Trans RINA, Vol 157, Part C1, Intl J Marine Design, Jan - Dec 2015 5. Divide sub goals


6. Outline the how the goals are achieved in relation to each other.


The on-board visit/observations took place on a CTV which was


chartered for


Vattenfall; performing its duties on the DanTysk off wind farm west of Esbjerg (DK). There were three crew members who belonged to the vessel. On that day for the observation there were e leven technicians coming out for conducting work in the wind farm, which were fifty nautical miles off the coast.


the wind farm operator ffshore


The Hierarchical Task Analysis (HTA) is a result of the observations, recordings and interviews during operations in the wind farm that day. Mainly the observation took place from the bridge of the concerned vessel, covering navigation to field, different approached cargo


its


to different turbines/floatels and substation, operation at a sub stations was also ob served.


a


The approach to wind turbine is shown in Figure position of the camera illustrates more or less the view of the


when evaluating approach


5, the visual


e master. Visual confirmation is leading for


action and control of the vessels position in relation the boat landing. Important aspects here are wave heights and direction also strength and direction of the current is important


direction.


Preparation for technician transfer is shown in Figure 6, where a crew member is assisting with the safety line, with the technician transfer shown in Figure 7.


The layout of bridge forward console (Figure always the in the line of sight of the captain navigating between turbines. Figure 9 shows the c manoeuvring the vessel against the turbine, his left hand operates the main propulsion and his right the rudder, the bow thrusters are seldom used.


8) is when


captain


The top level task of the HTA (which is simplified i in this paper) is shown in figure 10. The take away message on this level to be used in the UCD process is the four main rew is engaged in at the bridge which are :


tasks the cr


1. Na 2. Na 3. Na 4. M


avigation in restricted water inshore avigation in open water


avigation the approach to installations anoeuvring close to physical objects.


The requirement for all without co


ompromising the ability


those four tasks must be met to perform another.


Without a structured methodology like UCD this might not be considered and thus the system as a whole sub optimized with increased risks of accidents as a natural consequence.


Figure 8: Layout of bridge forward console Figure 7: Technician transfer Figure 6: Preparation for technician transfer Figure 5: Approach to wind t turbine


© 2015: The Royal Institution of Naval Architects


C-151


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