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Triharjanto, Robertus Heru
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering

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DESAIN DAN PENGUJIAN STRUKTUR SATELIT MIKRO LAPAN-TUBSAT Triharjanto, Robertus Heru
Indonesian Journal of Aerospace Vol. 4 No. 2 (2006): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

The paper discuss about the design and test of the structure of LAPAN-TUBSAT micro-satellite, which is the task done by the writer during his time as the member of LAPAN-TUBSAT integration and test. The discussion includes the design requirment for the structure as mechanical interface and its implementation as well as its design validataion process via test as accordance to the requirement set by the launcher authority.
KARAKTERISTIK DINAMIKA STRUKTUR SATELIT MIKRO LAPAN-TUBSAT Triharjanto, Robertus Heru; Sugiarmadji HPS
Indonesian Journal of Aerospace Vol. 3 No. 2 (2005): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2005.v3.a814

Abstract

The TUBSAT-LAPAN micro satellite is planned to be launched using PSLV rocket. The design constraints of the mechanical system of the satellite are able to accomodate structural requirment for PSLV, which are first resonance frequency in the rocket longitudinal axis 90 Hz and first resonance frequency in the lateral axis 45 Hz. Therefore, the structural dynamic characteristic data of the satellite is important to be evaluated, such as natural frequency and mode shapes of the satellite structures, The normal modes analysis made is done usingh Finite Element Methods commercial software NASTRAN. To simplify the FEM modeling the satellite components inside the compartmens is replaced by a dummy load simulating their contribution to satellite mass, centerof gravity and inertia, which was made by the same material as the satellite's structure, i.e. Al-Alloy 2024T351. Meanwhile, the FEM modeling for both the UHF antena used the Stainless Steel materials as the real antena. The analysis results show that the lowest local natural frequency of the satellite occurs on the UHF antena. The first natural frequency of the antena structures in lateral direction is 52,29 Hz. The first natural frequency of the satellite in lateral direction 151.47 Hz completing the satellite integration, vibration test was done to the satellite. The test shows that the first global frequency is 72-75 Hz in the lateral direction and 148 Hz in longitudinal direction. Structural dynamic characteristic of TUBSAT_LAPAN micro satellite in free flying condition are also analyzed using no-constraint condition to check the safe separation clearance scenario. The results show that the first natural frequencies for satellite structures (combination) become very small, less than 0.00032 Hz. But, the lowest of the first natural frequency for UHF antena structures is almost constant, 52.30 Hz in lateral direction.
PENGUKURAN KARAKTERISTIK DINAMIKA STRUKTUR SATELIT LAPAN-ORARI/A2 (STRUCTURAL DYNAMICS CHARACTERITICS MEASUREMENT OF LAPAN-ORARI/A2 SATELLITE) Huzain, Mohammad Farid; Triharjanto, Robertus Heru
Indonesian Journal of Aerospace Vol. 11 No. 2 Desember (2013): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Satelit LAPAN-ORARI/A2 merupakan satelit generasi kedua setelah satelit LAPAN-A1 (atau lebih dikenal dengan LAPAN-TUBSAT). Satelit LAPAN-ORARI/A2 ini adalah satelit mikro pertama yang dirancang, dibangun, dan diuji di Indonesia. Makalah ini membahas mengenai pengujian struktur satelit mikro LAPAN-ORARI/A2, dalam hal ini pengujian getar untuk mencari frekuensi natural pertama satelit pada tiap sumbu. Pengujian getar sangat perlu dilakukan untuk memastikan bahwa satelit mampu menerima beban sebagai akibat dari sistem aerodinamik dan propulsi dari wahana peluncur (roket). Pengujian getar merupakan salah satu syarat yang harus dilalui sebelum satelit diluncurkan. Beban pengujian ini mengikuti beban yang dipersyaratkan oleh otoritas peluncur satelit, dalam hal ini ISRO-INDIA, yaitu dengan frekuensi resonansi di atas 45 Hz untuk arah lateral dan di atas 90 Hz untuk arah longitudinal. Hasil pengujian getar satelit LAPAN-ORARI/A2 menunjukkan frekuensi natural pertama arah lateral terjadi pada sumbu-Z pada 97 Hz dan pada sumbu-X pada 73 Hz, sedangkan pada arah longitudinal terjadi pada 162 Hz (sumbu Y/vertikal satelit). Dari hasil pengujian tersebut menunjukkan bahwa satelit LAPAN-ORARI/A2 mampu menerima beban sesuai dengan yang dipersyaratkan oleh pihak peluncur.
