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Article type: Cover
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Cover1-
Published: December 30, 1956
Released on J-STAGE: February 24, 2018
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Article type: Cover
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Cover2-
Published: December 30, 1956
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Article type: Appendix
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App1-
Published: December 30, 1956
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Shojiro OKADA, Sumio NOBUTO
Article type: Article
Pages
1-8
Published: December 30, 1956
Released on J-STAGE: February 24, 2018
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In this paper, the authors report on the shape of stacks of ships from the standpoint of avoiding smoke nuisance. It consists of the results of model experiments in a windtunnel, observation of smoke during actual ship trials, theoretical calculation of flow around the stack, and the results of experiments on the pressure distributions on the various stacks. Furthermore the general description on the various kinds of method of avoiding smoke nuisance is made, refering to other papers on this subject.
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Tesujiro TOMITA, Yoichi MIYAMOTO, Toshiaki IMAI
Article type: Article
Pages
9-15
Published: December 30, 1956
Released on J-STAGE: February 24, 2018
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Looking over the data of super tankers built for these few years, we can easily see that the block-coefficients of those vessels are larger than the usual values of ordinary cargo ships, but can not find any definite standard on it. To determine the most economical block-coefficient, we calculated initial costs and earning efficiencies for super tankers with large block-coefficients using the results of the tank tests which have been carried out at our request by the Transportation Technical Research Institute. Our conclusion is, in a word, that it is not advantageous to choose larger blockcoefficient than 0.80, especially from a stand-point of earning efficiency.
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Yoshiro KASAMA, Rinichi WAHIMI
Article type: Article
Pages
16-20
Published: December 30, 1956
Released on J-STAGE: February 24, 2018
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Recently it is considered that some failures of propeller shaft and sleeve are ascribed to the lateral vibration of propeller shaft excited by hydrodynamic forces acting upon the propeller. The authors carried out the calculation of the natural frequency of the lateral vibration of shaft and measured it by a simple way on two ferry boats. Comparison between the calculation and the measurement shows that the natural frequency of vibration of the fundamental mode can be estimated pretty well by our approximate method of calculation.
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Minoru HIRATA
Article type: Article
Pages
21-28
Published: December 30, 1956
Released on J-STAGE: February 24, 2018
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As a cause of erosion damage on manganese bronze coated tailshaft sleeves of the ships built after the termination of the War may be enumerated the relative vibrations of the tailshaft to the hull. On seven ships we have measured such relative vibrations just ahead of the stern tube using the cantilever type pickups with strain-gauges and also at the same time horizontal hull vibrations were measured by strain gauge type hull vibrographs and recorded on the same oscillo papers. By analyzing these oscillograms the aspect of relative vibrations of the tailshaft to the hull have been visualized and the effect of the higher order vibration of the hull on these relative vibrations have been ascertained to a certain extent.
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Koshiro KITADA, Masafumi IKE, Ichiro KURIHARA
Article type: Article
Pages
29-33
Published: December 30, 1956
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To investigate the longitudinal strength of a floating dock of pontoon type the model experiments were carried out which revealed interesting stress concentration at the slit of the pontoon and contribution of pontoon to the longitudinal strength as showed in this paper.
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Hideo SASAJIMA, Ichiro TANAKA
Article type: Article
Pages
34-39
Published: December 30, 1956
Released on J-STAGE: February 24, 2018
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1. Applying the von Karman's similarity theory to flow near the wall, the following analytical form of the mixture length is obtained. [numerical formula] n=0∼1, K=0.4, σ_1=8.4, C_2=-3.8. (See below as to notation.) This expression shows fairly good agreement for Nikuradse's divergent channel flow (1st Report) and may be recommended for use to the general turbulent boundary layer with proper consideration. 2. For flow in a convergent channel the analysis as for the divergent case (1st. Report) has been made, and it is shown that the mixture length distribution can be approximated by either the same formula for flow along flat plate (6') or Ky without much error. Discussion like 1. cannot be made because of the uncertainty of calculated results. 3. Lastly the remark is added that the approximation of shearing stress distribution by pressure gradient only, as usually used, is not satisfactory even in the sense of the first order and needs the correction due to acceleration terms. The idea of "effective pressure gradient" is presented.
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Article type: Appendix
Pages
40-41
Published: December 30, 1956
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Article type: Appendix
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App2-
Published: December 30, 1956
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Article type: Appendix
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Published: December 30, 1956
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Article type: Appendix
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App4-
Published: December 30, 1956
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Article type: Appendix
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App5-
Published: December 30, 1956
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Article type: Appendix
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App6-
Published: December 30, 1956
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Article type: Appendix
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App7-
Published: December 30, 1956
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Article type: Cover
Pages
Cover3-
Published: December 30, 1956
Released on J-STAGE: February 24, 2018
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