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All Journal Jurnal Teknologi Energi Indonesian Journal of Aerospace
Sulistyo Atmadi
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Aerospace Engineering Astronomy Computer Science & IT Energy

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PENGARUH VARIASI SUDUT SERANG SUDU PADA PRESTASI TURBIN ANGIN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin; Hartono, Firman
Indonesian Journal of Aerospace Vol. 4 No. 2 (2006): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Research on variations of angle of attack turbine blade has been conducted to investigate their correlation with windturbine performances, and for these purposes, AEROFOIL LS (1)-0417 MOD has been selected with 4 angle variations. The first variation is selscted with constant slipstream, the second with Cl max of 0.3, while the third and fouth variations with Cl max of 0.5 and 0.7 respectively. Based on blade element and momentum theory for obtaining efficiency, the following results for all the four variations are 18.15 percent, 16.46 percent, 16.15 percent and 16.26 percent. Hence, it can be concluded that, a highest efficiency is obtained with a constant slipstream as in case 1. In practice, to achieve such configuration, a more accurate blade fabricantion process is required to obtain the highest efficiency.
SIMULASI PENGUJIAN PRESTASI SUDU TURBIN ANGIN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 4 No. 2 (2006): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

Identification of whether aerodynamic performances of a rotor blades has met the criteria according to its design or not, the general procedure is to fabricate and perform a field testing; or testing its model in a windtunnel. Both method require high cost however; therefore, a simulation method using Fluent software had used for obtaining lower cost. The model used in an LS (1)-0417 Mod airfoil having 3 blades and rotor diameter 7.21 m. Simulation test shows a good result with a difference of 4.61 percent for torque and power from design result.
EFEK DEFLEKSI PADA SUDU TURBIN ANGIN TERHADAP KELUARAN DAYA Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 4 No. 1 (2006): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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The type of material used in the fabrication of wind turbine blade is a very important factor so that it will not exceed the allowable maximum deflection. An analysis is conducted to study this deflection effect to that power output and as case study, a 7.6 m blade of 10 kW LPN 10000 E turbine is used. Several assumption as such as deflection due to wind speed at perpendicular to local plane local blade are diameter blade and direction of aerodynamic at aerofoil plane local blade are considered. The distribution of blade deflection along the twisted span is assumed uniform. Calculation is performed for the polynomial order of 2,3 and 4, with variety of deflection of 0.2 m, 0.5m, 1 m and 1.5 m. for design wind speed of 9 m per s it was found that for 0.5 deflection, the losses of 6 percent, 9 percent and 12 percent for blade shape polynomial order 2,3 and 4 consequentively are produced; whereas for 1.5 m deflection, losses are 46 percent, 53 percent, and 56 percent for the same polynomial shape. If a maximum loss of 10 percent is taken, then the max allowable deflection is 0.5 m.
RANCANGAN DAN ANALISIS STRUKTUR SUDU TURBIN ANGIN LPN 10000 E Atmadi, Sulistyo; Hartono, Firman
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.a816

Abstract

Structure of the LPN 10000 E wind turbine blade has been manufactured and its structural analysis to find out the strenght of this structure during its operation has also been conducted. The method of aero bending moment and centrifugal bending moment and load has been used while neglegting frcitional and torsional load. The analysis is obtained for composite blade strengthened by high strength carbon unidirectional reinforcement composite. With safety factor of 1.3 minimum, it was concluded that the blade is strong enough to use at its designed operational load.
PENELITIAN DAN RANCANGAN OPTIMAL TURBIN PENGGERAK TEROWONGAN ANGIN SUBSONIK SIRKUIT TERBUKA LAPAN Atmadi, Sulistyo
Indonesian Journal of Aerospace Vol. 2 No. 2 (2004): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2004.v2.a801

