Fig. 6 Shioji Maru
The authors made the simulation model for this system, and confirmed the accuracy with comparing with the result of experiment. Fig.2 shows the block-diagram of simulation model and the parameter K or T are decided adequately from the result of experiments.
3.2: DDVC System
The experimental system with DDVC system is shown in Fig. 4. In this system, DDVC actuator is attached at the end of fuel rack. On the fuel rack, governor is attached at another end, and it is used usually but when DDVC System were used, the governor would be set at stand-by position.
The control signal for DDVC system is given from the control computer.
The simulation model, which was used to confirm the performance of DDVC system, is same as the conventional system on block diagram. The difference is that DDVC System has smaller dead time and time constant than conventional system.
4. SIMUIATION AND EXPERIMENTAL RESULTS
4.1 Confirmation of Simulation Model
To confirm the appropriateness of simulation model, we compared the results of simulation with the results of experiments and made the parameter adjustment.
Fig.7 shows the results of simulation and experiment for step response with same axis. This result shows good coincidence and accuracy of simulation model.
4.2 Experimental Results
As the first step of experiments, the authors measured the data concerning with engine revolution control with conventional governor in rough sea condition. The results are shawn in Fig.8 and Fig.9.
Fig.8 is the result of experiment of revolution control with conventional governor under the disturbance in rough sea.
Fig.9 is the result of experiments of revolution control with conventional governor. The difference of these results is that the former shows the disturbance with engine torque and the latter shows it with ship motion.
Fig.10 shows the results of experiments with improved control algorithm using conventional governor equipment. It shows that the improvement of control performance is possible with control algorithm.
Fig. 7 Step Response of Main Engine Revolution
