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All Journal INOTEKS : Jurnal Inovasi Ilmu Pengetahuan, Teknologi, dan Seni FLYWHEEL : Jurnal Teknik Mesin Untirta Planta Tropika Conference SENATIK STT Adisutjipto Yogyakarta Angkasa: Jurnal Ilmiah Bidang Teknologi Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal PADMA: Pengabdian Dharma Masyarakat Vortex Jurnal Peradaban Masyarakat (JPM) Mestaka: Jurnal Pengabdian Kepada Masyarakat AME (Aplikasi Mekanika dan Energi) : Jurnal Ilmiah Teknik Mesin Hikamatzu Journal of Multidisciplinary Research Journal of Integrated Knowledge and Innovation

Fajar Nugroho

Institut Teknologi Dirgantara Adisutjipto

Author-ID : 333260

Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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Peran stop-drilling dalam menurunkan konsentrasi tegangan crack-tip material aluminium 2024-T3 Prattiwi, Elisabeth Anna; Wibowo, Irfan; Nugroho, Fajar; Hartini, Dwi; Santoso, Djarot Wahju
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 16, No 2 (2024): November
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v16i2.2597

Dalam penelitian ini membahas pengaruh metode stop-drilling terhadap konsentrasi tegangan pada crack tip struktur pesawat terbang menggunakan material aluminium 2024-T3 pada skin aileron Cessna-150 dengan mengasumsikan dengan bentuk spesimen bersegi panjang. Metode stop-drilling adalah teknik perbaikan yang digunakan untuk mengurangi perambatan crack pada struktur pesawat. Analisis yang digunakan pada penelitian ini menggunakan analisis numerik yaitu Finite Element Analysis (FEA) dilakukan untuk menentukan hasil Von-Mises stress pada spesimen untuk mengetahui konsentrasi tegangan pada crack tip. Hasil penenlitian ini menunjukkan bahwa diameter lubang 3,454 mm menghasilkan konsentrasi tegangan terendah dengan nilai 18,1, sedangkan diameter lubang 3,048 mm menghasilkan konsentrasi tegangan tertinggi dengan nilai 19,0. Hasil penelitian menunjukan bahwa panjang crack 50,8 mm menghasilkan konsentrasi tegangan tertinggi dengan nilai 18,5. Dari hasil menunjukan penempatan stop-drilling tipe C memiliki konsentrasi tegangan tertinggi dengan nilai 20,6. Sedangkan penempatan stop drilling tipe A memiliki konsentrasi tegangan terendah dengan nilai 10,5

PENGARUH KOMPOSISI SKIN TERHADAP KEKUATAN BENDING PADA KOMPOSIT SANDWICH SERAT AREN-POLYESTER DENGAN SERBUK KAYU SENGON-POLYESTER Nugroho, Fajar; Ahmadi, Nurfi
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.v4i1.1425

Komposit sandwich adalah jenis komposit yang mempunyai kekuatan tinggi apabila digunakan sebagai struktur primer maupun sekunder. Komposit juga memiliki kelebihan dari sifat mekaniknya, tahan korosi, massa jenis yang kecil dan proses pembuatannya yang sederhana. Penelitian ini bertujuan untuk menyelidiki pengaruh variasi fraksi volume lapisan kulit serat aren dengan inti limbah gergaji kayu sengon laut terhadap kekuatan bending komposit sandwich bermatriks polyester. Bahan penelitian ini adalah serat aren, unsaturated polyester resin 157 BQTN-EX, serbuk limbah gergaji kayu sengon laut dan urea formaldehide. Spesimen ini dibuat dengan metode cetak tekan dengan tebal skin (2 mm) dan tebal core (10 mm). Pengujian bending komposit sandwich ini mengacu pada standar ASTM D-790-03. Metode yang digunakan dalam proses pembuatan komposit ini adalah metode hand lay up.Hasil penelitian menunjukkan nilai kekuatan bending mengalami kenaikan dari variasi fraksi volume 20% : 80% ke variasi fraksi volume 40% : 60%, dengan nilai tegangan lentur maksimum tertinggi 54,87 N/mm2 pada variasi fraksi volume 40% : 60%. Berdasarkan hal ini dapat diketahui bahwa seiring penambahan serat maka turut mempengaruhi nilai tegangan yang dihasilkan. Hasil pengujian morfologi pada variasi 30% : 70% ditemukan adanya void atau pori-pori di sekitar permukaan spesimen.

