Mechatronics, Electrical Power, and Vehicular Technology 03 (2012) 111-116 Mechatronics, Electrical Power, and Vehicular Technology e-ISSN: 2088-6985 p-ISSN: 2087-3379 Accreditation Number: 432/Akred-LIPI/P2MI-LIPI/04/2012 www.mevjournal.com © 2012 RCEPM - LIPI All rights reserved doi: 10.14203/j.mev.2012.v3.111-116 VIBRATION DISTURBANCE DAMPING SYSTEM DESIGN TO PROTECT PAYLOAD OF THE ROCKET PERANCANGAN SISTEM PEREDAM GANGGUAN GETARAN UNTUK MELINDUNGI BEBAN-GUNA ROKET Sutisno a, *, Andreas Prasetya Adi a a Bidang Kendali dan Telemetri, Pusat Teknologi Roket, LAPAN Jl. Mekarsari 2, Rumpin, Bogor 16350 Received 30 Sept 2012; Received in revised form 1 December 2012; Accepted 04 December 2012 Published online 18 December 2012 Abstract Rocket motor generates vibrations acting on whole rocket body including its contents. Part of the body which is sensitive to disturbance is the rocket payload. The payload consists of various electronic instruments including: transmitter, various sensors, accelerometer, gyro, the embedded controller system, and others. This paper presents research on rocket vibration influence to the payload and the method to avoid disturbance. Avoiding influence of vibration disturbance can be done using silicone gel material whose typical damping factors are relatively high. The rocket vibration was simulated using electromagnetic motor, and the vibrations were measured using an accelerometer sensor. The measurement results were displayed in the form of curve, indicating the vibration level on some parts of the tested material. Some measurement results can be applied to determine the good material to attenuate vibration disturbance on the instruments of the payload. Key words: motor, rocket, vibration, payload, silicone. Abstrak Motor roket dapat menimbulkan getaran yang menggetarkan roket beserta isinya. Bagian yang rentan mengalami gangguan adalah beban-guna roket. Beban-guna ini terdiri dari berbagai peralatan elektronik seperti: transmitter, macam-macam sensor, akselerometer, gyro, embedded controller system, dan lain sebagainya. Pada makalah ini disajikan penelitian pengaruh getaran motor roket terhadap beban-guna dan cara mengatasi gangguan tersebut. Untuk mengatasi pengaruh gangguan getaran dapat dilakukan dengan menggunakan bahan silicone gel. Silicone gel dipilih sebagai bahan isolator karena memiliki faktor redaman spesifik yang relatif tinggi dibandingkan dengan beberapa bahan lain. Getaran motor roket disimulasikan menggunakan motor listrik dan diukur menggunakan sensor akselerometer. Hasil pengukuran ditampilkan dalam bentuk kurva, yang menunjukkan level getaran pada beberapa bagian benda uji. Hasil dari beberapa percobaan dapat digunakan untuk menentukan bahan peredam yang baik untuk mengurangi getaran yang mengganggu instrumen pada beban-guna. Kata kunci: motor, roket, getaran, beban-guna, silicone gel. I. INTRODUCTION An important part in rocket is the electronic payload named embedded control system which consists of microprocessor, sensors, analog and digital circuits, transceiver radio, circuit wiring and power supply. The entire parts of the payload must be protected from disturbances occurring mainly at the time of launching. The most influencing disturbances are held along propellant burning time, as shown in Figure 1. Most of the time, very significant shocks and vibrations occurred due to the rocket motor firing. Frequently, problem occurs at the launching, causing the electronic parts of the payload not to function suddenly while the motor is still firing. These problems happen frequently in launching of a big type rocket such as RX-250, RX-320 and RX- 420 [11]. To resolve the problem it is necessary to have an absorption system to reduce vibration and shock disturbances. The absorption system can be used to protect the embedded system from various shocks, vibrations and acceleration forces, not only during burning time but also along the * Corresponding Author. Tel: +62-21-49006215; +62-81389829416 E-mail: rusa9@yahoo.com