Modifikasi Desain Penetration Pada Konstruksi Pressure Hull Terhadap Usia Kelelahan Kapal Selam

Santiung, Muh Aulia Fadhlurrahman (2023) Modifikasi Desain Penetration Pada Konstruksi Pressure Hull Terhadap Usia Kelelahan Kapal Selam. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penetration merupakan bagian pada pressure hull kapal selam yang menghubungkan berbagai komponen penetrator antara sisi luar dan dalam pressure hull. Oleh karena itu, perbedaan tekanan yang besar berdampak pada tingginya konsentrasi tegangan pada penetration yang dapat mengurangi usia kapal selam. Penelitian ini bertujuan untuk memodifikasi desain penetration untuk mengurangi konsentrasi tegangan agar usia kelelahan dapat meningkat dan dapat memenuhi standar safety factor. Simulasi difokuskan pada salah satu block section menggunakan metode Finite Element Method (FEM) dan modifikasi dilakukan pada 10 dari 25 penetration. Parameter solusi yang ditentukan adalah tegangan (equivalent stress), deformasi, fatigue cycle, usia kelelahan, dan safety factor dalam kedalaman 100, 150, 200, 250 m. Modifikasi dilakukan dengan menambahkan doubling/plate reinforcement, mengoptimasi dimensi inner nozzle, dan menambahkan ketebalan penetration sebesar 5 mm. Berdasarkan hasil simulasi, desain modifikasi terbukti lebih baik daripada desain existing dalam parameter tersebut. Desain modifikasi dapat menurunkan tegangan hingga 26,45%; menurunkan deformasi hingga 60,87%; dan meningkatkan fatigue cycle hingga 439%. Dengan hasil perhitungan parameter tersebut, hasil usia pressure hull dan safety factor desain modifikasi meningkat dari kondisi existing serta memenuhi standar minimum DNV GL.
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Penetration is part of the pressure hull of the submarine that connects the various penetrator components between the outside and inside of the pressure hull. Therefore, the large pressure difference has an impact on the high concentration of stress on penetration which can reduce the fatigue life of the submarine. This study aims to modify the penetration design to reduce stress concentration so that fatigue life can increase and meet safety factor standards. The simulation is focused on one of the pressure hull’s section block using the Finite Element Method (FEM) with Ansys Software (Static Structural Module) and modifications are made to 10 of 25 penetrations. The solution parameters determined were equivalent stress, deformation, fatigue cycle, fatigue life, and safety factor at depths variations of 100, 150, 200, 250 m. Modifications were made by adding doubling/plate reinforcement, optimizing the dimensions of the inner nozzle, and adding penetration’s thickness of 5 mm. Based on the simulation results, the modified design is proven to be better than the existing design in these parameters. Modified design can reduce equivalent stress up to 26.45%; reduce deformation up to 60.87%; and increase fatigue cycle up to 439%. With the results of the calculation of those parameters, the result of pressure hull fatigue and design modification safety factor increases from the existing conditions and meets the DNV GL minimum standard.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	existing, fatigue, modification, penetration, pressure hull, stress, submarine existing, usia kelelahan, modifikasi, penetration, pressure hull,tegangan, kapal selam
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM297 Ships Designs and drawings
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Muh Aulia Fadhlurrahman Santiung
Date Deposited:	16 Feb 2023 06:03
Last Modified:	16 Feb 2023 06:03
URI:	http://repository.its.ac.id/id/eprint/97449

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