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Angkasa: Jurnal Ilmiah Bidang Teknologi
Published by Institut Teknologi Dirgantara Adisutjipto
ISSN : 20859503     EISSN : 25811355     DOI : 10.28989/angkasa
Core Subject : Science,
Computer Science & IT
Arjuna Subject : -
Articles 16 Documents
 1   2 
Search results for , issue "Vol 9, No 1 (2017): Mei" : 16 Documents clear
ANALISIS PENINGKATAN KAPASITAS SISTEM SELULER 4G LTE PADA SISTEM KOMUNIKASI HIGH ALTITUDE PLATFORM STATION Waluyo, Catur Budi; Astuti, Yenni
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.512 KB)

Abstract

In the development o f wireless communications, to provide high-speed data services and wide bandwidth become a challenge. One technique to make it happen is by using Multicarrier Orthogonal Frequency Division Multiplexing (OFDM) modulation, where in OFDM, frequency selective fading channel effect will be perceived flat fading by each subcarrier. One communication system that supports OFDM technology is Long Term Evolution (LTE) with various types of bandwidth configurations provided. To improve LTE performance in capacity building, coverage area and data rate, it can use multi antenna technique both in receiver and sender, and integrate with High altitude platform station (HAPs) system. In this study the estimation used is Linear Minimum Mean Square (LMMSE). The relationship o f the elevation angle and the K factor is directly proportional, but the elevation angle value is inversely proportional to the diameter o f the HAPs coverage area. In addition, the more the number o f used antennas, the greater the capacity served. Based on the simulation results, the system with estimation can be used to expand the coverage area to 215.77 km which is from 0.032 km in QPSK modulation, speed 60 kmpj with 2x2 antennas.
PEMODELAN MATEMATIK SISTEM HIDROLIK PADA MAIN LANDING GEAR EXTENSION DAN RETRACTION PESAWAT BOEING 737-900ER DENGAN PROGRAM MATLAB-SIMULINK Cahyono, Mohammad Ardi; Suwandi, Rahmat
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.055 KB)

Abstract

The problem that often arises in the hydraulic system when the main landing gear is done extension and retraction is the control o f the hydraulic motion and the fluid motion is very big influence on the hydraulic work process where the fluid flow must be ensured or arranged in such a way as to work properly. To overcome this problem, a mathematical modeling system is used to create a representation or an imitation o f the actual system, which links the output o f the system with its input in a mathematical relationship and its parameter values. The research was conducted by observation method and literature study to obtain the data and its calculation. The results o f this study obtained a description o f the response and dynamic characteristics o f the PID controller in the transfer function o f the hydraulic system when the main landing gear extension and retraction o f the nearest Boeing 737-900ER aircraft is the 5th time experiment by inputting PID controller value P = 13 I = 4 D = 3 with an error value o f 0.01887 and an overshoot o f1,0002. With a small error value or a 2% value limit and the response picture is not experiencing a large overshoot, then the picture o f the response in accordance with the expected in the 5th experiment where the error value o f 0.01887 and overshoot o f 1,0002. With an overview o f the response with this small overshoot then the accuracy o f the system will stop at the point corresponding to the actual system. By using this modeling, the response o f the main landing gear extension and retraction movements can be well studied thus providing a good understanding o f the performance of the hydraulic system. 
Algoritma Adaptif Sistem Downlink Menggunakan Recursive Least Square (RLS) Basukesti, Agus; Dirgantara, Bangga
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (99.46 KB)

Abstract

GPS (Global Positioning System) is the popular system for navigation which assistance 32 satellites orbiting the earth. Currently, tracking positions using the Global Positioning System (GPS) is one of the best positioning tracking methods. However, GPS has a lot o f noise, so filters are needed to handle with noise on GPS. In this research, the simulation is done to extract data from GPS sensors using RLS algorithm. From the results o f identification and simulation, it can be concluded that the algorithm works well and need to analyze the advantages and disadvantages to be implemented on the downlink system designed. From the simulation results obtained that error estimation is convergent that is the longer the smaller.
Visualisasi Alat Musik Tradisional Gong Waning Menggunakan Animasi 3D Retnowati, Nurcahyani Dewi; Nona, Kristina
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (287.119 KB)

