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Angkasa: Jurnal Ilmiah Bidang Teknologi

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Published by Institut Teknologi Dirgantara Adisutjipto

ISSN : 20859503 EISSN : 25811355 DOI : 10.28989/angkasa

Core Subject : Science,

Computer Science & IT

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Articles 350 Documents

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IMPLEMENTASI RIGID BODY PADA RIGGING TERHADAP ANIMASI DINAMIS MODEL KENDARAAN TIGA DIMENSI Salam Aryanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 1 (2018): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Semakin berkembangnya teknologi, proses pemodelan dalam tiga dimensi saat ini menjadi jauh lebih mudah dari sebelumnya. Namun sebelum menganimasikan sebuah objek tiga dimensi memerlukan rigging secara manual untuk menentukan struktur kerangka internalnya. Peneliti akan melakukan eksperimen dengan beberapa skenario percobaan terhadap proses rigging untuk menghasilkan animasi kendaraan yang dinamis dengan memanfaatkan rigid body. Dalam hal ini implementasi rigid body pada rigging dilakukan karena rigid body sangat mirip dengan objek di dunia nyata. Memiliki gaya gravitasi dan gaya lainnya, seperti bisa bertumbukan dengan objek lain dan bisa saling mendorong antar objek. Secara khusus sistem rigging dengan mengimplementasikan rigid body pada model kendaraan tiga dimensi yang digunakan sebagai masukan akan menghasilkan rigging yang dapat digunakan untuk menciptakan massa dan gaya sehingga gerakan animasi kendaraan tiga dimensi lebih dinamis. Hasil penelitian ini menunjukkan bahwa Implementasi rigid body pada rigging model kendaraan tiga dimensi menghasilkan animasi yang dinamis karena rigid body dapat disimulasikan secara dinamis berkaitan dengan kontak dan tumbukan, serta objek yang dikendalikan secara dinamis merespon gerakan dan tumbukan dengan benda lain.

MOBILE-BASED OUTPATIENT QUEUE SYSTEM USING THE PRIORITY SCHEDULING AND FIRST COME FIRST SERVED SCHEDULING METHOD Anton Setiawan Honggowibowo; Dwi - Nugraheny; Saprudin - -
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 11, No 1 (2019): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

The outpatient queue system at the Pratama Clinic still uses manuals so that it can implement computerized technology (mobile) to improve health services for patients. In making this outpatient queue system application using the Priority Scheduling method which is a priority scheduling algorithm. Each process is equipped with a priority number (the smallest integer value is usually the biggest priority). This outpatient queue system is mobile based with the aim that patients can register online. Test results using a comparison of smartphones from the Android 4.1 version of Jelly Bean to the Android 7.0 version of Nougat can run. Comparison of distances in applications with google maps, get the same results and test application users using a questionnaire that is calculated with a Likert Scale to get 81.8% results including the "Very Good" category.

INFLUENCE OF PANDANUS TECTORIUS LEAF FIBER ON MECHANICAL PROPERTIES AND MORPHOLOGY OF POLYPROPYLENE COMPOSITE Fajar Nugroho; Sudarmanto Sudarmanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 1 (2020): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Natural fiber reinforced polymer composites are widely developed because of their relative low price and eco-friendly. One of natural fiber sourches is pandanus tectorius leaf. This study aimed to determine the effect of variations in fiber volume fraction on tensile strength, impact strength, bending strength and morphological on sea pandanus fibers- polypropylene composites.Tensile test spesimen refer to ASTMD 638, impact test spesimen refes to ASTMD 5942-96, bending test spesimen refer to ASTMD 790 -02. The increasing of the volume fraction increased the tensile strength and impact strength. The tensile test results showed the highest tensile strength results for composites with a volume fraction of 35% was 25.82 MPa. The impact test results showed that the highest impact strength was obtained in the 35 % volume fraction of 0.0062 Joule/mm2. The bending test results showed that the highest bending strength was obtained in the 20% volume fraction of 24.96 MPa. Based on SEM test results, there were voids, cracks, fibers pull out on the composite.

NUMERICAL SIMULATIONOF FLEXIBLE WINGOF HALE UAV USING TWO-WAY FLUID STRUCTURE INTERACTION METHOD Buyung Junaidin
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 1 (2017): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

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.

