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INTERCEPTOR DESIGN AND CONTROL FOR THE HIGH SPEED CRAFT 31

5.6 Actuator Control

As the chosen actuator for the reference design, Thomson Max Jac actuator has available input
voltages of either 12V or 24V. In this case 12V version is chosen, and e.g. for 50 mm stroke
length, if desired actuated length is 25 mm then PWM signal should have 50% duty cycle,
which will have a 6V average.

6. Marine Systems Control

Control systems can be used for many automation requirements/demands, such as;

 To give the autopilot a heading direction:
While rudder position and steering gear will be controlled according to compass
measurements, external disturbances or changes in the conditions for example;
wind/wave conditions, ship draught and water depth may interrupt this progress.

 To maintain cooling water temperature of a diesel engine:
Coolant flow will be controlled with flow control valves according to the readings
from the thermocouple at diesel engine cooling water outlet. Meanwhile engine load
variations and sea water temperature variations may disturb this process.

 To maintain diesel generator engine speed and electrical frequency:
Fuel pump/governor will be used to control engine fuel flow according to the
measurements from the tachometer, while the electric load and ambient conditions
may vary thus causing external disturbances. [23]

Above examples can be varied furthermore, since marine crafts have many equipment and
systems.

7. Interceptor Control

By having required components and sufficient programming knowledge, one can prepare an
interceptor control project.

Components can be exemplified as below;

 Pair of Interceptors
 Pair of Actuators
 DC Power Source
 Microprocessor
 DC Motor Driver
 GPS
 Accelerometer
 Gyroscope

In this case; interceptors are custom-engineered, actuators are supplied from a manufacturer,
vessel’s generated power can be used as the power source, an arduino or two can be used as
microprocessor (or Raspberry Pi, PIC devices or a PLC device such as Siemens S7-1200),

Sayı 7, 2016 GiDB|DERGi