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

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Authors
Kearns, Sean D.
Subjects
Advisors
Date of Issue
2001-09
Date
Sept 2001
Publisher
Monterey California. Naval Postgraduate School
Language
en_US
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 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.
Type
Thesis
Description
CIVINS (Civilian Institutions) Thesis document
Department
Mechanical Engineering
Identifiers
NPS Report Number
Sponsors
Funder
CIVINS
Format
148 leaves : ill. ; 28 cm.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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