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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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NodeMcu Microcontroller Based Disinfectant Fluid Monitoring System Using Water Level Control Sensor and Ultrasonic Sensor Rama Sahtyawan; Andika Bayu Saputra; Syaeful Arief
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

The spread of the coronavirus (Covid-19) in Indonesia is increasing.Â Many innovations have begun to emerge between the use of chambersÂ that are placed on the streets is rampant, the village gate is still manually with an officer pressing the switch for incoming guests, and there is also spraying that is done automatically, reads guests who come, automatically, the obstacles encountered are sometimes run out of disinfectant fluid, demanding officers must regularly check so as not to run out. This research will develop an IoT-based disinfecting booth in addition to spraying disinfecting liquid automatically. It can also fill disinfecting liquid automatically and can be monitored via a Smartphone. System and tool requirements consist of NodeMcu Esp 8266, flow water sensor, ultrasonic sensor, Relay, Solenoid Valve, Arduino IDE, Blynk Apps, ThingSpeak The process of detecting disinfectant fluid level is divided into 2, safe level with water level between 11-50 cm, The danger level with the water level between 0-10 cm. Then the node sends an output signal to the relay. The relay continues that signal, which functions as a switch to open the solenoid, water will flow through the pipe when the solenoid valve is opened so that the water tap is open to fill the derijen. The Thingspeak IoT platform is used to display disinfectant liquid level graphs. Sensor output data will be reported in real-time to the admin via the application of the Blynk app. With the development of this device, it is expected to reduce the spread of the COVID-19 virus.

The Alternative Binary Geothermal Power-Plant Design to Utilize the Waste Heat in Lahendong Plant Eli Kumolosari; Bahrul Jalaali; Kutut Suryopratomo; Okto Dinaryanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 12, No 2 (2020): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

The first geothermal binary system in Indonesia that has successfully implemented is a 500kW binary system in Lahendong. Yet, there is still a plenty room of improvement for binary system development in Lahendong. This study aims to give an alternative design of the binary system by using an organic Rankine cycle. The investigations of thermodynamic analysis based on the law of thermodynamics, silica scaling analysis, and optimization of working fluid selection are presented. Flashing process from separator produces vapor and liquid-brine with mass flow rates 48.6 kg/s and 173.6 kg/s at separator pressure of 10.23 bar. Based on second law thermodynamics analysis, obtained the maximum useful energy from brine flow is 7.2MW. Based on the simulation results, it is achieved that the potential power generated by waste heat from the Lahendong plant is 2.46MW with the net thermal and exergy efficiency by 11% and 34%, respectively. Compared to the current operating binary system, still, much available energy needs to be harnessed in the future from the Lahendong plant.

Heterogeneous fleet green vehicle routing problem: a literature review Nur Mayke Eka Normasari; Nurul Lathifah
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 1 (2021): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Transportation, as a part of the supply chain process, contributes to carbon emission which leads to climate change and global warming. This environmental issue gives an impact to decisions regarding the supply chain of a company. One way to deal with this issue is by analyzing their vehicle routing problem. In this study, the issue about routing problems in green supply chain by considering the heterogeneous fleet is being discussed. One variant of Green Vehicle Routing Problem (GVRP) reviewed in this paper is about Heterogeneous Alternative Fuel Vehicles for Green Vehicle Routing Problem (HAFVGVRP). The purpose of this study is to review the development of GVRP with heterogeneous alternative fuel vehicles and the gap or state-of-the-art on existing researches. The review was classified according to the objectives, type of fleet, and solution used. Moreover, this study also presents the trend and direction of further research.

Pendinginan panel surya menggunakan kotak pendingin dan sirip pendingin Gunawan Rudi Cahyono; Pathur Razi Ansyah; Nuryasin Qadimil Awaly
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 1 (2021): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

An alternative energy source that can be utilized in Indonesia is solar energy, this energy is obtained from the intensity of solar radiation and then, is converted into electrical energy with solar panels technology. The performance of the solar panel is strongly influenced by the surface temperature of the panel because the semiconductor material in the panel is sensitive to temperature changes. However, the cooling process in solar panels to maintain temperature panels is important. This study combines the use of a cooling box and fins by considering fins with a very limited area. Experiments were carried out to observe natural and forced convection with or without fins in a cooling box. The results obtained that the natural convection cooling process of the panels using the cooling box and fins (without airflow) can reduce the temperature of the solar panels by 3.52%, on the other hand, by using forced convection process (with airflow), the cooling box and fins can reduce the temperature of solar panels by 3.78%. The effectiveness of fins in the case without airflow is 24.63%, but then the case of airflow cooling of solar panels is 16.63%. The addition of fins on natural convection cooling (without airflow) of solar panels causes the heat transfer area to increase, thereby increasing the rate of heat transfer between the solar panels and the air.

