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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

Arjuna Subject : -

Articles 350 Documents

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Dynamical Characteristics Of A Head Expander For Vibration Testing In Pustekbang Laboratory Nur Mufidatul Ula; Yusuf Giri Wijaya; Muksin Muksin; Mikhael Gilang Pribadi Putra Pratama; Agus Harno Nurdin Syah
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Vibration testing of the head expander has been carried out. This test aims to determine the dynamic characteristics of the head expander that used in the Laboratory of Temperature and Vibration Testing, The Aeronautics Technology-LAPAN. The Head expander is used as a testing tool for the needs of large specimens. Validation of the head expander through this experimental method aims to determine the level of homogeneity of the head expanders. Retrieval of data using 4 accelerometers that are placed at each end of the head expanders. Sine sweep vibrations are given from 5 Hz to 2000 Hz with a constant amplitude of 1g and a sweep rate of 1 octave/minute. The test results show that the ends of the head expander have homogeneous properties with natural frequency values that do not differ much. Resonance occurs at a frequency of 900 Hz, 1300 Hz, 1600 Hz and 1900 Hz. The largest amplitude value at 11,76 g occurs at a frequency of 1900 Hz, so this head expander cannot be used for tests above 1900 Hz.

Airspace Capacity Analysis of Adisutjipto Airport Aprinia Kusumaningsih; Dewanti Dewanti; Imam Muthohar
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Flight operation delays occur if there are delays both on the ground and in the airspace. It happened while the demand for air traffic exceeded the available capacity. The aim of the study is to analyse the airspace capacity based on Air Traffic Controllerâ€™s workload to support safety, expeditious, and orderly flow of air traffic which are the responsibility of the ATC. Primary data in this analysis were obtained by observing the activities conducted by ATC when delivering services to the airspace sector for 1 hour during peak hours within 30 days. The secondary detailed used to help the study relate to the amount of flight during peak hours, weather conditions, and flight plans. The analytical method used to determine the airspace capacity shall be the Pessimistic Sector Capacity. The result indicated a theoretical capacity of 31 aircraft per hour and practical capacity of 25 aircraft per hour with ATC personnel working time of 33 minutes being included in the heavy load category.

STOCHASTIC DEMAND IN VEHICLE ROUTING PROBLEM WITH COMPARTMEN Nur Mayke Eka Normasari; Anjas Fikhri Warangga; Widyasari Her Nugrahandika
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 11, No 2 (2019): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

This research focus on consideration of stochastic demand in deterministic Vehicle Routing Problem with Compartment (VRPC) model. VRPC in this research consider split delivery, multi product, and time windows characteristic. Stochastic demand in this research is handled using scenario-based approach. The demand is modeled by constructing discrete scenarios then implementing it in the deterministic VRPC model. The change of customer demand over time is considered as normal probability distribution. Stochastic VRPC model then solved using robust approach by looking for the highest demand under each scenario to be solve, therefore the solution generated deals with the minimum probability of unmet demand.

Analisis pengaruh refiner time terhadap quality tissue (studi kasus di PT Pindo Deli Pulp and Paper Mills 2) Dewi Sinta; Fahriza Nurul Azizah; Billy Nugraha
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 1 (2021): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Penelitian ini bertujuan untuk mengetahui pengaruh dari refiner time (waktu penggilingan ulang) terhadap kualitas tissue.Data yang dikumpulkan adalah data primer saat proses pembuatan tissue (handsheet).Waktu untuk LBKP (5, 10 dan 25) menit dan NBKP (10, 30 dan 40) menit. Masing-masing pulp dibuat sebanyak 2 buah. Kemudian dilakukan pengujian di Laboratorium QC dengan faktor pengujian yang menentukan kualitas tissue. Seperti:freeness(derajat giling), thickness(ketebalan), machine direction tensile(kekuatan), basisweight (berat), elongation (daya mulur) dan porosity(kerapatan serat). Hasil yang didapat jika semakin lama refiner time,maka (1) freeness akan semakin rendah, (2) thickness akan semakin tinggi, (3) measure direction tensile akan semakin tinggi, (4)elongation akan semakin tinggi dan (5) porosity akan semakin tinggi. Namun tidak akan memengaruhi nilai dari basis weight.

Hydrogeology Potential of Hargorejo Area Kokap Subdistrict West Progo Regency T. Listyani R.A.; Dianto Isnawan; Ign. Adi Prabowo
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

This research is a hydrogeological survey activity with the aim to determine the geological characteristics of groundwater in the Hargorejo area, Kokap Sub-district, West Progo. The study wants to know about the pattern of groundwater flow and water quality in the area. The northern part of the research area is included in the non-groundwater basin region of the West Progo Dome, while the southern part is included in Wates Groundwater Basin. Method of research is a field hydrogeological survey, to obtain geological and groundwater data. Groundwater flow pattern and quality analyses are based on groundwater data and pH, TDS and EC values. Groundwater can be obtained from springs or dug wells, with relatively shallow groundwater tables. The pattern of groundwater flow is generally to the south, with the H4 / H5 basin boundary type. Groundwater quality is quite good, with a pH value of 6.2 -7; TDS 191 - 558 ppm, and EC ranges from 279-783 ÂµS / cm.

