MAR2108 Damage Stability 9 1

May 5th, 2015
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Review of terms and ship stability Impact of design changes on stability Consideration of large heel angles Effects of a shift of cargo

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MAR2108 Damage Stability 9 1 Damage StabilityDr Ana MesbahiTOPICS COVEREDReview of terms and ship stabilityImpact of design changes on stabilityConsideration of large heel anglesEffects of a shift of cargoDynamic stabilityLoss of suspended loadEffect of wind on heelingLaunchingDamage StabilityFlooding2OBJECTIVESIntroduce background to damage stabilityTo be aware of the concepts associated with damagestability calculationsGeneral concept of subdivision3INTRODUCTIONSo far have only looked at trim and stability for theintact ship:Moving a mass horizontally in a ship will change thetrim or listMoving a mass up or down will change the stabilitycharacteristics (GZ-Curve)wdG 0 G1 =4DAMAGE STABILITYA ship may sustain damage resulting in flooding from:CollisionGroundingEnvironmental degradationAttackIf unrestricted flooding is allowed to take place theship will ultimately be lost5DAMAGE STABILITYIn general, damage stability calculations are requiredto assess the behaviour of the ship after damage.There are some fundamental effects of damage:The draught will change and the ship will trim.If the flooded space is unsymmetrical with respect tothe centerline, the ship will heel.Trim and heel may result in further flooding throughimmersion of openings in bulkheads, side shell or decks.Therefore, flooding changes both the transverse and thelongitudinal stability.6DAMAGE STABILITYIn order to assess the stability o

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