Experimental analysis of wave-induced vertical bending moment in steep regular waves

Recent studies have benchmarked the prediction of wave vertical bending moment (VBM) ships in waves and found significant scatter among numerical codes. A long series tests with segmented hulls been reported literature over past 70 years to assess moment. However, alongside improvement tools modeling ships’ internal loads, scientific community still requires accurate experimental data measured steep (ratio height H wavelength ? , H/ = 0.1) where ship behavior loads are modified by non-linearities. Thus, order validate simulation codes, establish criteria requirements that make safer sail severe sea conditions, some experiments were carried out 50 m × 30 5 hydrodynamic ocean engineering tank Ecole Centrale Nantes. 1/65th scaled model a 6750-TEU containership was used. The moored several combinations tested. present performed on hull 6DOF load sensor located close amidship, measurements available from previous studies. design, which did not use strain gauges, done specifically increase first structural mode frequency stiffness reduce it possible filter hydro-elastic effects. motion through Qualisys IR tracking system accelerometers fore aft beam. Also, each 9 segments is equipped 3DOF dynamometer measure hull. mathematical description relations between forces given paper. This makes retrieve then compute shear force discretized at intersegment all length. Particular care paid reproducibility repeatability tests. setup presented Hydrodynamic reconstructed obtained VBM compared measurement. non-linear effects increasing steepness motions discussed.