ANALISIS MIMO UNTUK PENINGKATAN KAPASITAS SISTEM SELULER 4G LTE PADA SISTEM KOMUNIKASI HIGH ALTITUDE PLATFORM STATION Catur Budi Waluyo
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

The development of technology has opened up a new wireless infrastructure to complement the satellite and terrestrial networks. High Altitude Platforms (HAPs) is a communications infrastructure that uses air balloon as a solution between terrestrial and satellite communications systems with medium coverage and low cost o f launching and maintenance. HAPs can be joined with a Long Term Evolution (LTE) technology standardized by the Third Generation Partnership Project (3GPP). LTE uses orthogonal frequency division multiplexing (OFDM) technology for downlink. OFDM technology is a technology that uses multicarrier and bring the data in parallel and the bandwidth is divided into several subcarrier. To improve the performance of LTE in an increase in capacity, coverage, and speed of data, then it can use MIMO techniques. MIMO is a technique using multiple antenna transmitter and receiver antennas that are used to overcome the problem of multipath fading and increase the capacity of the system to be serviced. MIMO support the achievement of high transmission speed. In the simulation, signals generated by the modified jakes model into a ricean channel using the K factor 1.41, 1.99, 2.33, 2.66, 4.61, 6.35, 9.21, 12.15, 16.77 dB with elevation angle of 1 0 ° to 90°. The larger the K factor, the smaller the shift doppler at each speed. Elevation angle have a relationship to the coverage area of HAPs, the smaller the elevation angle of the wider the coverage area, and the higher the position, the wider HAPs coverage area too. In ergodic capacity, the smaller the K factor, the smaller the elevation angle so that the capacity is also greater. System without estimation for the K factor o f 1.41dB and K 9.21dB is necessary for channel estimation and the Bit Error Rate (BER) o f the same system that made channel estimation has a better performance compared with the existing channel without estimation with the SNR improvement o f about 18 dB.

KAJIAN TINGKAT PELAYANAN PENUMPANG DI BANDARA ADISUTJIPTO YOGYAKARTA Sri Mulyani; Dwi Hartini
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 1 (2016): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Peak hours or peak hours and when there is an Air Force plane that doing regular exercise. Number apron at Yogyakarta Adisucipto international airport just 8 parking stand, while aircraft movement during peak hours reached 10 aircraft even more, so that the common line during the hours puncak. Untuk overcome this new airport Yogyakarta must be realized in order to fit with the capacity kebutuhannya.Kasus second, because the international airport Adisucipto a military-owned airports which are also used for commercial flights, then that becomes the top priority is owned aircraft Air Force. To and separate from military activities. So that flight activities more effective and can reduce the factor late arrival due to late landing. The technical problem is usually the plane will experience a delay can not predict how long the delay time and this factor also can not be in perediksi when it will be a problem with the engine, fuselage, landing gear, etc. So Line Maintenance personnel in the field should always be alert and responsive when things are going according to the maintenance manual. And always conduct appropriate inspection check list.

PENGARUH PERGAULAN TERHADAP KENAKALAN “ABG” DI YOGYAKARTA MENGGUNAKAN REGRESI LOGISTIK Ridayati Ridayati
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Junior and Senior High School is the period for what we called unstable of “Anak Baru Gede (ABG) ”. Application of high technology like internet, is the ordinary things for students of Junior and Senior High School in Yogyakarta, which is used for doing their homework. Nevertheless, high tech is usedfor looking friends through Facebook, Twitter, etc as well. Nowadays, ABG are always curious of the new things, that lead them to inappropriate research. Even more, lack of parents concern is impacted to immoral behavior. Besides, negative environment gives the fundamental factor to immoral behavior as well. Hence, it effected to mentally and morally degradation. The objective o f this research is for identifying the role of society to ABGs mischievousness in Yogyakarta. This research is used qualitative approach with case study 's methodology to obtain data and description related to ABG s mischievousness in Yogyakarta. Next, is using Logistic Regression analysis to analyze the connection. The result is Y=4. 7451.054 X equation. Hence, it concluded that increased one unit of society's role will decrease the degree of ABG s mischievousness by 1.054.

