Trans RINA, Vol 157, Part C1, Intl J Marine Design, Jan - Dec 2015


the display areas for information devices (see


important a Figure 21)


nd less important


ergonomic condition is that the operator’s eyes should be within the display opening pyramid, i.e. within the area, from which the display inffo This situation can be analyse check the perceptibility o Figure 23).


ormation can be recognized. ed with RAMSIS in order to of display information (see


Figure 21: Analysis of display information plac with respect to the gaze field of the operator


cement


Figure 23: Analysis of display opening pyramids with respect to operator’s position


The ergonomics of displays are affected by the acuity of the display characters and symbols. This is depending on the visual capabilities of


the operator, the size of the


characters and symbols and on the distance betwe en operator and display. The complete situation can be analyzed by RAMSIS through simulating the look on a specific character position of the display and generating of


corresponding test charactters for 4. DISC


(Figure 24). USSION


different levels


recognition (minimum, opttiimal, recommended). These test sizes can be checked against the current displ ay character sizes


The Hierarchic al Task Analysis (HTA) of the navigation of the WFSV was carried out by marine Human Factor researchers with qualified crew background. This offered unique user insights and ha the bridge layout anthropome


Figure 22:Vision shift time isochrones to cluster time


critical display positions (Observer view upper, operator vision lower)


Another cluster method for display areas is to use vision shift time isochrones. Starting from th e current operator’s point of fixation the isochrones provides regions for vision shifts within the same required time (see Figure 21). Time critical displays should be placed within smaller isochrones. displays


In designing and positioning optical in bridge configurations the optical display


properties should be taken into account to ensure a decent perception from the operator’s position. A basic


aim of oject is to engage in the of Dynamic


RAMSIS, and the analysis of the readability of display screens using RAMSIS Cognitive Toolbox. T he this ongoing proj


as informed the objectives of etric analysis using DHMs in the


multidisciplinary approach of Marine Design in order to optimise the bridge layout and information displays of a WFSV, while minimising the design development costs. Achieved through the


integration


NAVigation (DYNAV) practices, to inform an optimis ed information architecture and decision system, and the implementation of DHM an is a Transfer of Innovation fr


where it has demonstrated a reduction in development costs of more than 50%, thrrough a reduction in vehicle development timeframes by a factor of 3 to 5.


nalysis using RAMSIS. DHM from the automotive industry,


© 2015: The Royal Institution of Naval Architects


C-155


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