Al Hamra, Freidy Zakaria (2020) Studi Eksperimen dan Analisis Reduksi Respon Getaran Transversal pada Sistem Utama(Pipa Elbow 90o ) oleh Mekanisme Dynamic Vibration Absorber (DVA) tipe Beam Akibat Pengaruh Posisi Peletakan DVA. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pabrik industri mempunyai banyak sistem perpipaan terutama pada industri minyak , gas dan pengilangan minyak, industri air minum, pabrik yang memproduksi bahan kimia serta obat-obatan, dan juga industri pembangkit yang menyediakan sumber listrik untuk masyarakat. Sistem perpipaan adalah suatu sistem yang digunakan untuk transportasi fluida antar equipment dari suatu tempat ke tempat yang lain sehingga proses produksi dapat berlangsung. Aliran fluida pada pipa dapat memberi tekanan yang kemudian timbul getaran pada sistem perpipaan. Getaran berlebih adalah suatu hal yang tidak diharapkan muncul dalam sebuah sistem perpipaan. Getaran yang berlebih dapat terjadi karena frekuensi operasional suatu benda sama dengan frekuensi natural sistem tentunya berpengaruh terhadap performa maupun umur kekuatan dari sistem perpipaan. Getaran yang berlebih harus diredam dengan DVA (Dynamic vibration absorber). DVA (Dynamic vibration absorber) yang terpasang pada sistem perpipaan tersusun dari massa dan beam untuk mereduksi respon getaran transversal. Dalam penelitian tugas akhir ini menguji ulang mekanisme DVA (Dynamic vibration absorber) tipe beam dengan melihat pengaruh posisi peletakan DVA terhadap respon getaran pada sistem utama. Variasi yang digunakan adalah posisi peletakkan DVA pada 3 titik, variasi kecepatan aliran fluida yang melewati sistem utama sebesar 0,3 m/s; 0,5 m/s; 0,7 m/s, dan variasi rasio massa DVA 1/30,1/20,1/10 dari massa sistem utama. DVA tersebut dipasang pada sistem utama berupa fitting perpipaan jenis elbow 90º. Sistem utama diatur agar bergerak dalam 2 DOF, yaitu Translasi ke arah horizontal(x) dan vertikal(y) dengan ditumpu clamp fixed sebelum dan setelah pipa elbow 90º. Eksperimen ini dilakukan dengan dua kondisi, yaitu sistem utama tanpa penambahan DVA dan sistem utama dengan penambahan DVA. Didapatkan hasil berupa respon percepatan getaran, persentase reduksi. Berdasarkan hasil eksperimen dapat disimpulkan bahwa penambahan massa peredam 1/10 dari massa pipa elbow 90º yang direpresentasikan dengan koin mampu meredam secara efektif sebesar 55,97% getaran ke arah vertikal dan 31,73% getaran ke arah horizontal pada kecepatan aliran 0,3 m/s. Selain itu, posisi peletakan DVA mempengaruhi besarnya respon percepatan getaran yang dihasilkan, dibuktikan bahwa peletakan posisi DVA pada posisi Bend sangat meredam respon getaran. Semakin besar rasio massa DVA dari massa sistem utama maka semakin meredam untuk respon getaran dari sistem utama.
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Industrial plants have many piping systems, especially in the oil, gas and oil refining industries, the drinking water industry, factories that produce chemicals and medicines, and also the power industry that provides electricity to the community. Piping system is a system used to transport fluid between equipment from one place to another so that the production process can take place. Fluid flow in the pipe can put pressure which then emits a vibration in the piping system. Over vibration is something that is not expected to appear in a piping system. Excess vibrations can occur because the operational frequency of an object is the same as the natural frequency of the system, which certainly affects the performance and strength of the piping system. Excessive vibration must be damped with DVA (Dynamic vibration absorber). DVA (Dynamic vibration absorber) mounted on a piping system is composed of mass and beam to reduce the transverse vibration response. In this final project, retest the beam type dynamic vibration absorber DVA mechanism by looking at the influence of the positioning of the DVA on the vibration response in the main system. The variation used is the position of the placement of DVA at 3 points, variations in the speed of fluid flow through the main system of 0.3 m / s; 0.5 m / s; 0.7 m / s, and variations in the mass ratio of DVA 1 / 30.1 / 20.1 / 10 of the mass of the main system. The DVA is installed in the main system in the form of a 90º elbow piping type. The main system is set to move in 2 DOF, namely horizontal (x) and vertical (y) translation with a fixed clamp supported before and after the 90º elbow pipe. This experiment was carried out with two conditions, namely the main system without the addition of DVA and the main system with the addition of DVA. The results obtained in the form of the response of the acceleration of vibration, the percentage reduction. Based on the experimental results it can be concluded that the addition of 1/10 dampening mass of 90º elbow pipe mass represented by coins can effectively reduce 55.97% of vibrations in the vertical direction and 31.73% of vibrations in the horizontal direction at a flow velocity of 0.3 m / s. In addition, the positioning of the DVA affects the magnitude of the resulting acceleration of vibration response, it is proven that the placement of the DVA position at the Bend position greatly dampens the vibration response. The greater the ratio of the mass of the DVA from the mass of the main system, the more damping for the vibration response of the main system.
| Item Type: | Thesis (Other) |
|---|---|
| Additional Information: | RSM 620.3 Alh s-1 2020 |
| Uncontrolled Keywords: | pipa elbow 90º, Dynamic Vibration Absorber (DVA), Getaran pipa |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA355 Vibration. T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design T Technology > TJ Mechanical engineering and machinery > TJ930 Pipelines (General). Underwater pipelines. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Al Hamra Freidy Zakaria |
| Date Deposited: | 30 Aug 2023 04:43 |
| Last Modified: | 30 Aug 2023 04:43 |
| URI: | http://repository.its.ac.id/id/eprint/73202 |
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