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All Journal Angkasa: Jurnal Ilmiah Bidang Teknologi Al-Fath Ideguru: Jurnal Karya Ilmiah Guru Vortex Asketik: Jurnal Agama dan Perubahan Sosial Mestaka: Jurnal Pengabdian Kepada Masyarakat Tasyri' Risalah Iqtisadiyah: Journal of Sharia Economics

Dwi Hartini

Institut Teknologi Dirgantara Adisutjipto

Author-ID : 3750869

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Other

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Pengaruh Mode Pembebanan Mekanika Retakan Terhadap Fatigue Crack Growth Rate Pada Struktur Doubler Fuselage Skin Pesawat Boeing 737-900ER Seran Luan, Randi Edward; Hartini, Dwi; Wibowo, Teguh; Prattiwi, Elisabeth Anna; Santoso, Djarot Wahju
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.v6i1.2729

Instalasi doubler dinyatakan aman di bawah Structural Repair Manual (SRM). Namun kemampuan menahan beban siklik tidak disebutkan secara eksplisit dalam SRM. Pembebanan siklik dapat menyebabkan kegagalan yang berhubungan dengan kelelahan. Penelitian ini didasarkan pada asumsi mekanika retak mode pembebanan II, dan analisis laju pertumbuhan retak dan siklus kelelahan dilakukan dengan menggunakan metode numerik MVCCI. Hasil penelitian menunjukkan bahwa nilai laju pertumbuhan retakan terendah adalah panjang retakan 8,5 mm pada kondisi terbang 5000 ft, yaitu 5,045×10-14 mm/siklus, dan nilai tertinggi adalah panjang retakan 51 mm. Pada kondisi penerbangan 40.000 kaki, ini akan menjadi 1,762×10-10 mm/siklus.

STRENGTH ANALYSIS OF CARGO-X UAV WING STRUCTURE USING SANDWICH COMPOSITE MATERIALS Hartini, Dwi; Junaidin, Buyung; Habibi, Habibi
Vortex Vol 3, No 1 (2022)
Publisher : Institut Teknologi Dirgantara Adisutjipto

The Cargo-X UAV aircraft is a UAV aircraft designed to carry medicines, packages and blood bags in areas that require fast and efficient handling. One of the important components of the Cargo-X UAV aircraft is the wing, so the strength of the wing structure must be seriously considered to ensure safety during flight under unexpected conditions. The purpose of this study was to analyze the wing structure of the UAV Cargo-X aircraft made of sandwich composite material to determine the level of safety of the wing structure. The loading of the wing structure uses the load due to the lift. The wing structure modeling uses CATIA software, while the analysis uses PATRAN/NASTRAN software. From the analysis results, the skin and spar wing structures are safe against loading, while the core section is not safe against loading.

TENSILE STRENGTH ANALYSIS OF SEA PANDAN LEAVES (PANDANUS TECTORIUS) FIBER REINFORCED EPOXY COMPOSITE Hartini, Dwi; Pinandita, Lazuardy Rahendra; Mubarak, Pramuda Naufal
Vortex Vol 3, No 2 (2022)
Publisher : Institut Teknologi Dirgantara Adisutjipto

The use of sea pandan leaves (pandanus tectorius) as a composite material is intended to reduce the use of synthetic fibers and increase the use of sea pandan leaves which are still wasted. This study aims to determine the tensile strength of the fiber composite of sea pandan leaves based on the manufacturing method and the direction of the fiber used. Composite manufacture using Hand Lay Up and Vacuum Bag methods. The direction of the fiber used is 00 and 900. Tensile test is based on ASTM D3039. The results showed that the composites made using the Vacuum Bag method had a higher tensile strength than the composites made using the Hand Lay Up method, which was 16.54 MPa for the 00 fiber direction and 13.60 MPa for the 900 fiber direction. The tensile strength of the composite using the 00 fiber direction is higher than the composite using the 900 fiber direction, which is 6.48 MPa for the Hand Lay Up method and 16.54 MPa for the Vacuum Bag method.

