中英文对照干舷计算书.doc

1. The Basis of Freeboard Calculation
The calculation shall be in accordance with International Convention on Load Line 1966 with amendment for 1979, modified by protocol of 1988 for Type “A” ship.

2. Primary Parameter for this vessel
LBP = 90.0 m
B = 15.0 m
D = 6.9 m
T = 5.4 m
D = 5607.7 t

3. Defined Parameter for this vessel
1. Length L
LWL(0.85D) ´ 96% = 92.064 ´ 96% = 88.381 m
LPP(0.85D) = 90.079 m
so: L = 90.079 m
2. Breadth B
B = 15.0 m
3. Depth D
D = 6.9 m
4. Calculated Depth D1
D1 = 6.9 + 0.012 = 6.912 m
5. Block Coefficient Cb

where: d1 = 0.85D = 5.865 m
Ñ = 5995.0 m3
> 0.68

4. Freeboard Calculation
This vessel to be “A” type ship.
Minimum Freeboard F = F0 + f1 + f2 + f3 + f4 + f5 + f6
4.1 Base Freeboard F0
F0 = 985.185 mm
4.2 Length Correction f1
This vessel is type “A” ship,
so: f1 = 0
4.3 Block Coefficient Correction f2

where: f1 = 0
Cb = 0.7565
so: f2 = 55.417 mm
4.4 Depth Correction f3

where: R = L/0.48 = 187.665
D1 = 6.912 m > L/15 = 6.005
L = 90.079 m
so: f3 = 170.162 mm
4.5 Superstructure Correction f4
The height of forecastle and poop is 2.70m and larger than standard height H1=1.951m and the length of superstructure is 6.716+21.6+0.015=28.331m=0.315L, so k is 0.225 according to the table and f0 is 888.894 mm,
f4 = f0 ´ k
so: f4 = 199.986 mm
4.6 Non-standard Sheer Correction f5
The ordinates of standard sheer profile
Station
Formula
Ordinate(mm)
Factor
Product
After half
After perpendicular
25(L/3+10)
1000.658
1
1000.658
L/6 from A.P.
11.1(L/3+10)
444.292
3
1332.876
L/3 from A.P.
2.8(L/3+10)
112.074
3
336.222
Amidships
0
0
1
0
Forward half
Amidships
0
0
1
0
L/3 from F.P.
5.6(L/3+10)
224.147
3
672.441
L/6 from F.P.
22.2(L/3+10)
888.585
3
2665.755
Forward perpendicular
50(L/3+10)
2001.317
1
2001.317

The standard average height of sheer:
After half
Forward half
The actual height of sheer to be 0mm both after and forward half.
Because forecastle height 2.911m is greater than the standard 1.951m, sheer credit is given for the forecastle:

where: y = 2.911 – 1.951 = 0.96 m = 960 mm
L’ = 6.731 m
L = 90.079 m
so:
Because poop height 2.70m is greater than the standard 1.951m, sheer credit is given for the poop:

where: y = 2.70 – 1.951 = 0.749 m = 749 mm
L’ = 21.6 m
L = 90.079 m
so:
so:

4.7 Correction for position of deck line f6
f6 = 0
4.8 Due to all above calculation, minimum freeboard
F = F0 + f1 + f2 + f3 + f4 + f5 + f6
= 985.185 + 0 + 55.417 + 170.162 – 199.986 + 271.886 + 0
= 1282.664 mm

5. Survey Freeboard
5.1 Summer Freeboard FS
FS = D – d = 6912 – 5400 = 1512 mm > 1282.664 mm
Obviously comply with the requirement, so
The actual summer freeboard FS = 1512 mm
5.2 Tropical Freeboard FT

5.3 Winter Freeboard FW

5.4 Winter North Atlantic Freeboard FWNA
FWNA = FW + 50 = 1624.5 + 50 = 1674.5mm
5.5 Summer Fresh water Freeboard FF

5.6 Tropics Fresh water Freeboard FTF

6. Minimum Bow Height hs

= 4200mm

where: L = 90.079 m
d1 = 0.85D = 5.865 m
Cb = 0.7565 > 0.68
Cwf = 0.395
For this vessel, the bow height for forecastle deck at the forward perpendicular to be 4411mm , so it meets the requirement.

