An experimental analysis of the dynamics of a submerged tethered cradle in a seaway


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dc.contributor.author Cohen, Jay Martin
dc.date.accessioned 2006-09-15T19:50:18Z
dc.date.available 2006-09-15T19:50:18Z
dc.date.issued 1972-06
dc.identifier.uri http://hdl.handle.net/1912/1224
dc.description Submitted in partial fulfillment of the requirements for the degree of Ocean Engineer at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution and Master of Science in Naval Architecture and Marine Engineering at the Massachusetts Institute of Technology May, 1972 en
dc.description.abstract Submerged recovery of small submersibles by means of surface tethered platforms offers the possibility of operations in sea states higher than is now possible using surface recovery means. The Woods Hole Oceanographic Institution's submersible support catamaran LULU has such a tethered system. The system consisting of cradle, chains, and hoist is designed to recover DSRV ALVIN at a depth of 100 feet, and then lift the submersible rapidly through the air-sea interface. Scientific commitments as well as possible damage to the cradle and/or ALVIN, and danger to personnel have prevented full scale recovery experiments. A 1/40 scale model of the catamaran, chain and cradle was constructed to investigate cradle heave and pitch response in regular sinusoidal waves. Model tests were conducted at the Massachusetts Institute of Technology Tow Tank Facility and data was recorded electronically and photographically. Test runs were made at various ship speeds, cradle depths, wave heights, wave lengths, and cradle suspension modifications. Results indicate that for the existing system, cradle pitch and heave is only slightly attenuated over catamaran response at speeds less then 3 knots (full scale). By decreasing the number of cradle suspension points, and varying hoist resiliency and cradle added mass characteristics, cradle motion can be substantially reduced over catamaran motion. en
dc.description.sponsorship Prepared for the Office of Navai Research under Contract N00014-71-C-0107; NR 265-107. en
dc.format.extent 13323934 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Woods Hole Oceanographic Institution en
dc.relation.ispartofseries WHOI Technical Reports en
dc.relation.ispartofseries WHOI-72-45 en
dc.relation.ispartofseries WHOI Theses en
dc.subject Submerged recovery en
dc.subject Tethered cradle response en
dc.subject Ship-Seaway interaction en
dc.title An experimental analysis of the dynamics of a submerged tethered cradle in a seaway en
dc.type Technical Report en
dc.type Thesis en
dc.identifier.doi 10.1575/1912/1224

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