Analysis of the influence of groove welds of oxy-acetylene welding joints on tensile strength and microstructure on steel ST 37 Nugroho, Fajar; Muga, Yohanes Fernando Leo; Setiabudi, Dedet Hermawan; Sudarmanto, Sudarmanto
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.v5i1.1955

In this study, the authors conducted a study on the analysis of the effect of oxy-acetylene welding joints on tensile strength and microstructure in the HAZ and weld metal areas on st 37 steel plates. The results of this study indicate that the average value of the highest tensile strength value is at V groove weld with the average strength of the welded joint is 4.796 kgf/mm2. While the lowest tensile stress is on the I groove weld of 4.674 kgf/mm2. Meanwhile, from the microstructure test, it can be seen that in the HAZ area each groove. Microstructure in the HAZ area shows that the double V groove weld types are fine ferrite, coarse pearlite and martensite. In type V groove weld the structures formed are ferrite, coarse pearlite and martensite. In type I groove weld the structures formed are ferrite, grain boundary ferrite and fine pearlite. Whereas in the weld metal area, and the results of the microstructure test of the weld area on the V seam, it shows a dense microstructure arrangement, the arrangement is identical to pearlite (dark color) so that the specimen is harder.

PENGARUH KECEPATAN FEEDRATE FRICTION STIR WELDING (FSW) TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO PADA ALUMINIUM PADUAN AA 2024-T3 Nugroho, Fajar; Ahmadi, Nurfi; Hidayat, Sarif
Vortex Vol 3, No 2 (2022)
Publisher : Institut Teknologi Dirgantara Adisutjipto

Friction stir welding (FSW) adalah suatu teknologi pengelasan yang merupakan proses solid-state joining yang bisa digunakan untuk menyambungkan material aluminium dengan mampu las yang rendah. Proses FSW memanfaatkan putaran dari tool yang menggesek dua buah lempengan logam yang akan disambung. Aluminium 2024 T3 dengan ketebalan 4 mm disambung menggunakan proses FSW dengan variasi feedrate yang digunakan 13 mm/menit, 15 mm/menit, dan 25 mm/menit, kecepatan putaran spindle 910 rpm dan kedalaman pin 3 mm. Pengujian yang dilakukan adalah pengujian tarik, kekerasan dan uji struktur mikro pada masing-masing variasi pengelasan.Hasil penelitian menunjukkan bahwa kekuatan tarik dan regangan tarik tertinggi terjadi pada pengelasan dengan feedrate 25 mm/menit sebesar 221,51 MPa dan 3,60. Kemudian kekuatan tarik dan regangan tarik terendah terjadi pada pengelasan dengan feedrate 13 mm/menit sebesar 198,63 MPa dan 2,26. Nilai kekerasan tertinggi di area nugget zone dihasilkan pada pengelasan dengan feedrate 25 mm/menit yaitu sebesar 137 VHN dan nilai kekerasan terendah dihasilkan pada pengelasan dengan feedrate 13 mm/menit yaitu sebesar 105 VHN. Hasil foto struktur mikro pada area nugget zone dan TMAZ (Thermomecanically Affected Zone) mengalami perubahan seiring dengan berubahnya feedrate.

