Chasanah, Uswatul (2016) Analisa Pengaruh Sudut Dan Tebal Kisi Pengaman Terhadap Performa Bow Thruster Menggunakan Metode CFD. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penambahan bow thruster pada kapal sekarang telah
banyak dilakukan. Namun, dengan dilubanginya lambung kapal
maka diperlukan penambahan kisi pengaman pada setiap ujung
tunnel dari bow thruster. Hal ini dikarenakan dengan penambahan
bow thruster yang mana diameter dari tabung dan lambung yang
terbuka akibat tunnel dari bow thruster serta efisiensi thruster
yang tinggi akan menambah tahanan kapal terutama saat kapal
bergerak (John, L. Beveridge, 1972). Peletakkan kisi pengaman
disarankan searah vertical terhadap aliran air yang melalui tunnel
untuk mengurangi momentum bagian depan dan belakang dari
tunnel yang diakibatkan aliran air yang melewatinya (English,
1966). Selain peletakkan secara vertical, peletakkan secara
horizontal dari kisi pengaman juga bisa mengurangi static merit
coefficient C dengan menambahkan jumlah batang dari kisi
pengaman (Taniguchi,1966).
Berdasarkan penelitian menggunakan metode CFD
(Computational Fluid Dynamic) yaitu dengan variasi ketebalan
dan banyaknya batang kisi pengaman, semakin tebal kisi
pengaman dan semakin banyak kisi pengaman bisa menambah
thrust dan torque yang dihasilkan bow thruster. Seperti thrust
yang didapatkan untuk kisi sebanyak 4 batang adalah 13.049 kN
dan torque 1.1820 kNm sementara kisi dengan jumlah 12 batang
dengan tebal yang sama dapat menghasilkan thrust sebesar 13.085vi
kN dan torque sebesar 1.1853 kNm. Namun hal tersebut
berbanding terbalik dengan apabila sudut kisi pengaman dirubah,
semakin besar sudut kisi pengaman, maka thrust dan torque nya
akan berkurang, jika dengan sudut 00 thrust yang dihasilkan oleh
bow thruster sebesar 13.366 kN dan torque sebesar 1.2103 kNm.
Sementara jika sudutnya ditambah menjadi 300 thrust yang
dihasilkan bow thruster sebesar 13.164 kN dan torque sebesar
1.1922 kNm. Dan untuk tahanan kapal, semakin banyak jumlah
batang maka sakin berkurang pula tahanan yang dihasilkan,
namun penurunannya tidak terlalu signifikan
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The addition of bow thruster on the vessel have now been
carried out. However, with the hole in the hull will required to
add of a grating on each end of the tunnel bow thruster. This is
because with the addition of a bow thruster which the diameter of
the tube and open gastric result of the bow thruster tunnel
thruster and high efficiency will add to arrest the ship, especially
when the ship moves (John, L. Beveridge, 1972). The placement
of the suggested safety grating in the direction vertical to the flow
of water through the tunnel to reduce the momentum of the front
and rear of the tunnel caused the flow of water through it
(English, 1966). In addition to laying vertically, horizontally
laying of the security grating can also reduce static merit
coefficient “C” by adding the number of stems of safety grating
(Taniguchi, 1966).
Based on research using CFD (Computational Fluid
Dynamics) with the thickness variation and the number of rods
grating, grating grew thicker and more grating can add thrust
and torque of bow thruster. As thrust obtained for the grid as
much as 4 rods is 13. 049 kN and torque 1.1820 kNm provisional
grid with the number 12 sticks with the same thickness can
produce a thrust of 13.085 kN and a torque of 1.1853 kNm. But itviii
was inversely proportional when the angle of grating was
changed and grating angle was greater , then thrust and torque
will be reduced, if the angle 00 thrust of the bow thruster was
13.366 kN and a torque was 1.2103 kNm. Meanwhile, if the angle
was increased to 300 the thrust of bow thruster was 13 164 kN
and a torque was 1.1922 kNm. And the resistance of ship, if the
number and the thickness of grating increase, so the resistance
was decrease, but the decrease was not significant
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSSP 623.870 113 Cha a |
| Uncontrolled Keywords: | Bow Thruster, CFD, Kisi Pengaman, Thrust, Torque |
| Subjects: | T Technology > T Technology (General) > T57.62 Simulation V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM773 Ship propulsion, Electric |
| Divisions: | Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis |
| Depositing User: | Mr. Tondo Indra Nyata |
| Date Deposited: | 31 Mar 2020 06:48 |
| Last Modified: | 31 Mar 2020 06:48 |
| URI: | http://repository.its.ac.id/id/eprint/75624 |
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