Model experiments and theoretical calculations in waves on a high speed container ship with triple screws

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Model Experiments and TheoeticaI Calculations in Waves on a High Speed Container Ship with Trip!e Screws

By Fukuzo TASAI

Yasushi SUGIMURA

Mitsuhiro ABE Hiroyuki ARAKAWA

and Masanori KOBAYASHI

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Roprirrted from

JOURNAL OF SEIBU ZUSEN KAI

(THE SOCIETY OF NAVAL ARCHITECTS OF WEST JAPAN) No. 45 FEBRUARY 1973

7CH1EF

Lab.

y. Scheepsbouwkunk

Technische Hogeschooi

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Model Experiments and Theoretical Calculations in Waves

on a High Speed Container Ship with Triple Screws

By Fukuzo TASAI

Yasushi SUGIMTJRA

Mitsuhiro ABE Hiroyuki ARAKAWA and Masanori KOBAYASHI

Summery

In this paper, motions, accelerations, deck pressures and resistance increase on high speed container ship with triple screws in waves were investigated. Model

experiments were conducted to be compared with the theoretical calculations, in regular head seas, in regular beam seas and in irregular beam seas.

Fleaving, pitching, swaying, yawing and rolling motions were computed by

solving the equations based on the Strip Method.

Especially, the equations of lateral motions were solved by taking into account the new non-linear effects on inertia, damping and restoring moments in rolling

motion, in which, inertia and damping moments were determined by using the

results of free rolling experiments. Following conclusions were obtained.

The calculated amplitudes of heaving and pitching motions, relative motions and vertical accelerations in head seas were in good agreement with model experi-mental ones, except the amplitude of vertical acceleration at stern.

In beam seas, the calculated amplitudes of rolling motion which were

computed by taking into consideration the new non-linear effects, coincided very satisfactorily with the model experimental ones.

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Length between perpendiculars L» (m) 252.00 4.000

Breadth B (m) 32.20 0.511

Draft cf (m) 11.00 0.175

Volume of displacement J (m3) 51128.0 0.20447

Blook coefficient C,, 0.5728 0. 5728

Prismatic coefficient C,, 0.5892 0. 5892

Midship section area coefficient G,, 0.9722 0.9722

Waterplane area coefficient C,, 0.7851 0. 7851

Longitudinal center of Buoyancy from M. S. 1» (m) 6.56 0. 104(aft)

Longitudinal radius of gyration K» 0. 25 0.25 Lp,,,

Transverse radius of gyration K,,,, 0. 379 B 0. 3792 B

Test value

Pitching period T,, (sec) 7.30 0.92

Heaving period T,, (sec) 8. 10 1.02

Rolling period T,, (sec) 20. 0 2. 520

Center of gravity above keel line KG (m) 13. 30 0.211

(9)

80 ₄₅

Section F P

AP Y2

S Potentiometer for Surge H, Potentiometer for Heave

P; Potentiometer for Pitch

P;P2, P3 Pressure gage

Ar, As, Accelerometer

9,2

P, P2P3 Pressure gage

AF Accelerometer

R Relative bow motion sensor

EP Fig. 4 Fig. 3 Square Station /2 91/2 FR T, Thrust dynamometer Q ; Torgue dynamometer

N Counter of number of revolution

M; D.0 Motor

R ; Reletive bow motion sensor

Accelerometer

R Rettive Motion Sensor

(10)

3 * 3tOY

S

Potentiometer for surge and Sway

H

Potentiometer for Heave

Y

Potentiometer for Yaw

P

Potentiometer for Pitch

R ;

Potentiometer for RoH

G ;

Center

of gravity of the Model

J ;

Vertical

gyroscope

Fig. 6

Photo 2. 2tL = 1.25, F = 0.275

(11)

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Exp Cal Triple Screw

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-g5 ' :l(U i45

Fig. 19 Station

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275

Vertical 400elerotlon at Station 1/2

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Fig. 15

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Fig. 20 Station 1/2

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--. .5 os or /. StatiOn g I/O

\.\

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Coreporison with Single Screw CFn 0275

50 inkl Exp Triple Col 5 Screw c Single Screw c 03 (NB) 030 20 ¡ 20 IO os o IS 20 o

Comperison with Singlo Scrow Fn 0

Triple screw 2.0 S! ng le scr ew "j .5- (H B) I-0 ro 00 0 lo IS 20 - O5 1.0 15 ax

Fig. 18 Station 1/2 Z, Ii1Z

Comparison with Single Screw C En - 0 275 t

Exp Col Triple Screw Sirgle screw (NB) 4

î;

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C)Hi) F=0.275

(14)

0tU Fig. 8

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20 lo- Station 9½

1

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Experiment

-. - Theory LineO,) -lw/A /100 Theory Non Linear) Theory Non Linecr)

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Exporitn'Oflt

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Thoory(Non Linear) Theory)

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05 0 i5 20

Fig. 32

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