Studi Analisis Karakteristik Dinamik Pipa Berdinding Tipis Akibat Chatter Pada Mesin Bubut

Yamani, Reyhan (2026) Studi Analisis Karakteristik Dinamik Pipa Berdinding Tipis Akibat Chatter Pada Mesin Bubut. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Getaran yang ditimbulkan dari proses permesinan merupakan salah satu hal yang dapat mempengaruhi hasil kualitas permukaan dan juga dapat memperpendek umur pahat mesin itu sendiri. Salah satu fenomena getaran yang ingin dihindari adalah chatter, yaitu getaran berkelanjutan yang terjadi akibat dari resonansi antara gaya pemotongan dan karakteristik dinamik benda kerja. Maka dari itu, penelitian ini bertujuan untuk mempelajari karakteristik dinamik pipa berdinding tipis dengan dimensi yang bervariasi, melalui adanya potensi chatter. Metode penelitian dilakukan melalui dua pendekatan, yaitu simulasi dan eksperimen. Simulasi dilakukan menggunakan perangkat lunak ANSYS dengan metode utamanya modal analysis untuk menentukan frekuensi natural dan mode shape-nya. Setelah itu dilakukan analisis getaran untuk menemukan frekuensi dari spesimen ketika chatter, kemudian dibandingkan dengan hasil simulasi sesuai dengan mode shape-nya. Sedangkan untuk eksperimen, dilakukan menggunakan impact hammer test untuk memperoleh data frekuensi natural yang aktual. Hasil penelitian menunjukan bahwa frekuensi natural hasil simulasi memiliki kesesuaian yang baik dengan hasil eksperimen, dengan selisih errornya sebesar 58,12771 Hz. Sehingga model simulasi dapat dikatakan berhasil merepresentasikan kondisi nyatanya. Kemudian variasi dimensi pipa hasil simulasi menunjukan kesamaan dengan teori umumnya. Namun, terdapat beberapa perbedaan yang dikarenakan, selain adanya pengaruh dari nilai kekakuan, tetapi juga nilai massa. Lalu, perilaku getaran benda kerja dengan panjang 150 mm dan ketebalan 6 mm mengalami chatter akibat dari ovalisasi spesimen. Hal ini membuktikan bahwa perilaku getaran dapat dibuktikan melalui pola chatter mark-nya dan mode shape simulasi. Temuan ini diharapkan dapat menjadi dasar pengembangan lebih lanjut dalam pengendalian getaran pada benda kerja pipa berdinding tipis, serta peningkatan kualitas permukaan hasil permesinan.
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Vibrations generated during machining processes are among the factors that can affect surface quality and shorten the tool’s lifespan. One vibration phenomenon that must be avoided is chatter, which is a self-excited vibration occurring due to resonance between cutting forces and the dynamic characteristics of the workpiece. Therefore, this study aims to investigate the dynamic characteristics of thin-walled cylindrical tubes with varying dimensions by analyzing their potential for chatter. The research was conducted using two approaches: simulation and experimentation. The simulation was performed using ANSYS software with a modal analysis method to determine the natural frequencies and corresponding mode shapes. Subsequently, vibration analysis was conducted to identify the frequency of the specimen during chatter, which was then compared with the simulation results according to its mode shape. Meanwhile, the experimental test was carried out using an impact hammer test to obtain the actual natural frequency data. The results show that the natural frequencies obtained from the simulation are in good agreement with the experimental results, with an error difference of 58,12771 Hz. Therefore, the simulation model can be considered capable of accurately represent the actual condition. Furthermore, the dimensional variations of the pipe show similarities with the general theory. However, some show difference, which are attributed, not only to the influence of stiffness, but also to the mass. In addition, the vibration behavior of the workpiece with a length of 150 mm and a thickness of 6 mm experienced chatter due to specimen ovalization. This indicates that the vibration behavior can be identified through the chatter marks and the simulated mode shapes. These findings are expected to serve as a foundation for further research in vibration control of thin-walled workpieces and the improvement of surface quality in machining processes.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	ANSYS, Chatter, Frekuensi Natural, Mode Shape, Surface Finish,
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TS Manufactures > TS183 Manufacturing processes. Lean manufacturing.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Reyhan Arya Yamani
Date Deposited:	02 Feb 2026 03:57
Last Modified:	02 Feb 2026 03:57
URI:	http://repository.its.ac.id/id/eprint/131524

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