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Volume 19, Issue 11
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[in Japanese]1984 Volume 19 Issue 11 Pages 854-861
Published: November 01, 1984
Released on J-STAGE: May 31, 2010
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Yoshinori Fukui, Yoshio Sasaki, Kiyoshi Moriya1984 Volume 19 Issue 11 Pages 862-872
Published: November 01, 1984
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSA study has been carried out concerning the design stress of marine propellers made of Mn bronze and Ni-Al bronze considering the fatigue strength at 109 cycles.The fatigue strength up to 108 cycles and the crack propagation characteristics of the materials were obtained in laboratory tests conducted under the same condition as full-scale propellers in service, and these test data were utilized in the study. The test data were analysed statistically and calculated according to fracture mechanics. The S-N curve which is necessary for the fatigue design could be obtained through this procedure. The relation between the design stress and the design life, which is dependent on each kind of vessel and the degree of safety, was established by applying Miner's rule to the design S-N curve and the stress frequency distribution model which coincided well with the measured data on vessels in service. It is becoming possible for us to have a near satisfactory level of the design stress through this study, if the stress frequency distribution can be obtained for each kind of vessel in various service conditions.View full abstractDownload PDF (2826K) -
Dian Zhang1984 Volume 19 Issue 11 Pages 873-882
Published: November 01, 1984
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSThis article describes the analysis of straight alignment and slope alignment of the shafting using transfer matrix method to divide the fore and aft parts of the sterntube bearing into tens or even hundreds (instead of 3 or 4) of non-linear flexible supports, and both accurate maximum flexible supporting pressure and average supporting pressure can be reached. A comparison has been made with the results calculated from a sterntube bearing which was divided into 3 or 4 flexible supports and used only as support (with different supporting points) .
The calculation can also be done with a personal computer.View full abstractDownload PDF (1087K) -
Yoshinori Hirayama, Nobuaki Sekioka1984 Volume 19 Issue 11 Pages 883-890
Published: November 01, 1984
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSMitsubishi Heavy Industries Ltd., which has been developing and manufacturing many UEC type diesel engines since 1955, completed and delivered the first 6UEC52L type engine, one of the newest L series on February 1984 as scheduled.
The L series of UEC diesel engines, based on the good experiences obtained with more than 300 H and HA type engines, has been developed and designed based on the philosophy of meeting the needs of customers, i.e., energy saving, lowest propeller revolution, high reliability and easy maintenance.
The L type engine has been designed so as to have the merits for each shipowners, crews and shipyards respectively.
This paper describes the concepts used in developing the L type engine, its main features and the test results of the first 6UEC52L engine. From the test results the UEC L type engine has been proved to have the best specific fuel consumption, as low as the designed value, and the same reliability as conventional type engines as confirmed from various measurements.View full abstractDownload PDF (2728K) -
1984 Volume 19 Issue 11 Pages 891-925
Published: November 01, 1984
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSDownload PDF (6714K)
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