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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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ANALISIS KEKUATAN STRUKTUR REPAIR SKIN DOUBLER PESAWAT B737-300 Santoso, Djarot Wahju
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Fuselage is a structure of airplane as the location where the passengers and goods as well as to place the wing and other structures. Fuselage gets loading when the aircraft take off, flight maneuvers, landing and when at the ground. One is the pressure loading on the fuselage aircraft cabin. In continuous operation airplane due to cabin pressure damage such as cracks often occur in the fuselage. The use of skin doubler to handle cases mainly crack analysis is needed to see the effect doubler thickness and variations in fastener against the structure strength. In this study doubler skin structure modeling and analysis using software CATIA V5R21. Modeling structures made 4 types of structure to use variations of the number of fastener and three other structures to changes in the thickness of the doubler. The whole model is given tensile load and differential pressure. Use of doubler thicker in the repair structure will lower the stress that occurs at the doubler. The more number of rows of fastener used will decrease the stress on the fastener this happens to tensile load, but not effective enough for the load pressure differential. Modeling the structure is safe against tensile loading and internal pressure.
METODE NILAI JARAK GUNA KESAMAAN ATAU KEMIRIPAN CIRI SUATU CITRA (KASUS DETEKSI AWAN CUMULONIMBUS MENGGUNAKAN PRINCIPAL COMPONENT ANALYSIS) Nugraheny, Dwi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

One commonality or similarity matching phase characteristics of an image is by using the method of distance measurement. Distance is an important aspect in the development of methods of grouping and regression. Before the grouping of data or object to the detection process, first determined the size of the proximity distance between data elements. In this study, there will be a comparison of several methods including distance measurement using Euclidean distance, Manhattan/ City Block Distance, Mahalanobis which will be implemented in the case of cumulonimbus image clouds detection using Principal Component Analysis (PCA). The average percentage of accuracy of image similarity value Cumulonimbus clouds using the Euclidean distance method was 93 percent and the distance Manhattan/ City Block Distance is 90 percent, while the Mahalanobis distance method was 50 percent.
ANALISIS BEBAN KERJA MENTAL PADA OPERATOR AIR TRAFFIC CONTROLLER (ATC) DENGAN METODE SUBJEKTIF DAN OBJEKTIF (STUDI KASUS : AIRNAV BANDAR UDARA XYZ) Fathimahhayati, Lina Dianati
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 10, No 1 (2018): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

An Air Traffic Controller (ATC) operator is required to always concentrate on monitoring navigation, radiation as well as supervising and implementing aircraft guidance. Obviously such work can lead to a mental workload on the worker. Based on these problems, it is necessary to do a research on the analysis of mental workload on the operator ATC at XYZ Airport. Measurement of mental workload can be done in two ways: subjective measurement and objective measurement. Subjective measurements of the mental workload can be done with NASA-TLX method. While the objective measurement can be done by doing the measurement physiologically such as through the heart rate. The results showed that the metal workload of ATY operator of XYZ Airport was in high category and very high base on subjective measurement. Performance level is the dominant factor causing high mental work load perceived by ATC operator. While based on the objective measurement found that the mental workload of ATC operators are in the medium category.
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

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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.
ANALISIS STANDAR JUMLAH PERSONEL PENANGANAN PENGANGKUTAN BARANG BERBAHAYA DI BANDAR UDARA ADISUTJIPTO Gunawan, Gunawan; Medianto, Rully
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 1 (2016): Mei
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Good and efficient Air cargo handling, especially for dangerous goods transportation need to be supported by licensed dangerous goods handling personnel and supported by the transport handling facilities as well as standard procedure. Comprehensive standards and procedures are required to reduce the risk of accidents caused by an error in the handling of the dangerous goods transportation. Main problems in this study: first, to analyse the process of air cargo transportation handling at the Adisutjipto Airport; second, to analyse the standard of the dangerous goods handling personel. The cargo handling process consists of Outgoing (Acceptance, weighing, Documentation, Marking & labeling, X-ray, Storage, Build-up, and Loading) and Incoming (Check Incoming Massage, Unloading, Breakdown, check lists, Physical Examination, Storage, Notice of Arrival, Delivered). The mathematical model of Dangerous Goods Handling Personnel Number Standard: DG Personel Cargo Agent Type A = c.% DG. (2,89 x 10^-2) DG Personnel Warehousing Type B = c.% DG (4,53 x 106-3), DG Personnel Airline Type B = c.%DG. (4,89 X 10^-4).
USING MATLAB TO HELP STUDENTS UNDERSTANDING GAUSS-JORDAN METHODS Funny, Rindu Alriavindra
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 9, No 2 (2017): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