PENGARUH POSISI SHIELDED METAL ARC WELDING (SMAW) GERAK SPIRAL KAMPUH V TERHADAP KEKUATAN TARIK DAN STRUKTUR MIKRO BAJA KARBON RENDAH Ahmadi, Nurfi; Nugroho, Fajar; Ahmad A, Dadang
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.v4i1.1320

The purpose of this study was to determine the relationship between the position of shielded metal arc welding (SMAW) with spiral motion V on the tensile strength and microstructure of low carbon steel. The research was conducted by welding V-coated low carbon steel with horizontal 2G, vertical 3G and overhead 4G. The test results show that the welding position does not have a significant effect on the tensile strength of low carbon steel welds, where the 3G vertical position provides a higher tensile strength value than the 2G horizontal position and 4G overhead. The microstructure of acicular ferrite (AF) in the vertical position looks dominant uniformly and tightly.

REKAYASA MESIN PENGKABUT AIR (HUMIDIFIER CONTROL) UNTUK PENINGKATAN PRODUKSI BIBIT KLENGKENG PINGPONG Widata, Sri; Gunarso, Gunarso; Nugroho, Fajar; Herahli, Among
INOTEKS: Jurnal Inovasi Ilmu Pengetahuan,Teknologi, dan Seni Vol 15, No 1 (2011)
Publisher : Universitas Negeri Yogyakarta

This research is aimed to disclose fogging machine application effectiveness for improving klengkeng pingpong seed production. The effectiveness of fogging machine may be measured based on the degree of the fogging machine usage success in klengkeng pingpong nursery process, whose degree of achievement shall be higher than nursery process conducted in natural manner. The research result shows that the average degree of achievement in klengkeng pingpong nursery in way of seedling, top grafting, bridging or marcot, by using fogging machine is 79.26%. Meanwhile klengkeng pingpong nursery process in natural manner is approximately 40%. In return to this, it indicates that fogging machine usage on klengkeng pingpong nursery is deemed effective as it has exceeded successful level of natural klengkeng pingpong nursery. Thus, it may eventually be applied in improving klengkeng pingpong seed production

Peningkatan Pengetahuan Manfaat HKI bagi UMKM Produk Pertanian di Banguntapan Kabupaten Bantul Kusumawardani, Mawar; Subarjo, Abdul Haris; Setiabudi, Dedet Hermawan; Ahmadi, Nurfi; Nugroho, Fajar; Santoso, Prasidananto Nur; Santoso, Djarot Wahju
Mestaka: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 6 (2025): Desember 2025
Publisher : Pakis Journal Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58184/mestaka.v4i6.780

Micro, Small, and Medium Enterprises (MSMEs) entrepreneurs still focus on trading and forget the potential side of intellectual property rights, this is due to ignorance, ego, or closed nature of business actors about new ideas and entrepreneurs feel quickly satisfied with their achievements. In product marketing communications, one of the functions of intellectual property rights is as a means for cultivating a positive image in the minds of consumers, so this needs to be understood by business actors, because the benefits of intellectual property rights for products are one of the important points so that MSME agricultural products are always remembered by the public or consumers who have tried the product for a period of time and have added value from the product. In this community service activity, a presentation was carried out, and to measure quantitatively the increase in knowledge, a pretest and posttest were conducted. The results of the increase in knowledge were an increase of 39% from the posttest results for community service participants.

Structural Design Optimization of Bellcrank 3 in the N219 Aircraft Flap Flight Control System Using the Finite Element Method Hartini, Dwi; Bachtiar, Muhamad Irfan; Nugroho, Fajar; Anna Prattiwi, Elisabeth Anna; Santoso, Djarot Wahju
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.v7i1.3819

