Journal of Zosen Kiokai

On the Virtual Water Masses of Ship while Turning

S. Akasaki

1951 Volume 1951 Issue 73 Pages 1-17
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.73_1

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By Experiments with a series of model ships, the virtual water masses of ship while turning were obtained.

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Wave Resistance of a Sphert in a Shallow Sea

Masao Kinoshita

1951 Volume 1951 Issue 73 Pages 19-38
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.19

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In the following paper, the author investigates mathematically the wave resistance of a sphere moving parallel to the free surface of a shallow sea. Correcting the errors committed by T. H. Havelock and others, he has obtained a new formula, and has carried out numerical calculations, the results of which are shown in several diagrams.
The new formula is
R=πA²c² /ρ∫=^π/2_Φ0K³secΦ (1+tanh Kh)²/gsec²Φ (c²-ghsec²Φ) +K²c⁴h (e^-f₁K+e-fK) ²dΦ.
where R=the wave resistance
A= ρgα³
α=the radius of the sphere
ρ=the density of the fluid
g=the acceleration due to gravity
c=the velocity of the sphere
h=the depth of the fluid
f₁ = the immersion of the sphere
f₂=the immersion of the image of the sphere or =2h-f₁
K and Φ₀, the lower limit of integration, are to satisfy the following relations respectively.
Kc² = g sec²Φtanh Kh (c²<gh sec² Φ)
Φ₀=0 when c2<gh
Φ₀=cos^-1 (gh/c²)^1/2 when c²>gh
Finally, the author makes some discussions on the results obtained, especially on the diagrams, and compares them with certain experimental ones.

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On the Preliminary Design of a Wooden Barge and Related Model Experiments on Grouping Barges

Takezo Yamamoto, Magao Kinoshita

1951 Volume 1951 Issue 73 Pages 39-55
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.39

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The authors describe, in the first half of this paper, the outlines of the preliminary design of a wooden barge which will be well adapted for use on extremely restricted and irregularly curved waters such as inland canals or rivers in north China, and select a form of the barge named “Y” type as the most suitable one not only for the performance but also for the mass production in that district.
In the latter half of this paper, they report some of the results of the towing experiments carried out on the “Y” type barge-models, and bring out the questions about grouping barges clearly from every point of view.

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Some notes on the propulsion of a ferry boat with screw propellers at both ends

Teiitiro Aoyama

1951 Volume 1951 Issue 73 Pages 57-60
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.57

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Under the above subject, following cases were treated : -
(a) The propellers at both ends were working at the same revolutions, where two sets of propellers- (1) with blades of the normal circular back sections, (2) with blades of the symmetrical sections of circular arc-were dealt with.
(b) The after propeller was working, the forward propeller being left to rotate freely.
(c) With the forward propeller removed, a single propeller aft was working.

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[title in Japanese]

[in Japanese]

1951 Volume 1951 Issue 73 Pages 61-75
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.61

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On the Method of White Metal Lining for Bearing

Tadasi Iijima

1951 Volume 1951 Issue 73 Pages 77-86
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.77

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The author investigated fundamentally on the method of lining of tin-base white metal to steel shell and made clear many factors that affect the adhesive force between bearing metal and shell.

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[title in Japanese]

[in Japanese]

1951 Volume 1951 Issue 73 Pages 87-101
Published: 1951
Released on J-STAGE: January 22, 2010

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.73_87

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On the Effectiveness of the Longitudinal Intercostal Girders as Longitudinal Members, and the Related Problems of Stress Concentration

Y. Watanabe

1951 Volume 1951 Issue 73 Pages 103-113
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.103

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Longitudinal intercostal girders are usually considered in active as longitudinal members when under tension, but it is quite sure that they are somewhat effective, though the degree of effectiveness in very ambiguous. Moreover, it is well known that, at the ends of that girder, a concentration of shearing stress occurs, and that, by means of tapering the ends, the concentration is avoided.
In this paper, the effectiveness as a longitudinal member is treated and the formula for that is given, by means of which it is made clear that about the half of the sectional area of the intercostal side girder in the double bottom of transverse system is effective as a longitudinal member under tension, and can be taken in the calculation of the moment of inertia of the section. The concentrations of shearing stress at the tapered ends are also treated, and the approximate formulae for the stress distribution in that case are given.

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A Consideration on the Thickness of Shell Plating near the Screw Propeller

K. Matsumoto

1951 Volume 1951 Issue 73 Pages 115-128
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.115

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The shell plating of any ship near her screw propeller must be exposed to the statical water pressure due to her draft and flow of water around as well as the dynamical water pressure coursed by the screw propeller in action.
If some part of the structure of the ship is inadequately weak, this part may be destroyed.
Regarding to this point, the author tried to find out how we can select the safe and adequate thickness of shell plating of this part.

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1951 Volume 1951 Issue 73 Pages 129-138
Published: 1951
Released on J-STAGE: September 04, 2009

DOIhttps://doi.org/10.2534/jjasnaoe1903.1951.129

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