Optimasi Struktur Bilga pada Kapal Tanker dengan Metode Elemen Hingga

Ubaidah, Dea Putri (2024) Optimasi Struktur Bilga pada Kapal Tanker dengan Metode Elemen Hingga. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Konstruksi alas pada kapal dirancang lebih kuat. Hal ini karena tekanan air cenderung mendesak alas kapal ke dalam. Selain itu, pojok-pojok badan kapal, seperti struktur bilga mengalami beban racking akibat pukulan gelombang pada sisi kapal atau pada saat kapal oleng. Bilga merupakan sudut terluar dari midship section sebuah kapal yang berada di titik terendah. Persyaratan kekuatan pada struktur bilga, terutama pada cargo hold kapal, telah diatur oleh klas. Berdasarkan Rules BV, ukuran struktur bilga kapal harus memenuhi persyaratan modulus minimum dan tegangan izin. Nilai modulus untuk struktur bilga dengan penguatan memanjang, melintang, dan campuran berbeda. Oleh karena itu, dibutuhkan optimasi struktur bilga dengan berbagai konfigurasi tersebut untuk mengetahui konfigurasi yang optimal. Metode optimasi yang digunakan adalah "optimization by design trial and error" dengan batasan tegangan izin rules BV dan fungsi objektif meminimumkan berat struktur. Dalam menentukan variasi dan ukuran scantling, mengacu pada model existing, yaitu Kapal Tanker 17500 DWT. Hasil optimasi struktur bilga kemudian dilakukan analisis dengan finite element software. Model yang dianalisis sepanjang satu kompartemen dengan panjang 3 m. Dari hasil optimasi diperoleh bahwa struktur bilga dengan penguatan campuran variasi 3 dengan panjang model 3 m memiliki berat struktur yang paling minimum, yaitu 5,970 ton. Variasi ini memiliki tegangan maksiimum sebesar 74,136 MPa. Berat struktur ini lebih ringan 6,088% dari model existing.
============================================================Bottom construction on ship is designed to be stronger than other constructions. Because water pressure pushes bottom inward. In addition, the corner of the hull, such as the bilge structure, gets racking due to wave blows on the side or the time when the ship rolls. Bilge is the outermost corner of the midship section that is at lowest point. Strength requirement on the bilge structure, especially on the cargo hold, has been regulated by class. Based on BV Rules, scantling on bilge structure must fulfill the minimum modulus and allowable stress requirement. The modulus for bilge structures with longitudinal, transverse, an combination construction is different. Therefore, it is necessary to optimize the bilge structure with these configurations to determine optimal configuration. Optimization method that is used in this research is "optimization by design trial and error" with the limitation of the allowable stress rule BV and the objective function of minimizing weight of bilge structure. To determine the variations and scantlings, researcher must refer to the existing model, which is Tanker 17500 DWT. The result of the bilge structure optimization will be analyzed with finite element software. The model that is analyzed is a compartment with a length of 3 m. From the optimization result, bilge structure with combination construction, especially 3rd variation, has the minimum structural weight, that is 5,970 tons. This model has a length of 3 m. This variation has maximum stress, that is 74,136 MPa. The weight of this structure is 6,088% lighter than the existing model.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Bilge Structure, Finite Element Method, Longitudinal Construction, Optimization, Transverse Construction, Konstruksi Memanjang, Konstruksi Melintang, Metode Elemen Hingga, Optimasi, Struktur Bilga
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Dea Putri Ubaidah
Date Deposited:	06 Aug 2024 07:26
Last Modified:	06 Aug 2024 07:26
URI:	http://repository.its.ac.id/id/eprint/112771

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