It is necessary to have an LAPAN-TUBSAT (Lembaga Penerbangan dan Antariksa Nasional/ National Institute of Aeronautics and Space) (Technische University of Berlin Satellite) satellite data receiving system that is low cost and can be placed in various parts of Indonesia. This system will later spear head the data receiver and this meets all areas detected by the earth surveillance method in real time and can be recorded at the Earth Station. By using a helical antenna that is engineered independently with the rules of the S band at 2.22 GHz, it will be able to control the Indonesian region. The construction of this receiving antenna uses a helical antenna, a receiver antenna system that combines helix asa feed horn on a parabolic antenna is designed to be able to work at a center frequency of 2,220 MHz, a bandwidth of 27 MHz, LHCP polarization, and a minimum gain of 10 dB. With a Parabolic shaped reflection antenna with Prime Focus. With motor antenna is a full motion antenna with a perstep movement of 0.25 degrees on Azimuth and elevation. The Design will be acquisition the data from satellite, and with the helical antenna. The Helical that by requirement of the 2,22 GHz design. With the LHCP (Left Hand Circular Polarization) and with the a bandwidth of 27 MHz. for the antenna parabola as a catcher of signal from satellite we use type of Primefocus wichis the point focal in the central face of parabola and we will put feed Horn that include inside is the Helical feed antenna. Antenna have a spesification Movement is 0,25 degrees per second With the successful engineering of the development of Helical antenna, it can also later apply it to various other satellites with adjustments to the dimensions of the antenna only and the receiving system.
Efforts to develop the defense industry are to encourage innovation, because only with innovation can an industry always develop competence in the form of technology development and commercialization. The innovation process includes research and development, prototyping, demonstration, commercialization and after-sales service. Innovation is a combination of invention and commercialization of technology. So that innovation requires a process from the background of the needs to the achievement of success during commercialization. Currently, Indonesia has one type of medium tank technology called the Harimau. Basically, Indonesia has implemented technological innovation in the development of the medium tank technology 'Harimau'. Howeever, there are still challenges in the way of implementing these technological advancements, including whether or not their aplication may lead to defense industry independence or vice versa. This paper aims to analyze the national defense industry on the technological innovation of the medium tank 'Harimau'. The SWOT (Stengths, Weaknesses, Opportunities, and Threats) method is used in this analysis. This research is planned to give an analysis of defense industry technology developments that will advance the provision of defense and defense equipment to land-bases forces.
Tabung motor roket merupakan komponen utama pada roket Dextrose. Makalah ini bertujuan untuk menyelidiki pengaruh panjang tabung dan radius fillet terhadap faktor keamanan tabung motor roket dextrose menggunakan Ansys Workbench. Tabung roket Dextrose menggunakan material Al 6063-T5 dengan diameter luar 32 mm, ketebalan dinding 3 mm, dan tekanan internal 5 MPa. Panjang tabung roket divariasikan 200, 250, 300, dan 350 mm. Radius fillet menggunakan variasi 3, 4, dan 5 mm. Analisis dilakukan menggunakan metode elemen hingga dengan bantuan Ansys Workbench. Hasil simulasi menunjukkan bahwa faktor keamanan tidak berpengaruh signifikan terhadap perubahan panjang tabung roket. Faktor keamanan meningkat seiring peningkatan radius fillet.
Salah satu komponen penting pada roket Dextrose adalah tabung motor roket. Penelitian ini bertujuan untuk merancang tabung motor roket Dextrose yang mampu menahan tekanan internal 5 MPa. Pada penelitian ini, desain tabung roket Dextrose menggunakan silinder berdinding tebal dengan diameter luar 32 mm, radius fillet 2 mm, dan panjang 200 mm. Variasi ketebalan dinding yang digunakan yaitu 2 mm, 2.5 mm, dan 3 mm. Tekanan internal divariasikan mulai dari 1, 2, 3, 4, dan 5 MPa. Material yang digunakan dalam penelitian yaitu Aluminium 6063-T5. Analisis tegangan statik dilakukan dengan bantuan perangkat lunak Ansys Workbench. Hasil simulasi Ansys menunjukkan bahwa tabung motor roket dengan ketebalan 3 mm mampu menahan tekanan internal hingga 5 MPa karena memiliki faktor keamanan lebih dari 2, yaitu 2.58. Perbandingan nilai tegangan Longitudinal dan Hoop maksimum antara simulasi Ansys Workbench dan perhitungan analitik digunakan untuk validasi hasil penelitian. Persentase kesalahan antara simulasi Ansys Workbench dan perhitungan analitik kurang dari 0.5 persen.
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