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All Journal Jurnal Teknologi Dirgantara
Ahmad Jamaludin Fitroh
Pusat Teknologi Dirgantara Terapan
Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Mechanical Engineering Physics

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SIMULASI DAN PERHITUNGAN SPIN ROKET FOLDED FIN BERDIAMETER 200 mm Ahmad Jamaludin Fitroh; - Saeri
Jurnal Teknologi Dirgantara Vol. 8 No.1 Juni 2010
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

One of rocket movement types is spin maneuver. The rocket rotation towards the axisymmetric axis is needed so the rocket can move straight in it’s flight line. The object of spin simulation and calculation in this work is the Rocket of LAPAN with the diameter of 200 mm. The simulation and calculation were done for 0.6, 1.0, 2.0, and 3.0 Mach of flight speed. The simulation and calculation results show that spin and drag of fin will increase while the flight speed is increasing. The spin and drag of fin for 3.0 Mach of flight speed are 36 rps and 16.6 kg respectively
RANCANGAN DAN ANALISIS AERODINAMIKA SUDU TURBIN ANGIN KAPASITAS 300 KW Sulistyo Atmadi; Ahmad Jamaludin Fitroh
Jurnal Teknologi Dirgantara Vol 6, No.2 Desember (2008)
Publisher : National Institute of Aeronautics and Space - LAPAN

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Penelitian ini merupakan bagian dari kegiatan Perancangan SKEA 300 kW. Rotor dirancang dengan diameter 45 m dengan jumlah sudu tiga buah. Penampang sudu berbentuk airfoil NACA 4424, 4418, dan 4412 berurutan dari pangkal hingga ujung. Prestasi airfoil dihitung dengan simulasi secara CFD dengan mempertimbangkan efek bilangan Reynolds dan bilangan Mach. Geometri sudu mempunyai puntiran sebesar 15º. Dengan memperhitungkan rugi-rugi antara rotor dan generator, maka sudu akan mampu menghasilkan 350 kW pada kecepatan angin nominal 10 m/det dengan sudut pasang sudu sebesar 2º pada putaran 35 rpm dan tip speed ratio λ = 8,24.
PENGEMBANGAN METODE PENENTUAN KARAKTERISTIK RANCANGAN AWAL ROTOR TURBIN ANGIN Sulistyo Atmadi; Ahmad Jamaludin Fitroh
Jurnal Teknologi Dirgantara Vol 5, No.1 Juni (2007)
Publisher : National Institute of Aeronautics and Space - LAPAN

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A method for determining design characteristics of a wind turbine rotor has been developed. Given the desired power and operational wind speed, the approximate design diameter and rotor rpm can then be determined. The size of the rotor diameter is governed by the blade performance, in which is normally given as power coefficient Cp; designed rotor spedd can be known after calculating the tip spedd ratio. Using this method, the blade and rotor characteristics can be designed quickly as a preliminary design parameter. Keywords: Rancangan awal, Koefisien daya, Tip speed ratio.
ANALISA PENGARUH SUDUT PITCH, UNTUK MEMPEROLEH DAYA OPTIMAL TURBIN ANGIN LPN-SKEA 50 KW PADA BEBERAPA KONDISI KECEPATAN ANGIN Sulistyo Atmadi; Ahmad Jamaludin Fitroh
Jurnal Teknologi Dirgantara Vol 7, No.1 Juni (2009)
Publisher : National Institute of Aeronautics and Space - LAPAN

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Kurva daya merupakan indikator utama prestasi sebuah turbin angin. Dengan sudut pitch tertentu, turbin angin mempunyai kurva daya yang tertentu juga. Rotor dirancang agar turbin angin LPN-SKEA 50kW dapat menghasilkan daya 50 kW pada kecepatan angin 10 m/det dan kecepatan putar 80 rpm. Penambahan sudut pitch biasanya dilakukan untuk menambah torsi awal rotor sehingga rotor menjadi lebih mudah berputar dari kondisi diam. Pengaruh penambahan sudut pitch adalah berkurangnya kecepatan putar rotor sehingga daya yang dihasilkan juga menjadi lebih kecil. Hasil perhitungan menunjukkan bahwa penambahan sudut pitch hingga 10º akan mengurangi daya dari 50 kW menjadi 23,3 kW pada kecepatan angin 10 m/det. Dengan penambahan sudut pitch yang sama dan dengan mengasumsikan bahwa kurva daya merupakan polinomial pangkat tiga, maka daya sebesar 50 kW dapat dicapai pada kecepatan angin 12,9 m/det.
ANALISIS RADIUS AMAN AKIBAT KEGAGALAN STRUKTUR SUDU SKEA 50 KW PADA SAAT BEROPERASI Sulistyo Atmadi; Ahmad Jamaludin Fitroh
Jurnal Teknologi Dirgantara Vol. 8 No.1 Juni 2010
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Analysis on the safe radius of a blade structural failure during operation, is studied on this paper. The particular blade under analysis is the SKEA 50 kW LAPAN. The rotor is installed at 18 m height. The analysis is based on the modified straight motion and rotational momentum formulation. The result showed that at the maximum design rotational speed of 80 rpm, the blade would be thrown out of it centre to 73 m horizontally, and 35 m vertically above the ground. On the other hand, the failure at the root of the blade would be thrown and spinned at its centre of mass at the speed of 145 rpm.
RANCANGAN SISTEM ORIENTASI EKOR TURBIN ANGIN 50 KW Sulistio Atmadi; Ahmad Jamaludin Fitroh
Jurnal Teknologi Dirgantara Vol 5, No.2 Desember (2007)
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

A fin orientation system for wind turbine with a maximum capacity of 50 kw has been designed. The fin system is designed with for the yawing motion. The method used is based on the moment equilibrium criteria. Eccentricity distance of 10 cm was selected for the design. The location of the fin control is placed at the connection between the generator and the fin bar. The design procedures a fin bar of 6m, with the fin area of 25 m. The center of the fin force is located at 3 m from the nose. Whereas the fin angle to the center of the turbine axis is 21.9 degrees. Keywords: Wind turbin, fin, oreintation.
ANALISIS TEKANAN STATIK ALIRAN DI PERMUKAAN PITOT STATIK TEROWONGAN ANGIN TRANSONIK LAPAN Agus Aribowo; Ahmad Jamaludin Fitroh
Jurnal Teknologi Dirgantara Vol 5, No.2 Desember (2007)
Publisher : National Institute of Aeronautics and Space - LAPAN

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Abstract

Static pressure stream analysis has been done on the surface of pitot static for LAPAN transonic wind tunnel by means of numeric and analytic methods. Static pressure hole is placed at 25 cm behind static pitot leading edge. Numerical analysis result demonstrates that shock wave begins to rise under free stream with velocity of 0.9 march. Shock wave occurs in an area around static pitot leading edge so the stream velocity around static pressure hole almost equal with free stream velocity. There is shock wave that cause decreasing of stream total pressure. By known the total pressure and streamn velocity around static pressure hole then static pressure can be calculated. Mach number in the test section can be known from pressure ratio. Keywords: Static pitot, Shock wave, Static pressure, Transonic.
Co-Authors - Saeri Agus Aribowo Sulistio Atmadi Sulistyo Atmadi