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Analysis and mitigation of mechanical shock effects on high speed planing boats

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dc.contributor.advisor J. Kim Vandiver. en_US Kearns, Sean D. (Sean David), 1968- en_US
dc.contributor.other Massachusetts Institute of Technology. Dept. of Ocean Engineering. en_US 2005-08-23T18:30:55Z 2005-08-23T18:30:55Z 2001 en_US 2001 en_US
dc.description Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2001. en_US
dc.description Includes bibliographical references (p. 90-92). en_US
dc.description.abstract United States Special Forces use high-speed planing boats in the performance of their missions. Operation of these boats, particularly in rough seas, exposes the occupants to severe mechanical shock exposure that has been linked to significant increase in the rates of acute and chronic injury. While many government and civilian organizations have researched various aspects of this problem over the past decade or more, no effective solution has yet been implemented in the fleet. In response to this problem, the Commander Naval Special Warfare Command in San Diego, CA forwarded a request to MIT's Ocean Engineering Department calling for a study of the problem. The object of this thesis is to conduct a comprehensive analysis of the problem, to research methods by which the problem can be mitigated, and to develop and validate a method for laboratory design, test, and evaluation, of shock mitigation systems. First, a theoretical and empirical study is conducted of the hydrodynamic interaction between a boat's hull and the seaway, and how this interaction results in the generation of mechanical shock. Actual acceleration data is obtained from the boats while underway in typical operating conditions, and other similar data is obtained from previous studies. Second, the mechanisms by which exposure to mechanical shock and vibration causes acute and chronic injury are investigated. Past human and animal testing is reviewed, along with information on the transmissibility and mechanical impedance of the human body. Information of this type, along with other injury data compilation studies, have contributed to existing injury prediction. Third, a study and is made of the methods by which mechanical shock exposure on high-speed boats can be mitigated. Interfaces (e.g.- hull-seaway) are identified where shock mitigation can be achieved, and existing or conceptual shock mitigation systems are discussed. Additionally, operational methods (such as training) of reducing shock exposure effects are discussed. Finally, a laboratory drop table apparatus is fabricated for use in the design, test and evaluation of shock mitigation systems. This test apparatus is validated by successful reproduction of shock events such as those experienced on high-speed boats, as well as by excellent repeatability and controllability. en_US
dc.description.statementofresponsibility by Sean D. Kearns. en_US
dc.format.extent 148 p. en_US
dc.format.extent 11577772 bytes
dc.format.extent 11577532 bytes
dc.format.mimetype application/pdf
dc.format.mimetype application/pdf
dc.language.iso eng en_US
dc.publisher Massachusetts Institute of Technology en_US
dc.rights M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. en_US
dc.subject Ocean Engineering. en_US
dc.title Analysis and mitigation of mechanical shock effects on high speed planing boats en_US
dc.title.alternative Mechanical shock effects on high speed planing boats en_US
dc.type Thesis en_US S.M. en_US
dc.contributor.department Massachusetts Institute of Technology. Dept. of Ocean Engineering. en_US
dc.identifier.oclc 50200001 en_US

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