This type of analysis is suitable for fatigue calculations and preliminary analysis.
It is based on the assumptions that:
- The variations in tether tension are small, therefore, the tether tension stiffness does not change with time.
- The loads on the tether are assumed proportional to the response, which requires a linearisation of the drag loading on the tether and on the hull.
With these approximations the tether response to regular waves can be solved in the frequency time domain and spectral analysis techniques can be used to determine the response statistics in a sea.
Frequency domain analysis may use:
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