Natural Frequency Analysis on The Superstructure of The Trimaran Glass Bottom Tourist Boat

Putri, Dinanda Citadara Pastima (2023) Natural Frequency Analysis on The Superstructure of The Trimaran Glass Bottom Tourist Boat. Other thesis, Institut Teknologi Sepuluh Nopember.

Text 04111942000021-Undergraduate_Thesis.pdf - Accepted Version Restricted to Repository staff only until 1 September 2025. Download (13MB)

Abstract

Trimaran Glass Bottom Boat merupakan salah satu transportasi wisata bahari yang ada di Indonesia. Saat kapal sedang bergerak, ia mengalami getaran atau eksitasi, terutama dari baling-baling dan mesin kapal. Getaran tersebut menimbulkan osilasi pada bagian atas Kapal Wisata Glass Bottom Trimaran sehingga menimbulkan ketidaknyamanan bagi penumpang dan awak kapal. Tujuan dari penelitian ini adalah untuk mengetahui frekuensi natural yang terjadi pada kondisi eksisting kapal dengan ketebalan pelat 6 mm, dan mengetahui apakah penambahan perkuatan dan variasi ketebalan pelat akan mempengaruhi kenyamanan awak kapal dan penumpang di atas kapal. Bagian Bawah Kaca Trimaran. Metode elemen hingga digunakan untuk memperoleh nilai frekuensi natural, dengan menggunakan syarat batas encastre pada penelitian ini. Hasil frekuensi disajikan dalam 20 mode. Selanjutnya dilakukan analisis untuk memperoleh nilai percepatan, kecepatan, dan perpindahan. Kemudian dilakukan perbandingan nilai kecepatan yang diperoleh masing-masing model dengan menggunakan kriteria ABS. Nilai kecepatan yang diperoleh pada kondisi eksisting dengan tebal pelat 6 mm sebesar 228,648 mm/s, dengan tebal 8 mm sebesar 166,77 mm/s, dengan tebal 10 mm sebesar 78,572 mm/s, dengan dengan ketebalan 11 mm adalah 35.400 mm/s, dan dengan ketebalan 12 mm adalah 29.582 mm/s. Selanjutnya pada kondisi eksisting dengan penambahan tulangan 6 mm nilai kecepatannya sebesar 209,372 mm/s, dengan tulangan pelat 8 mm sebesar 196,656 mm/s, dan dengan tulangan pelat 12 mm sebesar 33,085 mm/s. . Berdasarkan nilai kecepatan yang diperoleh dari model eksisting dan model dengan pengaku serta ketebalan yang bervariasi, nilai tersebut tidak memenuhi standar ISO 6954.
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Trimaran Glass Bottom Boat is a one of maritime tourism transportation in Indonesia. When the ship is in motion, it experiences vibrations or excitations, primarily from the propellers and machinery of the ship. These vibrations induce oscillations in the superstructure of the Glass Bottom Trimaran Tourist Ship, leading to discomfort among the passengers and crew. The aim of this study is to determine the natural frequencies occurring in the existing ship conditions with a plate thickness of 6 mm, and to investigate whether the addition of reinforcements and variations in plate thickness would affect the comfort of the crew and passengers aboard the Kapal Trimaran Glass Bottom. The finite element method is employed to obtain the natural frequency values, using the encastre boundary condition for this research. The frequency results are presented in 20 modes. Subsequently, an analysis is performed to acquire acceleration, velocity, and displacement values. Then, a comparison is made of the velocity values obtained for each model using the ABS criteria. The velocity values obtained for the existing condition with a plate thickness of 6 mm are 228.648 mm/s, with a thickness of 8 mm, it is 166.77 mm/s, with a thickness of 10 mm, it is 78.572 mm/s, with a thickness of 11 mm, it is 35.400 mm/s, and with a thickness of 12 mm, it is 29.582 mm/s. Furthermore, in the existing condition with an additional 6 mm reinforcement, the velocity value is 209.372 mm/s, with an 8 mm plate reinforcement, it is 196.656 mm/s, and with a 12 mm plate reinforcement, it is 33.085 mm/s. Based on the velocity values obtained from the existing model and the model with stiffeners and various thicknesses, these values do not comply with ISO 6954 standards.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Vibration, Natural Frequency, Finite Element Method, Plate Thickness, and Stiffeners.
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM311 Catamarans. V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM381 Passenger ships
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Dinanda Citadara Pastima Putri
Date Deposited:	09 Oct 2023 01:27
Last Modified:	09 Oct 2023 01:27
URI:	http://repository.its.ac.id/id/eprint/103464

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