ANALISIS MANUVER PENYELAMATAN SATELIT PALAPA - D Triharjanto, Robertus Heru; Hutasulut, Hagorly M
Indonesian Journal of Aerospace Vol. 8 No. 2 Desember (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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The paper discusses the analysis on orbit maneuver done to rescue PALAPA-D satellite stranded in high elliptical orbit during its launch in 2009. The purpose of the research is as an exercise for LAPAN and ITB on designing orbit maneuver, especially in the rescue of satellite stranded while approaching its GTO during its launch. The study will gain knowledge on the key factors that make the rescue effort successful. The simulation is done using orbit analysis software STK. Meanwhile, the LM-3 launcher and Spacebus-4000 satellite bus data is taken from internet publication. The result on the life of the satellite is only difference by 1,9% from the one calculated by the satellite manufacturers, Thales Alenia. Therefore, it can be concluded that the analysis has good validity.
ANALISIS TEGANGAN PADA TABUNG KOMPOSIT SERAT KARBON UNTUK MOTOR ROKET BERDIAMETER 200 MM DENGAN METODE SINGLE LAYER LAMINATED ELEMENT Putra, Ronald Gunawan; Triharjanto, Robertus Heru
Indonesian Journal of Aerospace Vol. 8 No. 2 Desember (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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This research analizes rocket RWX 200 motor tube using carbon fiber reinforced for 6 mm thickness in order to optimize the weight. Carbon fiber is chosen due to its mechanical properties such as high strength and stiffness, and high temperature resistance, as the specification needs of the rocket motor tube. Rocket motor tube is manufactured by using weaving method, while the analysis and simulation is calculated by assuming it as laminate with the [0/90]s stacking sequence. From the calculation and simulation, it is determined that the X stress component of the laminates is below the strength of the material, while the Y stress component is beyond the strength of the material. It can be concluded that 900 laminae in each laminates has been failed.
ALGORITMA PENGENALAN POLA BINTANG UNTUK DETEKSI POSISI BINTANG PADA STAR SENSOR SATELIT LAPAN Saifudin, M. Arif; Triharjanto, Robertus Heru
Indonesian Journal of Aerospace Vol. 8 No. 1 Juni (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Star sensor is a high accuracy sensor for a satellite attitude determination. This sensor identifies the position of stars in celestial map by comparing the position of stars on its active sensor with the star position data contained in its catalogue. An algorithm is needed to recognize the star pattern imaged by sensoring and calculating the position of the stars. An efficient and accurate algorithm is needed to improve the performance of the star sensor for satellite attitude determination. A simple star pattern recognition algorithm uses the neighbourhood technique. The first approach of algorithm is detecting the brightest star and its neigbours in the sensor Field of View (FOV) and identifying whether the stars in image sensor are fit to the star pattern in the catalogue.The simple catalogue used contains the star position and all its neighbouring stars within particular distance in the scope of FOV. Test result showed that neighbours technique has an accuracy below 1 arc min which correspond to the typical accuracy value of star sensor.
Co-Authors Ali Muksin, Ali Bahri, Sayr Bura, Romie O. Dwiastuty, Fuji Emir Mauludi Husni, Emir Mauludi Faturrohim, Luqman Hari Muhammad Hutasulut, Hagorly M Huzain, Mohammad Farid Lidia Kristina Panjaitan, Lidia Kristina Muslimin, Ahmad Novi Nugroho, Widianto Poetro, Ridanto Eko Pujo Widodo, Pujo Putra, Ronald Gunawan R. S., Muhammad Riksa Andanawari Riyadl, Ahmad Rudi Setiawan Saifudin, M. Arif Sugiarmadji HPS Supriyanto Supriyanto Wawan Hermawan Y. H. Yogaswara, Y. H.