-13: 9781423503651
DOWNLOAD EBOOK →The USS Winston S. Churchill (DDG-81) shock trial was conducted in May and June of 2001 off the coast of Naval Station Mayport, Florida. Because the USS Winston S. Churchill best represented the new line of Flight 11-A arleigh Burkes, it was chosen to undergo ship shock trials for its class. These trials are necessary in order to evaluate the vulnerability and survivability of the hull and the mission essential equipment in a combat shock environment. However, shock trials are very expensive, require extensive planning and coordination, and represent a potential hazard to the marine environment and its mammals. Computer modeling and simulation are showing themselves to be a plausible alternative in investigating the dynamic response of a ship under these shock trials conditions. This thesis investigates the use of computer ship and fluid modeling, coupled with underwater explosion simulation and compares it to actual shock trial data from the USS Winston S. Churchill. Of particular concern in this study is the amount of fluid that must be modeled to accurately capture the structural response of a frill ship finite element model. Four fluid meshes were constructed and used to study the ship's response to an underwater explosion. Each simulation data was analyzed to determine which mesh best represented the actual ship shock trial results.
Author: Nathan A. Schneider
Publisher:
Published: 2003-09-01
Total Pages: 187
ISBN-13: 9781423513148
DOWNLOAD EBOOK →During World War II many surface combatants were damaged or severely crippled by close-proximity underwater explosions from ordnance that had actually missed their target. Since this time all new classes of combatants have been required to conduct shock trial tests on the lead ship of the class in order to test the survivability of mission essential equipment in a severe shock environment. 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 on board, 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. The research summarized in this report investigated the accuracy of shock simulation using the shock trials conducted on USS WINSTON S. CHURCHILL (DDG 81) in 2001. All three explosions DDG 81 was subjected to are simulated and the resulting predictions compared with actual shock trial data. The effects of fluid volume size, mesh density, mesh quality, and shot location are investigated.
Author: Elena McCarthy
Publisher: Springer Science & Business Media
Published: 2007-05-08
Total Pages: 295
ISBN-13: 1402080786
DOWNLOAD EBOOK →Numerous incidents suggest that man-made sound injures and can kill marine mammals. This book offers an objective look at how ocean noise should be addressed given the lack of regulatory structure and the scientific uncertainty over the effects of noise on marine life. It is an essential text for policymakers, governments and NGOs, biologists, environmental activists, , oceanographers, and those in the shipping, engineering, and offshore oil and gas industries.
Author: United States. Marine Mammal Commission
Publisher:
Published: 1999
Total Pages: 270
ISBN-13:
DOWNLOAD EBOOK →Author: United States. Marine Mammal Commission
Publisher:
Published: 1998
Total Pages: 540
ISBN-13:
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