Study Of Floatplane Seakeeping In Wavy Waters Using Numerical Methods And Experimental Testing

Hadi Putro, Bimo (2025) Study Of Floatplane Seakeeping In Wavy Waters Using Numerical Methods And Experimental Testing. Masters thesis, Institute Technology of Sepuluh Nopember.

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Abstract

PT Dirgantara Indonesia (PT DI) is currently developing an amphibious aircraft (floatplane) capable of taking off and landing on both water and land surfaces. This amphibious aircraft is a conversion of the N219 aircraft by adding floaters to its landing gear, which function to keep the aircraft afloat on the water surface. The design of the floaters must meet performance criteria, particularly from the hydrodynamic aspect, especially during take-off operations in wavy sea conditions. The interaction between the floater hull and the waves causes the amphibious aircraft to experience three types of oscillatory motion: heave, roll, and pitch. A seakeeping study of the amphibious aircraft is crucial as it directly relates to passenger safety and comfort when the aircraft moves at high speed during take-off. Theoretically, seakeeping performance is influenced by several variables, including wave characteristics, speed, floater spacing, and the heading angle relative to the wave propagation direction. This research aims to conduct a seakeeping study of the high-speed amphibious N219 aircraft operating in both regular and irregular wave conditions using numerical and experimental methods. The numerical simulation will be carried out using AQWA software based on the Panel Method theory, and for the regular wave case, it will be validated through experimental testing of the amphibious aircraft model in a towing tank. Specifically, the study investigates the effect of floater spacing ratios (S/L = 0.3, 0.4, and 0.5) on oscillatory motion responses across a range of wave excitation frequencies. The results indicate that the S/L = 0.4 configuration provides the best performance in reducing pitch, heave, and roll motions at most excitation frequencies, as evidenced by the lowest Motion Sickness Incidence (MSI) values for wave headings of 0º, 90º, 135º, and 180º at wave heights of 0.5 m and 1 m. Conversely, the S/L = 0.3 configuration is more prone to roll resonance, especially at a 90º wave heading at all wave heights, with a drastic increase observed at 1.5 m. Meanwhile, the S/L = 0.5 configuration shows efficiency in reducing roll motion but significantly increases heave motion as wave height increases. This corresponds linearly with the highest discomfort score in the heave motion mode, reaching 64.15%.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	floatplane; ekperimen; numerik; seakeeping; gelombang, experiment; numerical; seakeeping; waves
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36101-(S2) Master Thesis
Depositing User:	Bimo Hadi Putro
Date Deposited:	19 Aug 2025 00:55
Last Modified:	19 Aug 2025 00:55
URI:	http://repository.its.ac.id/id/eprint/128103

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