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D: Model Testing [Table of Contents] E: Load Effects in the Tendons

DNV-OS-C105 Structural Design of TLPS (LRFD method)

[-] Sec.5: Global Performance
[-] D: Model Testing
[-] D100: General

Sec.5
D 100   General

Sec.5 D
101   Model testing will usually be required for final check of TLP designs. The main reason for model testing is to check that analytical results correlate with model tests.

Sec.5 D
102   The most important parameters to evaluate are:
—air-gap
—first order motions
—total offset
—set-down
—WF motions versus LF motions
—tendon responses (maximum and minimum)
—accelerations
—ringing
—springing
—susceptibility to hull VIM.


Sec.5 D
103   The model scale applied in testing shall be appropriate such that reliable results can be expected. A sufficient number of seastates need to be calibrated covering the relevant limit states.

Sec.5 D
104   Wave headings, multidirectional sea, tests with wind, wave and current, wave steepness and other variable parameters (water levels, vertical centre of gravity, etc.) need to be varied and tested as required.

Sec.5 D
105   If HF responses (ringing and springing) shows to be governing for tendon extreme and fatigue design respectively, the amount of testing may have to be increased to obtain confidence in results.
D: Model Testing [Table of Contents] E: Load Effects in the Tendons