Anti-motion effects of RCS is large remarkably. So it is expected that RCS will contribute toward keeping vessels comfortable after this.
7.5 Engine Room Operator Assisting System for Motor Ships5)
Kawasaki Heavy Industries, Ltd. have developed engine room operator assisting system for motor ships. This system has been developed for easy operation and proper maintenance of principal machinery on motor ship. Operator can easily recognize the running condition, the performance and their transition of these machinery by recording, analyzing and diagnosing the data from the engine monitor and using the portable measuring equipment for the combustion pressure and others.
This system consists of data logging computer, portable measuring equipment for the cylinder pressure and others of a diesel engine and personal computer as a central processing unit for these data. The softwares consist of three independent analysis soft wares and a diagnosis software. The former three softwares are for the purposes of analyzing the data trend of the engine parts, analyzing the cylinder pressure data or diesel engine and analyzing the several data of diesel main engine. The user can select and install some of them on this system. The latter software is for purpose of diagnosing. Only answering some questions by Yes or No according to the results of the former soft ware, operator can get the diagnosis results. This system adopts the general personal computer as data processing unit on purpose. So it is able to apply software which user developed.
As thus system can be complete by adding some apparatus, not only new vessels but also previous ones can be mounted and it can be applied to main diesel engine and generator diesel engine. Now this system is mounted many vessels as engine room operator assisting system. In addition, this system becomes main apparatus of "Marine engine training simulator JETS- 101". This simulator is installed on training ships and training houses as the educational training facilities of the maritime high-school. JRCS Corporation takes charge of sales operation of this simulator.
References
1) Refrigeration, vol. 72 No. 837 (1997.7) pp. 683
2) Refrigeration, vol. 72 No. 833 (1997.3) pp. 204 and Amefrec Technical Reports & Catalogue
3) The Hitachi Zosen Technical Review, Vol. 58 No.2 (1997.7) pp. 94
4) Kawasaki Technical Review vol. 135 (1997.10.) pp. 27 and Vol. 126 (1995.7) pp.3
5) JRCS Corporation Catalogue and Kawasaki Technical Review Vol. 112 (1992.1) pp. 104
[Nobukazu SHIMADA]
8. Deck Machinery
In the section of deck machinery in 1997, the studies and developments to control the several oscillation and vibration generated on large crane barge and container crane were carried out mainly.
The further details of these are as follows.
8.1 Development of Damper to Stabilize Load suspended from Floating Crane1)
Ishikawajima-Harima Heavy Industries CO., Ltd. has developed active oscillation damping system for use on sling frame of the hook of a 3000 ton crane barge to handle caissons in the construction of Shira-Shima Petroleum Depository. In this development, measurement of an oscillation of an actual ship on sea, research on oscillation mechanism of sling flame and logical study of damping effect by oscillation damper were performed. Furthermore water tank tests were carried out using a one forth scale model.
The crane barge is 94 m in length, 40 m in width, 3.8 m draft, 14,645 ton in weight and 11.8 m in height of center of gravity. The shape of this barge is shown in Fig. 8.1. The active damper has damping weight of 35 ton, effective stroke ±2.0 m, maximum velocity of 2 m/s and electric motor of 132 kW as basic specification. The structure is shown in Fig. 8.2. Setting on this damper on sling frame of the crane barge, pendulum motion of the cargo is reduced. In the tests using an actual crane, it was known that horizontal oscillation of the sling frame increases large simultaneously with a cycle of rolling of the barge, and fight and left oscillation amplitude becomes 3 times than the back and forth.
Fig. 8.1 Floating Crane Arrangement
