The paper follows contemporary development of the second generation IMO intact stability criteria and describes application of vulnerability criteria for surf-riding / broaching to Systematic Series D parent hull. Model D1 is a semi-displacement twin-screw round-bilge hull by Kracht and Jacobsen (1992) representative of several naval ships built during 90ties. The modern hull form and the complete set of resistance and selfpropulsion results available for the Systematic Series D models offer a possible benchmark case to support scientific community for further criteria verification. More in particular, the Direct Assessment of surf-riding failure mode has been addressed by two approaches. The first one is based on the 1 DoF nonlinear differential equation for surge motion solved analytically and the occurrence of homoclinic bifurcation is examined. The second approach is based on a 6DoF ship dynamics simulation taking into account wave, propeller and maneuvering forces and moments. Instantaneous wetted surface is considered for restoring and Froude-Krylov forces while ship resistance, thrust and maneuvering are based on the calm water performances. Calculations are performed for four ship speeds at the wave with /L = 1 for different wave steepness. A condition where the occurrence of the surf-riding by 1DoF has been verified, is further analyzed by 6DoF, exploring the effect of the nonlinearity in the Froude Krylov force. The limit wave steepness is found for each considered ship speed.
Surf-riding failure mode: from IMO criterion to Direct Assessment procedure and application on Systematic Series D / Acanfora, M.; Begovic, E.; Rinauro, B.. - 1:1(2019), pp. 81-89. (Intervento presentato al convegno Proceedings of the 17th International Ship Stability Workshop tenutosi a Helsinki nel 10 - 12 June 2019).
Surf-riding failure mode: from IMO criterion to Direct Assessment procedure and application on Systematic Series D
Acanfora M.Writing – Original Draft Preparation
;Begovic E.
Writing – Original Draft Preparation
;Rinauro B.Writing – Original Draft Preparation
2019
Abstract
The paper follows contemporary development of the second generation IMO intact stability criteria and describes application of vulnerability criteria for surf-riding / broaching to Systematic Series D parent hull. Model D1 is a semi-displacement twin-screw round-bilge hull by Kracht and Jacobsen (1992) representative of several naval ships built during 90ties. The modern hull form and the complete set of resistance and selfpropulsion results available for the Systematic Series D models offer a possible benchmark case to support scientific community for further criteria verification. More in particular, the Direct Assessment of surf-riding failure mode has been addressed by two approaches. The first one is based on the 1 DoF nonlinear differential equation for surge motion solved analytically and the occurrence of homoclinic bifurcation is examined. The second approach is based on a 6DoF ship dynamics simulation taking into account wave, propeller and maneuvering forces and moments. Instantaneous wetted surface is considered for restoring and Froude-Krylov forces while ship resistance, thrust and maneuvering are based on the calm water performances. Calculations are performed for four ship speeds at the wave with /L = 1 for different wave steepness. A condition where the occurrence of the surf-riding by 1DoF has been verified, is further analyzed by 6DoF, exploring the effect of the nonlinearity in the Froude Krylov force. The limit wave steepness is found for each considered ship speed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
