Direct wave force measurements on a model tension leg platform
A 1:50 scale model of a tension leg platform without tethers was rigidly attached to a five degree of freedom load cell frame. Regular waves with prototype periods of 4.7 to 14.1 seconds were passed through the model. For each wave frequency wave amplitude to wave force transfer functions were measured as a function of incidence angle. Wave incidence angles were varied in five degree increments. Force transfer functions for the five rigid body degrees of freedom in heave, pitch, roll, surge, and sway were measured and compared with numerical predictions. By applying the principle of reciprocity for linear wave forces, these results may be used to calculate the radiation (wave making) damping for motion of the TLP in these five rigid body modes. Furthermore the results may be used to directly estimate the dynamic response at a natural period of the tethered structure in heave, pitch, or roll, including the effects of directional wave spreading. Sample calculations of radiation damping and dynamic response prediction are included.
- Research Organization:
- Massachusetts Institute of Technology
- OSTI ID:
- 5355898
- Journal Information:
- Ocean Sci. Eng.; (United States), Journal Name: Ocean Sci. Eng.; (United States) Vol. 7:4; ISSN OSEND
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
423000* -- Engineering-- Marine Engineering-- (1980-)
AMPLITUDES
CALCULATION METHODS
DAMPING
DYNAMICS
FABRICATION
FREQUENCY DEPENDENCE
FUNCTIONS
INCIDENCE ANGLE
MATERIALS WORKING
MEASURING METHODS
MECHANICAL STRUCTURES
MECHANICS
OFFSHORE PLATFORMS
ROLLING
TRANSFER FUNCTIONS
WAVE FORCES
WAVE PROPAGATION