Local Vibration Analysis and Lightweight Design of Elevation Panel in Engine Room Structure

Wicaksana, Permana Agung (2024) Local Vibration Analysis and Lightweight Design of Elevation Panel in Engine Room Structure. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Getaran adalah sebuah hal yang harus dihindari atau dikurangi dan diperhatikan, khususnya pada sebuah konstruksi kapal. Jika konstruksi kapal secara terus-menerus mengalami getaran maka beresiko besar mengakibatkan kerusakan dan kegagalan struktur. Hal ini terjadi jika besarnya frekuensi alami sama dengan frekuensi eksitasi badan kapal atau yang disebut dengan resonansi. Selain itu, kekuatan kapal juga merupakan aspek penting yang perlu diperhatikan. Suatu struktur kosntruksi didesain untuk mampu bertahan dari berbagai beban kerja yang dialaminya. Konstruksi juga disarankan dibangun seringan mungkin tanpa mengurangi batasan kekuatan yang telah ditentukan klasifikasi, sehingga akan lebih menguntungkan dalam segi finansial. Penelitian ini bertujuan untuk menganalisis kekuatan struktur dan potensi terjadinya resonansi pada Crude Oil Tanker secara lokal, yaitu pada panel elevasi di kamar mesin. Tiga desain dengan variasi ukuran pengaku dan ketebalan pelat yang berbeda-beda dipertimbangkan. Analisis linear statis dan frekuensi dilakukan dengan menggunakan perangkat lunak HyperMesh, HyperView dan MSC Nastran. Nilai tegangan maksimum yang diperoleh dari setiap model tetap berada dalam batas tegangan ijin. Tegangan maksimum berkisar antara 74,82 MPa hingga 92,44 MPa, yang menunjukkan faktor keamanan panel terpenuhi. Selanjutnya, Diagram Campbell digunakan untuk menilai resonansi dengan membandingkan frekuensi alami panel dengan frekuensi eksitasi mesin utama dan baling-baling. Hasil menunjukkan frekuensi alami pada model pertama sebesar 14,69 Hz, kedua 13,95 Hz, dan ketiga 12,56 Hz. Hasil tersebut menunjukkan bahwa tidak ada model yang menunjukkan resonansi, hal ini karena frekuensi alami lebih besar dari frekuensi eksitasi mesin induk dan baling-baling yang hanya berkisar 8,7 dan 5,8 Hz.
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Vibration is something that should be avoided or minimized and carefully observed, especially in ship construction. If the ship's construction continously experiences vibrations, it poses a significant risk of damage and structural failure. This occurs when the natural frequency is equal to the excitation frequency of the ship's body, also known as resonance. Furthermore, the strenght of the ship is also an important aspect that needs to be considered, a constructuin structure is designed to be able to withstand various workloads. It is recommended to build the construction as light as possible without compromissing the predetermined strength limits set by classification so that it would be more advantageous financially. This research aims to analyze the structural strength and the potential for resonance occurrence in Crude Oil Tankers locally, specifically on the elevation panels in the engine room. Three different designs with varying stiffener sizes and plate thicknesses are considered. Linear static analysis and frequency analysis are conducted using the software tools HyperMesh, HyperView, and MSC Nastran. The maximum stress value obtained from each model remains within the allowable stress limits. The maximum stress ranges from 74.82 MPa to 92.44 MPa, which indicates the deck safety factor is met. Furthermore, Campbell's Diagram is used to assess resonance by comparing the natural frequency of the panel with the excitation frequency of the main engine and propeller. The result showed that the natural frequency in the first model was 14.69 Hz, the second was 13.95 Hz, and the third was 12.56 Hz. These results show that none of the models exhibit resonance, this is beacuse the natural frequencies are greater than the excitation frequency of the main engine and propeller, which is only around 8.7 and 5.8 Hz.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Frekuensi, Resonansi, Tegangan, Getaran, Frequency, Resonance, Stress, Vibration
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM156 Naval architecture V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM163 Hulls (Naval architecture)
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Permana Agung Wicaksana
Date Deposited:	13 Aug 2024 07:04
Last Modified:	13 Aug 2024 07:04
URI:	http://repository.its.ac.id/id/eprint/115214

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