Analisa Getaran Pada Engine Room Kapal Akibat Repowering Menggunakan Finite Element Method

Fildzah, Muhammad Fildzah (2025) Analisa Getaran Pada Engine Room Kapal Akibat Repowering Menggunakan Finite Element Method. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini menganalisis dampak pergantian mesin pada kapal berukuran 84 meter yang sedang mengadakan repowering, repowering tersebut menggantikan spesifikasi mesin utama yang digunakan oleh kapal dan secara langsung merubah rancangan pada dudukan mesin (engine bed), perubahan tersebut akan mempengaruhi getaran yang terjadi pada ruang mesin dan strukturnya dan menggunakan metode elemen hingga (FEA) penelitian ini bertujuan untuk melihat dampak getaran akibat repowering tersebut. Model 3D ruang mesin mencakup gading
ke-59 sampai dengan ke-81 menggunakan simulasi beban yang dapat dijumpai di lapangan seperti rotasi torsional serta tekanan hidrostatis yang terjadi pada struktur. Analisis frekuensi alami dilakukan dengan jarak pencarian frekuensi 60Hz sampai dengan 210Hz dan ditemukan sebanyak 1625 mode shapes pada daerah ruang mesin kapal, mencocokan dengan frekuensi eksitasi yang dihasilkan oleh mesin didapatkan titik resonansi yang terjadi pada mode ke-779 frekeunsi alami ruang mesin, dimana resonansi terjadi antara deck plate dan bulkhead ruang mesin maka disarankan pengunaan stiffener untuk mengurangi getaran yang terjadi.
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This study analyses the impact caused by an engine replacement on an 84-meter vessel undergoing repowering. The repowering process involves replacing the main engine specifications used by the ship, which directly alters the design of the engine bed. This change affects the vibrations occurring in the engine room and its structure. Using the Finite Element Analysis (FEA) method, the study aims to assess the impact of vibrations resulting from the repowering. The 3D model of the engine room covers frames 59 to 81 and simulates loads commonly encountered in the field, such as torsional rotation and hydrostatic pressure acting on the structure. A natural frequency analysis was conducted within a frequency search range of 60 Hz to 210 Hz, revealing 1625 mode shapes in the ship's engine room area. Matching these with the excitation frequency generated by the engine, a resonance point was identified at mode 779 of the engine room's natural frequency. Resonance occurred between the deck plate and the engine room bulkhead, thus the use of stiffeners is recommended to reduce the resulting vibrations.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Frekuensi Alami, Frekuensi Eksitasi, Getaran, Metode Elemen Hingga,Resonansi, Repowering, Ruang Mesin, Engine Bed, Exitacion Frequency, Finite Element Analysis, Natural Frequency, Resonance, Vibration
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA174 Computer-aided design. T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA355 Vibration. T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM731 Marine Engines
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Muhammad Fildzah
Date Deposited:	04 Aug 2025 05:55
Last Modified:	04 Aug 2025 05:55
URI:	http://repository.its.ac.id/id/eprint/126928

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