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All Journal PROSIDING SEMINAR NASIONAL Dental Journal (Majalah Kedokteran Gigi) Journal of Geoscience, Engineering, Environment, and Technology Conference SENATIK STT Adisutjipto Yogyakarta Angkasa: Jurnal Ilmiah Bidang Teknologi Jurnal Pengabdian Masyarakat Sains Indonesia (Indonesian Journal Of Science Community Services) Jurnal Teknologi dan Riset Terapan (JATRA) Edu Sociata : Jurnal Pendidikan Sosiologi Vortex International Journal of Innovation in Mechanical Engineering and Advanced Materials Jurnal Manajemen dan Teknologi Rekayasa Khidmat : Jurnal Pendidikan dan Ilmu Sosial International Journal of Economics, Business and Innovation Research
Agung Prakoso
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Religion Aerospace Engineering Automotive Engineering Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences

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Journal : Vortex

 1 
EXPERIMENTAL STUDY OF COOLING SPRAY METHOD ONTO INCLINED HEATED SURFACES Wibowo, Teguh; Hermawan, Dedet; Prakoso, Agung
Vortex Vol 3, No 1 (2022)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (905.501 KB) | DOI: 10.28989/vortex.v3i1.1164

Abstract

Single droplet impingement onto inclined heated surface is studied experimentally. Droplet in the form of aquades is dropped from a fixed height 70 mm to the metal surface with 45º impact angle. This experiment uses 3 types of metals; Stainless Steel AISI 304, Aluminum Alloy 2024, and Copper. All material surfaces are mirror polished and assumed to have the same surface treatment condition. Surface temperatures are 110 ºC, 150 ºC and 210 ºC to determine droplet behavior characteristics. The droplet has 3.0 mm diameter and 28.5 Weber Number (low impact category). In order to analyze droplet behavior in slow motion high velocity camera 4000 fps (frames per second) is used with image resolution 1024 x 768. Data obtained then processed using MATLAB image processing technique to analyze sequence of images visually and quantitatively to determine several parameters; spreading ratio, dimensionless height and contact time.The results showed droplets have different behavior characteristics even at the same surface temperature. Droplet contact time on the copper surface is shorter than aluminum and stainless steel. This is because droplets experienced bouncing due to film boiling regime takes place earlier. Maximum spreading ratio of stainless-steel surfaces is higher than copper because changes of boiling regime on stainless steel surfaces are slower and droplet is still experiencing spreading on the surface
Penanganan Vibration Propeller menggunakan Metode Fault Tree Analysis pesawat KT-IB Woong Bee Kurniawan, Riski; Pamungkas, Sunu Aditya; Prakoso, Agung; Lukito, Indro; Budiono, Cyrilus Sukaca; Soemarwoto, Wahyudi
Vortex Vol 5, No 2 (2024)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v5i2.2418

Abstract

Propeller yang diputar oleh engine dapat menghasilkan gaya dorong, karena bentuk blade propeller sendiri yang menyerupai airfoil pada wing pesawat jika dilihat dari penampangnya. Pada pesawat KT-1B Woong Bee, propeller yang digunakan adalah HC-E4N-2/E9512CB-1, jenis adjustable pitch dengan 4 blade. Agar propeller berfungsi optimal, putaran harus stabil untuk memastikan gaya dorong dan kenyamanan penerbangan. Vibration pada propeller sering disebabkan oleh ketidakseimbangan blade, yang bisa terjadi akibat perbedaan berat blade atau perbedaan angle of attack. Analisis kegagalan vibration propeller dilakukan dengan observasi dan data kegagalan dari pesawat KT-1B Woong Bee dalam tiga tahun terakhir (2021-2023). Data tersebut dianalisis menggunakan metode Fault Tree Analysis (FTA) untuk menemukan basic event vibration yang kemudian dianalisa kembali untuk menentukan modus kegagalan yang berupa different weight pada blade yang kemudian dilakukan penanganan berupa balancing propeller, yang mencakup penambahan beban pada blade untuk menyeimbangkan berat blade propeller.
Analysis of the Increase in Payload Capacity of Airbus A320 Aircraft at Radin Inten II International Airport Lampung Using an Improved Climb Approach Lukito, Indro; Budiono, Cyrilus Sukaca; Prakoso, Agung; Poerwanto, Eko; Mardwianta, Benedictus
Vortex Vol 6, No 1 (2025)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v6i1.2802

