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1、6Lection1(23.11.2011,Wednesday)Introduction.Theshiptheoryconcept.Shipco-ordinatesystem.Vesselrequirements.Classificationsocieties.Shipbodyplan(linesplan).Shipprincipaldimensions.IntroductionAcruderepresentationoftheprocessofcreatingashipisoutlinedinthefigu
2、re:Fordeterminationofshiphullformgeometryandpositionoftheshipwithrespecttothesurfaceofthewater,theleft-handco-ordinatesystem,rigidlylinkedwiththeship,isused.Anoriginofthisco-ordinatesystem,thepointo,isplaceduponkeellineinthepointofintersectionofthebaseplan
3、e,theplaneofmeantransversesectionoftheshipbodyandtheplaneofitslongitudinalsymmetry.Theaxisoxispointedforward,beingbylineofintersectionofthecentreplaneandthebaseplane.Theaxisoyislineofintersectionofthemidstationplaneandthebaseplane;itspositivedirectionisthe
4、directiontotherightsideoftheship.Theaxisozislineofintersectionofthemidstationplaneandthecentreplane,thepositivedirectionofthisaxispointingupward.Thus,theplanexoyisthebaseplane,planexozisthecentreplane,andplaneyozisthemidstationplane.Co-ordinatesystem6Thesh
5、iptheoryconceptTheshiptheoryisthescienceofitsseakeeping(seaworthiness):buoyancy,stability,insubmersibility,propulsion,maneuverability,motion(rolling).Buoyancy–thevessel'sabilitytoswiminacertainpositionrelativetothesurfaceofthewater,carryingalldesignedaccor
6、dingtohisserviceloads.Thestabilityoftheship–theabilitytoswiminalivesituationandreturnitassoonasthewilltoactbyexternalforces,hadrejectedavesselfromthesituation.Insubmersibility–thevessel'sabilitytomaintainbuoyancyandstabilitywhensinkingoneorgroupofcompartme
7、nts.Propulsion–thevessel'sabilitytodevelopacertainspeedwiththepowerofmainenginesandcorrespondingpumpedpropulsionsystems.Theship'sengineisaspecialdevice(e.g.,propeller),whichtransformstheenergyofthemainenginedrivingtheship.Control–thevessel'sabilitytochange
8、directionwhentransferringtherudderandmoveinastraightlinewiththepositionoftherudderonthecenterline.Rolling–fluctuationsofavesselconcerningbalanceposition.Seaworthyqualities,atwhichstudyingthevesselisconsidered