TWO LEVEL CLUSTERING UNTUK ANALISIS KUESIONER AKADEMIK DI STTA YOGYAKARTA Harliyus Agustian
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 1 (2018): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Untuk menjaga kualitas dosen, institusi melakukan evaluasi kinerja dosen yang dapat berupa kuesioner akademik dimana kadang hasilnya bersifat subyektif. Untuk itu perlu dilakukan pengecekan konsistensi tingkat kepuasan proses pengajaran dari hasil pengisian kuesioner dengan data akademik lainnya dengan pendekatan clustering. Untuk mengatasi hal tersebut dilakukan penelitian yang bertujuan untuk membangun sebuah aplikasi yang menerapkan pendekatan two level clustering dengan k-means dan average linkage clustering untuk mengetahui tingkat perbedaan kualitas proses belajar mengajar dosen menurut mahasiswa yang telah dikelompokkan berdasarkan data akademis. Model yang digunakan dalam penelitian ini adalah model two level clustering dengan dua tahapan cluster yaitu metode k-means dan average linkage clustering. Model ini digunakan untuk mengelompokkan data mahasiswa menjadi beberapa cluster berdasarkan data akademis mahasiswa dalam satu matakuliah sehingga data hasil cluster akademis dapat diklaster kembali berdasarkan jawaban kuesioner mahasiswa untuk setiap anggota cluster akademis. Hasil clustering level pertama menunjukkan jumlah cluster yang optimal adalah 2 dengan cluster yang terbentuk adalah mahasiswa dengan kemampuan akademis yang baik dan cukup, sedangkan jumlah cluster yang optimal untuk clustering level kedua adalah 2, dengan cluster yang terbentuk adalah mahasiswa merasa puas, cukup puas atau tidak puas terhadap proses pengajaran di kelas. Hasil interprestasi clustering akademik terhadap tingkat kepuasan mengajar dosen menunjukkan hasil yang sama diantara 2 cluster akademik.

Three-Dimensional Animation of Human Blood Circulation System Using High Poly and Particle System Techniques Nurcahyani Dewi Retnowati
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 2 (2018): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Circulatory system learning can use three-dimensional animation to facilitate the delivery of material in teaching and learning activities in elementary schools. In making the three-dimensional animation using Autodesk Maya software and 3Ds Max software. The techniques used include High Poly techniques and Particle System techniques. Heart and lung organs, visualized in three dimensions using High Poly techniques while animation of circulatory systems in humans using Particle System techniques. The application function test results indicate that this application can run according to its function and the results of testing the use of applications with the teacher respondents with calculations using a Likert scale obtained results of 97.2% and these results fall into the very good category (using the calculation of interval formulas), so that conclusions are obtained that the three-dimensional animation application of the circulatory system can be applied and can assist the teacher in providing student learning in elementary school.

IDENTIFIKASI STRUKTUR GEOLOGI DAN IMPLIKASINYA TERHADAP PENYEBARAN BATUAN FORMASI ANDESIT TUA – SENTOLO DI SUNGAI NITEN, GIRIPURWO, KULON PROGO AL HUSSEIN FLOWERS RIZQI
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 11, No 2 (2019): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Daerah penelitian termasuk dalam fisiografi Pegunungan Kulon Progo sebelah timur, tepatnya di Sungai Niten, Kecamatan Giripurwo, Kulon Progo, DIY. Penelitian ini bertujuan untuk mengidentifikasi struktur geologi dan hubungan stratigrafi Formasi Andesit Tua dan Formasi Sentolo. Metode penelitian meliputi pengamatan data struktur geologi meliputi data kekar dan sesar sedangkan data stratigrafi menggunakan metode pengukuran stratigrafi (MS) yang dilakukan di Formasi Andesit Tua bagian atas dan pada Formasi Sentolo bagian bawah. Berdasarkan hasil pengolahan data, sesar utama pada daerah penelitian adalah Right Slip Fault, dengan besaran rake yang didapat 5odan net slip N 340 oE. Bidang sesar utama memiliki arah dan kemiringan N 335o E / 55o. Arah gaya utama sesar diperoleh dari pembacaan (σ1) pada sesar utamayaitu didapatkan 50o, N 220oE,sesuai dengan arah umum extensional fracture yang berarah timurlaut – baratdaya. Pengaruh struktur geologi berupa sesar mendatar Mengkanan Niten, memotong satuan Breksi Andesit dan Batupasir Tufan karbonatan. Intepretasi pada peta geologi daerah penelitian terdapat offset pelamparan bukit di timur Sungai Niten. Offset bukit tersebut dikontrol oleh pergerakan Sesar Mendatar Mengkanan Niten. Hal itu didukung dengan sebaran satuan Breksi Andesit melampar hingga ke selatan di sebuah bukit kecil, sebelah timur Sungai Niten.

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