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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 343 Documents
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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

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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. 
ANALISIS ELEMEN HINGGA UNTUK FAKTOR KONSENTRASI TEGANGAN PADA PELAT ISOTROPIK BERLUBANG DENGAN PIN-LOADED Hartini, Dwi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 1 (2016): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Hole in the structure is often a serious problem, because the hole would trigger a surge in stress concentration which resulted cracks in the structure. In this research will analyze the stress concentration factor on isotropic plate with hole. The method used is numeric method. The technique used to collect data is the study of literature and comparative study of several similar research. Then the design is modeled and analyzed using Patran/Nastran. Based on this analysis the final result obtained is a mathematical equation that can be used to predict the stress concentration factor at the isotropic plate with hole where the results approached to Peterson distribution is used as reference in this research.
STUDI KOMPARASI PENGARUH VARIASI ARUS PENGELASAN TERHADAP KEKUATAN IMPAK, KEKERASAN, DAN STRUKTUR MIKRO SAMBUNGAN LAS PEGAS DAUN BAJA SUP 9 PADA PROSES LAS SMAW Nugroho, Fajar
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 2 (2017): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Abstract Spring is a component that functions to receive dynamic load and providescomfort in driving. The problem is the leaf spring is sometimes broken due to theoverload or unfavorable road conditions. The solution for that problem is grafting using the SMAW welding.This study aims to determine the effect of variations in the welding currentto the impact strength, hardness and microstructure. Types of weld used is SMAW with a variety of welding current of 100 A, 120 A and 140 A and the type of seam used is the type of seam V.The highest impact strength test was 1.698 j/mm2at 100 A and the highest hardness test was 355.338 HVN at 140 A. In addition, the micro structure at the welding area has bigger grain size and more pearlite structure at 140 A. Keywords: welding current, impact strength, hardness, micro structure AbstrakPegas adalah suatu komponen yang berfungsi untuk menerima beban dinamis dan memberikan kenyamanan dalam berkendara. Permasalahan yang sering dialami oleh pegas daun adalah patah akibat beban lebih atau kondisi jalan yang kurang baik. Penanganan pada hal seperti ini adalah penyambungan menggunakan las SMAW.Penelitian ini bertujuan untuk mengetahui pengaruh variasi arus pengelasan terhadap kekuatan impak, kekerasan dan Struktur mikro. Jenis las yang digunakan adalah las SMAW. Variasi arus pengelasan yang digunakanadalah 100 A, 120 A dan 140 A. Jenis kampuh yang digunakan adalah jenis kampuh V.Hasil uji kekuatan impak tertinggi diperoleh pada variasi arus 100 A yaitu sebesar 1,698 J/mm2. Hasil uji kekerasan tertinggi diperoleh pada variasi arus 140 A yaitu sebesar 355,338 HVN. Struktur mikro pada daerah las memiliki ukuran butiran yang semakin besar dan struktur perlit yang semakin banyak untuk variasi arus 140 A.Kata kunci: arus pengelasan, kekuatan impak, kekerasan, struktur mikro
PENGARUH PERGAULAN TERHADAP KENAKALAN “ABG” DI YOGYAKARTA MENGGUNAKAN REGRESI LOGISTIK Ridayati, Ridayati
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

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 societys role will decrease the degree of ABG s mischievousness by 1.054.
ANALISIS MIMO UNTUK PENINGKATAN KAPASITAS SISTEM SELULER 4G LTE PADA SISTEM KOMUNIKASI HIGH ALTITUDE PLATFORM STATION Waluyo, Catur Budi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

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.
THE ALKALI TREATMENT PARAMETERS USING TAGUCHI MODEL IN ORDER TO OBTAIN THE OPTIMUM TENSILE STRENGTH OF SINGLE KENAF FIBER Pratiwi, Henny
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

