Control

Question 1

Draw and explain a typical ship board application for proportional plus integral action?

Answer 1

Engine jacket water cooling. The integral removes the offset but because reaction time isn’t important, differential control is not required

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Question 2

Explain a cascade control system?

Answer 2

When two parameters are monitored on the same system. This is also known as a master and slave controller

Question 3

Explain a split range control system?

Answer 3

Where there is one measurement but more than one manipulated variable

Question 4

Provide an example of Feed forward Control?

Answer 4

If the engine speed increases then the steam valve will start to
increase the heat energy input to the fuel in anticipation of an increase in fuel flow but before the viscosity sensor has detected a change in the fuel’s viscosity as a result of the increase in flow. Control has become proactive rather than reactive.

Question 5

Explain Kinetic Control?

Answer 5

Kinetic control is used to moderate or regulate potentially unstable fast moving processes such as speed, voltage control, dynamic positioning. Therefore, they are designed to react rapidly to constantly changing, fast moving, variables. A classic example of kinetic control is the engine governor.