Abstract

In an effort to improve flow condition and flow speed up to 50 m per s inside LAPAN Subsonic Wind Tunnel, an existing power system and turbine has to be redesigned. Specifications for these requirments have been determined and calculated for the required power and aerofoil type and their dimensions. A method based free vortex design was used to get optimal result. The optimization result produced a turbine with 3 m diameter, with 10 blades, 1.5 m hub diameter. A D RAF PROPELLER aerofoil type was used to produce 230 HP power and 1824 Nm torque, with an efficience 89 percent. This result was considered both technically and economically.
ANALISIS DAN OPTIMASI SUDU SKEA 5 KW UNTUK PEMOMPAAN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 8 No. 2 Desember (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

LAPAN Wind Energy Conversion System (WECS) for pumping (SKEA-MARUTO) has a rotor diameter of 4.5 m and 6 number of blades. The blade used is a curved plate area. The result of recalculation has shown that operational condition on 10 m/sec wind speed and 100 rpm rotational speed, the rotor produces 4.74 kW. By assuming of 20% generator losses, the SKEA will produces power of 3.79 kW. To improve this performance to 5 kW, the rotor diameter has to be increased to 6 m. Chord and twist distribution are made similar to the previous design, and remain unchanged. Calculation is made by varying number of blades and blade rotation. At the wind speed of 10 m/sec and the rotational speed of 100 rpm, the SKEA able to produce the power of 6.36 kW.
ANALISIS RADIUS AMAN AKIBAT KEGAGALAN STRUKTUR SUDU SKEA 50 KW PADA SAAT BEROPERASI Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 8 No. 1 Juni (2010): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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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.
ANALISA PENGARUH SUDUT PITCH, UNTUK MEMPEROLEH DAYA OPTIMAL TURBIN ANGIN LPN-SKEA 50 KW PADA BEBERAPA KONDISI KECEPATAN ANGIN Atmadi, Sulistyo; Fitroh, Ahmad Jamaludin
Indonesian Journal of Aerospace Vol. 7 No. 1 Juni (2009): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

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Abstract

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 10ยบ 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.
PENGARUH KETIDAKLURUSAN DAN KETIDAKSIMETRISAN PEMASANGAN SIRIP PADA PRESTASI TERBANG ROKET RX-250-LPN Atmadi, Sulistyo; Riyadi, Ahmad
Indonesian Journal of Aerospace Vol. 1 No. 2 Desember (2003): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2003.v1.a778

Abstract

The performance of a rocket depend on several factor, one of which is the value of drag experienced during flight. This drag is contributed by the shape and the many components of the rocket. This paper discussed the fin misalignment and asymetrisness in respect to its main axis, which results in a change in the drag of RX-250-LPN rocket. The discussion was conducted with assuming the variation of this fin alignment from 1 degree to 2 degree. DATCOM was used to obtain aerodynamic parameters of the rocket. In addition, MATLAB 6.3 was used to calculate the performance of rocket. The knowledge of this fin misalignment can be used to get the minimum accuracy needed for better fin setting during rocket assembly.
PENGARUH TEMPERATUR SISTEM PADA FIGURE OF MERIT STASIUN BUMI PITA S DAN PITA X Surjo, Achmadi; Atmadi, Sulistyo
Indonesian Journal of Aerospace Vol. 1 No. 2 Desember (2003): Jurnal Teknologi Dirgantara
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30536/j.jtd.2003.v1.a780

Abstract

One of the veri important in a satellite communications system is the figure of merit for space segment as well as for the ground segment. The parameter which will be discussed in this paper is the figure of merit of a ground station of S band and X band for remote sensing system application. The parameters which influences it are antenna gain and temperature of system. The antenna which will be used is parabola antenna whose magnitude gain depends on diamter and efficiency of reflector. While the ground station antenna moves to track the desired satellite, so the elevation angle changes as well as the azimuth angle. On S band system influence of rain cab be ignored, while on the X band the influence needs to be considered. From the analysis conducted at 0.1 time percentage, the result is influence of rain to the "figure of merit is necessary to be estimated.
Co-Authors Agus Ariwibowo, Agus Ahmad Riyadi Fitroh, Ahmad Jamaludin Hartono, Firman Markis, Yus Kadarusman Pamungkas, Iqbal Surjo, Achmadi Suryono, Fajar Zain, Rais