STRUCTURAL OPTIMIZATION AND REGULATORY COMPLIANCE ASSESSMENT OF THE DOUBLE BOTTOM FOR THE NK-CLASSED BULK CARRIER IKAN BILIS (75,500 DWT)

Radian, Hayykal Athala (2025) STRUCTURAL OPTIMIZATION AND REGULATORY COMPLIANCE ASSESSMENT OF THE DOUBLE BOTTOM FOR THE NK-CLASSED BULK CARRIER IKAN BILIS (75,500 DWT). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

The structural optimization of bulk carrier double-bottom configurations is a significant challenge in contemporary ship design, directly influencing material efficiency, construction expenses, and vessel safety. This study examines the double bottom structure of the NK-classed bulk carrier IKAN BILIS (75,500 DWT) within the cargo hold region. A detailed finite element model was created in ANSYS, utilizing actual ship data and adhering rigorously to the most recent ClassNK and IACS Common Structural Rules (CSR). The model includes all pertinent structural elements, such as tank top plating, bottom shell, longitudinal stiffeners, side girders, and transverse floors, along with operational features like manholes and lightening holes. A baseline structural analysis was performed under static load conditions, encompassing cargo pressure, hydrostatic pressure, and self-weight, to identify critical stress concentrations and assess adherence to regulatory limits. The findings indicated that, although the current design offers considerable safety margins, there exists substantial potential for material optimization. An iterative optimization process was executed, methodically decreasing the thickness of the tank top and the longitudinal stiffeners of the inner bottom. Finite element analysis was employed at each stage to verify that the von Mises stress, deflection, and all regulatory standards adhered to the permissible limits established by ClassNK and IACS CSR. The optimized configuration exhibited a significant reduction in steel consumption and total structural weight, achieving a 7.03% decrease in double bottom weight relative to the baseline, while fully adhering to all regulatory standards and preserving structural integrity. These findings underscore the efficacy of FEA-driven optimization in ship structural design and endorse the prevailing industry trend towards sustainable, cost-efficient, and high-performance bulk carrier construction. The methodology established in this study is widely applicable to analogous optimization challenges in shipbuilding and other large-scale engineering structures.
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Optimasi struktural konfigurasi dasar ganda pada kapal kargo curah merupakan tantangan signifikan dalam desain kapal modern, yang secara langsung memengaruhi efisiensi material, biaya konstruksi, dan keselamatan kapal. Studi ini menganalisis struktur dasar ganda pada kapal kargo curah kelas NK IKAN BILIS (75.500 DWT) di wilayah ruang muatan. Model elemen hingga terperinci dibuat di ANSYS, menggunakan data kapal aktual dan mematuhi secara ketat aturan struktural terbaru ClassNK dan IACS Common Structural Rules (CSR). Model ini mencakup semua elemen struktural yang relevan, seperti pelat atap tangki, cangkang bawah, penahan longitudinal, balok samping, dan lantai transversal, serta fitur operasional seperti lubang akses dan lubang
pembebanan. Analisis struktural dasar dilakukan di bawah kondisi beban statis, mencakup tekanan muatan, tekanan hidrostatik, dan berat sendiri, untuk mengidentifikasi konsentrasi tegangan kritis dan mengevaluasi kepatuhan terhadap batas regulasi. Temuan menunjukkan bahwa, meskipun desain saat ini menawarkan margin keamanan yang signifikan, terdapat potensi besar untuk optimasi material. Proses optimasi iteratif dilakukan, secara sistematis mengurangi ketebalan pelat atap tangki dan penahan longitudinal bagian bawah dalam. Analisis elemen hingga (FEA)
digunakan pada setiap tahap untuk memverifikasi bahwa tegangan von Mises, defleksi, dan semua standar regulasi mematuhi batas-batas yang diperbolehkan yang ditetapkan oleh ClassNK dan IACS CSR. Konfigurasi yang dioptimalkan menunjukkan pengurangan signifikan dalam konsumsi baja dan berat struktural total, mencapai pengurangan 7,03% dalam berat dasar ganda dibandingkan dengan baseline, sambil tetap mematuhi semua standar regulasi dan menjaga integritas struktural. Temuan ini menyoroti efektivitas optimasi berbasis FEA dalam desain struktural kapal dan mendukung tren industri yang berkembang menuju konstruksi kapal kargo curah yang berkelanjutan, efisien biaya, dan
berkinerja tinggi. Metodologi yang dikembangkan dalam studi ini dapat diterapkan secara luas pada tantangan optimasi serupa dalam industri galangan kapal dan struktur teknik berskala besar lainnya.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	bulk carrier, double bottom, structural optimization, finite element analysis, ClassNK, IACS CSR, ANSYS, regulatory compliance.
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Hayykal Athala Radian
Date Deposited:	04 Aug 2025 05:56
Last Modified:	04 Aug 2025 05:56
URI:	http://repository.its.ac.id/id/eprint/126261

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