Kajian Sistem Peredam Gerak Roll LCU Vessels dengan Variasi Posisi Bilge Keel Berbasis Metode Eksperimen

Sumarsono, Sumarsono (2023) Kajian Sistem Peredam Gerak Roll LCU Vessels dengan Variasi Posisi Bilge Keel Berbasis Metode Eksperimen. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Landing Craft Utility (LCU) tergolong dalam Type kapal Deck Cargo dengan muatan berada diatas deck, tidak di atas tank top. Sehingga kecenderungan untuk mengalami rolling cukup besar karena posisi titik berat cukup tinggi. Untuk itu dibutuhkan fin/sirip untuk meredam gerak rolling demi keselamatan kapal dan muatan. Bilge keel menjadi alternatif peredam rolling yang murah dan mudah dalam pemasangan dan pengoperasiannya serta dapat memenuhi kriteria untuk menurunkan rolling. Namun pemasangan bilge keel yang tidak tepat dapat menimbulkan tambahan hambatan pada kapal. Studi komprehensif dapat dilakukan untuk menentukan posisi penempatan bilge keel agar tidak memberikan pengaruh penambahan hambatan kapal yang terlalu besar namun mempunyai kemampuan untuk meredam gerak rolling yang cukup baik.
Pada penelitian ini telah dikaji pengembangan variasi posisi penempatan bilge keel sebagai roll damping. Eksperimen pengujian model kapal dilakukan untuk mengetahui efektifitas kemampuan bilge keel meredam gerak rolling kapal dan pengaruh posisi penempatan bilge keel terhadap penambahan hambatan kapal. Aliran di sekitar permukaan kapal diamati dengan eksperimen pengujian paint smear untuk mendapatkan pola aliran yang menjadi dasar untuk menentukan posisi penempatan bilge keel. Roll decay dan resistance test dilakukan untuk mengetahui kemampuan roll damping dan pengaruh terhadap penambahan hambatan kapal. Penempatan bilge keel pada posisi transisi antara bottom dan lambung samping memiliki koefisien roll damping yang paling tinggi, hingga 28.57% jika dibandingkan dengan kondisi tanpa bilge keel. Namun demikian, penempatan ini berdampak pada peningkatan hambatan rata-rata hingga 8.84%. Penempatan bilge keel yang dekat dengan garis sarat kapal memiliki koefisien roll damping yang cukup baik hingga 21.27%, namun hanya 3.66% tambahan hambatan yang dihasilkan dibanding dengan kondisi tanpa bilge keel.
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Landing Craft Utility (LCU) is classified as a type of Deck Cargo ship with cargo on the deck, not on the tank top. So the tendency to experience rolling is quite large because the position of the heavy point is quite high. For this reason, a fin is needed to reduce rolling motion for the safety of the ship and cargo. Bilge keel is an alternative rolling damper that is cheap and easy to install and operate and can meet the criteria to reduce rolling. However, improper bilge keel installation can cause additional drag on the ship. A comprehensive study can be conducted to determine the position of bilge keel placement so that it does not have the effect of adding too much ship resistance but has the ability to reduce rolling motion well enough.
In this research, the development of variations in bilge keel placement position as roll damping has been studied. Ship model testing experiments were conducted to determine the effectiveness of the bilge keel's ability to reduce the rolling motion of the ship and the effect of the bilge keel placement position on the additional drag of the ship. The flow around the ship surface is observed by paint smear testing experiments to obtain the flow pattern which is the basis for determining the bilge keel placement position. Roll decay and resistance tests were conducted to determine the roll damping capability and the effect on the addition of ship resistance. The bilge keel placement at the transition position between the bottom and side hull has the highest roll damping coefficient, up to 28.57% when compared to the condition without bilge keel. However, this placement resulted in an average drag increase of up to 8.84%. The bilge keel placement close to the ship's laden line has a good roll damping coefficient of up to 21.27%, but only 3.66% additional drag is generated compared to the condition without bilge keel.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	bilge keel, experiment model test, paint smear test, resistance test, roll decay test
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM751 Resistance and propulsion of ships V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM761 Stability of ships
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36101-(S2) Master Theses
Depositing User:	- SUMARSONO
Date Deposited:	31 Jul 2023 03:45
Last Modified:	31 Jul 2023 03:45
URI:	http://repository.its.ac.id/id/eprint/100753

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