Pemilihan provider sand consolidation dengan metode analytical hierarchy process Rony Arjuna; Joko Waluyo; Nur Aini Masruroh
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 1 (2021): Mei
Publisher : Institut Teknologi Dirgantara Adisutjipto

Salah satu metode sand control yang umum digunakan oleh perusahaan oil dan gas untuk pekerjaan perawatan sumur adalah sand consolidation (SCON). Selama ini, proses pemilihan provider pelaksana pekerjaan dilakukan secara lelang. Kemudian pimpinan departemen dan engineer akan memutuskan providernya. Agar proses pemilihan lebih transparan, terukur dan bisa dipertanggung jawabkan, maka diperlukan suatu sistem pengambilan keputusan yang standar dan kompatibel. Penelitian ini bertujuan untuk mengetahui parameter apa yang menjadi dasar pertimbangan dan merancang sistem pengambilan keputusannya. Metode yang digunakan dalam penelitian ini adalah Analytical Hierarchy Process (AHP). Hasil dari penelitian ini menunjukkan kriteria yang dijadikan sebagai pertimbangan adalah compatibility (0,349), safety & environment (0,229), quality (0,219), cost (0,127), dan service (0,075). Alternatif ST-α2-HL dengan bobot 0,282 merupakan provider terpilih. AHP dapat diterapkan sebagai metode yang sangat baik dalam kasus penentuan best alternatif provider SCON. Perbandingan hasil antara decision maker dan metode AHP jika dilihat dari perspektif best alternatif saja mencapai 100%.

Improving employee job satisfaction in aviation industry Samto Hadi Isnanto
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Job satisfaction is an important issue in an organization. Job satisfaction has been talked about over and over again because of the importance it has in both individual and group behaviour, which will affect in the productivity of an organization. Even though the role of job satisfaction is important in an organization, it is sometimes unnoticed and ignored by the management which in turn results in a decrease of organizational work performance. This study aims to answer why job satisfaction is important and how to improve it in aviation industry. The method used in this research is a literature review by finding specific researches that corresponds to the topic discussed, which is job satisfaction, to integrate them into a concise conclusion. This research uses samples from published journals in the last 10 years (2011 – 2021) found through google scholar with the main variable job satisfaction. The result of this study shows that based on the literature reviews of different journals, job satisfaction proves to strengthen employee engagement and organizational commitment, decreases the rate of employee turnover and improves employee productivity. There are a few proven ways to increase job satisfaction in aviation industry which is creating a conducive/positive work environment, applying reward and recognition management, developing the potential skills of employees and continuous evaluation and measurement of employee job satisfaction.

Air pollution dispersion modeling of runway and apron at Sam Ratulangi international airport Dewi Eviane; Taufik Abdillah Natsir; Nur Iswanto; Zulfadly Urufi; Mardiyanto Adji
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Air pollution generated from airport activities has become public concern and the subject of more rigorous government regulations. The Airport Operators are stipulated to control the pollution and for the accountability of air quality that might affect public health. The main objective of this study is to establish a model for the distribution of air pollutants and to predict their concentrations generated by the runway and apron operations at Sam Ratulangi International Airport (Manado) until 2024, in accordance with the airport expansion program. The data was collected in the airport surrounding area in 2018, while the climate data over a span of 10 years, from 2009 to 2018, was obtained from Sam Ratulangi Meteorological Station. The modeling on dispersion of air pollutant gases was developed by the Gaussian Plume Equation. The simulation was performed using AERMOD software, and the results visualized by GIS software. AERMOD software was recommended by the US-EPA to predict the impact of air pollutants. The results predicted that the maximum concentrations of NOx; HC; and CO generated by runway activities modeling in 2024 were 250 μg.m-3; 6.4 μg.m-3; and 87 μg.m-3 respectively. The results also predicted that the maximum concentrations of NOx; CO; and PM10 due to apron operational activities in 2024 were 260 μg.m-3; 892 μg.m-3; and 2.5 μg.m-3 respectively. The model predicted that in 2024 the air pollution at Sam Ratulangi International Airport will remain under the limit as defined in Indonesian Government Regulation No. 22 of 2021. To mitigate the future increase in air emissions due to the increase in airport capacity, the recommendation were proposed in the several areas, which were including operation management, technology, policies and airport regulations, as well as the provision of green area.

