轴系设计书

16,500 DWT PRODUCT OIL/CHEMICAL

IMO II （K） TANKER

SHIP NO.： HY-005/006

ZHEJIANG FRIENDSHIP S/Y

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Strength calculation for Propulsion Shafting

轴系强度计算书

OM-GFW50620-401-002JS

编   制

校   对

标   记

重 量 kg

比    例

审   核

标   检

SHEETS

1/4

审  定

签  名

日   期

MARINE ENGINERING

面积：0.06m2

1.0
Brief

Each shafting comprises:

—
Intermediate shaft

—
Propeller shaft (oil lubricated)

—
Fixed pitch propeller

The propeller is to be fit on aft end of propeller shaft by wet type keyless fitting mode.

The propeller shafts will be arranged for inward withdrawal.

The stern tube bearings are to be of white-metal type. The stern tube seal will be of oil lubricated simplex compact type.

The design of shafting will conform to the requirement of ABS, without ice Class notation

Main engine: B&W 6S35MC
1 set

4440 kW×173 r/min

2.0
Minimum diameter of shafts:

— shaft design factor,

1)
For keyless attachment by shrink fit, =1.22;

2)
For stern tube shafts, =1.15;

— power at rated speed, kW;

— rpm at rated speed, r/min;

c1— 560;

c2— 160;

— minimum specified ultimate tensile strength of material in N/mm2, 570 N/mm2 for carbon, alloy and austenitic stainless steel tailshafts fitted with oil lubricated bearings or with continuous shaft liners or equivalent;

2.1
Minimum lineshaft diameter

2.2
Minimum propeller shaft diameter (mm)

2.3
Minimum propeller shaft forward section diameter (from forward stern tube bearing to fore end of the shaft)

D2 = 100×1.15× = 310.53 mm

2.4
No ice notation is requested.

3.0
Coupling

3.1
Coupling fitting bolts

Formula: db = 0.65
mm

db—
diameter of bolts at joints, in mm

— required diameter of shaft as 2.1;

— minimum specified ultimate tensile strength of material in N/mm2, take 560 N/mm2 (maximum calculation value is 600 N/mm2 for carbon, alloy and austenitic stainless steel tailshafts fitted with oil lubricated bearings or with continuous shaft liners or equivalent);

c— 160;

—Number of bolts fitted in one coupling, here N=8;

—bolt circle diameter in mm, here =495;

Ub— Specified minimum tensile strength of bolts, N/mm2,here Ub=725 N/mm2

db = 0.65× =45.67mm;

When Ub =570N/mm2 (as same as shaft material)

db’= 0.65× =51.51 mm;

(The value of db’ is to be used for 3.2)

3.2
Thickness of coupling flange

Formula: R≥0.2D and T≥db’

D—see 2.1;

db’
—see 3.1;

T≥0.2×270.02=54.00 mm;

T≥51.51 mm;

∴T≥54.00 mm
take T=65 mm

3.3
Fillet radius at the base of the coupling flange

Formula: R≥0.08D;

D— shaft diameter at the coupling, mm, take D=360 mm;

R≥0.08×360=28.8 mm;

4.0
Final determination for relevant date of shafting will be subject to calculation of torsional vibration and shafting alignment.