A wavelet for predicting the time-domain response of vertically tethered systems

Citation
Rg. Lueck et al., A wavelet for predicting the time-domain response of vertically tethered systems, OCEAN ENG, 27(12), 2000, pp. 1441-1453
Citations number
6
Categorie Soggetti
Civil Engineering
Journal title
OCEAN ENGINEERING
ISSN journal
00298018 → ACNP
Volume
27
Issue
12
Year of publication
2000
Pages
1441 - 1453
Database
ISI
SICI code
0029-8018(200012)27:12<1441:AWFPTT>2.0.ZU;2-8
Abstract
The response wavelets for tether tension and the displacement of a package on the end of a tether rue derived from a linear, frequency-domain model of vertically tethered systems using inverse fourier transform techniques. Th ese wavelets are convolved with a record of ship displacement to predict th e instantaneous tension and displacement to an accuracy of better than 20% for a typical system. Although snap loads are non-linear and the response c annot 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 po tentially hazardous conditions are foreseeable with the wavelet and this in formation can be used in real-time to guide operations at sea. (C) 2000 Els evier Science Ltd. All rights reserved.