Abstract

Gong Waning is a traditional musical instrument o f Sikka community o f East Nusa Tenggara which is played by beating. In its development, not many young people who can play this instrument. Therefore it is very necessary to design and create an animated model o f the introduction of traditional Gong Waning musical instruments using 3Ds.Max and on sound using unity software. The output o f visualization o f traditional musical instrument Gong Waning in the form o f animation and sound display so hopefully can be more easily in studying and using musical instrument Gong Waning.
ANALISIS FLIGHTDATA RECORDER KECELAKAAN PESAWAT TERBANG A320 UNTUK MENDAPATKAN STALL SPEED DAN PROSES REKONSTRUKSI KECELAKAAN MENGGUNAKAN SOFTWARE FLIGHTSCAPE Cahyono, Mohammad Ardi; Pandie, Andry Renaldy
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (314.147 KB)

Abstract

Aircraft is transportation mode which in it operation refer to all operation procedure be valid. Although that, accident probability will be occur. To help human/analysts to find out and learn more about aircraft accident causes then black box installed in aircraft. Parameters which recorded by black box still in bynari data type, so it must to be processing using Flightscape software and Google Earth application in order to represented and understood by analysts to help analysis process. It so happens, main purposes from this research are to know stall speed value from aircraft A320 which analyzed. Methods which used to finished this research that is simulation method in Flightscape to get video/animation o f flight accident reconstruction, and analysis method as manually to get stall speed o f aircraft.Based on analysis result, be obtained that aircraft stall speed value is 348,0942 kts (when first stall warning) and 150,8151 kts (when three secons before crash).
ESTIMASI CADANGAN BATUBARA DENGAN SOFTWARE TAMBANG PADA PIT DE DISITE BEBATU PT. PIPIT MUTIARA JAYA KABUPATEN TANA TIDUNG, KALIMANTAN UTARA Adnyano, A.A Inung Arie
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (250.894 KB)

Abstract

Lokasi penambangan PIT DE PT. Pipit Mutiara Jaya, Site Bebatu dengan lahan seluas 3.024 Ha terletak di Desa Bebatu Kebun, Kecamatan Sesayap Hilir, Kabupaten Tana Tidung, Provinsi Kalimantan Utara. Metode estimasi yang digunakan yaitu metode sayatan penampang (cross section) yang berdasarkan pada pedoman rule o f gradual changes dan rule o f nearest point. Estimasi pedoman rule o f gradual changes didapatkan total cadangan terkira adalah 2.605.121,944 ton, volume material gambut adalah 811.218,008 m3, volume material softclay adalah 4.413.869,289 m3, volume mixing adalah 2.206.934,637 m3 dan volume material hardclay adalah 11.638.177,066 m3. Perhitungan berdasarkan pedoman rule o f nearest point sebagai berikut: total cadangan terkira adalah 3.047.878,132 ton, volume material gambut adalah 918.114,558 m3, volume material softclay adalah 5.040.942,037 m3, volume mixing adalah 2.520.471,018 m3 dan volume material hardclay adalah 12.858.788,961 m3. Nilai stripping ratio dari hasil kedua perhitungan adalah sebagai berikut: untuk pedoman rule o f gradual changes dengan nilai SR 7,32 BCM : 1 ton dan untuk pedoman rule o f nearest point dengan nilai SR 7 BCM : 1 ton.
NUMERICAL SIMULATIONOF FLEXIBLE WINGOF HALE UAV USING TWO-WAY FLUID STRUCTURE INTERACTION METHOD Junaidin, Buyung
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

This paper describes numerical simulation o f flexible High Altitude Long Endurance Unmanned Aerial Vehicle (HALE UAV)wingusing two-way fluid structure interaction (FSI) method. The HALE wing is designed with high aspect ratio. This configuration intended to reduce the vehicle induced drag and reduces the lift-loss at wingtip which caused by wingtip vortex. But the structure of the wing itself becomes more elastic that be able to give large deformation when the aerodynamic loads applied. This deformation changes the aerodynamic loads distribution on the wing that gives a new deformation to the wing structure and vice versa. This interaction in a couple process called as fluid structure interaction (FSI). ANSYS 15.0 software was used to simulate fluid structure interaction on the wing. The unsteadiness and viscous flows at low speed are evaluated using the solution o f timedependent Reynolds Averaged Navier-Stokes (RANS) with SST k-rn turbulent model. In addition, multiblock structured grids are generated to provide more accurate viscous result and to anticipate negative volume o f the mesh which may occur due to the deformation o f the wing during simulation. Five different o f simulations are performed with variation o f material characteristics including Young’s modulus and Poisson’s ratio.The results are global aerodynamic characteristics at various material characteristics.
EVALUASI KERENTANAN GEDUNG REKTORAT STTNAS TERHADAP GEMPA BUMI BERDASARKAN ANALISIS MIKROTREMOR Prastowo, Rizqi; Prabowo, Urip Nurwijayanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (242.247 KB)