There are many variation of Gauss-Jordan Calculator. Students can use it to solve various types of linear equations.  But all of them just straightly show the result. There is no such calculator which shows the step by step to get the result. Therefore, the students cannot understand how to do Gauss-Jordan Elimination. One program that can be developed to make Gauss-Jordan calculator is matlab. This article examines matlab program which can help students to understand Gauss-Jordan Elimination methods. It tends to focus on the process to get solution. This program reveals with the step by step of operation in Gauss-Jordan to make reduced row-echelon form. Numbers of operations drawn in the solutions of linear simultaneous equations have also been showed. This paper has a propensity to appraise the performance of matlab program in solving linear equation problems with n variables while showing every steps of Gauss-Jordan Elimination. Further it has the potential to develop this program to be a calculator that can be access without opening matlab. 
SISTEM PAKAR DIAGNOSA PERMASALAHAN PADA PESAWAT CESSNA GRAND CARAVAN 208B MENGGUNAKAN METODE BACKWARD CHAINING Rianto, Rianto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Success of an aircraft mechanic is to find a problem and solve it. Analysis of the problems in the Cessna Grand Caravan 208B needed someone expert in the field of aircraft mechanics. In this research expert system is used to provide easily diagnose problems with the Cessna Grand Caravan 208B by adopting the knowledge possessed from a professional mechanic, then take it into the software, that will be called by the expert system. Backward Chaining method used to obtain the results as expected by a professional mechanic. Search tecniques used to supplement the backward chaining method is a Best-First Search technique. Best-First Search Techniques is a search technique to that used to perform a search based on the knowledge gained to conduct a proper solution where it is located.
ANALISIS PENERAPAN MODEL UTAUT (UNIFIED THEORY OF ACCEPTANCE AND USE OF TECHNOLOGY) TERHADAP PERILAKU PENGGUNA SISTEM INFORMASI (STUDI KASUS: SISTEM INFORMASI AKADEMIK PADA STTNAS YOGYAKARTA) Handayani, Trie; Sudiana, Sudiana
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

The appears of the popularity of web technologies and applications have created a vast opportunity for organizations, including institutions of higher education. With the presence of Academic information systems (SiAkad) that is in STTNAS, then do some research to find out the intention of the behavior in the use of Academic information systems using the UTAUT model (Unified Theory Of Acceptance And Use Of Technology). The phenomenon underlying this study is: not yet optimal use of Academic information systems by civitas academic (professors, students and employees) in the process of learning and socializing, so the existence of maximal and havent yet SiAkad his crisp utilization impact of its use for the entire civitas academic. The study was limited in its scope: the analysis of the influence of Performance Expextancy, Expextancy Effort, Social Influence and Facilitating Condition against the intention SiAkad usage behavior in STTNAS in Yogyakarta. The data in the study on the test with the SEM analysis tool (Structural Equation Modeling). SEM is a tool of statistical analysis that are used to complete the research of multilevel models simultaneously. SEM can be used to solve equations with variables that make up the path. Research results based on the analysis and discussion is a variable PerformanceExpectancy (PE), Social Influence (SI) and Facilitating Condition (FC) effect significantly to Behavioral Intention, while variable Effort Expectancy (EE) provides results that are not significant. Fourth overall Predictor is only able to explain the impact on behavioral intention of 37,6 percent.
PENGGUNAAN WATER HEATING PADA MESIN PENGKONDISIAN UDARA SEBAGAI ALAT PENGENDALI KELEMBABAN UDARA DI DALAM RUANG OPERASI DI RUMAH SAKIT Wardoyo, Wardoyo
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 7, No 2 (2015): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

This research was aimed to observe the performance of water heating as an air moisture controller device in a hospital surgery room. The way the research was outside air in 27 degrees until 30 degrees celcius and moisture of 60 until 70 percent made suitable with requirement conditions determined for surgery room in the hospital i.e. 19 until 24 degrees celcius and moisture of 45 until 60 percent. To make that condition, the surgery room was equipped with air conditioner machine and water heating as an air moisture controller device. Hot water was circulated in water heating and air moisture was measured by a hygrometer. Out of this research it obtained: measuring moisture value higher than theoretic moisture value. Calorie volume in water heating increased with water volume that was constant so that water heating could control air moisture. There was a suitability in an air moisture ratio and calorie volume in water heating so that air moisture in surgery room could be measured as requirements.
PENGARUH PENAMBAHAN NIKEL TERHADAP KEKUATAN TARIK DAN KEKERASAN PADA BESI TUANG NODULAR 50 Sudarmanto, Sudarmanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 8, No 2 (2016): November
Publisher : Sekolah Tinggi Teknologi Adisutjipto

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Abstract

Nodular cast iron is the cast iron that has nodular graphite spherical structure distributed in ferrite or pearlite matrix or in both of them. Recently, this material is used widely in industries because its low cost and better performance. The advanced metal industries nowadays have found some new technologies in order to improve the properties of materials. One of them is the addition of another elements into the base metals, such as nickel. The effects of the addition 1wt %, 2wt % and 3wt % nickel into nodular cast iron 50 on tensile and hardness properties were investigated in this study. The experimental results show that the best amount of nickel that added into nodular cast iron is 3% wt, which has the best tensile and hardness properties

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