Ahmad, Imran (2016) Analisis Kekuatan Struktur Haluan Kapal Survei Seismik Geomarin Iv Terhadap Beban Slamming Dan Greenwater. Undergraduate thesis, Institut Technology Sepuluh Nopember.
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Abstract
Dalam tugas akhir ini telah dilakukan kajian kekuatan struktur haluan
kapal survei seismik Geomarin IV terhadap beban slamming dan greenwater.
Kajian diawali dengan analisis gerakan kapal pada tiga kondisi, yaitu tanpa
pengoperasian streamer serta dengan pengoperasian streamer pada kondisi
pembebanan full load dan light load. Analisis gerakan pada kondisi tanpa
pengoperasian streamer dilakukan dengan menggunakan software Maxsurf dan
pada kondisi pengoperasian streamer dilakukan dengan menggunakan software
ORCAFLEX. Hasil dari analisis gerakan kemudian digunakan untuk mendapatkan
gerak relatif vertikal haluan pada titik tinjau tertentu pada daerah haluan kapal.
RAO gerak relatif vertikal haluan akan ditransformasikan mejadi karakteristik di
gelombang acak, yaitu dengan melakukan analisis spektra. Selanjutnya dilakukan
komputasi untuk memprediksi peluang terjadinya slamming dan greenwater,
intensitas terjadinya slamming dan greenwater, serta besarnya tekanan slamming
pada alas haluan dan tekanan greenwater pada geladak haluan. Hasil komputasi
menunjukan tekanan terbesar akibat slamming mencapai 42.34 kPa dan tekanan
terbesar akibat greenwater sebesar 3.6 kPa. Berdasarkan tekanan tersebut telah
dilakukan analisis kekuatan struktur haluan dan didapatkan tegangan maksimum
pada struktur alas haluan sebesar 27.57 MPa dengan deformasi 0.37 mm dan
tegangan maksimum pada struktur geladak haluan sebesar 95.32 MPa dengan
deformasi 3.09 mm. Hasil ini masih lebih kecil jika dibandingkan dengan tegangan
ijin dan deformasi yang dianjurkan oleh ABS yaitu 223.25 MPa serta BKI dengan
tegangan ijin 195.83 Mpa. Dengan demikian konstruksi alas dan geladak haluan
kapal survei seismik Geomarin IV aman terhadap beban slamming dan
greenwater.
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This final project is focused on the study about the strength of the bow structure of
seismic survey vessel Geomarin IV due to slamming and greenwater loads. This
analysis begins with analyzing ship motion in three conditions, namely with and
without streamer of full load and light load loading condition. Motion analysis
without streamer is generated by Maxsurf Motion software while the motion
analysis with streamer installed is generated by time domain simulation software.
The results of these analysis are then used to obtain relative vertical bow motion at
reference point on the bow area of the vessel. RAO of relative vertical bow motion
will be transformed to derive the characteristic in random waves, by applying the
spectral analysis. Then computation is performed to predict probabilities of
slamming and greenwater, occurrences of slamming and greenwater, and
slamming pressure at the bottom of bow structure and greenwater pressure at the
deck of bow structure. The result from computation show that the pressure due to
slamming reached 42.34 kPa dan the pressure due to greenwater reached 3.6 kPa.
Based on these pressures, strength analysis of the bow structure was then
performed. And the result showed the maximum stress at bottom of bow structure
is about 27.57 MPa with deformation 0.37 mm and the maximum stress at a deck
of bow structure is about 95.32 Mpa with deformation 3.09 mm. These findings
are acceptable if compared to the allowable stress from ABS and BKI which are
223.25 Mpa and 195.83 Mpa. In conclusion it could be considered that the bottom
and deck construction of bow structure of Geomarin IV is safe from slamming and
greenwater loads.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSKe 622.159 2 Ahm a |
| Uncontrolled Keywords: | Kapal survei seismik , Slamming, Greenwater, Kekuatan struktur haluan |
| Subjects: | Q Science > QE Geology > QE538.5 Seismic waves. Elastic waves |
| Divisions: | Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 23 Dec 2019 02:41 |
| Last Modified: | 23 Dec 2019 02:41 |
| URI: | http://repository.its.ac.id/id/eprint/72456 |
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