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dc.contributor.authorCohen, Jay Martin
dc.date.accessioned2006-09-15T19:50:18Z
dc.date.available2006-09-15T19:50:18Z
dc.date.issued1972-06
dc.identifier.urihttp://hdl.handle.net/1912/1224
dc.descriptionSubmitted 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, 1972en
dc.description.abstractSubmerged 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.sponsorshipPrepared for the Office of Navai Research under Contract N00014-71-C-0107; NR 265-107.en
dc.format.extent13323934 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherWoods Hole Oceanographic Institutionen
dc.relation.ispartofseriesWHOI Technical Reportsen
dc.relation.ispartofseriesWHOI-72-45en
dc.relation.ispartofseriesWHOI Thesesen
dc.subjectSubmerged recoveryen
dc.subjectTethered cradle responseen
dc.subjectShip-Seaway interactionen
dc.titleAn experimental analysis of the dynamics of a submerged tethered cradle in a seawayen
dc.typeTechnical Reporten
dc.typeThesisen
dc.identifier.doi10.1575/1912/1224


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