QTF Coefficients |
 
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QTF Coefficients |
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The QTF data is divided into groups, with each group providing data for a particular wave frequency. Each group consists of the following lines:
FREQ=Wave frequency (in Hz)
Relative floating body/wave heading, QTFy, QTFz, QTFθ
Line 2 is repeated until QTF values are specified for all headings for this wave frequency. Then a second FREQ= line signals the start of the next group of values, and so on until values for all wave frequencies have been input. Relative floating body/wave heading in this context is defined as the angle of incidence of the wave relative to the floating body axes; refer to Definition of Wave Heading for QTF Data for a more detailed definition. QTFy, QTFz and QTFθ are respectively the QTF values in surge, sway and yaw at a particular frequency.
•*QTF is used to specify Quadratic Transfer Functions (QTFs) that allow the slow drift loads on a floating body or moored vessel to be determined.
If you would like to see an example of how this keyword is used in practice, refer to D01 - Moored Vessel.