Hidayatullah, Firas Rahmad (2018) Analisa Reduksi Getaran Dari Mekanisme Elektromagnetic Vibration Absorber (EMVA) Sebagai Peredam Getaran Dan Penghasil Listrik. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Getaran yang terjadi di sekeliling kita bervariasi sesuai konstruksi bangun mesin itu sendiri. Terdapat getaran dengan arah translasi atau rotasi. Getaran ini jika dibiarkan terus-menerus pada suatu mesin dapat mengakibatkan kerusakan pada konstruksi mesin seperti retak, keausan, fatigue, bahkan dapat mengalami patah apabila frekuensi operasi sama atau mendekati nilai frekuensi natural. Pada akhirnya efisiensi mesin berkurang. Adapun penelitian yang berkaitan dengan reduksi getaran dan penyerapan energi dari getaran salah satunya telah dilakukan oleh Faiz Imawan Dana Putra[1] tentang rancang bangun dan simulasi dari mekanisme cantilever piezoelectric vibration absorber (CPVA). Namun energi yang diserap bernilai sangat kecil yakni 0.000054 watt. Sehingga perlu alternatif lain. Electromagnetic Vibration Absorber (EMVA) merupakan alternatif yang sangat direkomendasikan. Menggunakan diameter kawat 0,35 mm dan jumlah lilitan kumparan 4000 lilitan memberikan penghematan bahan bakar sekitar 30,79% dibandingkan dengan mesin diesel standar[10]. EMVA akan mereduksi getaran dan menyerap energi menggunakan konsep induksi electromagnetik yang mana seperti kita ketahui konsep induksi electromagnetic lebih baik dalam penyerapan energi kinetik dibanding piezoelectric.
Pada penelitian tugas akhir ini, dilakukan analisa dan perancangan mekanisme peredam getaran sekaligus energy harvester dengan konsep induksi elektromagnetik yang mana perangkat ini disebut Electromagnetic Vibration Absorber (EMVA). Sistem utama yang akan dianalisa berupa plat datar yang ditumpu oleh empat buah pegas. Sistem utama pada penelitian ini diberi gaya eksitasi oleh motor yang didistribusikan dengan massa eksentrik dan pegas. Gaya eksitasi yang berlebih diteruskan ke massa absorber dan dimanfaatkan oleh sistem electrical electromagnetic untuk menghasilkan energi listrik. Penelitian ini hanya menganalisa reduksi getaran pada arah translasi, rolling, dan pitching. Arah translasi hanya sebatas pergerakan sumbu vertikal. Rolling dan pitching disebabkan perbedaan nilai konstanta pegas pada setiap pegas. Variasi frekuensi operasi pada penelitian ini mengikuti frekuensi natural pada sistem utama. Variasi lokasi EMVA hanya terbatas 2 dimensi koordinat yang mana disesuaikan dengan lokasi getaran sistem utama yang paling besar. Adapun variasi lainnya yaitu amplitudo eksitasi sebesar 0,02 m, 0,03 m, dan 0,04 m sebagai inputan getaran..
Hasil dari penelitian ini adalah rancang bangun beserta rekomendasi parameter EMVA terdiri dari massa, konstanta pegas, nilai medan magnet dan dimensi EMVA yang mana memiliki fungsi sebagai pereduksi getaran dan pengubah energi kinetik menjadi energi listrik. Sehingga, dapat diketahui energi bangkitan dan reduksi getaran dari mekanisme EMVA serta pengaruhnya terhadap letak dan amplitudo eksitasi.
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The vibrations that occur around us vary according to the construction of the machine itself. There is a vibration with the direction of translation or rotation. This vibration if left continuously on a machine can result in damage to engine construction such as cracking, wear and fatigue and even breaking if the operating frequency is equal or close to the natural frequency value. In the end the engine efficiency is reduced. The research related to vibration reduction and energy absorption from one of the vibrations has been done by Faiz Imawan Dana Putra [1] about the design and simulation of cantilever piezoelectric vibration absorber (CPVA) mechanism. But the energy absorbed by CPVA is very small 0.000054 watts. So it needs another alternative in absorbing energy. Electromagnetic Vibration Absorber (EMVA) is a recommended alternative. EMVA reduces vibration and absorbs energy using the concept of electromagnetic induction. Using a 0.35 mm wire diameter and coil winding amount of 4000 windings alone provides 30.79% fuel savings compared to standard diesel engines [10]. So it can be seen that the concept of electromagnetic induction is better in the absorption of kinetic energy than piezoelectric.
In this final project, analyzing and designing dynamic vibration mechanism of adsorber and energy harvester with electromagnetic induction concept which is called Electromagnetic Vibration Absorber (EMVA). The main system to be analyzed is a flat plate supported by four springs. The main system in this study was given an excitation force by a motor that was distributed with eccentric mass and springs into vibrations. The vibrations in the main system are absorbed by the absorber mass and utilized by EMVA into electrical energy. This study only analyzes vibration reduction in translational, rolling, and pitching directions. The direction of translation is limited to the movement of the vertical axis. The direction of rolling and pitching is due to the difference in stiffness constant value on each spring. Operation frequency variation in this study used range 1 rad / s up to 100 rad / s. The variation of the EMVA point of contact is only limited to 2 dimensional coordinates which is adjusted to the largest main system vibration location. The other variation is the excitation amplitude of 0.02 m, 0.03 m, and 0.04 m as the vibration input.
The results obtained from this research are the point of placing EMVA on the main system which has the largest vibration reduction. The largest vibration reduction occurred at number six with a vibration reduction rician of 64% translational direction (10.6763 m / s2 to 3.8837 m / s2), -175% rolling direction (4.9433 rad / s2 to 13,5702 rad / s2), and 20% pitching direction 25.3822 rad / s2 to 20.1988 rad / s2). In addition, the highest anergy harvesting in number three with a voltage of 7.5452 volt and power generation 8.9232 watts
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 621.811 Hid a-1 3100018076723 |
| Uncontrolled Keywords: | Vibration, Electric Energy, Elektromagnetic, Frequency, Amplitudo, Location of EMVA |
| Subjects: | Q Science > QA Mathematics > QA935 Vibration T Technology > TJ Mechanical engineering and machinery > TJ219 Pneumatic control systems T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Firas Rahmad Hidayatullah |
| Date Deposited: | 18 Feb 2019 02:55 |
| Last Modified: | 27 Jan 2021 06:27 |
| URI: | http://repository.its.ac.id/id/eprint/58005 |
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