For an established control system, scan cycle time of the PLC is almost constant during steady operation. Scan cycle time of PLC can be act as a timing unit and realize the function of timer by appropriate programming. The timing method based on PLC scan cycle time is practiced in judgment of start success of generator set and grasping of ACB (air circuit breaker of generator) closing opportunity in automatic synchronization control and achieved the desired results. Application of this timing method reduced the hardware of the control system, improved the reliability and economical efficiency. Several years of operation in training lab proved that this control method is reliable and steady.
The rudder and steering gear is the most widely used ship maneuvering equipment. It consists of the maneuvering device, transmission mechanism, steering gear, steering mechanism and the rudder blade. MV "TANSUO HAO" is a scientific research ship of 30 years old. The scientific exploration missions require a very high accuracy of the ship’s course, so the ship has to constantly adjust her course and steer frequently. On that day, the duty officer found the steering gear failure to turn left in the rough sea condition. The engineering crew members had to make an emergency repair. It took plenty of time to locate the trouble of the steering gear in the repair process, because the valve plate deformation problem on the solenoid reversing valve was very hard to find out. By exploring the obscure steering gear failure reason and special troubleshooting process on MV "TANSUO HAO", this thesis provides some repair experience for the hydraulic system management and proposes flexible and patient failure analysis as well as some preventive maintenance measures against the problem.
Currently shipping costs are increasing sharply due to the rising oil prices. In order to reduce shipping costs, most low-speed two-stroke diesel engines run at low speeds to reduce fuel oil consumption, and this measure might result turbocharger surge. For modern marine diesel engines, the exhaust gas turbochargers are becoming more and more important; their working conditions have a direct impact on the performance of diesel engines, consequently affecting the operation of the ship. Surge will fail a turbocharger to achieve the supercharging ratio, damage the turbocharger components and even lead to a damage accident of the whole turbocharger. Therefore, a good understanding of the reasons for marine diesel engine turbocharger surge will help to prevent and eliminate turbocharger surge in operation. This paper is to make an analysis on the special surge mechanism occurred to the turbocharger on MV "Crystal Star", and propose some appropriate supervisory and preventive measures against the problem.
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