Mahardika, Intan (2018) Studi Eksperimen dan Analisa Reduksi Respon Getaran Translasi, Rolling, dan Pitching menggunakan Sistem Translational Mass Vibration Absorber (TMVA). Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Setiap peralatan mekanis dan mesin-mesin, akan mengalami getaran ketika beroperasi. Ketika besarnya frekuensi getaran sama dengan frekuensi natural sistem, maka dapat mengakibatkan penurunan efisiensi dan memperpendek umur pakai mesin. Salah satu cara untuk mencegahnya yaitu dengan penambahan komponen pereduksi getaran, yang disebut dengan DVA (Dynamic Vibration Absober). Pada tahun 2017, telah dilakukan penelitian mengenai DVA model beam oleh Ricky Bramudia Kurniawan dan Vincent. Namun, rancang bangun pada penelitian tersebut cukup kompleks. Sehingga dalam penelitian ini, penulis akan msembahas alternatif rancang bangun DVA dengan desain yang lebih sederhana menggunakan sistem utama yang telah disempurnakan pada penelitian Nauval Adhytia.
Pada penelitian tugas akhir ini, dilakukan rancang bangun dan studi eksperimental mengenai mekanisme kerja sebuah peredam dengan gerakan translasi vertikal saja, yang disebut TMVA (Translational Mass Vibration Absorber). TMVA didesain berbentuk selongsong silinder yang berisi beberapa koin besi sebagai massa peredam dengan sebuah pegas dibawahnya. TMVA tersebut diletakkan di atas sistem utama yang terdiri dari plat exciter, spring rod suspensi, dan poros penggerak. Sistem utama diatur agar bergerak dalam 3 DOF, yaitu arah translasi, rolling, dan pitching dengan penggantian keempat pegas yang memiliki nilai koefisien berbeda. Variasi yang digunakan yaitu, jumlah koin pemberat dan posisi peletakan TMVA.
Eksperimen dilakukan dalam dua kondisi, yaitu kondisi sistem utama sebelum dan setelah ditambahkan TMVA. Didapatkan hasil berupa respon percepatan dan persentase reduksi untuk setiap variasi jumlah koin dan posisi TMVA. Dari hasil eksperimen dapat disimpulkan bahwa penambahan 4 koin pada TMVA, paling efektif dalam mereduksi getaran sistem utama. Dan peletakan TMVA pada node 7 variasi 4 koin paling baik dalam meredam getaran 3 dof dari sistem utama, dengan nilai reduksi untuk translasi sebesar 93,65%, rolling 84,28%, dan pitching 90,98%.
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Every mechanical equipments and machineries will experience vibrations as they operate. If such vibrations' frequency happen to be equal to a system's natural frequency, the result will be a degradation of the equipments efficiency and shortening of its working lifespan. One way to avoid this is an addition of a vibration reducing equipment known as DVA (Dynamic Vibration Absorber). In 2017, a study has been conducted on a beam-type DVA by Ricky Bramudia Kurniawan and Vincent. However, this type of DVA design was complex and complicated. Therefore, in this paper, the writer will propose and discuss an alternative of the DVA with a much simpler design using a main system that has been improved on Nauval Adhytia's theses.
In this final project paper, the writer will propose a ground-up design and experimental study of a working mechanics of a vibration absorber that is made to be exclusively translational in motion, called the TMVA (Translational Mass Vibration Absorber). This TMVA is a cylindrical which houses a few solid steel coins that act as absorbing mass that are attached to a spring beneath them. This TMVA is then attached on top of the main system comprising an exciter plate, a spring rod suspension, and a mover shaft. The main system in this final project is design to be able to move in 3 DOF's, which are translational, rolling, and pitching. The 4 springs are on each corner with varying stiffness coefficient. Variables to be used are the number of coins used and where the TMVA are placed on top of the main system.
The experiment were done in two differing conditions. The first one being the main system only without the addition of the TMVA, and the second one, the main system with the TMVA attached. The results gathered are acceleration response and reduction percentage values for each variation of number of coins used and the position of the TMVA. From this experiment, it can be concluded that the use of 4 coins is the most effective in reducing the main system's vibration. Position wise, attachment of the TMVA on node 7 with 4 coins is the most effective in reducing 3 DOF vibrations from the main system, with reduction values reaching as high as 93.65%, 84.28%, and 90.98% in translational, rolling, and pitching motion respectively.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 629.243 Mah s-1 3100018076964 |
| Uncontrolled Keywords: | getaran multi DOF, jumlah koin, posisi TMVA, respon getaran, Translational Mass Vibration Absorber |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL257 Springs and suspension T Technology > TL Motor vehicles. Aeronautics. Astronautics > TL257.5 Automobiles--Shock absorbers--Design and construction. |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Intan Mahardika |
| Date Deposited: | 13 Nov 2020 11:41 |
| Last Modified: | 13 Nov 2020 11:41 |
| URI: | http://repository.its.ac.id/id/eprint/55593 |
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