International Journal of Innovative Research and Development

I. N. Niranjan Kumar , Nagesh Bhadriraju

Abstract

A new innovationin the world of multi-hull vessels has been proposed, by arranging the fourspindlesubmarine typeofhulls(A QUADRAMARAN)forhigherstabilizationandintroducingnewstructuralsynthesis phenomenonwhichisacompletedeviationfromexistingclassificationsocietyapproachesonstructuraldesign.Astructuralsynthesisapproach/methodroutinelyusedtodesign&buildinternallypressurizedfilamentaryvesselsismodifiedforapplicationontoaradicallydifferentdesignofexternallypressurizedsteelhulls.Inthedesignprocessbeginningwithshellequilibrium,choosinggeodesicsasreinforcementdirections,usingNettingtheoryandintegratingresultingODEs,wearriveatasolutionasdemandedoptimumshaperatherthananalyzingpre-determinedshapesofhullbodyplan.Thatazerohoopstresscaseofdoublycurvedrotationallysymmetricpressureshellsissameincompositeandmetallicdesign,thisapproachisadoptedforsteel.Thisconsiderationhasleadtoacorrugated/bellow/unduloidshape,morepointedontheoutsidethantheinside.Veryrigidstructureresultedasexpectedthroughthecompositeroute.FEanalysisprovesstrengthandstabilityoftheresultingform.

A new innovationin the world of multi-hull vessels has been proposed, by arranging the fourspindlesubmarine typeofhulls(A QUADRAMARAN)forhigherstabilizationandintroducingnewstructuralsynthesis phenomenonwhichisacompletedeviationfromexistingclassificationsocietyapproachesonstructuraldesign.Astructuralsynthesisapproach/methodroutinelyusedtodesign&buildinternallypressurizedfilamentaryvesselsismodifiedforapplicationontoaradicallydifferentdesignofexternallypressurizedsteelhulls.Inthedesignprocessbeginningwithshellequilibrium,choosinggeodesicsasreinforcementdirections,usingNettingtheoryandintegratingresultingODEs,wearriveatasolutionasdemandedoptimumshaperatherthananalyzingpre-determinedshapesofhullbodyplan.Thatazerohoopstresscaseofdoublycurvedrotationallysymmetricpressureshellsissameincompositeandmetallicdesign,thisapproachisadoptedforsteel.Thisconsiderationhasleadtoacorrugated/bellow/unduloidshape,morepointedontheoutsidethantheinside.Veryrigidstructureresultedasexpectedthroughthecompositeroute.FEanalysisprovesstrengthandstabilityoftheresultingform.

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Lakshmi Narasimham Gudipaty , Nagesh Bhadriraju

Abstract

A new innovation in the world of multi-hull vessels has been proposed, by arranging the four spindle submarine type of hulls (A QUADRAMARAN) for higher stabilization and introducing new structural synthesis phenomenon which is a complete deviation from existing classification society approaches on structural design. A structural synthesis approach/method routinely used to design & build internally pressurized filamentary vessels is modified for application onto a radically different design of externally pressurized steel hulls. In the design process beginning with shell equilibrium, choosing geodesics as reinforcement directions, using Netting theory and integrating resulting ODEs, we arrive at a solution as demanded optimum shape rather than analyzing pre-determined shapes of hull body plan. That a zero hoop stress case of doubly curved rotationally symmetric pressure shells is same in composite and metallic design, this approach is adopted for steel. This consideration has lead to a corrugated/bellow/unduloid shape, more pointed on the outside than the inside. Very rigid structure resulted as expected through the composite route. FE analysis proves strength and stability of the resulting form.

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Anil Raj , Nagesh Bhadriraju

Abstract

Technology Associates, Inc (TAI), a New Orleans, USA based Naval Architecture firm with offices also in Vishakhapatnam, India introduced its Technology EnviroMax 300 ™© Deep water Oil and Gas Support Vessel(OSV) in 2010. As Oil and Gas exploration has gone to deeper waters, reaching depths up to 4,000 meters, the designs of OSVs has changed to suit the more challenging requirement. Several development had a goal to minimize the environmental impact from the vessel during construction and operations, minimize life cycle costs, while maximizing the dead weight, the cargo delivered to site per year, and operational flexibility. These were diametrically opposite and challenging requirements which had to be balanced to create a design which has a goal to be competitive to build and operate, and yet had maximum capacities and speed. The development resulted in a design which has one of the known industry's highest usable cargo volume to cubic number ratio, and the highest deadweight per cargo volume ratio in vessels of its class. It also has a higher maximum speed than most vessel designs in its class, using optimally installed propulsion KW. Since the introduction of the fist of Technology EnviroMax 300 ™© series, TAI has introduced a Technology EnviroMax 315 ™© a Technology EnviroMax 275 ™©, a Technology EnviroMax 195 ™© and Technology EnviroMax 300 Gen II ™©. All of these designs have been contracted by clients and most of them are either under construction or in final stages of design.

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