Abstract

This study aims to analyze the increase in the payload capacity of the Airbus A320 at Radin Inten II International Airport Lampung using the Improve Climb approach. The Improve Climb approach focuses on optimizing the aircraft's climb path to enhance efficiency and payload capacity, particularly in airport conditions with high elevation and unfavorable weather. This study includes an analysis of the performance data of the Airbus A320. In addition, flight simulations were conducted taking into account factors such as wind speed, air temperature, and engine power. The results of this analysis are expected to provide recommendations regarding the optimization of flight schedules, passenger capacity, and improvements in operational efficiency at the airport. The results of the study indicate that by applying the Improve Climb approach, the aircraft's payload capacity can be increased by up to 3% without compromising safety. This opens up opportunities to increase the number of passengers.
Optimization of Turn Around Time Calculation for C05-Check Aircraft Maintenance Using Critical Path Method (CPM) On Boeing 737-900er Aircraft Islami, Alfi Daffa; Rahmawati, Fajar Khanif; Mulyani, Sri; Prakoso, Agung; Hartini, Dwi; Prattiwi, Elisabeth Anna
Vortex Vol 6, No 2 (2025)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v6i2.3644

Abstract

Boeing 737-900 ER maintenance in Indonesia emphasizes timely, efficient routines to minimize risks. Using the Critical Path Method (CPM), the analysis calculates the Turn Around Time (TAT) for C05-Check maintenance. The CPM results estimate a TAT of 20.47 days (rounded to 20 days), while the company's data shows 21.73 days (rounded to 22 days), indicating a 2-day difference. This discrepancy highlights potential areas for improving maintenance efficiency. The TAT efficiency for the maintenance process is calculated at 0.057%. Optimizing mechanic workload based on this analysis can enhance turnaround times and ensure aircraft safety and operational scheduling. Accurate TAT predictions are vital for balancing maintenance quality with airline efficiency, making CPM a valuable tool in operational planning and resource allocation. Continued comparison with company data ensures maintenance practices remain precise, reducing unexpected delays and maintaining flight safety standards.
The Impact of Compressor Wash Maintenance on the Rolls Royce M250-B17F Engine Performance of Grob G 120TP-A Aircraft Prakoso, Agung; Lukito, Indro; Junaidin, Buyung; Wibowo, Teguh; Budiono, Cyrilus Sukaca
Vortex Vol 7, No 1 (2026)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v7i1.3817

Abstract

The Grob G 120TP-A is a training aircraft powered by the Rolls Royce M250-B17F engine with limited aerobatic capabilities. To optimize its flight performance, maintenance procedures such as compressor wash are essential. Compressor washing is conducted periodically every 100 flight hours to clean the compressor blades from contaminants caused by humidity and salt particles. This study used thermodynamic analysis to evaluate the increase in thrust power and effective power after compressor washing at different Outside Air Temperatures (OAT). The results indicate that after compressor washing, the thrust power increased by 4.3% and the effective power increased by 0.3%, demonstrating the importance of routine maintenance in sustaining optimal engine and aircraft performance.
Co-Authors Ahmad Najib Alni, Azzahra Dwi Amrullah, Fauzan Andinusa Rahmandhika Anjani, Wenda Latifah Arif Pambekti Bambang Sudibya, Bambang Benedictus Mardwianta, Benedictus Budiono, Cyrilus Sukaca Buyung Junaidin, Buyung Denny Dermawan Dwi Hartini Dwideta, Vezi Adina Eko Poerwanto Elita Rafni, Elita Elvaria, Anna Fachry Abda El Rahman Farchan Mauluddin Fery Agusman MM Hadi, Farhan Henny Pratiwi, Henny Hermawan, Dedet Indrayani Islami, Alfi Daffa Kudus, Wahid Abdul Lukito, Indro Maulana Agung Mirza, Akhmad Mizan, Fathkul Okto Dinaryanto Pamungkas, Sunu Aditya Prattiwi, Elisabeth Anna Prima, Wahyu Rahmawati, Fajar Khanif Riski Kurniawan Rita Endriani Rizqi ilmal yaqin, Rizqi ilmal Saputra, Rahmad Hidayat Setyo, Bima Candra Gautama Adi Soemarwoto, Wahyudi Sonhaji - Sri Mulyani Teguh Wibowo Tesniyadi, Dema Tri Wahyudi, Makus Wahju Santoso, Djarot