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1	Evaluation and analysis of DDG-81 simulated athwartship shock response Petrusa, Douglas C. 06 1900 (has links) Approved for public release; distribution is unlimited / In 2001 the USS WINSTON CHURCHILL (DDG-81) was subjected to three underwater explosions as part of a ship shock trial. Using the actual trial data from experiment and three-dimensional dynamic models of the ship and surrounding fluid very successful comparisons of the vertical motion have been achieved. On average, the magnitude of the vertical motion is three to four times the magnitude of athwartship motion. Previous simulations of this athwartship motion have been less accurate than the vertical motion simulations. This thesis examines recent efforts attempted to improve the simulation results of the athwartship motion including shock spectra analysis, and the reasons behind the disparities that exist between the simulated values and the actual trial data. / Lieutenant, United States Coast Guard Underwater explosions Simulation methods Shock (Mechanics) Measurement Vibration Underwater explosion UNDEX Modeling and simulation Shock and vibration Ship shock Athwartship shock response Shock spectra USS Winston S. Churchill DDG-81
2	Parametric studies of DDG-81 ship shock trial simulations Didoszak, Jarema M. 03 1900 (has links) Approved for public release, distribution is unlimited / Evaluations, otherwise known as ship shock trials, have been conducted in order to determine the seaworthiness of each new class of ship commissioned in the U.S. Fleet. While beneficial in determining the overall survivability of a ship and its mission essential equipment in a severe shock environment, these Navy-mandated tests pose serious danger to the crew, ship and environment. As an alternative to these labor intensive, costly and time consuming at-sea tests, the recent advances in computer processing power have made it possible to employ finite element methods involving complex geometries in the modeling and simulation of shock response for the ship and surrounding fluid. This thesis examines the accuracy of shock simulation predictions as compared to the ship shock trials conducted on USS WINSTON S. CHURCHILL (DDG-81). An investigation of the effects of sensor location, damping and shot geometry is presented as validation of the Naval Postgraduate School modeling and simulation methodology. / Lieutenant, United States Navy Underwater explosions Computer simulation Mechanical engineering Astronautics Underwater explosion UNDEX Modeling and simulation Shock and vibration Ship shock Shock response Underwater shock analysis Dynamic shock simulation Computer simulation USS Winston S. Churchill DDG-81

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Evaluation and analysis of DDG-81 simulated athwartship shock response

Parametric studies of DDG-81 ship shock trial simulations