Rohman, Abdul (2016) Pengaruh Perubahan Posisi Sumber Eksitasi Dan Massa Dva Dari Titik Berat Massa Beam Terhadap Karakteristik Getaran Translasi Dan Rotasi. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penggunaan DVA (dynamic vibration absorber) adalah untuk mereduksi
getaran translasi dan rotasi getaran yang berlebih dari frekuensi natural sistem.
Pada penelitian ini dilakukan dengan memberikan pengaruh perubahan posisi
sumber eksitasi dan perubahan rasio lengan momen SDVA dari titik berat massa
sistem utama disepanjang beam terhadap karakteristik getaran translasi dan rotasi.
Setelah penambahan DVA tentunya menambah jumlah derajat kebebasan 2
menjadi 3 DOF (degree of freedom). Sistem utama dimodelkan secara matematis
dan dilakukan simulasi untuk mengetahui perubahan karakteristik respon getaran
yang terjadi. Dalam simulasi diberikan perubahan pada jarak lengan eksitasi
SDVA terhadap pusat massa sistem utama, perubahan jarak lengan momen,
frekuensi eksitasi dan massa absorber yang digunakan untuk mereduksi getaran.
Validasi diperlukan untuk mengetahui perbandingan kesamaan trend line dari
hasil eksperimen dan simulasi. Dari hasil penelitian ditunjukkan bahwa sistem
dengan pemberian DVA mampu meredam getaran arah translasi dan arah rotasi
pada jarak sumber eksitasi 0,18 m Prosentase pengurangan maksimum di
frekuensi 12,9 Hz pada rasio lengan negatif rL = -1 yaitu sebesar 95,15 %.
Sedangkan untuk arah rotasi pengurangan getaran maksimum yaitu sebesar 55,56
%. Semakin besar jarak eksitasi maka inersia sistem semakin besar, sehingga
daerah penurunan getaran semakin lebar dan terjadi pada frekuensi yang lebih
tinggi.
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The used of DVA (dynamic vibration absorber) is to reduce the vibration
of translational and rotational vibration in excess of the natural frequency of the
system. In this study done by giving the effect of changing the position of the
excitation source and change the ratio of the moment arm of the center of gravity
of mass SDVA main system along the beam to the vibration characteristics of
translation and rotation. After the addition of DVA certainly increase the number
of degrees of freedom 2 to 3 DOF (degree of freedom). The main system modeled
mathematically and carried out simulations to determine the change in the
response characteristics of vibration that occurs. In the simulation given change
in the excitation arm SDVA distance to the center of mass of the primary system,
changes the moment arm distance, frequency excitation and mass absorber used to
reduce vibration. Validation is necessary to compare the similarity trendline from
the results of experiments and simulations. From the results of the study
demonstrated that the administration of the DVA system capable of reducing vibration direction of the translational and rotational direction of the excitation
source at a distance of 0.18 m. The maximum percentage reduction in the
frequency of 12.9 Hz at a ratio of the negative arm rL = -1 that is equal to
95.15%. As for the direction of rotation of the reduction of the maximum
vibration that is equal to 55.56%. The greater the distance of the excitation, the
inertia of the system grew, so the area is widening and decrease vibrations occur
at higher frequencies.
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | RTM 620.37 Roh p |
| Uncontrolled Keywords: | eksitasi, DVA, DOF, peredam getaran , rotasi, translasi |
| Subjects: | T Technology > TJ Mechanical engineering and machinery |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21101-(S2) Master Thesis |
| Depositing User: | Users 13 not found. |
| Date Deposited: | 06 Jul 2017 04:23 |
| Last Modified: | 27 Dec 2018 06:52 |
| URI: | http://repository.its.ac.id/id/eprint/41895 |
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