Local Vibration Analysis and Lightweight Design of 1st Deck in Engine Room by Using Finite Element Method Software

Ramadani, Bintan Marsha (2023) Local Vibration Analysis and Lightweight Design of 1st Deck in Engine Room by Using Finite Element Method Software. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Dek pertama di ruang mesin kapal mengalami kebisingan dan getaran tingkat tinggi yang dihasilkan oleh mesin, pompa, dan mesin. Hal ini dapat menyebabkan kerusakan struktural, kelelahan, dan potensi bahaya keselamatan. Analisis getaran lokal dan desain yang ringan sangat penting dalam memastikan integritas dan kinerja geladak. Studi ini berfokus pada pemanfaatan perangkat lunak metode elemen hingga (FEM) untuk menganalisis getaran dan mengoptimalkan desain geladak. Tujuannya adalah untuk mengidentifikasi area dengan tegangan tinggi dan mengusulkan modifikasi desain untuk menjaga tegangan di bawah batas yang diijinkan. Resonansi juga diatasi dengan mengevaluasi frekuensi geladak dan mencegahnya mencocokkan frekuensi mesin utama dan baling-baling. Tiga desain dengan berbagai ukuran pengaku dan ketebalan geladak dipertimbangkan. Analisis statis dan frekuensi dilakukan dengan menggunakan perangkat lunak MSC Patran/Nastran FEM. Nilai tegangan maksimum diperoleh melalui analisis statis, dan semua desain tetap berada dalam batas tegangan yang diijinkan. Tegangan maksimum berkisar antara 60,3 MPa hingga 83,3 MPa, menunjukkan faktor keamanan geladak terpenuhi. Analisis frekuensi mengungkapkan frekuensi yang signifikan dalam empat mode untuk setiap desain, berbeda dari frekuensi mesin utama dan baling-baling. Namun, memodifikasi desain menghasilkan penurunan nilai frekuensi di keempat mode. Diagram Campbell digunakan untuk menilai resonansi dengan membandingkan frekuensi geladak dengan mesin utama dan baling-baling. Hasil menunjukkan bahwa tidak ada desain yang menunjukkan resonansi, karena tidak ada frekuensi yang cocok yang diamati.
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The first deck in the engine room of a vessel is subjected to high levels of noise and vibration generated by engines, pumps, and machinery. This can lead to structural damage, fatigue, and potential safety hazards. Local vibration analysis and lightweight design are crucial in ensuring the integrity and performance of the deck. This study focuses on utilizing finite element method (FEM) software for analyzing vibrations and optimizing the deck's design. The objective is to identify areas of high stress and propose design modifications to keep stress below allowable limits. Resonance is also addressed by evaluating the deck's frequency and preventing it from matching the frequencies of the main engine and propeller. Three designs with varying stiffener sizes and deck thicknesses were considered. Static and frequency analyses were performed using MSC Patran/Nastran FEM software. Maximum stress values were obtained through static analysis, and all designs remained within allowable stress limits. The maximum stress ranged from 60.3 MPa to 83.3 MPa, indicating the deck's safety factor was met. Frequency analysis revealed significant frequencies in four modes for each design, distinct from the frequencies of the main engine and propeller. However, modifying the design resulted in a decrease in frequency values across the four modes. The Campbell diagram was employed to assess resonance by comparing the deck's frequency with that of the main engine and propeller. Results indicated that none of the designs exhibited resonance, as no matching frequencies were observed.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	First deck of Engine room, FEM, Resonance, Stress.
Subjects:	V Naval Science > V Naval Science (General) > V220 Naval ports, bases, reservations, docks, etc.
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Bintan Marsha Ramadani
Date Deposited:	25 Sep 2023 03:16
Last Modified:	25 Sep 2023 03:16
URI:	http://repository.its.ac.id/id/eprint/104027

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