... otc 14303 ddf offshore technology conference riser thomas berge johannessen heave response keel plate otc 14303 excitation force natural period deep draft floater motion heave Copyright 2002, Offshore Technology Conference This paper was prepared for presentation at the 2002 Offshore...

... period heave response platform instability equation amplitude frequency model test fpso excitation mathieu instability floating production system excitation force motion response upstream oil & gas spar platform alternative shape heave motion wave period moonpool subsea system...

... experimentally measured excitation forces in irregular waves with corresponding forces obtained by a synthesis based cm the experimentally determined quadratic transfer functions. The conclusions are that in low seastates (4 m significant wave height and less) the springing excitation on the TLP is dominated...

... properties defined in the wave reference system are transferred to the global structural reference system using the following transformation matrix. (c) In order to calculate wave excitation forces and moments acting on the individual members of the structure the wave properties defined in the global...

... a Green's function and digital computer calcu- lations to determine the excitation forces and moments as well as added mass and damping coef- ficients for floating bodies. The analysis is carried out within the framework of linear the- ory for bodies of arbitrary shape, either sub- merged or semi-submerged...