Studi Hydrodynamic Coefficients Manuver Kapal dari Hasil Eksperimen dengan Metode Open Free Running Test

Michael, Michael (2021) Studi Hydrodynamic Coefficients Manuver Kapal dari Hasil Eksperimen dengan Metode Open Free Running Test. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Manuver merupakan salah satu kemampuan yang harus dimiliki setiap kapal untuk mengubah arah kapal. Sebuah kapal harus dapat merespon secara akurat untuk beragam pola manuver kapal di laut seperti menghindari kapal lain. Kemampuan manuver kapal harus memenuhi kriteria yang telah ditetapkan oleh IMO. Salah 1 bentuk pengujian untuk mengukur kemampuan manuver kapal adalah turning circle test. Pemodelan matematis dilakukan untuk menganalisa kemampuan manuver kapal. Pemodelan matematis dapat mendeskripsikan pergerakan kapal untuk mendesain sistem autopilot. Pemodelan dilakukan dengan menentukan gaya dan momen hidrodinamika yang terjadi selama kapal melakukan manuver. Koefisien hidrodinamika merupakan turunan parsial dari gaya hidrodinamika terhadap masing-masing variabel gaya dan juga momen hidrodinamika. Pada penelitian ini dilakukan studi untuk estimasi koefisien hidrodinamika pada 2 derajat kebebasan kapal, yaitu sway dan juga yaw. Metode yang digunakan adalah Unscented Kalman Filter dan juga analisa regresi linear dengan data pengukuran dari hasil eksperimen dengan metode open free running test. Data pengukuran yang didapatkan berupa hasil yaw rate, posisi x0 dan y0 kapal, serta sudut heading kapal selama melakukan manuver turning circle 35 derajat. Hasil dari penelitian ini menunjukkan bahwa Root Mean Square Error (RMSE) yang didapat dari hasil estimasi bervariasi pada rentang nilai 9.9701 x 10-5 hingga 6.3294 x 10-2, Nilai Koefisien Hidrodinamika untuk gerakan sway dan juga yaw yang didapatkan dari hasil regresi linear memiliki selisih error yang bervariasi pada rentang nilai 7.3825% hingga 11.2079%. Hasil open free running test memiliki nilai advance sebesar 2.2841 m, nilai transfer sebesar 1.3556 m, dan nilai tactical diameter sebesar 2.3215 m. Sedangkan untuk hasil simulasi model Nomoto memiliki nilai advance sebesar 2.2500 m, nilai transfer sebesar 1.2794 m, dan nilai tactical diameter sebesar 2.2898 m. Dimana didapatkan selisih nilai advance sebesar 1.4929%, transfer sebesar 5.6211%, dan tactical diameter sebesar 1.3655%. Nilai RMSE antara hasil simulasi dengan model Nomoto dengan pengujian open free running test adalah sebesar 0.1272. ==================================================================================================== Every ship must be able to do maneuvers in order to change the ship's direction. A ship must be able to respond accurately to various maneuver patterns of ships at sea such as avoiding other ships. The maneuverability of the ship must meet the criteria set by IMO. One form of testing to measure the maneuverability of a ship is the turning circle test. Mathematical modelling is carried out to analyze the maneuverability of the ship. Mathematical modelling can describe the movement of a ship to design an autopilot system. Modelling is done by determining the hydrodynamic forces and moments that occur during the ship's maneuvers. The hydrodynamic coefficient is a partial derivative of the hydrodynamic force on each force variable and also the hydrodynamic moment. In this research, a study was conducted to estimate the hydrodynamic coefficient at 2 degrees of freedom of the ship, namely sway and yaw. The method used is the Unscented Kalman Filter and also linear regression analysis with measurement data from the experimental results with the open free running test method. The measurement data obtained are the results of the yaw rate, the position of x0 and y0 of the ship, as well as the angle of the ship's heading during the 35-degree turning circle maneuver. The results of this study indicate that the Root Mean Square Error (RMSE) obtained from the estimation results varies in the value range 9.9701 x 10-5 to 6.3294 x 10-2, the hydrodynamic coefficient value for sway and yaw movements obtained from linear regression results has the difference in error varies in the value range of 7.3825% to 11.2079%. The results of the open free running test have an advance value of 2.2841 m, a transfer value of 1.3556 m, and a tactical diameter value of 2.3215 m. Meanwhile, the Nomoto model simulation results have an advance value of 2.2500 m, a transfer value of 1.2794 m, and a tactical diameter value of 2.2898 m. Where the difference in advance value is 1.4929%, transfer is 5.6211%, and tactical diameter is 1.3655%. The RMSE value between the simulation results with Nomoto model compare to the open free running test is 0.1272.

Item Type: Thesis (Undergraduate)
Uncontrolled Keywords: hydrodynamic coefficients, Nomoto model, open free running test, linear regression, unscented kalman filter, koefisien hidrodinamika, model Nomoto, open free running test, regresi linear, unscented kalman filter
Subjects: V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions: Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Michael Michael
Date Deposited: 10 Mar 2021 02:42
Last Modified: 10 Mar 2021 02:42
URI: https://repository.its.ac.id/id/eprint/83943

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