Ship unsinkability calculation approach based on panel method
[Objective]As the ship unsinkability calculation method based on two-dimensional slicing has such problems as limited modeling ability and insufficient applicability to complex ship types,this study pro-poses a panel method-based ship unsinkability calculation technique based on a three-dimensional fully-appen-ded ship model.[Methods]Adopting a discrete three-dimensional triangle panel model,the normal direc-tions of the ship panels and damaged compartment are set opposite each other so that their buoyancy cancels each other out and causes buoyancy loss.A watershed transformation algorithm is used to achieve the match-ing of wetted surface panels in any floating state.Based on the Gaussian formula,the integration of displace-ment volume is transformed into the integration of wetted surface area,and the displacement volume and wa-ter plane elements are further solved through the panel projection integration method.Newton-Raphson meth-od is then used to calculate the floating state of the damaged ship and conduct an unsinkability evaluation.[Results]Taking the Wigley numerical ship model and standard ONR(Office of Naval Research)tumble-home(ONRT)ship model as examples,the accuracy of the algorithm is verified and an unsinkability evalu-ation is conducted for the ONRT fully-appended ship model.[Conclusion]The calculation example shows that the proposed method has reliable calculation accuracy,strong applicability to complex ship types and practical engineering value.
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