-
Article type: Cover
Pages
Cover1-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Cover
Pages
Cover2-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
[in Japanese]
Article type: Article
Pages
1-13
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Eisuke IWASA, Masaru IKEDA, Norio TATARA
Article type: Article
Pages
14-19
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
As a series of the study on the small harbour craft, the data on the pilot launches are presented in this paper.
View full abstract
-
Hisashi OGAWA, Tsuneo UENO, Norio ISHIZAKA
Article type: Article
Pages
20-26
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
General excessive noises are frequently discussed lately in Japan. It seems also to be an important problem of the outfitting works to improve the living condition of a ship. The noise in ventilation is considered to be an excessive noise in a ship, and in this paper we report an investigation that to what extent such excessive noise in the duct could be attenuated. The experiments were made on various cases such as bent ducts, branched ducts, and straight and bent ducts both with interior sound absorbing material. As a result we recognized that further sound absorbent method was necessary for low frequency sound. Therefore we added further experiment on a few ducts with interior perforated panel to attenuate the low frequency sound.
View full abstract
-
Seikan ISHIGAI, Jumei KIWAKI
Article type: Article
Pages
27-32
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
Cargo-oil tanks of tanker are usually equipped with heating coils. Its ordinary arrangement is shown diagrammatically in Figs. 1 and 2. Steam is supplied downward from one end of the heating coil, and the condensate is returned upward from the other end. In designing the heating system, the heating surface and the steam consumption must be evaluated making use of past experiences. An investigation into the conventional method of the evaluation leads us to the conclusion that a refinement of the evaluation will certainly result in a substantial reduction of the weight of the heating coils as well as the amount of steam consumption. some important points in the above reasoning are as follows. 1. In Calculating heat transfer through heating coils from steam inside to outside, the heating coil must be treated as a combination of separately calculated two parts, namely, the steam condensing section and the liquid-water cooling section, because the mechanism of heat transfer is entirely different. The necessity is demonstrated in a result of a simple model experiment with a glass tube as shown in Figs. 3 and 4. The coefficients of heat transfer for the steam-condensing section and the water-cooling section, k_s and k_w, show tendencies logically understandable. However, if the entire length is treated as a single process of heat transfer, then the coefficient of heat transfer, k_g, is sometimes larger than any of k_s and k_w, sometimes equal to k_s, and sometimes in-between of k_s and k_w, as indicated in Fig. 5. Evidently k_g is a poor measure for evaluating past experiences. An improvement in this point alone may result in a more exact design and thereby in a economy of heating surface. 2. The film coefficient of heat transfer from condensing steam is excellent only when the heating surface is free from accumulation of air and codensate. However, the usual way of arrangement of heating coils as shown in Figs. 1 and 2 will inevitably hold up a considerable amount of air and water as indicated by Fig. 6. 3. The rate of heat transfer at the steam inlet will exceed that of all other part of the coil because, at this point, the steam temperature is high and neither condensate nor air can accumulate. This means that the heating at the bottom of cargo-oil tanks is quite uneven. In another words, the temperature distribution in cargo-oil tanks must be uneven. If the heated medium is water, then water near the free surface will obtain a substantially higher temperature than water at the bottom which might practically be cold. Since the heated medium is not water but crude oil consisting of a variety of substances of different boiling temperatures, the temperature at the free surface may not rise substantially because the evaporated gasoline will absorb latent heat. It is certainly desirable to heat uniformly at the bottom and prevent losses both in heat and gasoline. 4. All of these losses can be avoided if the coil is heated by hot water instead of steam. It must also be remembered that a hot-water piping can carry more heat than a steam piping of the same size. 5. Heat transmission through bottom and side plates of ships was also discussed briefly in the paper.
View full abstract
-
Minoru HIRATA
Article type: Article
Pages
33-38
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
It is well known that corrosion damages often occur on the tailshaft sleeves. The author is performing the series of experimental and theoretical investigations for this problem, and some of these results were reported in our previous papers. In the present paper, he discusses the possibilty of cavitation occurence on actual ships using the theoretical formula aud measured results of actual tailshaft vibration.
View full abstract
-
Masaaki HANADA, Shigeru AKAZAKI
Article type: Article
Pages
39-44
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
The design of a standard propeller series can be carried out with a K-η_p diagram which indicates the contour curves of the new horsepower coefficient K and the propeller efficiency in open water η_p upon values of pitch ratio as abscissae and values of (1-s) as ordinates, and with the aid of two diagrams which indicate basic relations of one P_l = 10^<-6>N^3D^5 and the other V_a = V_p(1-s).
View full abstract
-
Shoichi SUDO
Article type: Article
Pages
45-51
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
It is known that the tidal current, at the time of speed trials of ships, has an important effect upon the final results of the speed trial. Up to this time, however, there are very few data concerning the actual effects of the tidal currents on trial courses. This report deals with the results of specially planned standardization trials of two vessels of exactly the same size and type. Especially for these trials, the absolute velocity of the tidal current on the trial courses was measured during a run of 24 hours. In this paper, the effect of tidal current on the speed trial results is mainly described.
View full abstract
-
Seikan ISHIGAI, Akira UEDA
Article type: Article
Pages
52-57
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
Affected by the remarkable development of the high-powered marine diesel engine, it has recently become a matter of great importance for the steam plant engineers to find the ways and means to improve, as much as possible, fuel rate of the marine steam turbine installation. In this brief paper, the authors in the first place describe several possible ways to affect the system as regards fuel economy and secondly show an example of heat balance calculation by applying several remarkable ways among them. Application of diesel engine as an auxiliary drive contributes greatly to the fuel saving especially in case that a certain consideration is given in such a way that the loss heat transmitted by cooling water and by exhaust gas is recovered to the cycle by feed water and main boiler respectively. The example of heat balance calculation, indicates that by applying higher steam temperature and diesel generator to the system, it is possible to obtain approximately ten per cent of fuel gain when compared with the current system and it is of great economy as regards operating cost even though increase in the first cost of machinery may have to be considered.
View full abstract
-
[in Japanese]
Article type: Article
Pages
58-60
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
61-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
62-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App1-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App2-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App3-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App4-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App5-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Appendix
Pages
App6-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
-
Article type: Cover
Pages
Cover3-
Published: October 15, 1958
Released on J-STAGE: February 24, 2018
CONFERENCE PROCEEDINGS
FREE ACCESS
