Abstract
Aluminium patrol boats have been designed for operations under severe conditions. The ship hull must withstand high global and local stresses in rough sea conditions and the aluminium structural details must not fail due to fatigue. The speed of the ship and the hull shape may increase the probability of wave impacts and the hydroelastic structural behaviour with which the wave loads exite hull vibration in the lowest eigenfrequency, which considerably increases the number of load cycles. In predictions of wave loads and structural behaviour for design purposes, non-linear wave loads and hydroelastic structural behaviour must be taken into account. The use of traditional linear frequency domain analysis leads to severe underestimation of maximum hull girder stresses, stress ranges and also the number of load cycles. This has been confirmed by global stress measurements during sea-keeping trials. A numerical simulation procedure base on the non-linear strip theory has been developed for time-domain analysis of wave loads and structural response. The procedure takes into account, in an approximate way, non-linear wave loasd due to rarge ship motions. The structural analysis model includes the dynamic structural behaviour. The post-processing of the simulated rasults has been developed for application in structural design work. The calculated results include, for example, prediction of maximum responses and rainflow cycle count processing of stress ranges. The procedure was applied to simulate an aluminium patrol vessel in sea conditions corresponding to the sea-keeping trials. Global stress measurements in sea conditions where wave impacts on the hull occurred frequently. Simulated results were compared to these experimental full-scale results. Theoretical results showed reasonable correlation with experimental data.
| Original language | English |
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| Title of host publication | Hydroelasticity in Marine Technology |
| Subtitle of host publication | Proceedings of the 2nd International Conference |
| Editors | M. Kashiwagi, W. Koterayama, M. Ohkusu |
| Publisher | Yomei Printing Cooperative Society |
| Pages | 477-484 |
| ISBN (Print) | 978-4-87780-001-7 |
| Publication status | Published - 1998 |
| MoE publication type | B3 Non-refereed article in conference proceedings |
| Event | 2nd International Conference on Hydroelasticity in Marine Technology - Fukuoka, Japan Duration: 1 Dec 1998 → 3 Dec 1998 |
Conference
| Conference | 2nd International Conference on Hydroelasticity in Marine Technology |
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| Country/Territory | Japan |
| City | Fukuoka |
| Period | 1/12/98 → 3/12/98 |