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Volume 26, Issue 11
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[in Japanese]1991 Volume 26 Issue 11 Pages 600-605
Published: November 01, 1991
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSDownload PDF (677K) -
-1st Report : Modelling and Constant Speed Control of Shaft Generator-Shigeyuki Morita, Hidekazu Fukuba1991 Volume 26 Issue 11 Pages 606-613
Published: November 01, 1991
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSRecently, the controllable pitch propeller (CPP) has become popular because of such merits as (i) the maximum power of the main engine can be available at any speed condition of the voyage, (ii) a shaft generator can be used because of capability of keeping the engine speed constant at any navigation speed, and (iii) dead slow cruising is possible.
Introduction of the CPP, however, brings not only these merits but also complexity of how to control a regulator handle position of the engine (R) and the propeller pitch angle (θ) simltaneously. It means that these two parameters, R and θ interfere the outputs such as the propulsion force or engine speed.
Reported here is the simulation studies of the engine-CPP consolidated control to use a shaft generator normally at any navigation speed. For this, at first, a simulation model for the object system was made, and a decoupling control theory was applied to keep the engine speed constant. As a result, the expected performance was obtained.View full abstractDownload PDF (879K) -
-2nd Report : Optimization Control of Propeller Efficiency-Shigeyuki Morita, Hidekazu Fukuba1991 Volume 26 Issue 11 Pages 614-621
Published: November 01, 1991
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSAt 1st report. consolidated control of the engine controllable pitch propeller (CPP) was studied with the object of an ordinary use of a shaft generator at any navifation speed by adapting a decoupling control theory.
Content of this paper, 2nd report is the simulation studies to control the propeller efficiency optimally at any speed condition of the voyage. For this, an increased freedom by introducing the CPP which was used as an ordinary use of a shaft generator, namely was used to keep the engine speed constant at 1st report, was put to practical for this optimization control. It means that an engine speed is commanded at each cruising conditions by the propeller efficiency optimized table which has been made beforehand. As a result, the considerable improvemunt of the efficiency was obtained.View full abstractDownload PDF (853K) -
Hisaharu Sakai, Sadami Yada, Hiroaki Yonemoto, Yosuke Kitano, Hayao Ak ...1991 Volume 26 Issue 11 Pages 622-628
Published: November 01, 1991
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSExperiments on twe variable discharge systems of cooling sea water pump for main engine and for generator engines were conducted to evaluate the effects of electric power saving. One was a combination of a general purpose inverter, an automatic controller and a pair of temperature sensors, and maintained the required temperature difference of cooling sea water between inlet and outlet of main engine. The other was a combination of the inverter, the controller and a pressure sensor, and maintained the required delivery pressure within cooling sea water pump for generator engines.
The results showed that it was possible to control the discharge of these pumps, so that the temperature difference amd delivery pressure were kept constant all the time. These systems could save the electric power consumption. In the case of the cooling sea water pump for main engine, the cost of equipment could be offset from the saving of the running cost in approximately 2 years, also the cooling sea water pump for generator engine, 0.6 years. These were suitable for small-powered pump unit (5.5-7.5 kW ) on fishing vessels, these methods also could be widely introduced to fishery machines.View full abstractDownload PDF (855K) -
Takeshi Katagi, Toshiaki Sugishita, Masatsugu Kimura, Takeshi Hashimot ...1991 Volume 26 Issue 11 Pages 629-633
Published: November 01, 1991
Released on J-STAGE: May 31, 2010
JOURNAL FREE ACCESSNow in the marine engineering system, there remain the problem how to communicate the information between the less engineer and the complicated engine plant. In order to overcome the above, we would like to proposed a new management system using database. This system was arranged the documents, the chief-engineer's log book, the chief-engineer's condensed log book, the trouble and mainetenace record, the management report and the marine engine condition report for making the communication smooth with the analysing for the accumulated data.
We constructed a system which has 6836 samples, having 81 items, from the chief-engineer's condensed log book of the training sail ship Nippon-maru I having main engines operated during 55 years from 1930. From the result of analysis for 1554 field-data about the exhaust valves in the main engine, it is shown that we could get the total occurrences of preventive maintenance and the mean time between preventive maintenace.
This system can provide the engineer with the following effective date, mean time between failures, failure rate and maintainability easily.View full abstractDownload PDF (614K)
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