Simplified Steering Ability Assessment Sample Clauses

Simplified Steering Ability Assessment. The starting point is system (16)-(18), solved for all relevant forward speeds and all seaway directions to check that the ship is able to start or continue course change in seaway from any direction. Note that for the steering ability, both the steering system and propulsion (which influences steering ability) are required and should be integral parts of the assessment: e.g. ships with powerful propulsion may have a smaller rudder, whereas ships with weaker propulsion may compensate this with larger or more effective steering devices. Results of Comprehensive Assessment for many ships show that the dimensioning condition for the installed power, i.e. the condition at which the ratio of the required to available delivered power is maximised along the line of maximum steering effort (further referred to for brevity as critical condition for steering) is close to beam seaway, Figure 54, right. Note that from experience, as well as from the results of Comprehensive Assessment for many ships, critical conditions for steering occur most frequently in xxxxx quartering waves, like in Figure 54, middle; however, in such situations the required power is less than the required power defined by the Propulsion Ability, i.e. by the crossing point of lines A and B. When the Steering Ability is dominating for the definition of the installed power, i.e. when line A crosses line C, the critical conditions are always close to beam seaway situations. This allows reducing the evaluation of the time-average wave and wind forces to beam seaways. The second simplification stems from the observation that the levers of time-average wave and wind yaw moment are negligible compared to the lever of the calm-water yaw moment in critical conditions for steering. Note that the simplifications made restrict the Simplified Steering Ability assessment to the vessels with conventional steering devices arrangement at the xxxxx (including azipods); vessels equipped with azipods at the bow require Comprehensive Assessment. As a result, the system of equations (16)-(18) reduces to one equation X  X 90  X 90  X  T (1t )  0 s w d R H and one check R w d Y  bY 90  Y 90  where b  N 's  N 's  0.5Y 's  . To define the components of forces and moments X s , X 90 , Y 90 , X 90 , 90 and X R in the Simplified w w d Y d Assessment of Steering Ability, any of the methods used in the Comprehensive Assessment can be applied; in addition, application of simplified empirical formulae seems suita...
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Related to Simplified Steering Ability Assessment

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