Pengolahan bioarang sebagai pengganti biogas untuk mendukung proses roasting pengolahan kopi arabica dan ketahanan energi Benedictus Mardwianta; abdul haris subarjo; Dedet Hermawan Setiabudi; Munawar Husaini
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Processing of waste biochar into briquettes as a substitute for biogas to support the roasting process of Arabica coffee processing is an alternative energy innovation as a substitute for conventional charcoal derived from wood and biogas from LPG as well as to support energy security. Briquette is a material that is strongly influenced by the nature and type of the materials that make it up. This study aims to determine the effect of the composition of briquettes with a mixture of coffee husk waste and sawdust on the calorific value, moisture content, ash content, and density test. The method used is experimental. In composition III the density value is the highest because the amount of sawdust is the most. because with the treatment of the compressive force manually, the charcoal particles will experience compression in accordance with the given compressive force. The results of the research on composition I yielded a calorific value of 6052 cal/gr, composition II yielded a calorific value of 6122 cal/gr and composition III yielded a calorific value of 6333 cal/gr. The results of the ash content test of SNI 01-6235-2000 regarding charcoal briquettes, the permissible ash content does not exceed the value of 8%. The ash content produced in composition III is according to the specified standard

Simulasi aliran dua fase pada campuran air-minyak di pipa horizontal dengan parameter termal Bahrul Jalaali; Eli Kumolosari
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

A CFD study of Water-Oil flow in the horizontal pipe was conducted using the VoF multiphase model coupled with the SST turbulence model scheme. This study aimed to simulate the mixture flow characteristic by takes account temperature parameter. It was numerically solved using a finite-volume model utilized in Fluent software. The simulation results compared towards experimental showed good prediction on the particular flow pattern. In this study, the thermal parameter was then solved by utilizing energy equation coupled by multiphase model. The water flow temperatures were varied in ranged of 300-340K. The results showed that temperature affected reducing the viscosity of the fluid as well ass the density. Furthermore, the flow pattern changed whereby oil was above the water due to its viscosity and density. This study is beneficial for accessing the temperature effect on the water-oil flow as represented in the applied petroleum industry of oil-lifting.

Numerical modeling and simulation of fatigue crack growth rate due to cyclic loading on doubler structure fuselage skin station number 360-380 stringer 6L-7L Boeing 737-900 extended range aircraft Lado Rislya Prakasa; Djarot Wahju Santoso
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Untuk mengetahui kekuatan struktur doubler dalam menahan terjadinya kegagalan akibat retakan yang disebabkan oleh cyclic loading, diperlukan suatu analisis tersendiri yang tidak terdapat pada panduan Structural Repair Manual (SRM). Cyclic loading dapat mengurangi kekuatan skin doubler secara bertahap (fatigue) hingga mencapai kegagalan (fracture). Pada penelitian ini akan dilakukan analisis crack growth rate dan jumlah siklus pembebanan yang dibutuhkan untuk memunculkan retakan dengan panjang tertentu (fatigue cycle) terhadap struktur doubler fuselage skin pesawat Boeing 737-900 Extended Range dengan station number 360-380 di antara stringer 6L-7L pada setiap panjang retakan dan ketinggian terbang simulasi. Analisis dilakukan menggunakan pendekatan numerik dengan metode Modified Virtual Crack Closure Integral (MVCCI) untuk mendapatkan nilai Stress Intensity Factor (SIF) melalui software berbasis metode elemen hingga. Melalui nilai yang diperoleh dapat diketahui bahwa nilai crack growth rate dan fatigue cycle berbanding lurus terhadap variasi panjang retakan dan ketinggian terbang simulasi yang diberikan. Nilai crack growth rate paling rendah terjadi pada struktur doubler dengan panjang retakan 8,5 mm dan kondisi terbang 5000 feet yaitu sebesar 2,964 mm/cycle, dan nilai tertinggi sebesar 5,471 mm/cycle terjadi pada struktur doubler dengan panjang retakan 51 mm dan kondisi terbang 40000 feet. Sedangkan, nilai fatigue cycle paling rendah terjadi pada struktur doubler dengan panjang retakan 8,5 mm dan kondisi terbang 40000 feet yaitu sebesar 2,540 cycle, dan nilai tertinggi sebesar 5,470 cycle terjadi pada struktur doubler dengan panjang retakan 51 mm dan kondisi terbang 5000 feet.

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