Hydro dynamic spring > Input Parameters
Definition and modification of the stiffness parameters of "Hydro dynamic springs" (SHydro)
The Hydro-dynamic spring is simulating the interaction between structure and submerged floater and it is used for dynamical time response calculation of floating bridges. Interaction is modeled as participation of radiation wave damping R(t) and infinite added mass Mhydro imported via excel file. Hydrostatic stiffness Khydro is diagonal matrix and it should be modeled as zero spring that connects floater with zero node of surrounding fluid.
Radiation damping and added mass are modeled as fully coupled 6X6 matrices. Members of added mass matrix are symmetric and members of frequency dependent damping matrix are non-symmetric. Excel data are transformed from AQWA (right hand) to RM (left hand) coordinate system. More details about input and calculation can be found in the Analyzer User Guide under chapter Hydro-dynamic spring.
The name of the used Excel file should be defined in the field TDA (AQWA) file format
| Setting | Description |
|---|---|
| From/To/Step | Element series, for which the section properties are input/modified. |
| Element type | T Hydro-dynamic spring (SHydro): Name of the advanced spring. An other element type can be selected by pressing the arrow . According the chosen element type the input pad will be changed. |
| Aero class / EccType | Irrelevant in this context |
| Cx, Cy, Cz | Hydrostatic stiffness in local coordinate system; DOF of displacements. |
| CMx, CMy, CMz | Hydrostatic stiffness in local coordinate system; DOF of rotations. |