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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 8 Documents

Search results for , issue "Vol 13, No 2 (2021): November" : 8 Documents clear

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.

Aplikasi ngresiki untuk pelaporan penumpukan sampah memanfaatkan Global Positioning System (GPS) dan firebase Astika Ayuningtyas; Asih Pujiastuti; Anggraini Kusumaningrum; Nurcahyani Dewi Retnowati; Gabriel Naka Sorateleng
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Increasing human productivity accompanied by increasingly advanced developments has an impact on the need for faster and easier communication and data exchange, one of which is using a mobile smartphone. ReResik application is an application that is used to report the accumulation of garbage. Garbage accumulation is a problem that is often encountered, one of which is in Gunungkidul tourism objects, so there needs to be a solution to solve this problem. One solution is to utilize Global Positioning System (GPS) and Firebase technology to create a waste reporting application. The use of GPS can make it easier to report the accumulation of garbage in a place by utilizing geo tagging technology and the complexity of the features found in Firebase provide user convenience both in terms of application development and the use of features in applications that can facilitate reporting and recipients of waste reports. All functions in the ReResik Application run according to design. Tests in the field can show the location of the accumulation of waste with photos sent with the difference in the accuracy of the location where the report of accumulation of waste occurs 1.38 meters from the location point sent by the application. The average data transfer capability of the ReResik Application upload is 1161.8 ms for the reporting section and 1004.2 ms for the cleaning staff. Functional testing of photos uploaded to Firebase has gone through the process of automatically compressing photos with an average value percentage of 61.22% of the uploaded photo size.

Desain sensor massa resonator MEMS menggunakan struktur free-free beam Wangi Pandan Sari
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

MEMS is an integrated electro-mechanical device which the technology has been applied to various applications, one of which is for the fabrication of microsensors, such accelerometers, microsensors for flow sensing, pressure sensing and mass sensing. In the MEMS implementation, there are several approaches and structures that can be used. This study designed a MEMS resonator mass sensor by the means of a mechanical resonator approach with free-free beam structure and actuated electrostatically. The design is expected to produce a MEMS based mass sensor with a high performance.

Tipe fluida hidrotermal sepanjang manifestasi panas bumi di daerah Ungaran dan sekitarnya Paramitha Tedja Trisnaning; Fatimah Fatimah
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 13, No 2 (2021): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Bagian timur–selatan kaki Gunung Ungaran, Jawa Tengah dikenal sebagai daerah prospek panasbumi dengan manifestasi panasbumi matair hangat – panas. Masyarakat maupun pemerintah setempat, memanfaatkan manifestasi tersebut sebagai area wisata ataupun pemandian/kolam air panas yang dapat dijumpai di area wisata Candi Gedongsongo, Diwak, Derekan, Kaliulo, dan Banaran. Manifestasi matair panas muncul di permukaan dengan suhu dan karakteristik yang berbeda. Hal ini dimungkinkan karena adanya perbedaan tipe fluida hidrotermal, sehingga menarik dilakukan penentuan tipe fluida hidrotermal berdasarkan kandungan anionnya—Cl-, SO42-, dan HCO3-. Fluida hidrotermal muncul di permukaan sebagai air alkali klorida, air asam sulfat, air asam sulfat–klorida, dan air bikarbonat. Hasil analisis konsentrasi anion pada ke-lima lokasi, menunjukkan konsentrasi Cl- tertinggi ± 4.475 ppm dijumpai pada matair panas Diwak dengan konsentrasi HCO3- 127 – 500 ppm dan SO42- relatif rendah. Tipe fluida hidrotermal mataair panas Gedongsongo, Derekan, Kaliulo, dan mataair Banaran berupa Air Bikarbonat, serta mataair panas Diwak berupa Air Klorida.

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