What with the massive increase of world shipping, there is a deficit of trained officers and engineers. In response shipping companies in Japan are recruiting yet more foreign crews. It is thus crucial to raise training in a short time. The usually method is by lecture and OJT, but these have their limitations. Simulators are believed to be more effective in training engineers. However, diesel plant simulators are few, and there is only one full-mission type marine diesel plant simulator in Japan. This is because of its relatively poor cost performance. To improve this we have developed a new diesel plant simulator, and that can be used for training not only cadets but also chief engineers. In this report, the overall view of the simulator and related, new technologies is introduced.
Today's Engine Room Simulators (ERS) are using the full potential of the latest advances in hardware and software development. Having reached this peak, simulator manufacturers are now channelling efforts into new ways to improve the pedagogical value of their systems, by improving flexibility for the student and the training organisations, and by enhancing the control of ERS instructors.
A secondary motion of the piston in the large crosshead diesel engine was measured. The piston moves in the cylinder to Cam-Exhaust direction, and also to Fore-After direction. The factors affecting on the motion are discussed.
This paper concerns the SCR (Selective Catalytic Reduction) for NOx emission reduction on the MAN B&W two-stroke diesel engine, used for marine applications. There are clear limitations in practice; this was well demonstrated. The latest development with alternative“internal methods” (in-engine methods) to reduce emission will also be described. Especially, our expectations for other than SCR, NOx reduction methods are described. We are confident that internal methods; like EGR, WFE, HAM/SAM, and/or combinations of these internal methods will bring our two-stroke engine to a position to fulfil coming IMO Tier 3 regulations; those regarding NOx emission. This is before the due time fore the IMO Tier 3 to come into force. These methods work without using agents, such as urea or ammonia. Compared to SCR some of these new methods have other advantages. As opposed to SCR, low-load operations are possible as exhaust gas temperature limitations are eliminated.
The capability of technological development for the deep sea submergence vehicles of Japan had been badly behind that of the USA and Europe until the 1970s. From the 1980s through to 2000, Japan put its energy into this area, and so jumped to top in the world by the development of manned submersibles“SI IINKAI 2000”and“SHINKAI 6500”. The“SHIN 6500” was launched in 1990 and has held the deepest diving capability in the world ever since. Remotely Operated Unmanned Vehicle“KAIKO” [launched in 1995] can dive to the deepest point in the oceans, 11000m. There is no other vehicle with this capability; that is for the time-being. There are currently very few further domestic technology development plans in Japan. Instead, the initiative seems to be shifting to such countries as the US, China and Korea. This paper describes the recent trends concerning the technology and its development internationally.
Recently, the regulation of the diesel engine (DE) exhaust has become stricter due to environmental considerations. It is now required to take countermeasures against DE exhaust on the material handling of equipment in the container terminal. Mitsui Engineering & Ship Building Co., Ltd. (MES) has proposed to the market a solution for DE exhaust of Rubber Tired Gantry Crane (RTG) and has developed a combined system of Diesel Particulate Filter (DPF) and NOx Reduction System (DeNOx) . A Continuous Regenerating Trap method is newly applied for DPF. An Urea Injecting SCR method is used to improve the DeNOx performance of the system. With these new methods, a target reduction rate of 50% for PM, and 80% for NOx have been achieved. This confirmed by measurement and analyzing field data of the RTG in operation. The system was mounted on the RTG and its durability and reliability were verified through the pattern test for each operation mode, and throughout 1, 500 hour operations. In 2006 MES acquired the certification of DPF from the U. S. Environmental Protection Agency (USEPA) and the California Air Resource Board (CARE) . In 2007 orders were placed by the Port of Los Angeles (POLA) .
Contra - Rotating Hybrid Type Rudder Propeller is of the new development-type hybrid device ZP-41RP. It was installed in one of the overseas research purse seiners“Nippon-Maru”. The device consisted of one electromotive motor drive rudder propeller device belonging to in a conventional main engine drive variable-pitch propeller; and to the rear for a contra-propelling effect. We therefore here introduce the summary of the Contra - Rotating Hybrid Type Rudder Propeller.
Safe operation of a ship engine plant is maintained using a continuous monitoring system and periodic inspection and maintenance undertaken several times daily. When monitoring and maintenance work are executed to judge the state of equipment, an operator uses data from measurement instruments and detects the operating sound of an engine and the hammering sounds from contact using a testing hammer. The hammering inspection using the testing hammer, which is a general check method in routine maintenance work, is used not only for marine engines but also for various machines on land. In those machines, to prevent accidents, checking before engine starting is performed routinely, but many accidents caused by loose bolts and similar malfunctions are reported. For this study, an experiment was performed while the fastening power of bolts in the connecting rod was variously changed. Sounds generated when bolts are hit with the testing hammer were recorded at that time. An operator heard the hammering sound. The means by which the operator judged the fastening power by the hammering sound were investigated using a questionnaire. In addition, the hammering sound was made into data, and calculation of the fastening power was assessed using statistical analysis based on the above data. Consequently, a multiple regression formula with high accuracy was obtained for particular bolts used for this experiment. Results clarified that the fastening power can be estimated from the hammering sound.
Monitoring of combustion in a cylinder is getting important to operate an engine safely and to do most suitable combustion for environment prevention for an electronically controlled marine diesel engine. Generally a pressure sensor installed on a cylinder is used to monitor combustion condition but there are problems such as durability of the sensor under severe environment such as high temperature and high pressure. As new combustion monitoring technology, authors installed a strain gauge on a cylinder head bolt and installed a load washer between a cylinder head bolt and a nut. They are tested by a marine diesel engine and signals from them are analyzed. The signal of the strain gauge or the load washer had strong correlation with the cylinder pressure and it is possible to estimate the ignition time by the signal of the strain gauge or the load washer.
In this study, we investigate the automatic reduction of dimethyl ether (DME) detailed elementary reaction scheme for three-dimensional combustion simulation in DME-fueled homogeneous charge compression ignition (HCCI) engines. This study was conducted using the authors' original software tool“Automatic Scheme Reduction Tool (ASRT) ”. For improving the overall capability of ASRT tool, an additional function was incorporated. While the previous ASRT constructs a reduced elementary reaction scheme in consideration of the rate of heat release, the new ASRT constructs a reduced scheme in consideration of the histories of prescribed chemical species as well. As a result, it has been shown that several DME reduced elementary reaction schemes, whose prediction accuracy depends on prescribed evaluation criteria in ASRT, can now be constructed automatically.
A physical model for a fan spray from a slit injector is proposed. The behavior of a fan spray in a constant volume vessel, and in a direct-injection gasoline engine, has been numerically analyzed by means of the authors' GTT code. By comparing these calculated results with the experimental results, the spray model's validity has been confirmed. Three-dimensional numerical simulation using the GTT code has shown that mixing of air and fuel which has been injected early during the compression stroke progresses better in the case of the inclined swirl flow than in the case of the tumble flow. Furthermore, a modification to the piston head shape can improve the stratified mixture formation.