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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 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 Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Analisa kegagalan sistem beta pesawat Grob G 120TP-A dengan menggunakan metode Mean Time Between Failure Prakoso, Agung; Setyo, Bima Candra Gautama Adi; Dermawan, Denny; Budiono, Cyrilus Sukaca; Lukito, Indro; Kurniawan, Riski
JUMANTARA: Jurnal Manajemen dan Teknologi Rekayasa Vol 3, No 2 (2024): Juli
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/jumantara.v3i2.2378

Abstract

Pesawat Grob G 120TP-A merupakan jenis pesawat latih dengan engine single turbo propeller. Dalam kinerja engine pesawat Grob G 120TP-A tersebut memiliki komponen yang dinamakan sistem beta untuk mengubah sudut riverse pada propeller dan menghasilkan gaya drag. Rata-rata kegagalan sistem beta banyak terjadi sebelum mecapai usia 3000 jam terbang. Berdasarkan hal tersebut dilakukan observasi kegagalan sistem beta pesawat Grob G 120TP-A dalam kurun waktu tahun 2016-2023, kemudian dilakukan analisis dengan Mean Time Between Failure (MTBF) dan dibandingkan dengan nilai probabilitas yang didapatkan dari pengalokasian Fault Tree Analysis (FTA). Hasil dari nilai mean time between failure paling tinggi pada sistem beta adalah terjadinya kegagalan N2 Fluctuate yang bernilai 961 cycle dan pesawat dengan nilai paling tinggi adalah pada pesawat LD 1201 dengan nilai 157 cycle, selanjutnya dibandingkan dengan probabilitas faul tree, maka kegagalan pada sistem beta dari total keseluruhan yang tidak bisa diterima hanya pada kegagalan vibration dan N2 fluctuate.
Effect of Pouring Temperature Variation on Cooling Rate, Hardness and Microstructure of Al-Zn in Aircraft Structures Pambekti, Arif; Prakoso, Agung; Dinaryanto, Okto; Rahmandhika, Andinusa; Yaqin, Rizqi Ilmal
International Journal of Innovation in Mechanical Engineering and Advanced Materials Vol 6, No 1 (2024)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijimeam.v6i1.23945

Abstract

Al-Zn alloys are widely utilized in industries such as automotive, aircraft manufacturing, and advanced military equipment due to their exceptional strength-to-weight ratio. Among various fabrication methods, metal casting is a commonly used technique for producing structural components from these alloys. However, a significant challenge with metal casting is the reduction in mechanical properties compared to the base material before melting. This reduction highlights the need for research to identify the optimal casting conditions, particularly the casting temperature, which plays a crucial role in maintaining and potentially enhancing the material's mechanical properties. Aluminum alloy 7075, known for its high strength, was selected for investigation. According to the Al-Zn phase diagram, the melting point of aluminum alloy 7075, based on the weight percentage specified by the Standard Aluminum Association, is approximately 660°C. Experiments were conducted by varying the pouring temperature during casting in 30°C increments above this melting point. Specifically, the alloy was melted and cast at three different temperatures: 690°C, 720°C, and 750°C. The mold temperature was consistently maintained at 220°C to isolate the effects of the pouring temperature. Results indicate that increasing the casting temperature significantly affects the alloy's microstructure and mechanical properties. As the casting temperature increases, the cooling rate decreases, leading to a finer grain structure. This finer grain size directly contributes to an increase in hardness, suggesting that higher casting temperatures can enhance the mechanical properties of Al-Zn alloys. These findings emphasize the importance of precise control over casting temperatures to optimize the performance characteristics of aluminum alloy 7075 in high-strength applications.
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.
Community Based Inundation and Flood Mitigation in Palembang City, Indonesia Indrayani; Saputra, Rahmad Hidayat; Elvaria, Anna; Mirza, Akhmad; Najib, Ahmad; Prakoso, Agung; Anjani, Wenda Latifah
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.18139

Abstract

The increasing intensity of rainfall in Palembang City has heightened the risk of hydrometeorological disasters, particularly flooding and inundation. Despite various efforts by the municipal government to mitigate these events, flooding continues to occur following episodes of high or prolonged moderate rainfall. This study analyzes flood mitigation strategies with focus on community participation in addressing recurring inundation. Data from a flood distribution map reveal 196 flood points across the city, with flood heights ranging from 20 to 50 cm, occurring on average 10-15 times annually and typically receding within 2 to 4 hours though longer durations are observed in several sub-districts. Surveys and interviews conducted in 18 sub-districts identified key contributing factors, including drainage obstruction due to waste, sedimentation, vegetation, unauthorized construction, limited catchment areas, and inadequate drainage connectivity. Additional challenges include diminished retention pond capacity caused by vegetation overgrowth, functional conversion, embankment erosion, and topographical disadvantages such as low-lying terrain. The study proposes the optimization and restoration of drainage infrastructure, community empowerment in catchment area management, and the installation of additional pumps and automated sluice gates as integrated solutions. These measures aim to enhance water flow and reduce the frequency and impact of flooding in Palembang City.
Co-Authors Ahmad Najib Alni, Azzahra Dwi Amrullah, Fauzan Andinusa Rahmandhika Anjani, Wenda Latifah Arif Pambekti Budiono, Cyrilus Sukaca Denny Dermawan Dwideta, Vezi Adina Elita Rafni, Elita Elvaria, Anna Fachry Abda El Rahman Farchan Mauluddin Fery Agusman MM Hadi, Farhan Henny Pratiwi, Henny Hermawan, Dedet Indrayani Kudus, Wahid Abdul Lukito, Indro Maulana Agung Mirza, Akhmad Mizan, Fathkul Okto Dinaryanto Pamungkas, Sunu Aditya Prima, Wahyu Riski Kurniawan Rita Endriani Rizqi ilmal yaqin, Rizqi ilmal Saputra, Rahmad Hidayat Setyo, Bima Candra Gautama Adi Soemarwoto, Wahyudi Sonhaji - Teguh Wibowo Tesniyadi, Dema