Structural Analysis and Lightweight Design of Machinery Seats in Double Bottom Structure

Nalayudha, Muhammad Rayhan (2025) Structural Analysis and Lightweight Design of Machinery Seats in Double Bottom Structure. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Tesis ini menyajikan penilaian struktural komparatif dan optimasi ringan dari rakitan dudukan mesin cermin untuk aplikasi kelautan. Tiga variasi desain dikembangkan: konfigurasi dasar dengan ketebalan konvensional, dan dua alternatif ringan yang dicapai dengan secara sistematis mengurangi ketebalan pelat atas tangki, pengaku vertikal, dan dudukan mesin. Setiap variasi dievaluasi menggunakan perhitungan tangan analitis dan analisis elemen hingga (FEA) dalam ANSYS Static Structural, dengan semua model berbagi geometri yang konsisten, kondisi batas, dan skenario pembebanan. Desain dasar, yang menampilkan ketebalan atas tangki 5 mm, pengaku 10 mm, dan dudukan mesin 20 mm, menunjukkan margin keamanan yang kuat, dengan tegangan dan lendutan normal hanya 9,3% dan 1,1% dari batas yang diizinkan masing-masing. Variasi ringan menunjukkan penghematan material yang signifikan: Variasi 1 mencapai pengurangan 18,3%, Variasi 2 mencapai 32,5%, dan Variasi 3 mewujudkan pengurangan 45,2% dibandingkan dengan dasar. Melalui kalibrasi metodologi perhitungan manual menggunakan faktor koreksi turunan FEA, hasil untuk semua parameter tegangan dan defleksi utama diselaraskan dalam kisaran 2,5% antara pendekatan analitis dan numerik. Semua desain divalidasi terhadap standar DNV-GL, dengan mempertahankan tegangan von Mises jauh di bawah 16% dari batas yang diizinkan, yaitu 200 MPa, dan defleksi di bawah 1,4% dari nilai yang diizinkan. Studi ini menegaskan bahwa pengurangan berat yang substansial dapat dicapai melalui optimasi ketebalan yang strategis tanpa mengorbankan integritas struktural, memberikan panduan praktis untuk desain rakitan dudukan mesin kelautan ringan yang efisien dan andal
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This thesis presents a comparative structural assessment and lightweight optimization of a mirrored machinery seat assembly for marine applications. Three design variations were developed: a baseline configuration with conventional thicknesses, and two lightweight alternatives achieved by systematically reducing the thickness of the tank top plating, vertical stiffeners, and engine seats. Each variation was evaluated using both analytical hand calculations and finite element analysis (FEA) in ANSYS Static Structural, with all models sharing consistent geometry, boundary conditions, and loading scenarios. The baseline design, featuring a thickness of 5 mm tank top, 10 mm stiffeners, and 20 mm engine seats, exhibited robust safety margins, with normal stress and deflection at only 9.3% and 1.1% of their respective allowable limits. The lightweight variations demonstrated significant material savings: Variation 1 achieved an 18.3% reduction, Variation 2 reached 32.5%, and Variation 3 realized a 45.2% reduction compared to the baseline. Through calibration of the hand calculation methodology using FEA-derived correction factors, the results for all key stress and deflection parameters were aligned within 2.5% between analytical and numerical approaches. All designs were validated against DNV-GL standards, maintaining von Mises stresses well below 16% of the allowable limit of 200 MPa and deflections under 1.4% of the permissible value. This study confirms that substantial weight reduction is achievable through strategic thickness optimization without compromising structural integrity, providing practical guidance for the efficient and reliable design of lightweight marine machinery seat assemblies

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Structural Analysis, Lightweight Design, Machinery Seats, Double-Bottom Structure, FEA, Vibration Analysis, ANSYS.
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM297 Ships Designs and drawings
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Muhammad Rayhan Nalayudha
Date Deposited:	06 Aug 2025 01:54
Last Modified:	06 Aug 2025 01:54
URI:	http://repository.its.ac.id/id/eprint/127636

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