The data records described in this section define an additional structural (i.e. not hydrostatic) stiffness, that may act on one structure or may connect two structures. The additional force acting on the structure(s) is defined as
where
| X(e) is the equilibrium position, defined on the SPOS data record |
| F(e) is the force at the equilibrium position, defined on the SFRC data record |
| K is the stiffness, defined using SSTF data records |