Analisis Frekuensi Alami Ruang Mesin Kapal Wisata Trimaran Glass Bottom Menggunakan Metode Elemen Hingga

Saputra, Ahmad Haris (2023) Analisis Frekuensi Alami Ruang Mesin Kapal Wisata Trimaran Glass Bottom Menggunakan Metode Elemen Hingga. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kapal wisata trimaran glass bottom adalah kapal wisata yang pada dasar dan sisi lambung dilengkapi dengan kaca. Kapal ini dirancang sebagai salah satu alternatif cara untuk menikmati keindahan bawah laut. Kapal bergerak karena adanya sistem propulsor yang menghasilkan gaya dorong. Sehingga memungkin adanya getaran dari sistem propulsor. Getaran yang berlebih menyebabkan kegagalan struktur dan ketidak nyamanan crew. Oleh karena itu getaran kapal harus sesuai standar yang ada. Salah satu standar yang digunakan yaitu ISO 6954. Hal yang perlu dihindari dari getaran adalah resonansi. Resonansi terjadi jika nilai frekuensi alami sama dengan frekuensi eksitasi. Tujuan dari penelitian ini untuk mengetahui nilai frekuensi dari kamar mesin kapal wisata trimaran glass bottom. Frekuensi alami yang ditampilkan berjumlah 50 mode. Sehingga dapat dibandingkan dengan frekuensi eksitasi dari mesin. Frekuensi eksitasi digunakan variasi rpm mesin. Pada kamar mesin terjadi resonansi pada mode 8,9,13,14,38,39,40 dan 41. Sehingga dilakukan modifikasi struktur untuk menambah kekakuan. Dilakukan modifikasi dengan penambahan penguat dan menambah ukuran profil. Setelah dilakukan modifikasi tidak lagi terjadi resonansi. Kemudian dilakukan analisa untuk mencari amplitudo. Didapatkan amplitudo berupa displacement, velocity dan acceleration. Didapat nilai velocity sebesar 4.91x10-3 mm/s untuk model existing dan 9x10-3 mm/s untuk model modifikasi. Berdasarkan nilai tersebut model existing dan model modifikasi sesuai dengan standar ISO 6954.
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The glass bottom trimaran tour boat is a tour boat that is equipped with glass on the bottom and sides of the hull. This ship is designed as an alternative way to enjoy the beauty of the underwater. The ship moves because of the propulsor system that produces thrust. So that there is a possibility of vibration from the propulsor system. Excessive vibration causes structural failure and crew discomfort. Therefore, ship vibrations must comply with existing standards. One of the standards used is ISO 6954. The thing that needs to be avoided from vibration is resonance. Resonance occurs when the natural frequency value is equal to the excitation frequency. The purpose of this study is to determine the frequency value of the engine room of the trimaran glass bottom tourist ship. The natural frequencies displayed are 50 modes. So that it can be compared with the excitation frequency of the engine. The excitation frequency is used engine rpm variation. In the engine room resonance occurs in modes 8, 9, 13, 14, 38, 39, 40 and 41. So that structural modifications are made to increase rigidity. Modifications were made by adding reinforcement and increasing the profile size. After the modification, resonance no longer occurs. Then the analysis is carried out to find the amplitude. Amplitude is obtained in the form of displacement, velocity and acceleration. The velocity value was 4.91x10-3 mm/s for the existing model and 9x10-3 mm/s for the modified model. Based on these values, the existing model and the modified model comply with the ISO 6954 standard.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Trimaran, Vibration, Frequency, Resonance, Trimaran, Getaran,Frekuensi, Resonansi
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 > VM731 Marine Engines
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Ahmad Haris Saputra
Date Deposited:	05 Aug 2023 08:42
Last Modified:	05 Aug 2023 08:42
URI:	http://repository.its.ac.id/id/eprint/103430

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