The development of high-performance engineering products made from natural resources is increasing worldwide. Kenaf plants have been extensively exploited over the past few years. Chemical treatment is considered to modify the fiber surface properties. In this study, kenaf bast fibers were treated with various concentrations of NaOH with different immersed time, immersed temperature, and dried temperature. Fiber bundle tensile were performed to evaluate the effect of treatments on the fiber tensile strength. Taguchi Methods are used in order to obtain the optimal parameter which could affect the tensile strength of kenaf fibers. Three-Level Orthogonal array is used to design the experiment. Finally, the experimental results will be evaluated using analysis of variance (ANOVA). The analysis of variance (ANOVA) shows that the most significant alkali parameter is NaOH concentration, which accounts for 40.19 percent of the total. It is also found that the optimum treatment is kenaf immersed in 3 wt. percent NaOH solution for 1 hour at 33 degrees celcius and dried at 60 degrees celcius which is supported by the Fourier Transform Infrared Spectroscopy.
Analisis Perbedaan Genre Game Pada Google Playstore Menggunakan Parameter Tracy Fullerton Satria, Dhimas Adi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 1 (2018): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Game merupakan salah satu hiburan yang diminati banyak orang. Tidak melihat umur ataupun profesinya, siapa saja senang untuk bermain game. Perkembangan Android menjadi sebuah sistem operasi telepon pintar yang paling banyak digunakan di  dunia. Pertumbuhan jumlah game yang disediakan pada Google Playstore sebagian besar tergolong sebagai game gratis yang bisa diunduh oleh siapa saja. Penelitian ini bertujuan melakukan evaluasi terhadap struktur desain game yang dibuat oleh Tracy Fullerton, dengan mengembangkan variable yang diuji pada setiap genre game yang ada pada Google Playstore. Diharapakan setiap genre memiliki karakteristik dan kelemahan sebagai patokan data bagi para developer dan desainer game untuk menciptakan game yang lebih variatif.
ANALISIS KECELAKAAN PENERBANGAN DI INDONESIA UNTUK PENINGKATAN KESELAMATAN PENERBANGAN Poerwanto, Eko; Mauidzoh, Uyuunul
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Achievement level of aviation safety can be achieved with the proper function of all components of the system in the aviation industry which consists of airport operators, airline operators, air traffic operators and aircraft maintenance operator, as well as the regulations set by the regulator. Every incident should be investigated aviation accidents to fin d the cause. This is to provide appropriate recommendations so that the same airline accident does not happen again. The increasing number of flights that are needed with safety guarantees. So it is importance to analyzed routine flight accident to improve the safety performance of airlines. This research is descriptive analysis with qualitative methods. Flight accidents data that have investigated from NTSC and DGCA grouped causes are then recommendations have been made by the NTSC also grouped for each operator stakeholders. Improved system of aviation safety in Indonesia can be done with a thorough analysis based on the results of investigation of NTSC whose recommendations have been given to all stakeholders in the aviation industry. The results showed that the causes of flight accidents in Indonesia is dominated by the human factor the percentage reached 60%. The highest number of the recommendations given by the NTSC to DGCA as many as 208 recommendations during the period 2007-2014 but the trend o f declining. On other side of the trend of the recommendations given to aviation operators showed an increase. This shows an increase in the duty on DGCA to always supervise, and set the standard flight operations carried out by several airline operators in Indonesia.
PERANCANGAN SISTEM PENDUKUNG KEPUTUSAN DALAM PENENTUAN JENIS TANAMAN PALAWIJA BERDASAR KANDUNGAN ZAT LAHAN GUNA MENINGKATKAN PRODUKTIVITAS LAHAN (STUDI KASUS DI KABUPATEN GUNUNGKIDUL) Indrianingsih, Yuliani
