Analisis Kegagalan dan Optimasi Desain Padeye Pada Cradle Kapal Offshore Patrol Vessel DWT 550 Ton Saat Proses Penempatan Launching

Ramadhani, Shidiq (2025) Analisis Kegagalan dan Optimasi Desain Padeye Pada Cradle Kapal Offshore Patrol Vessel DWT 550 Ton Saat Proses Penempatan Launching. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Padeye merupakan komponen penting pada cradle kapal yang berfungsi sebagai titik pengangkatan saat proses penempatan launching. Kegagalan pada struktur padeye dapat menyebabkan risiko kecelakaan dan kerugian material yang signifikan. Penelitian ini bertujuan untuk mengidentifikasi dan menganalisis pengaruh kegagalan struktur padeye pada cradle kapal Offshore Patrol Vessel DWT 550 Ton saat proses penempatan launching, mengetahui kondisi struktur padeye setelah dilakukan modifikasi, serta menentukan desain padeye yang optimal untuk proses penempatan launching. Metodologi yang digunakan adalah analisis numerik menggunakan software ANSYS untuk memodelkan dan mensimulasikan perilaku struktur padeye dalam kondisi pembebanan statis, serta MATLAB untuk optimasi dimensi. Analisis dilakukan dengan melakukan modifikasi terhadap dimensi padeye untuk mencari desain yang optimal. Berdasarkan hasil analisis, optimasi desain padeye dilakukan untuk menghasilkan struktur yang lebih tahan terhadap kegagalan dan lebih efektif dalam mendistribusikan beban. Hasil analisis padeye non-modifikasi menunjukkan bahwa padeye tersebut mengalami kegagalan ketika menahan beban saat proses penempatan launching dikarenakan nilai tegangan maksimum melebihi batas yield strength material yaitu sebesar 573,55 MPa. Hasil analisis padeye modifikasi menunjukkan penurunan nilai tegangan maksimum dibandingkan dengan padeye non-modifikasi yaitu sebesar 244,03 MPa sehingga modifikasi dikatakan bekerja dengan baik. Optimasi topologi padeye desain awal dan desain modifikasi menghasilkan nilai tegangan maksimum sebesar 539,12 MPa dan 155,64 MPa sedangkan optimasi dimensi padeye desain awal dan desain modifikasi menghasilkan nilai tegangan maksimum sebesar 996,63 MPa dan 205,7 MPa. Nilai tegangan maksimum desain awal melebihi yield strength sedangkan nilai tegangan maksimum desain modifikasi tidak
melebihi yield strength material dan memenuhi persyaratan struktural yang diperlukan. Dari sisi dimensi, terjadi perubahan signifikan pada desain awal yaitu penurunan panjang sebesar 35%, penurunan tinggi sebesar 50%, peningkatan tebal sebesar 17%, pengurangan diameter pinhole sebesar 43%. Sementara itu, pada desain modifikasi, tinggi mengalami penurunan 25%, tebal meningkat 50%, dan diameter pinhole berkurang 52%. Hasil penelitian ini diharapkan dapat memberikan kontribusi dalam perbaikan desain padeye untuk aplikasi pada kapal dan struktur offshore lainnya, serta meningkatkan keamanan dalam operasi penarikan.Kata kunci: Padeye, Optimasi Desain, Analisis Kegagalan
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Padeyes are important components of ship cradles that function as lifting points during the launching process. Failure of the padeye structure can cause accidents and significant material losses. This study aims to identify and analyze the impact of padeye structural failure on the cradle of an Offshore Patrol Vessel with a deadweight tonnage of 550 tons during the launching process, assess the condition of the padeye structure after modifications, and determine the optimal padeye design for the launching process. The methodology used involves numerical analysis using ANSYS software to model and simulate the behavior of the padeye structure under static loading conditions, as well as MATLAB for dimensional optimization. The analysis was conducted by modifying the padeye dimensions to find the optimal design. Based on the analysis results, padeye design optimization was performed to produce a structure that is more resistant to failure and more effective in distributing loads. The analysis results of the unmodified padeye showed that it failed when bearing the load during the launching process because the maximum stress value exceeded the material's yield strength limit of 573.55 MPa. The analysis results of the modified padeye showed a decrease in the maximum stress value compared to the non-modified padeye, which was 244.03 MPa, indicating that the modification worked effectively. Topology optimization of the initial design and modified design padeyes resulted in maximum stress values of 539.12 MPa and 155.64 MPa, respectively, while dimensional optimization of the initial design and modified design padeyes resulted in maximum stress values of 996.63 MPa and 205.7 MPa, respectively. The maximum stress value of the initial design exceeds the yield strength, while the maximum stress value of the modified design does not exceed the material's yield strength and meets the required structural requirements. In terms of dimensions, there are significant changes in the initial design, including a 35% reduction in length, a 50% reduction in height, a 17% increase in thickness, and a 43% reduction in pinhole diameter. Meanwhile, in the modified design, the height decreased by 25%, the thickness increased by 50%, and the pinhole diameter decreased by 52%. The results of this study are expected to contribute to the improvement of padeye design for applications on ships and other offshore structures, as well as enhance safety in towing operations. Keyword : Padeye, Desain Optimization, Failure Analysis.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Padeye, Optimasi Desain, Analisis Kegagalan, Padeye, Desain Optimization, Failure Analysis
Subjects:	T Technology > TC Hydraulic engineering. Ocean engineering T Technology > TC Hydraulic engineering. Ocean engineering > TC1665 Offshore structures--Materials.
Divisions:	Faculty of Marine Technology (MARTECH) > Ocean Engineering > 38201-(S1) Undergraduate Thesis
Depositing User:	Shidiq Ramadhani
Date Deposited:	18 Jul 2025 03:19
Last Modified:	18 Jul 2025 03:19
URI:	http://repository.its.ac.id/id/eprint/119984

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