NDLI: Designing implodable underwater systems to minimize implosion pulse severity

Content Provider	IEEE Xplore Digital Library
Author	Gish, L. A.
Copyright Year	2015
Description	Author affiliation: Department of Naval Architecture and Ocean Engineering, United States Naval Academy, Annapolis, MD, United States of America (Gish, L. A.)
Abstract	Underwater implosion is the rapid and catastrophic collapse of a pressure vessel subjected to external pressure, resulting in a very short but high-pressure pulse in the surrounding water that can potentially damage adjacent structures or personnel. Any system with an internal pressure below external pressure is susceptible to implosion. The pressure pulse from a single implosion has been known to trigger subsequent sympathetic implosions. This work investigates methods of reducing the implosion pulse severity for unstiffened metallic cylindrical pressure vessels. The implosion pulse energy is proportional to the maximum system kinetic energy developed during collapse. It can be reduced by (1) increasing the plastic energy dissipated by the collapsing structure, or (2) increasing the energy required to compress the internal gas. Plastic energy dissipation is increased by triggering higher buckling modes through introduction of geometric imperfections. Numerical simulations show that this technique can reduce implosion pulse energy for a sample cylinder by up to 33%, while reducing the buckling strength of the cylinder by only 0.5%. The energy required for gas compression can be increased by initially pressurizing the interior of the implodable. The benefit from this technique is bounded by other limitations on internal pressure, such as equipment and human survivability. A slight increase in gas compression energy is also realized by substituting a noble gas for air. These techniques can be applied, singly or in combination, to any implodable design to significantly reduce the pulse severity and minimize the risk of sympathetic implosions.
Starting Page	1
Ending Page	7
File Size	2557560
Page Count	7
File Format	PDF
ISBN	9780933957435
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Energy dissipation Plastics Shape Numerical simulation Kinetic energy Underwater vehicles Numerical models Sympathetic implosion Implosion Cylindrical shell Fluid-structure interaction Pressure pulse
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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