The General HydroStatics Dynamic Stability "DS" Module is a complete analysis solution for conducting dynamic stability evaluations according to IMO Second Generation Intact Stability guidelines. The module interfaces with the Advanced Features (AF) and SeaKeeping (SK) Modules to offer level 1 and level 2 support for all five dynamic failure modes: Dead Ship (DS), Excessive Acceleration (EA), Pure Loss of Stability (PL), Parametric Roll (PR), and Surf-riding/Broaching (SB). New and existing designs may be easily assessed for dynamic stability vulnerability using an intuitive and direct syntax via the DYNSTAB command.

Each failure mode is described below:

• Dead Ship (DS): DS failure mode considers a ship that has lost power and is positioned in beam seas, rolling and drifting under the action of wind and waves.
• Excessive Acceleration (EA): EA failure mode considers the vulnerability of a ship to large lateral accelerations due to synchronous resonance. Lateral accelerations are computed at locations where crew or passengers are expected to be present.
• Pure Loss of Stability (PL): PL failure mode considers the vulnerability of a ship to capsize via complete loss of stability due to a sudden and significant change in waterplane in the action of waves.
• Parametric Roll (PR): PR failure mode considers the vulnerability of a ship to parametric roll resonance in waves.
• Surf-riding/Broaching (SB): SB failure mode considers the vulnerability of a ship to surf-riding, during which a following wave accelerates a ship forward, and broaching, which is a violent uncontrollable turn that often follows surf-riding and may cause stability failure.

Implementation of the IMO Second Generation Intact Stability Guidelines
Abstract: This paper provides a discussion of the technical and theoretical ambiguities, requirements,and limitations to develop a practical implementation of the IMO Second Generation Intact Stability criteria.

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