Hydroelastic Effects on Hull Girder Deformation in Bow Flare Water Impact

Abstract

Slamming loads are important in the structural design of high speed vessels. Slamming can cause global and local effects on the ship structure. Here global effect of slamming (bow flare water impact) means whipping considering hydroelasticity investigated. Considering ideal, non-viscous and non-compressible fluid, bow flare impact loads is developed after determination Bow flare impact forces, with considering of proper beam model and exerting condition due to hydroelasticity, new form of beam deflection model is derived. In deriving of the beam deflection equation, hydroelasticity is considered, thus solving beam equation leads to hydroelastic analysis of bow flare slamming. Finite difference method is used for solving this equation. In order to validate the computation of results, the third party software ANSYS is used. The ship hull girder is represented by a uniform one-dimensional beam that is supported by a uniform elastic foundation. Time depending load is applied as a pressure on end beam and deflection is calculated.

Keywords

• hydroelastic - bow flare slamming force –hull girder beam– finite difference method - transient analysis