Pengembangan Translational Shaking Table (TST) dengan Penggerak Massa Unbalance yang Diletakkan Outplane terhadap Bidang Plat Shaking Table

Setyadi, Andri (2019) Pengembangan Translational Shaking Table (TST) dengan Penggerak Massa Unbalance yang Diletakkan Outplane terhadap Bidang Plat Shaking Table. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia memiliki potensi gempa bumi yang tinggi dikarenakan letak geografisnya yang dilalui tiga lempeng tektonik dunia yang terus bergerak yaitu Lempeng Indo-Australia, Lempeng Pasifik, dan Lempeng Eurasia. Gempa bumi yang terjadi di Indonesia kerap menyebabkan robohnya suatu bangunan sehingga menimbulkan korban jiwa. Mudah robohnya suatu bangunan bisa disebabkan karena struktur bangunan tersebut yang tidak bisa menahan beban dinamis dari goncangan gempa. Teknologi struktur bangunan tahan gempa bisa menjadi solusi daerah yang rawan terjadi gampa bumi. Pada tahap pengembangannya dibutuhkan alat yang dapat merepresentasikan goncangan gempa bumi yang akan diujikan pada rancangan model struktur sehingga diperoleh respon dinamis model struktur tersebut. Alat tersebut berupa meja getar atau sering disebut shaking table. Pada penelitian ini dilakukan pengujian dan pengembangan translational shaking table yang sebelumnya telah dilakukan oleh Wahyu Cahyo Utomo[12]. Pada penelitian ini akan dirancang suatu translational shaking table yang mana bidang massa unbalance diposisikan paralel terhadap bidang plat meja shaker untuk mengurangi efek gaya berat massa unbalance terhadap resultan gaya centrifugal oleh mekanisme eksentrik shaker. Shaking table ini akan digerakkan oleh gaya centrifugal akibat massa unbalance yang diputar oleh motor ac 0,25 Hp. Disc yang terpasang pada motor akan dikenai variasi jarak eksentrik sebesar 10cm, 12cm dan 15cm serta variasi massa unbalance sebesar 400gram, 800gram, dan 1200gram. Pada tahap pengambilan data digunakan probe accelerometer yang dihubungakan pada oscilloscope untuk menampilkan respon dinamis berupa percepatan dari shaking table. Hasil yang diperoleh dari penelitian ini yaitu alat translational shaking table dengan peningkatan nilai amplitudo maksimal sebesar 1,5cm dan range frekuensi 0,7 Hz sampai 11,7 Hz dengan percepatan maksimal 29,068m/s2, serta maksimal load sebasar 30 Kg. Dari hasil penelitian juga diperoleh kenaikan nilai percepatan dan perpindahan seiring meningkatnya massa unbalance. Seperti pada jarak eksentris 15 cm dan frekuensi 5 Hz dengan massa unbalance berturut-turut sebesar 400 gram, 800 gram, dan 1200 gram memiliki respon percepatan berturut-turut sebesar 4, 466 m/s2; 8,94 m/s2; dan 13.41 m/s2 dan memiliki respon perpindahan berturut-turut sebersar 0,0047m ; 0,0095m ; 0,0142m. Kenaikan nilai percepatan dan perpindahan juga diperoleh seiring meningkatnya nilai jarak eksentrik. Seperti pada massa unbalance sebesar 1200 gram dan frekuensi 5 Hz dengan jarak eksentris berturut-turut sebesar 10 cm, 12 cm, dan 15 cm memiliki respon percepatan sebesar 8,14 m/s2; 10,69 m/s2; 13,41 m/s2 dan memiliki respon perpindahan berturut-turut sebesar 0,0095m ; 0,01136m ; 0,0142m. ================================================================================================ Indonesia has a high potential for earthquakes due to its geographical location through three moving tectonic plates of the world, namely the Indo-Australian Plate, the Pacific Plate, and the Eurasian Plate. The earthquake that occurred in Indonesia often caused the collapse of a building causing casualties. The collapse of a building can be caused by the structure of the building that cannot withstand dynamic loads from earthquake shocks. The technology of earthquake resistant building structures can be a solution for areas with high potential for earthquakes. In the development that technology a tool is needed that can represent earthquake shocks that will be tested on the structural model design to obtain a dynamic response to the structure model. The tool is a vibrating table or often called a shaking table. In this study development of the translational shaking table was carried out by Wahyu Cahyo Utomo[12]. In this study a translational shaking table will be designed in which the unbalanced mass field is laid out against the shaker table plate plane to reduce the effect of mass gravity unbalance to the resultant centrifugal force by the eccentric shaker mechanism. This shaking table will be driven by a centrifugal force due to the unbalance mass rotated by the 0,25 hp ac motor. Disc installed on the motor will be subjected to eccentric distance variations of 10cm, 12cm and 15cm and unbalance mass variations of 400gram, 800gram, and 1200gram. In the data collection stage, an accelerometer probe is used which is connected to the oscilloscope to display a dynamic response in the form of acceleration from the shaking table. Retrieval of displacement response data is used the proximity sensor "VL53L0X" which is connected to the Arduino Uno board. The results obtained from this study are translational shaking table with an increase in the maximum amplitude value of 1,5 cm and a frequency range of 0,7 Hz to 11,7 Hz with a maximum acceleration of 29,068m/s2, and a maximum load of 30 Kg. From the results of the study also obtained an increase in the value of acceleration and displacement with increasing unbalance mass. Such as at an eccentric distance of 15 cm and a frequency of 5 Hz with a mass of unbalance of 400 gram, 800 gram, and 1200 gram having a successive acceleration response of 4,466 m/s2 ; 8,94 m/s2 ; and 13,41 m/s2 and has a consecutive displacement response of 0,0047m ; 0,0095m ; 0,0142m. The increase in acceleration and displacement values is also obtained as the eccentric distance value increases. As for the unbalance mass of 1200 gram and the frequency of 5 Hz with an eccentric distance of 10 cm, 12 cm, and 15 cm respectively has an acceleration response of 8,14 m/s2 ; 10,69 m/s2 ; 13,41 m/s2 and has a consecutive displacement response of 0,0095m ; 0,01136m ; 0,0142m.

Item Type: Thesis (Undergraduate)
Additional Information: RSM 620.112 48 Set p-1 2019
Uncontrolled Keywords: Shaking table, rotating mass unbalance, jarak eksentrik, massa unbalance
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: Andri Setyadi
Date Deposited: 18 Jan 2022 07:29
Last Modified: 18 Jan 2022 08:38
URI: https://repository.its.ac.id/id/eprint/61971

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