Nababan, Audia Naomi Putri (2020) Analisis Pitching dan Heaving Akibat Penggunaan Trim-tab pada Kapal Corvette dengan Menggunakan Metode Numerik. Other thesis, Institut Teknologi Sepuluh Nopember.
Preview |
Text
04111540000030-Undergraduate_Thesis.pdf Download (8MB) | Preview |
Abstract
Penggunaan trim-tab pada high speed craft seperti speed boat sudah sering ditemukan. Namun tidak untuk kapal perang seperti kapal korvet. Maka dibutuhkan suatu analisis olah gerak kapal dengan cara membandingkan tiga variasi sudut trim-tab (0 derajat, 3 derajat, 5 derajat) dengan tiga variasi luasan bidang trim-tab (AR1.5, AR1.75, AR2) pada dua kecepatan kapal korvet yaitu 15 dan 30 knot. Penerapan metode numerik berbasis panel method 3D-Diffraction yang dibantu oleh perangkat lunak ANSYS AQWA serta program 3D-Modelling seperti Maxsurf dan Rhinoceros, dapat mempermudah proses running data. Pemodelan trim-tab pada penelitian ini dimodelkan sama dengan bentuk airfoil tipe NASA SC (2)-0402. Analisis ini berguna untuk mencari besar nilai RAO (Reponse Amplitude Operator), nilai respon gerakan pada gelombang irregular dan beberapa koefisiensi lain yang dapat mempengaruhi nilai pitching dan heaving saat kapal melaju dengan tambahan trim-tab pada bagian transom kapal. Hasil analisis yang didapatkan adalah kondisi kecepatan, rasio bidang dan sudut trim-tab yang paling optimal dalam pengurangan nilai RAO pitching dan heaving. Persentase pengurangan nilai RAO pitching dan heaving secara berurutan pada 15knot (AR2-3 = 17.032% dan AR2-5 = 7.480%) dan 30knot (AR2-3 = 22.403% dan AR2-5 = 6.442%). Selanjutnya untuk nilai respon gerakan pada gelombang irreguler pengurangan respon spektrum pitching dan heaving secara berurutan pada 15knot (AR2-3 = 41.983% dan AR2-3 = 32.529%) dan 30knot (AR2-3 = 49.602% dan AR2-3 = 34.295%). Lalu, nilai added damping yang diakibatkan oleh tambahan trim-tab secara keseluruhan dapat ditarik kesimpulan bahwa penambahan paling besar terjadi pada AR2-3, dengan semakin besar penambahan ini akan berakibat pula pada besarnya penurunan nilai RAO. Proses analisis dari permasalahan kali ini diharapkan dapat mendorong adanya penelitian lebih lanjut untuk mengoreksi high bow condition pada high speed craft akibat penggunaan trim-tab, baik dari segi tingkat ekonomis, keselamatan dan lain sebagainya.
====================================================================================================================================
The use of trim-tabs on high speed craft such as speed boats are often found. But not for warships like corvette ships. So an analysis of the ship motion by comparing three variations of the trim-tab angle (0 degrees, 3 degrees, 5 degrees) with three variations of the trim-tab plane area (AR1.5, AR1.75, AR2) at two velocity vessels which are 15 and 30 knots is needed. The application of panel-based numerical methods 3D-Diffraction method which is assisted by ANSYS AQWA software and 3D-Modeling programs such as Maxsurf and Rhinoceros can facilitate the process of running data.Trim-tab modeling in this study is modeled the same as the NASA SC (2) -0402 type airfoil. This analysis is used to find the RAO (Response Amplitude Operator) value, the response value of movements in irregular waves and some other coefficients that can affect the pitching and heaving values when the ship is moving with additional trim-tabs on the transom of the ship. The analysis results obtained are velocity condition, field ratio and the most optimal trim-tab angle in reducing RAO pitching and heaving values. The percentages in RAO pitching and heaving values reduction are 15knot (AR2-3 = 17,032% and AR2-3 = 7,480%) and 30knot (AR2-3 = 22,403% and AR2-5 = 6,442%). Furthermore, for the motion response value on irregular waves, the reductions of pitching and heaving spectrum response are respectively 15knot (AR2-3 = 41,983% and AR2-3 = 32,529%) and 30knot (AR2-3 = 49,602% and AR2-3 = 34,295%). Then, the added value of damping caused by the addition of the trim-tab as a whole can be concluded that the greatest addition occurs in AR2-3, the greater addition will impact the magnitude of the value decrement of RAO. The analysis process of this problem is expected to encourage a further research to correct high bow conditions in high speed craft due to the use of trim-tabs, both in terms of economic, safety and etc.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSPe 623.812 Nab a-1 |
| Uncontrolled Keywords: | Kapal korvet, RAO, Trim-Tab, Aspek Rasio(AR) |
| Subjects: | T Technology > T Technology (General) > T57.83 Dynamic programming T Technology > TA Engineering (General). Civil engineering (General) > TA357 Computational fluid dynamics. Fluid Mechanics |
| Divisions: | Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis |
| Depositing User: | Audia Naomi Putri Nababan |
| Date Deposited: | 22 Jul 2024 02:31 |
| Last Modified: | 22 Jul 2024 02:31 |
| URI: | http://repository.its.ac.id/id/eprint/73660 |
Actions (login required)
 |
View Item |