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 1 (2016): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Penelitian ini bertujuan untuk memperbaiki produktivitas lahan, agar lahan dapat ditanami jenis palawija yang tepat berdasar kandungan zat lahan itu. Banyaknya masyarakat petani yang masih menggunakan pembelajaran secara otodidak dan pengalaman secara turun temurun dalam penentuan jenis tanaman palawija yang ditanam mereka, menyebabkan hasil panen yang tidak maksimal. Sehingga dibutuhkan sebuah Sistem Pendukung Keputusan (SPK) yang dapat membantu para petani untuk menentukan jenis tanaman palawija yang cocok berdasarkan kandungan zat atau unsur hara lahan yang akan diolah. Penelitian dilakukan di Kecamatan Paliyan, Saptosari dan Panggang di Kabupaten Gunungkidul untuk pengambilan data di lapangan, dan di instansi Sekolah Tinggi Teknologi Adisutjipto Yogyakarta yaitu di Laboratorium Komputasi untuk pengolahan datanya. Hasil dari pengambilan data di lapangan tersebut dapat menjadi tolak ukur bagi para pengambil keputusan petani untuk menentukan jenis tanaman palawija yang akan ditanam berdasarkan kriteria unsur hara lahan. Kriteria yang menjadi tolak ukur penentuan jenis tanaman palawija adalah Kapasitas Tukar Kation atau KTK, Kejenuhan Basa, O, Ca, C/N, Kalium, Magnesium, Carbon, Natrium, dan Calsium. Penentuan tingkat kepentingan masing-masing kriteria dan untuk menghitung nilai kesesuain jenis tanaman palawija berdasarkan masing-masing kriteria tersebut menggunakan metode ELECTRE. Berdasarkan teori yang ada dan kesesuaian data yang di lapangan, dalam penelitian ini menunjukkan bahwa metode ELECTRE dapat diimplementasikan dengan baik sebagai sistem pendukung keputusan yang dapat membantu menyelesaikan permasalahan penentuan jenis tanaman palawija yang akan ditanam guna meningkatkan produktivitas lahan. Hasil perhitungan manual maupun implementasi sistem menunjukkan Kecamatan Paliyan cocok ditanamai kedelai, Kecamatan Saptosari dan Panggang cocok ditanami jagung, karena struktur tanahnya sama. Dengan sistem yang dibangun ini, peran user yaitu petugas penyuluh pertanian dapat mengarahkan para petani untuk memilih jenis tanaman palawija yang sesuai dengan kandungan zat lahan, sehingga produktivitas lahan meningkat. Diharapkan, kedepannya hasil pertanian maksimal, sehingga nilai ekonomi dan kesejahteraan petani di wilayah Kabupaten Gunungkidul akan lebih baik dari sebelumnya.
ANALISIS POTENSI PANAS BUMI DENGAN METODE GEOMAGNET DI DAERAH GEDONG SONGO UNGARAN JAWA TENGAH fatimah, fatimah
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 1 (2018): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Panas bumi adalah energi terbarukan dan berkelanjutan yang dapat digunakan untuk menggantikan energi fosil di masa depan. Energi panas bumi dapat digunakan, harus memenuhi sistem panas bumi, sistem panas bumi adalah istilah umum yang digunakan untuk membahas interaksi antara sistem batuan dengan suhu air yang tinggi. Indikasi sistem panas bumi biasanya ditandai dengan munculnya manifestasi permukaan, bisa termasuk sumber air panas, fumarol, kolam lumpur dan lain - lain. Kehadiran mata air panas dan fumarol di kawasan Gunung Ungaran merupakan indikasi kuat potensi panas bumi bawah permukaan. Penelitian ini dilakukan untuk mengetahui energi panas bumi di bawah permukaan dan membuat model sistem panas bumi berdasarkan analisis survei geologi, geokimia dan geomagnetik. Geologi Ungaran itu sendiri disusun oleh batuan vulkanik Tersier dari Miosen sampai Pleistosen, yang diduga sumber panas di Ungaran adalah sisa-sisa dari kaum muda Holosen Ungaran. Struktur di Ungaran dikendalikan oleh patahan yang mengarah ke barat daya - timur laut, yang merupakan bagian dari struktur keruntuhan, struktur ini diduga sebagai daerah pelepasan, sehingga cairan dan uap dari reservoir keluar melalui zona lemah dan muncul di permukaan. Dari peta Geomagnetik yang menunjukkan tingkat magnetik rendah berkisar antara -185 sampai -3,3 nT yang ditafsirkan sebagai sumber panas di Ungaran, setelah menggunakan penyaringan dengan distribusi perpanjangan ke atas sumber panas meluas ke utara Gedongsongo. 

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