Ship autopilot control system

Demanded rudder-angie Measured rudder-angie 

In order to design and implement a eontrol system the following essential generie 

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Fig. 1.13 Block diagram of ship autopilot control system.

Fig. 4.38 Unit step response of ship autopilot control system. RiseTime (to 95%) = 23 seconds ...

Case study example 4.6.3 (Ship Autopilot Control System)... 

A control system may have several feedback control loops. For example, with a ship autopilot, the rudder-angle control loop is termed the minor loop, whereas the heading control loop is referred to as the major loop. When analysing multiple loop systems, the minor loops are considered first, until the system is reduced to a single overall closed-loop transfer function. 

Richter, R., Burns, R.S., Polkinghorne, M.N. and Nurse, P. (1997) A Predictive Ship Control using a Fuzzy-Neural Autopilot. In Eleventh Ship Control Systems Symposium, Southampton, UK, 14-18 April, 1, pp. 161-172. 

The method of switching between the two modes of work was also used in other types of autopilots such as the Shding Mode Control (SMC). This method describes the optimal controller for a broad set of dynamic systems and is suitable for control of a non-linear plant. It does not need to be precise and it is not sensitive to parameter deviations. The SMC for ship course control is proposed by Tomera (2010), Yaozhen et al (2010). 

In the ship autopilot systems there are also adopted internal model control (IMC). The difference between the IMC and single-loop systems lies in better prediction capabilities of the IMC approach. 

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