Analisis Pengaruh Variasi Ketebalan Rubber Mount Dan Frekuensi Kerja Terhadap Respon Dinamis Benda Uji Pada Dual-axis Translational Shaking Table

Satriawan, Hafidh Naufaldi (2021) Analisis Pengaruh Variasi Ketebalan Rubber Mount Dan Frekuensi Kerja Terhadap Respon Dinamis Benda Uji Pada Dual-axis Translational Shaking Table. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Passive vibration and noise reduction merupakan metode yang sangat mudah dan murah untuk mengurangi getaran dan noise pada suatu sistem. Metode tersebut digunakan dengan menambahkan isolator getaran di antara alas dan sistem yang bergetar. Rubber mount merupakan isolator getaran yang umum digunakan untuk mengurangi getaran yang ditimbulkan akibat suatu sistem seperti pompa maupun motor. Saat ini bentuk dan dimensi dari rubber mount sangat beragam. Bentuk maupun dimensi dari rubber mount akan mempengaruhi stiffness dari rubber mount tersebut. Sehingga perlu dilakukan pengujian mengenai karakteristik respon dinamis pada benda uji akibat pemberian rubber mount.
Pada penelitian ini dilakukan dengan mengambil data secara simulasi dan secara eksperimen dengan benda uji berbentuk balok (4 kg). Variasi yang dilakukan pada penelitian ini yaitu ketebalan dari rubber mount diameter 30 mm, frekuensi kerja 7-15 Hz, massa unbalance sebesar 400 gram, 800 gram, dan 1200 gram, serta posisi sensor percepatan dari meja Dual-axis Translational Shaking Table (DTST) pada getaran arah vertikal dan simultan. Simulasi dilakukan dengan menjalankan persamaan state variable yang telah ditemukan dengan memasukkan nilai parameter yang ada. Simulasi yang digunakan menggunakan software MATLAB Simulink sehingga didapatkan bode diagram frekuensi natural dan respon dinamis percepatan. Pada proses pengambilan data eksperimen dilakukan dengan menyusun alat-alat penunjang pegambilan data. Sensor percepatan dipasang pada benda uji dan meja DTST untuk mengukur percepatan pada benda uji dan meja DTST yang bergerak.
Hasil dari tugas akhir ini berupa respon dinamis percepatan terhadap frekuensi dari benda uji maupun meja DTST untuk setiap variasi rubber mount yang digunakan dan juga menggunakan rentang frekuensi kerja yang digunakan sebesar 7-15 Hz. Didapatkan hasil semakin tebal rubber mount yang digunakan, maka respon dinamis percepatan benda uji yang dihasilkan akan lebih kecil sedangakan respon percepatan meja DTST akan meningkat. Peningkatan frekuensi kerja akan meningkatkan respon dinamis dari benda uji dan meja DTST. Frekuensi yang semakin tinggi cenderung memiliki respon dinamis percepatan benda uji yang semakin tinggi untuk setiap variasi rubber mount, dan untuk respon percepatan dinamis meja DTST semakin tinggi. Variasi massa unbalance mempengaruhi respon percepatan benda uji dan meja DTST. Semakin besar massa unbalance maka respon dinamsi memiliki nilai semakin tinggi. Posisi probe accelerometer yang diletakkan di meja DTST juga mempengaruhi respon dinamis meja DTST. Semakin menjauhi titik tengah meja DTST, respon dinamis percepatan akan memiliki nilai error yang besar dibandingkan hasil simulasi.
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Passive vibration and noise reduction is very easy and inexpensive method to reduce viibration and noise in a system. The method is used by adding vibration insulator between base and the vibrating system. Rubber mount is vibration insulator commonly used to reduce vibration caused by system like pumps and motors. Currently the shapes and dimensions of rubber mount are very diverse. The shapes and dimensions of rubber mount will affect the stiffness of rubber mount. So it necessary to test the characteristics of dynamic response in test object due to rubber mounting.
In this study was conducted by taking data from simulation and experiment with block-shaped test object (4 kg). The variation in this study were the thickness of the rubber mount with a diameter 30 mm, working frequency 7-15 Hz, and unbalance mass of 400 gram, 800 gram and 1200 gram, and the position of the probe accelerometer on the Dual-axis Translational Shaking Table (DTST) on vertical and simultaneous directional vibration. The simulation is done by running the state variable that has been found by entering existing parameter values. The simulation is done by MATLAB Simulink software to obtain bode diagram of natural frequencies and acceleration dynamic responses. The experimental result is done by assembling DTST with supporting tools for data retrieval. The probe accelerometer is mounted on the test object and the DTST table to measure the acceleration of the test object and DTST table. The output of the experimental results is a graph of potential difference in the oscilloscope which is then processed into acceleration against time.
The result of this final project is acceleration dynamic response against frequency from test object and DTST table for each thickness variation of rubber mount used and also uses the working frequency 7-15 Hz. The results show that the thicker the rubber mount is used, the smaller dynamic response of the acceleration of the test object, while the acceleration response from DTST table will increase. Increasing the working frequency will increase the dynamic response of the test object and DTST table. The higher frequency, the higher dynamic response of the DTST table for each thickness variation of rubber mount, while the dynamic response of the test object did not change much and tends to be constant. The unbalance mass variation affects the acceleration response of test object and DTST table. The greater unbalance mass used, the higher value of dynamic response. The position of probe accelerometer that mounted on DTST table affects the dynamic response of DTST table. The further away from the center point of DTST table, the acceleration dynamic response will have larger error value compared to the simulation results.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	2 DOF, Frekuensi Natural, Rubber Mount, Meja Getar, 2 degree of freedom, natural frequency, rubber mount, vibration exciter
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA355 Vibration. T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Hafidh Naufaldi Satriawan
Date Deposited:	11 Mar 2021 02:37
Last Modified:	11 Mar 2021 02:37
URI:	http://repository.its.ac.id/id/eprint/84080

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