Abstract

STTNAS building is a five floor building that located in the city o f Yogyakarta which is an area with a high intensity earthquake occurrence. The purpose o f this study is (1) determine the value o f the natural frequencies o f the building, (2) determine the index o f the resonance o f the building and (3) the vulnerability o f buildings to earthquakes. Research will be done by measuring the microtremor wave o f building STTNAS then analyzed using Spectral Floor Ratio (FSR). The analysis result is then compared with the classification defined in ISO 2002 on building resilience planning procedures earthquake. Fekuensi natural on the east-west component is 1.64 Hz and the north-south component is 1.644 Hz that is in conformity with the ISO 2002. Resonance Index o f building STTNAS is ranging from 31.00081 to 35.883% thus including the low category resonance during an earthquake. Building of STTNAS vulnerability index ranges are between 103,670.6191 to 82526.5357 with the highest value found on the 4th floor.
ANALISIS PENINGKATAN KAPASITAS SISTEM SELULER 4G LTE PADA SISTEM KOMUNIKASI HIGH ALTITUDE PLATFORM STATION Catur Budi Waluyo; Yenni Astuti
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.512 KB) | DOI: 10.28989/angkasa.v9i1.109

Abstract

In the development o f wireless communications, to provide high-speed data services and wide bandwidth become a challenge. One technique to make it happen is by using Multicarrier Orthogonal Frequency Division Multiplexing (OFDM) modulation, where in OFDM, frequency selective fading channel effect will be perceived flat fading by each subcarrier. One communication system that supports OFDM technology is Long Term Evolution (LTE) with various types of bandwidth configurations provided. To improve LTE performance in capacity building, coverage area and data rate, it can use multi antenna technique both in receiver and sender, and integrate with High altitude platform station (HAPs) system. In this study the estimation used is Linear Minimum Mean Square (LMMSE). The relationship o f the elevation angle and the K factor is directly proportional, but the elevation angle value is inversely proportional to the diameter o f the HAPs coverage area. In addition, the more the number o f used antennas, the greater the capacity served. Based on the simulation results, the system with estimation can be used to expand the coverage area to 215.77 km which is from 0.032 km in QPSK modulation, speed 60 kmpj with 2x2 antennas.
PEMODELAN MATEMATIK SISTEM HIDROLIK PADA MAIN LANDING GEAR EXTENSION DAN RETRACTION PESAWAT BOEING 737-900ER DENGAN PROGRAM MATLAB-SIMULINK Mohammad Ardi Cahyono; Rahmat Suwandi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (244.055 KB) | DOI: 10.28989/angkasa.v9i1.110

Abstract

The problem that often arises in the hydraulic system when the main landing gear is done extension and retraction is the control o f the hydraulic motion and the fluid motion is very big influence on the hydraulic work process where the fluid flow must be ensured or arranged in such a way as to work properly. To overcome this problem, a mathematical modeling system is used to create a representation or an imitation o f the actual system, which links the output o f the system with its input in a mathematical relationship and its parameter values. The research was conducted by observation method and literature study to obtain the data and its calculation. The results o f this study obtained a description o f the response and dynamic characteristics o f the PID controller in the transfer function o f the hydraulic system when the main landing gear extension and retraction o f the nearest Boeing 737-900ER aircraft is the 5th time experiment by inputting PID controller value P = 13 I = 4 D = 3 with an error value o f 0.01887 and an overshoot o f1,0002. With a small error value or a 2% value limit and the response picture is not experiencing a large overshoot, then the picture o f the response in accordance with the expected in the 5th experiment where the error value o f 0.01887 and overshoot o f 1,0002. With an overview o f the response with this small overshoot then the accuracy o f the system will stop at the point corresponding to the actual system. By using this modeling, the response o f the main landing gear extension and retraction movements can be well studied thus providing a good understanding o f the performance of the hydraulic system. 

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