Papers by Nandiko Rizal, S.T., M.T.
Curved and Layered Structures, Dec 31, 2023
Wave: Jurnal Ilmiah Teknologi Maritim, Dec 14, 2022
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Confidence levels of the seakeeping experiment results can be assessed through uncertainty analys... more Confidence levels of the seakeeping experiment results can be assessed through uncertainty analysis. The seakeeping experiments with a free-running model system were carried out in the manoeuvring and ocean engineering basin (MOB) at the Indonesian Hydrodynamic Laboratory (IHL) using uncertainty techniques to improve the experiment quality. The method used is the International Organization for Standardization, Guide for Uncertainty of Measurements (ISO-GUM), type A and B uncertainty, which is the foundation for the uncertainty analysis for seakeeping experiment recommendations released by the International Towing Tank Conference (ITTC). This research aims to determine the combined uncertainty value of the seakeeping experiment on a benchmark ship model with a scale of 1:62, representing the full scale of 186 meters. Seakeeping testing is carried out under head and beam waves, each with regular waves at one wave height (Hs) with three different wave periods (Tw). The experimental sea...
Wave: Jurnal Ilmiah Teknologi Maritim, Dec 14, 2022
Perkembangan energi terbarukan mengalami peningkatan pesat seiring menipisnya cadangan bahan baka... more Perkembangan energi terbarukan mengalami peningkatan pesat seiring menipisnya cadangan bahan bakar fosil. Arus laut adalah sumber energi terbarukan yang memiliki potensi besar di Indonesia namun didominasi oleh kecepatan arus rendah. Vertical Axial Tidal Current Turbine (VATCT) adalah teknologi yang cukup efektif mengkonversi energi arus laut rendah menjadi energi listrik. NACA 63(4)021 adalah jenis hidrofoil yang sedang trend digunakan karena dapat menghasilkan efisiensi yang lebih baik. Oleh karena itu, dilakukan studi numerik hidrofoil NACA 63(4)021 berdasarkan kondisi kecepatan arus rendah. Studi numerik menggunakan model 2D dengan variasi sudut serang dan initial condition Re 200.000. Dari hasil studi, diketahui nilai Cl maksimal 1,16 pada AoA 15?, sedangkan nilai Cd cukup rendah pada AoA antara 0? hingga 10?. Nilai Cl/Cd maksimal adalah 25.5 pada AoA 8?. Dengan demikian, direkomendasikan sudut ideal hidrofoil NACA 63(4)02 pada VATCT adalah 8? (untuk turbin fixed pitch) atau pada rentang sudut 5? hingga 10? (untuk turbin active-passive pitch).
IOP Conference Series: Earth and Environmental Science
Experimental uncertainty and measurement, particularly in engineering, have been increasingly emp... more Experimental uncertainty and measurement, particularly in engineering, have been increasingly emphasized over the last 20 years. Uncertainty analysis of ship model testing in seakeeping experiments based on International Organization for Standardization, Guide for Uncertainty of Measurements (ISO-GUM), report with recommendations published by ITTC (2008). In this paper, the uncertainties for free-running tests were performed for a model scale 1:62 as a benchmark model test at the Indonesian Hydrodynamic Laboratory (IHL). The benchmark model is representative of a full scale of 186 meters. The model has full appendages as well as a rudder and propellers to allow for free-running tests, natural roll period, free roll decay, and swing tests. Factors of basic uncertainty (type A and type B) are estimated using model tests. The standard deviation of the mean value of a repeated measurement is uncertainty type A. However, Type B uncertainty is estimated from manufacturing specifications. ...
Journal of Ocean, Mechanical & Aerospace -science and engineering- (JOMAse), 2018
Pure experiments done at Laboratory for Hydrodynamics
Technology, in the form of seakeeping test... more Pure experiments done at Laboratory for Hydrodynamics
Technology, in the form of seakeeping test of ship perambuan
model at full load condition to obtain motion data of ship model
recorded by using wireless optical tracking system. With wireless
optical tracking system is expected to be more able to describe the
phenomenon of motions the ship while sailing. Seakeeping test
ship perambuan model is done at Maneuovering and Ocean
Engineering Basin (MOB), in irregular wave conditions with
significant wave heights Hs = 2.0 m and peak wave period Tp =
8.0 sec at the direction of wave relative to the direction of the ship
180 deg and 135 deg. Measurement of motion of the ship includes
6 DoF (Degree of Freedom) motions that is surge, sway, heave,
roll pitch and yaw. Statistical analysis of measurement results is
presented in order to know the quality of the ship motion. To
support the analysis, the measurement results are also displayed
in the Response Amplitude Operator, RAO
Pure experiments done at Laboratory for Hydrodynamics Technology, in the form of seakeeping test ... more Pure experiments done at Laboratory for Hydrodynamics Technology, in the form of seakeeping test of ship perambuan model at full load condition to obtain motion data of ship model recorded by using wireless optical tracking system. With wireless optical tracking system is expected to be more able to describe the phenomenon of motions the ship while sailing. Seakeeping test ship perambuan model is done at Maneuovering and Ocean Engineering Basin (MOB), in irregular wave conditions with significant wave heights Hs = 2.0 m and peak wave period Tp = 8.0 sec at the direction of wave relative to the direction of the ship 180 deg and 135 deg. Measurement of motion of the ship includes 6 DoF (Degree of Freedom) motions that is surge, sway, heave, roll pitch and yaw. Statistical analysis of measurement results is presented in order to know the quality of the ship motion. To support the analysis, the measurement results are also displayed in the Response Amplitude Operator, RAO.
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Papers by Nandiko Rizal, S.T., M.T.
Technology, in the form of seakeeping test of ship perambuan
model at full load condition to obtain motion data of ship model
recorded by using wireless optical tracking system. With wireless
optical tracking system is expected to be more able to describe the
phenomenon of motions the ship while sailing. Seakeeping test
ship perambuan model is done at Maneuovering and Ocean
Engineering Basin (MOB), in irregular wave conditions with
significant wave heights Hs = 2.0 m and peak wave period Tp =
8.0 sec at the direction of wave relative to the direction of the ship
180 deg and 135 deg. Measurement of motion of the ship includes
6 DoF (Degree of Freedom) motions that is surge, sway, heave,
roll pitch and yaw. Statistical analysis of measurement results is
presented in order to know the quality of the ship motion. To
support the analysis, the measurement results are also displayed
in the Response Amplitude Operator, RAO
Technology, in the form of seakeeping test of ship perambuan
model at full load condition to obtain motion data of ship model
recorded by using wireless optical tracking system. With wireless
optical tracking system is expected to be more able to describe the
phenomenon of motions the ship while sailing. Seakeeping test
ship perambuan model is done at Maneuovering and Ocean
Engineering Basin (MOB), in irregular wave conditions with
significant wave heights Hs = 2.0 m and peak wave period Tp =
8.0 sec at the direction of wave relative to the direction of the ship
180 deg and 135 deg. Measurement of motion of the ship includes
6 DoF (Degree of Freedom) motions that is surge, sway, heave,
roll pitch and yaw. Statistical analysis of measurement results is
presented in order to know the quality of the ship motion. To
support the analysis, the measurement results are also displayed
in the Response Amplitude Operator, RAO