A wavelet for predicting the time-domain response of vertically tethered systems |
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| Authors: | R G Lueck F R Driscoll M Nahon |
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| Abstract: | The response wavelets for tether tension and the displacement of a package on the end of a tether are derived from a linear, frequency-domain model of vertically tethered systems using inverse fourier transform techniques. These wavelets are convolved with a record of ship displacement to predict the instantaneous tension and displacement to an accuracy of better than 20% for a typical system. Although snap loads are non-linear and the response cannot be calculated while the tether is slack, the onset of zero tension — a precursor to snap loads — is predicted by the wavelet. Thus, extreme and potentially hazardous conditions are foreseeable with the wavelet and this information can be used in real-time to guide operations at sea. |
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| Keywords: | Vertical tethers Wavelets Transfer function Linear dynamics |
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