A Dynamic Point is a moving point that is not associated with a Part.

Unlike Fixed Points and Connection Points, Dynamic Points introduce additional equations of motion to the hydrodynamic solution and therefore must have their own mass and rotational inertia defined. They can also include hydrodynamic properties such as linear stiffness, added mass, damping and Morison drag.

Dynamic Points can be used to represent something physical such as the shackle on a bridle mooring, or a derrick hoist block; or they can be used as a modeling tool such as a reference structure in the time-domain user-defined force function. The mass and hydrodynamic properties assigned to a Dynamic Point can also represent something physical such as the mass and drag of a linear cable (which is otherwise without mass or drag) or they can be abstract.

Dynamic Points do not comprise any surfaces so they do not have frequency-dependent hydrodynamic properties. They are included in the Hydrodynamic Diffraction analysis because they must be written into the hydrodynamic database generated by the Aqwa solver. However, you cannot review any results for Dynamic Points under the Hydrodynamic Diffraction Solution as these results would not have any physical significance.

The initial position of a Dynamic Point is defined in the same way as a Fixed Point or Connection Point. Then, when setting the Connections, the Dynamic Point can be selected in place of a Connection Point. For example, a Cable with structure-to-structure connectivity could either be defined between two Dynamic Points, or a Connection Point and a Dynamic Point. A Dynamic Point can be used by more than one connection (Cable, Fender, and so on). For steps on adding and defining Dynamic Points, see Define Dynamic Points.

In the setup of a Hydrodynamic Response analysis, you can apply Deactivated Freedoms, Starting Conditions, Point Forces and Structure Forces to a Dynamic Point, in the same way that you would for a Part.

Similarly, in the results of a Hydrodynamic Response analysis, the Dynamic Point can be considered as a structure. Meaning any result that can be generated for a Part such as a graph plotting Structure Position vs Time can also be produced for a Dynamic Point.