Influence of Biomass Based Carbon Black as Filler Composite on Tensile and Impact Strength Nurfi Ahmadi; Fajar Nugroho
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Carbon blacks (CB), derived from agricultural waste, bamboo stem, coconut shellsÂ and oil palm empty fiber bunch, were obtained by pyrolysi used as filler in epoxy composites. The aim of this study was to identify the effect of biomass based carbon black on the tensile and impact strengthÂ carbon black â€“ epoxy composite. In this research, carbon black was biomass based. The matrix was epoxy resin Bakelite EPR 174 and epoxy hardener versamid 140 while, the methodology for making the composite was hand lay-up method. The composite were made at 5, 10, 15, 20 volume percentageÂ carbon black then the composite tested with the tensile and impact strength. The highest tensile strength was 44,65 MPa 5 volume percentageÂ carbon black and the highest impact strength was 5.47 MPa volume percentageÂ carbon black. While, based on the result of Scanning Electron Microscope (SEM) analysis showed there were agglomeration at the particle of carbon black, pull out, and void.

COMBINATION OF CRYPTOGRAPHIC ALGORITHM AND STEGANOGRAPHY TO HIDDEN MESSAGE IN IMAGE Yuliana Yuliana; I Wayan Pandu Swardiana; Dony Ariyus
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 11, No 2 (2019): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Along with the increasing use of the internet in Indonesia, the threat to messages in image media has increased. The confidential data that will be sent requires security so that it can be read by the recipient of the message. For this reason, it is necessary to design a security system for this picture's media message by encrypting and decrypting it then then hiding the message. The algorithm used by combining various cryptographic algorithms and steganography techniques using the LSB method. The test results show the security of the message on the image media, especially in protecting the copyright rights of the image. The original original image measuring 242 kb in the .jpg format will increase in value after adding secret data with a size of 536 kb using the .png format. This system successfully displays secret messages in the image and does not change the cover of the image.

Development and analysis of 2D flight planning search engine considering fusion of swim data Michael Hius Sentoso; Neno Ruseno
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 1 (2021): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Flight planning is one of the essential factors of the airline operation. The selection of routes will determine the economic value of the flight. However, some conditions may prevent the flight to use the most optimum route due to airspace restriction or weather condition. The research aims to develop a search engine program that uses dynamic flight parameters that considers fusion of System Wide Information Management (SWIM) data including weather data and NOTAM to produce the most optimum route in 2D flight planning. The Dijkstra’s pathfinding is implemented in Python programming language to produce the flight plan. The navigation data used is enroute airway in Indonesian FIR regions. The scenario used is a flight from Jakarta to Makassar with duration of 2 hours flight with considering the effect of restricted airspace and weather blockage during in-flight. The study also uses the optimum route produced by the algorithm to be compared with the possible alternate routes to define how optimum the route is. Adding a restricted airspace parameter will result in a new optimum flight plan that able avoids the airspace and the most minimum distance. The effect of external wind parameter could influence the optimum route which may vary depends on the speed of the wind.

THE ANALYSIS OF COMPARISON RESULTS USING EROSION AND OPENING ON THE PIAS CARD SEGMENTATION PROCESS (CASE STUDY: ST. BARONGAN) Asih Pujiastuti
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 11, No 1 (2019): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

This research was conducted to improve the application used in the calculation of the sunshine duration. The research that has been done using the opening method for segmentation of the pias card. The error or failure of segmentation is caused by a small burning object of the pias card and or a thin but translucent object, so that the object is partially lost or forms an object's separation area. Based on the error or failure of segmentation in the above research, the research will be done is to develop similar applications by replacing one of the methods with erosion morphology. The test was carried out with 92 data and the results stated that Erosion with Radius = 3 became the best alternative method in this research with RMSE 3.14.

Strength Analysis on Airplane Fuselage Structure Stringer Dwi Hartini
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Fuselage is an airplane main body structure designed for accommodating the crew, passengers, and cargo. The fuselage of a modern aircraft is a semi-monocoque construction. Semi-monocoque structure is very efficient, it has a high strength to weight ratio, and it has design flexibility and can withstand local failure without total failure through load redistribution. One of the loading on fuselage is cabin pressure. In continuous operation airplane due to cabin pressure, damage often occur in the fuselage, for example on the stringer. Type of repair to deal with cases of damage to stringer needs to be analyzed. This study aims to determine the effect of angle thickness and fastener variations on the strength of repair stringer structure. The analysis stage by 3D modeling with CATIA software. Simulation of structural analysis in the form stress and calculating the Margin of Safety. Â The thicker of angle and the more number of fasteners in the web area and the flange used in the repair, the stress that occurs in each variation will decrease. Modeling the structure is safe against pressure loading.

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