7. Deck line and load line mark plan
Refer to page 12, this drawing shows the starboard, and the port is the symmetry.

一. 说明
本计算书按《1966年国际载重线公约》1988年议定书中对船舶有关规定和要求进行计算、编制。本船为“A”型船。

二. 船舶主要尺度
垂线间长 LBP = 90.0 m
型　　宽 B = 15.0 m
型　　深 D = 6.9 m
夏季载重线吃水 T = 5.4 m
排 水 量 D = 5607.7 t

三. 规则定义尺度
1. 船长 L
水线长(0.85D)的96%：LWL(0.85D) ´ 96% = 92.064 ´ 96% = 88.381 m
0.85D处首柱前缘至舵杆中心线长度：LPP(0.85D) = 90.079 m
取大者，故：L = 90.079 m
2. 船宽 B
B = 15.0 m
3. 型深 D
D = 6.9 m
4. 计算型深 D1
D1 = 6.9 + 0.012 = 6.912 m
5. 方形系数 Cb

式中： d1 = 0.85D = 5.865 m
Ñ = 5995.0 m3
> 0.68

四. 最小干舷计算
本船属“A”型船舶。
最小干舷 F = F0 + f1 + f2 + f3 + f4 + f5 + f6
1. 基本干舷 F0
本船属“A”型船舶，由《法规》查得，当L = 90.079m时
F0 = 985.185 mm
2. 船长修正 f1
本船属“A”型船舶，
故：f1 = 0
3. 方形系数修正 f2

式中： f1 = 0
Cb = 0.7565
故：f2 = 55.417 mm
4. 计算型深修正 f3

式中： R = L/0.48 = 187.665
D1 = 6.912 m > L/15 = 6.005
L = 90.079 m
故：f3 = 170.162 mm
5. 上层建筑和围壁结构对干舷的修正 f4
本船首楼和尾楼的高度为2.70m大于上层建筑标准高度H1=1.951m；上层建筑有效长度E=6.716+21.6+0.015=28.331m=0.315L；查表插值得，折减百分数k为0.225；上层建筑有效长度为1.0L时的干舷减除量f0为888.894mm。
f4 = f0 ´ k
式中： f0 = 888.894 mm
k = 0.225
故：f4 = 199.986 mm
6. 舷弧修正 f5
标准舷弧剖面的纵坐标值按下表确定：
位置
计算公式
纵坐标值(mm)
系数
乘积值
船后
半部
尾垂线
25(L/3+10)
1000.658
1
1000.658
离尾垂线L/6
11.1(L/3+10)
444.292
3
1332.876
离尾垂线L/3
2.8(L/3+10)
112.074
3
336.222
船中央
0
0
1
0
船前
半部
船中央
0
0
1
0
离首垂线L/3
5.6(L/3+10)
224.147
3
672.441
离首垂线L/6
22.2(L/3+10)
888.585
3
2665.755
首垂线
50(L/3+10)

2001.317
1
2001.317

标准舷弧的平均弧高：
后半部：
前半部：
本船实际舷弧的平均弧高前后半部均为0mm。
本船首楼封闭部分的平均长度为6.731m，首楼在舷弧末端处的实际高度为2.911m大于上层建筑标准高度1.951m, 封闭首楼对船前半部平均舷弧高的增加：

式中： y = 2.911 – 1.951 = 0.96 m = 960 mm
L’ = 6.731 m
L = 90.079 m
故：
本船尾楼封闭部分的平均长度为21.6m，尾楼在舷弧末端处的实际高度为2.70m大于上层建筑标准高度1.951m, 封闭尾楼对船后半部平均舷弧高的增加：

式中： y = 2.70 – 1.951 = 0.749 m = 749 mm
L’ = 21.6 m
L = 90.079 m
故：
故舷弧修正：

7. 甲板线位置修正 f6
f6 = 0
8. 最小干舷
F = F0 + f1 + f2 + f3 + f4 + f5 + f6
= 985.185 + 0 + 55.417 + 170.162 – 199.986 + 271.886 + 0
= 1282.664 mm

五. 干舷勘定
1. 夏季干舷 FS
FS = D – d = 6912 – 5400 = 1512 mm > 1282.664 mm
满足要求，故实际夏季干舷 FS = 1512 mm
2. 热带干舷 FT

3. 冬季干舷 FW

4. 冬季北大西洋干舷 FWNA
FWNA = FW + 50 = 1624.5 + 50 = 1674.5mm
5. 夏季淡水干舷 FF

6. 热带淡水干舷 FTF

六. 最小船首高度 hs

= 4200mm
式中： L = 90.079 m
d1 = 0.85D = 5.865 m
Cb = 0.7565 > 0.68
Cwf = 0.395
船首高度为在首垂线上自相应于核定夏季载重水线到船侧露天甲板上边的垂直距离。本船实际船首高度为4411mm，大于hs值，满足《法规》要求。