Ship motions are influenced by the sea state. Conventionally the responses are
calculated in the frequency domain. This method, however, is valid only for narrow
band spectra. As the seaway becomes more nonlinear, the ship motions cannot be
readily predicted using the spectral method. Experiments conducted by Dalzell, have
shown that the Response Amplitude Operator (RAO) decreased with increasing sea
state or non linearity. Conventionally in the shipbuilding industry, the ship motions
are studied by the linear RAOs and the energy density spectrum of the seaway. This
method does not take into consideration any non linearities in the system. These
are ignored and the ship seaway system is modeled linearly. The following work
analyzes ship motions in the conventional linear approach and compares it to time
domain simulations using the technique outlined in the work, viz. UNIOM (Universal
Nonlinear Input Output Method). Time domain simulation of the SL-7 container ship
hull is carried out. A comparison of the most probable peak value of the different
modes of motion indicates that the linear theory tends to overpredict.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/5848 |
| Date | 17 September 2007 |
| Creators | Padmanabhan, Rajith |
| Contributors | Kim, Cheung Hun |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | 2647517 bytes, electronic, application/pdf, born digital |
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