Troubleshooting pada Air Conditioning Recirculation System di komponen fan pesawat Boeing 737-900ER Azhar, Azwari; Hartini, Dwi; Edi, Prasetyo
Vortex Vol 5, No 1 (2024)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v5i1.2029

Sistem resirkulasi AC merupakan sub sistem pada sistem pendingin udara yang berfungsi untuk mensirkulasikan dan menyaring 50% udara yang ada di dalam kabin sehingga penumpang terhindar dari berbagai macam polusi, virus, bakteri dan debu yang dapat memicu iritasi pada manusia seperti seperti hidung tersumbat, mata berair, dan pilek. Berdasarkan hasil data kerusakan yang penulis ambil pada maskapai XYZ pada tahun 2016 – 2019, kerusakan pada sistem resirkulasi AC pada komponen kipas angin cukup tinggi dengan kerusakan sebesar 21 kali lipat. Dimana damage yang paling dominan adalah kipas pop out sebanyak 5 kali dan kipas tidak berfungsi sebanyak 4 kali. Tahap penelitian ini diawali dengan penentuan komponen kritis menggunakan metode analisis kekritisan dengan menghitung empat kriteria dimana terdapat frekuensi kerusakan yang tinggi, dampak kerusakan pada sub perakitan, sulitnya pelepasan dan pemasangan serta harga yang mahal dan analisis ABC. , lalu menentukan nilai TTF dan TTR komponen. Setelah itu identifikasi kerusakan yang sering terjadi pada komponen kritis sistem resirkulasi AC. Berdasarkan hasil pengolahan data yang telah dilakukan, komponen yang paling kritis adalah komponen kipas angin dengan nilai nilai 32. Selanjutnya berdasarkan hasil identifikasi kerusakan terdapat 9 jenis kerusakan yang sering terjadi pada komponen kipas yaitu pop out, aliran rendah, kondisi buruk, motor rusak, berisik, tidak berfungsi, putaran tidak stabil, tidak berputar dan lemah. Dimana damage yang paling dominan adalah kipas pop out sebanyak 5 kali dan kipas tidak berfungsi sebanyak 4 kali.

ANALISIS BENDING PADA KOMPOSIT SERAT ALAM DAUN AGEL DENGAN RESIN EPOXY Sahuburua, Stevward Norenssio; Hartini, Dwi; Adiputra, Bangga Dirgantara
Vortex Vol 4, No 2 (2023)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v4i2.1696

The use of composite materials, especially those developed by natural fibers in various equipment, has begun to develop a lot, the use of natural agel leaf fibers as composite materials can reduce the use of synthetic materials and increase the utilization of agel leaf natural fibers which are still a lot of wasted. This study aims to determine the stages or processes of agel leaf natural fiber composite using 2 methods of hand lay up, vacuum bag and to determine the value of the bending strength of agel leaf natural fiber material between variations of the epoxy matrix in the direction of the fibers 0^° and 〖90〗^°.Based on the data from the test results, it can be concluded that the average value of maximum bending strength in agel leaf natural fiber composites using the vacuum bag manufacturing method with a volume fraction of 60% and fiber direction 0^° and 〖90〗^° has an average maximum bending strength value that is the highest, namely 11.006 MPa and 11.057 MPa and the composite of agel leaf natural fiber using the hand lay up method (non vacuum bag) with a volume fraction of 50%, 60%, 70% and fiber direction 0^° has the lowest average maximum bending strength values of 3.413 MPa, 5.404 MPa, 4.625 MPa.

Karakterisasi sifat bending komposit hibrid serat alam daun nanas dan serat bambu untuk aplikasi struktur UAV Pangkey, Calvin Delano Immanuel; Hartini, Dwi; Adiputra, Bangga Dirgantara
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.v5i2.2510

Pengembangan teknologi ramah lingkungan sedang banyak mendapatkan perhatian dari berbagai bidang. Salah satunya ialah pemanfaatan serat alam dalam pembuatan bahan komposit. Pemanfaatan serat daun nanas dan serat bambu sebagai bahan penguat komposit dapat menjadi alternatif bahan penguat sintetis yang banyak digunakan. Penelitian ini berfokus pada pengujian bending untuk mengetahui kekuatan bending dari komposit hybrid serat alam daun nanas dan serat bambu. Pembuatan komposit hybrid serat alam daun nanas dan serat bambu menggunakan metode hand lay-up, dengan orientasi serat 0ᵒ, resin Epoxy, dan fraksi volume 50%, 60%, dan 70%. Hasil pengujian bending menunjukkan kekuatan bending maksimum tertinggi didapatkan pada fraksi volume 50%, dengan nilai kekuatan bending sebesar 86,116 MPa. Sedangkan kekuatan bending maksimum terendah diperoleh pada fraksi volume 60% yaitu sebesar 49,653 MPa. Fraksi volume 70% berada ditengah-tengah dengan nilai kekuatan bending maksimum sebesar 68,115 MPa.

