Ismail, Yonny Ahmad (2016) Analisa Respon Gerak Dan Operabilitas Pada Desain Kapal Survei Seismik Geomarin-IV. Undergraduate thesis, Institut Technology Sepuluh Nopember.
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Abstract
Pemerintah RI tengah merencanakan pembangunan kapal survei seismik baru
melalui Pusat Penelitian dan Pengembangan Geologi Kelautan (P3GL). Dalam
rangka menjamin keamanan dan keselamatan desain kapal baru Geomarin-IV milik
P3GL, diperlukan analisa seakeeping dan mengevaluasi operabilitas kapal untuk
mengetahui batasan kapal mampu beroperasi dengan optimal. Analisa diawali
dengan melakukan komputasi Response Amplitude Operator (RAO) kapal tersebut
untuk 3 (tiga) mode gerakan vertikal, yaitu heave, roll, dan pitch. Selanjutnya RAO
tersebut diproses dalam analisis spektra untuk mendapatkan respons spektra di atas
gelombang acak dengan variasi tinggi signifikan Hs antara 1,0 m hingga 7,0 m.
Hasil komputasi respons spektra dengan variasi Hs dan kondisi pembebanan
dikorelasikan terhadap kriteria seakeeping. Hasil korelasi untuk kriteria operasi
umum menunjukkan batas tinggi gelombang signifikan maksimal mengacu pada
Nordforsk, BV dan Olson, masing-masing sebesar 1,3 m, 1,6 m dan 3,2 m.
Sedangkan untuk operabilitas dengan kriteria helikopter atau transfer barang dan
personil didapatkan batas tinggi gelombang signifikan maksimal sebesar 1,2 m.
Peluang kapal mampu dioperasikan dengan optimal (operable) menggunakan data
sebaran gelombang laut Natuna, berdasarkan kriteria umum Olson diperoleh
sebesar 97,31% tanpa operasi survei seismik dengan down time 2,69%. Dalam hal
survei seismik peluang seakeeping operable kapal sebesar 99,97% dengan kriteria
umum Olson, sedangkan bila mengacu pada kriteria Nordforsk dan BV operabilitas
hanya mencapai 67,95%, atau down time sebesar 32,05%.
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vessel through the Ocean Geology R&D Center (P3GL). In view of assuring the
safety of the new vessel Geomarin IV, seakeeping analysis and operability
evaluation are required to find out the limit where the vessel is capable of to operate
optimally. Analysis is started by performing a computation to derive the vessel’s
Response Amplitude Operators (RAOs) in three (3) vertical mode of motions,
namely heave, roll, and pitch. Further the RAOs are processed in a spectral analysis
to obtain the spectral responses in random wave at significant wave height Hs
variations ranging from 1.0 m up to 7.0 m. Results of the spectral responses for
variations of Hs and load conditions are then correlated to the seakeeping criteria.
The correlation exhibits the maximum significant wave height for operation may
be limited to 1.3 m, 1.6 m, and 3.2 m, respectively, when the criteria from
Nordforsk, BV, and Olson are considered. Whereas the operability related to the
helicopter or good and personnel transfer criteria is found to be limited at maximum
significant wave height of 1.2 m. The probability of the vessel to be operated
optimally or operable without seismic survey activity at the forward speed V = 15.0
knots under the general criteria from Olson, with the reference to the wave scatter
diagram for Natuna Sea, may reach as high as 97.31% or only 2.69% down time,
In case the survey activity is performed at the forward speed V = 5.0 knots, in
accordance to Olson’s criteria, the vessel may attain 99.97% operability, whereas
by referring to Nordfosk and BV the operability is much lower in the order of
67.95%, or a down time of 32.05%.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 627.98 Ism a |
| Uncontrolled Keywords: | seismic survei vessel, RAOs, spectral responses, operability |
| Subjects: | T Technology > TC Hydraulic engineering. Ocean engineering > TC1680 Offshore structures |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 24 Feb 2020 04:27 |
| Last Modified: | 24 Feb 2020 04:27 |
| URI: | http://repository.its.ac.id/id/eprint/75132 |
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