王迎光新课件第二章

1、 21 Introduction Chapter Two: Flotation W 3 3 , , , ,/ Wship weighttonnes ship displacementtonnes ship displacement volumem water specific gravitymtonnes B w W G In the above formula: 重力与浮力的大小相等而方向相反 Chapter two: Flotation , , GBGB W xxyy Upright Flotation 正浮状态 d d xG=xB yx zB zG W G B o zz B G W o

2、,0, () GB BGGB Wxx yyzztg Heeling condition 横倾状态 Chapter two: Flotation zG zB y d o W G B z x xG=xB yG yB z o B G W ,0, () GB BGGB Wyy xxzztg Trim condition 纵倾状态 Chapter two: Flotation x d dF ZB ZG dA d y ZB ZG W G B o z XB XG o W G B z ,(), () BGGB BGGB Wxxzztg yyzztg Arbitrary condition 任意状态 Chapt

3、er two: Flotation zB zG dA xB xG W o G B x d y zB zG G B o yB yG dF z W z 22 Ship weights and center of gravity Chapter two: Flotation 123 1 n ni i WWWWWW 111 111 nnn iiiii i iii GGGnnn iii iii WxWyWz xyz WWW Total weights 总重量 Center of gravity 重心 23 Displacement and center of buoyancy Chapter two:

4、Flotation y xF y F z dz x o y dx o x d z x W dA dz /2 /2 2 L W L Aydx /2 00/2 2 ddL W L A dzydxdz yozFW dMxA dz xoyW dMzA dz /2 /2 2 L oy L Mxydx 排水量和浮心位置计算 23 Displacement and center of buoyancy Chapter two: Flotation y xF y F z dz x o y dx o x d z x /2 /2 /2 /2 L oy L F L W L xydx M x A ydz /2 00/

5、2 2 ddL yozFW L MxA dzxydxdz /2 0/2 /2 0/2 dL yoz L B dL L xydxdz M x ydxdz /2 00/2 2 ddL xoyW L MzA dzzydxdz /2 0/2 /2 0/2 dL xoy L B dL L yzdxdz M z ydxdz 排水量和浮心位置计算 23 Displacement and center of buoyancy Chapter two: Flotation 8 y7y6y5y3y1y2y4y0 4213657 y17y16y15y14y13y12y11y10y9y8y18y19 16121 F

6、911141315 y20 20181719 X y Y XF dxX L/2L/2 用梯形法计算水线面积 /2 / /2 22 L Wi L AydxLy / 020 011920 2 i yy yyyyy /2 /2 /2 22 L oyii L MxydxLk y / 10119128 191200200 012 1 91010 2 ii k yyyyyy yyyyyy / 2 / / 2 / 2/ / 2 L iioy L FL W i L xydx k yM xL A y ydz where where Finally 23 Displacement and center of bu

7、oyancy Chapter two: Flotation Waterplane area curve and its properties 水线面面积曲线和其特性 0 d W A dz 0 0 d W B d W zA dz z A dz VP C Wd oCDE oCDFAd 面积 面积 Aw1 oE Aw0 F Aw C Z Aw2 Aw AwdD d dzZ 23 Displacement and center of buoyancy Chapter two: Flotation Tonnes per centimeter curve 每厘米吨数曲线 ( /) 100 W wA TPC

8、t cm Displacement volume curve 排水体积曲线 k k 曲线 曲线曲线 o z 01 0 121 1 () 2 ()() i d iWWW WWWnWn A dzdAA AAAA 23 Displacement and center of buoyancy Chapter two: Flotation Longitudinal center of buoyancy curve 浮心纵向坐标曲线 Vertical center of buoyancy curve 浮心垂向坐标曲线 z ZB ZB=f(z) XB=f(z) xF=xB 尾首 XF=f(z) xF,xB

9、z 23 Displacement and center of buoyancy Chapter two: Flotation Sectional area curve and its properties 横剖面面积曲线及其特性 o L/2 x L/2 dx b AM AS AS x d c /2 /2 2 L S L A dx /2 /2 /2 /2 L S L B L S L xA dx x A dx P M C obcdAL 曲 线 所 围 面 积 矩 形 面 积 24 Bonjean curve and its application Chapter two: Flotation A

10、S= f ( z ) 1 0 dA 20 W1 648 Mo y= f ( z ) 1 21 61 42 0 1 8 dF L1 /2 /2 2 L S L A dx / 2 / 2 / 2 / 2 L S yoz L B L S L xA dx M x A dx / 2 / 2 / 2 / 2 L oy xoy L BL S L Mdx M z A dx 邦戎曲线及其运用 25 Flasov curve and its application Chapter two: Flotation 2 000 1 , 2 ZZZ ozoy aydzbmy dzcmzydz o a,b,c a=f(z) z c=f(z) b=f(z) y o z y z dz Flasov curve can be utilized to calculate the displacement volume and center of buoyancy at trim and heeling conditions 符拉索夫曲线可用于计算船舶在具有纵倾和横倾状态下的排水体 积和浮心位置 Load line marks Load line marks 载重