BUCKLING ANALYSIS OF ISOTROPIC PLATES (AL 2024-T3) AND QUASI-ISOTROPIC PLATES (CARBON/EPOXY T300/5208) Hartini, Dwi; Noviyanto F, Hendrix; Arifqi M, Muh. Nadlah; E.Nasution, M.Ridlo
Vortex Vol 4, No 1 (2023)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/vortex.v4i1.1446

Buckling is a condition where an object is bent due to the application of a compression (compressive) load on the object. Buckling often occurs in thin-walled structures such as plates. This study aims to determine the buckling strength of isotropic and quasi-isotropic plates. The method used is the Finite Element Method (MEH). The isotropic material uses aluminum 2024-T3, while the quasi-isotropic material uses carbon/epoxy T300-5208 with a [0°/90°/45°/-45°]s laminate arrangement. Modeling and analysis using MSC Patran and Nastran software. The buckling analysis results show the critical buckling stress value on the isotropic plate is and on the quasi-isotropic plate is and is still within safe limits when viewed from the Buckling Load Factor (BLF) with a value >1.

Analysis of Vibration Characteristics of EFT-E610P Drone Using Modal Analysis Method Kamila, Amalia; Prattiwi, Elisabeth Anna; Setiawan, Paulus; Hartini, Dwi; Priyahapsara, Istyawan; Astuti, Yenni
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.v6i2.3679

This research examines the vibration characteristics of the EFT-E610P type agricultural drone through flight tests and modal analysis. It aims to identify and analyze vibration properties like amplitude deviation, period, frequency, and waveform in the drone's mechanical system to ensure flight stability and safety. The study collects real-time vibration data using accelerometer sensors, processes it using Fourier transform, and interprets the main vibration features. Results show that the vibration parameters remain within a reasonable range corresponding to the drone’s natural structural properties, with no signs of instability or harmful oscillations. Amplitude fluctuations and dominant frequency shifts indicate the drone’s dynamic response to speed and structural changes but remain stable. The study concludes that the EFT-E610P drone exhibits normal vibration behavior during tests, with no negative impact on flight performance or safety, supporting its effective operation.

GPS Signal Performance Testing Based on Material Variations Of Portable On-Demand (POD) And GPS Placement For Aerial Photography Missions Kehi, De Richi; Hartini, Dwi; Mardwianta, Benedictus; Prattiwi, Elisabeth Anna; Santoso, Djarot Wahju
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.v6i1.3118

In aerial photography, the use of camera systems integrated with GPS signals is crucial for determining the position and velocity of an aircraft or drone. The Portable On-Demand (POD) serves as a payload container for equipment such as cameras, and the POD material can influence GPS signal quality. This study aims to evaluate the quality of received GPS signals and to assess the effect of camera distance on GPS performance. Experimental tests were conducted using three POD material types (original, E-glass, and carbon) and two GPS systems (Emlid Reach and Pixhawk). The results indicate that the E-glass POD provides the best performance, achieving signal-to-noise ratio (SNR) values above 45 dB and a PDOP value of 1.7. Additionally, the E-glass POD detected up to 34 satellites at a camera distance of 0 cm. In contrast, the original and carbon PODs exhibited inferior performance, including occurrences of a “No Solution” status. Therefore, the E-glass POD is more reliable in maintaining GPS signal quality and positioning accuracy for aerial photography missions.

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

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.

Co-Authors Agung Prakoso Arfandi Achmad Arifqi M, Muh. Nadlah Azhar, Azwari Bangga Dirgantara Adiputra Benedictus Mardwianta, Benedictus Buyung Junaidin, Buyung Djarot Wahju Santoso E.Nasution, M.Ridlo FAJAR NUGROHO Freddy Kurniawan Habibi Habibi Ilhami, Nuzula Imanda, Rafly Indah Lestari, Dwi Islami, Alfi Daffa Istyawan Priyahapsara Kamila, Amalia Kehi, De Richi Mai Fransiska, Helga Mubarak, Pramuda Naufal Noviyanto F, Hendrix Pangkey, Calvin Delano Immanuel Pinandita, Lazuardy Rahendra Prasetyo Edi, Prasetyo Prattiwi, Elisabeth Anna Rahmawati, Fajar Khanif Sahuburua, Stevward Norenssio Santo Herlambang Santoso, Prasidananto Nur Satriana, Desmi Seran Luan, Randi Edward Setiawan, Paulus Sri Mulyani Sri Mulyani Suhanto, Suhanto Suyoko Suyoko Taufiqurohman, Taufiqurohman Teguh Wibowo Wibowo, Irfan Yasrin Zabidi, Yasrin Yenni Astuti, Yenni

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