Analisis Keandalan Struktur Floater Pesawat N219 Akibat Beban Gelombang Acak

Meiliana, Sandra Widia (2025) Analisis Keandalan Struktur Floater Pesawat N219 Akibat Beban Gelombang Acak. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Floatplane N219 merupakan pengembangan dari pesawat N219 milik PT Dirgantara Indonesia yang dirancang khusus untuk operasi maritim. Dalam pengoperasiannya, struktur floater pesawat harus mampu menahan tegangan akibat beban gelombang laut, yang menjadi salah satu aspek penting dalam perancangan struktur pesawat ini. Studi ini menyajikan metode evaluasi desain struktur floater pesawat N219 berdasarkan kriteria ketahanan terhadap beban statis dan dinamis yang dihasilkan oleh gelombang tidak beraturan selama operasi maritim. Beban dinamis dihitung menggunakan perangkat lunak ANSYS AQWA yang menerapkan teori difraksi 3D dan mengasumsikan fluida tidak memiliki viskositas. Simulasi kondisi operasional melibatkan variasi tinggi gelombang sebesar 0,5 m, 1 m, dan 1,5 m, serta lima variasi arah datang gelombang terhadap arah pesawat. Model floater disimulasikan dalam domain waktu pada kecepatan konstan untuk memperoleh output momen lentur vertikal sepanjang struktur pesawat. Tegangan struktural dihitung dengan membagi nilai momen lentur terhadap modulus penampang struktur pada titik di mana momen lentur maksimum terjadi. Kelayakan desain kemudian dievaluasi menggunakan model keandalan struktur yang mempertimbangkan ketidakpastian beban gelombang serta kekuatan material struktur, dengan tiga jenis material yang diuji: aluminium, HDPE, dan CFRP. Hasil simulasi menunjukkan bahwa desain struktur dengan material aluminium dan CFRP sangat andal dalam menahan beban gelombang di semua kondisi, dengan faktor keamanan masing-masing sebesar 5.1 dan 6.84 . Namun, hal ini tidak berlaku untuk konstruksi berbahan HDPE yang menunjukkan indeks keandalan -1.54 ketika tinggi gelombang melebihi 1,5 m. Oleh karena itu, diperlukan peningkatan modulus transversal material HDPE untuk mengurangi tegangan yang ditimbulkan oleh beban gelombang.
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The N219 floatplane is an improvement to PT Dirgantara Indonesia's N219 aircraft suited for maritime operations. The wave stress on the floater structure during operation must be factored into the aircraft design. This study presents a method for evaluating the design of the N219 aircraft's floater structure using criteria for withstanding static and dynamic loads from irregular waves during maritime operations. Dynamic loads are estimated using ANSYS AQWA, which use a 3D diffraction theory and assumes a fluid with no viscosity. The operational condition simulations include wave height variations of 0.5m, 1m, and 1.5m, as well as five changes in the aircraft's direction relative to the wave direction. The floater model at constant speed is simulated in the time domain to get vertical bending moment outputs along the aircraft structure. The structural stress is computed by dividing the bending moment by the structural modulus at the region where the maximum bending moment occurs. The design feasibility is evaluated using a structural reliability model that takes into consideration wave load unpredictability and structural material strength, with three material types tested: Aluminium, HDPE, and CFRP. The simulation findings show that the aluminium and CFRP structural designs are extremely reliable in withstanding wave loads in all circumstances, with safety factors of 5.1 and 6.84, respectively. However, this is not the case for HDPE material construction, which has a safety index of -1.54 when wave height surpasses 1.5m, necessitating an increase in the construction's transverse modulus to lower the magnitude of stress induced by wave loads.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Floatplane, Keandalan Struktur, Wave Loads, Floatplane, Structure Reliability, Wave Loads
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 > 36101-(S2) Master Thesis
Depositing User:	Sandra Widia Meiliana
Date Deposited:	06 Aug 2025 09:34
Last Modified:	06 Aug 2025 09:34
URI:	http://repository.its.ac.id/id/eprint/127861

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