The flap control system is a critical subsystem in aircraft that directly affects aerodynamic performance and flight safety. One of the key mechanical components in this system is the bellcrank, which functions to transmit and redirect loads from the actuator to the flap mechanism. In this study, structural optimization of bellcrank 3 in the flap control system of the N219 aircraft was performed using the Finite Element Method (FEM). Three design configurations were analyzed, namely the base model, optimization model 1 with thickness reduction, and optimization model 2 with the addition of holes in non-critical areas. Structural evaluation was conducted based on mass reduction, displacement, von Mises stress, and margin of safety (MS). The simulation results show that both optimization approaches successfully reduce structural mass compared to the base model. Optimization model 1 achieves the largest mass reduction but results in higher stress levels and lower margin of safety. Optimization model 2 provides a more balanced structural performance, with stress, displacement, and margin of safety values comparable to the base model while maintaining mass reduction. All analyzed configurations exhibit positive margin of safety values, indicating that the structures remain safe under the applied operational loads. Based on the overall structural performance, optimization model 2 is considered the most suitable design for application in the flap control system of the N219 aircraft.

PENGENALAN TEKNOLOGI PENGOLAHAN PRODUK PERTANIAN KEPADA UMKM UNTUK MENINGKATKAN KETAHANAN EKONOMI PESERTA Dedet Hermawan Setiabudi; Abdul Haris Subarjo; Mawar Kusumawardani; Fajar Nugroho; Okto Dinaryanto; Djarot Wahju Santoso
Community Development Journal : Jurnal Pengabdian Masyarakat Vol. 6 No. 4 (2025): Volume 6 No 4 Tahun 2025
Publisher : Universitas Pahlawan Tuanku Tambusai

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cdj.v6i4.47998

Pertanian berkontribusi besar dalam mendorong pembangunan ekonomi, terutama di negara-negara yang sangat bergantung pada sektor ini, seperti Indonesia. Dalam pembangunan ekonomi, perhatian besar diberikan kepada sektor pertanian dan industri terkaitnya, yang sering disebut sebagai agroindustri. Dengan perkembangan teknologi pengolahan produk pertanian, terdapat peluang pengembangan Usaha Mikro, Kecil, dan Menengah (UMKM) di sektor pertanian. Agar mitra kegiatan pengabdian masyarakat mendapatkan pengetahuan tentang pemanfaatan teknologi pengolahan produk pertanian, pemilihan bahan baku produk pertanian yang berkualitas maka kegiatan ini diperlukan, diharakan dengan peningkatan pengetahuan peserta dapat menerapkan ilmunya dan meningkatkan penghasilan sehingga meningkat ketahanan ekonominya. Kegiatan pengabdian masyarakat dilakukan dengan metode presentasi oleh pemateri. Kegiatan pengabdian masyarakat yang memperkenalkan teknologi pengolahan produk pertanian dan pemilihan produk bahan baku produk pertanian yang berkualitas bagi UMKM untuk produk pertanian berjalan dengan baik dan sesuai rencana. Terdapat peningkatan pengetahuan peserta kegiatan. Peserta kegiatan cukup antusias dalam mengikuti kegiatan, hal ini terlihat dari antusiasme peserta pada saat sesi diskusi dan tanya jawab mengenai materi kegiatan serta peserta mengikuti kegiatan dari mulai awal sampai dengan akhir.

Analisis Komponen Rear Back-Up Fitting Terhadap Damage Tolerance dan Durability Pada Vertical Tail Pesawat Fajar Nugroho; Dwi Hartini; Nurfi Ahmadi; Resa Fadhol Ilahi
Angkasa: Jurnal Ilmiah Bidang Teknologi Vol 18, No 1 (2026): Februari
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/angkasa.v18i1.3403

Aircraft structures are subjected to repetitive cyclic loading that may induce fatigue damage and crack propagation, potentially compromising structural integrity and flight safety. This study examines the damage tolerance and durability of the rear back-up fitting, a critical structural component of the aircraft vertical tail. The analysis combines the Finite Element Method (FEM) to identify stress concentration regions with crack propagation simulations using D-CRACK software under representative operational loading spectra. The results indicate that the most critical locations occur at the fastener holes of PSE V03-A and PSE V03-B. PSE V03-A reaches a critical crack length of 287.646 mm after 328,801 flight cycles, while PSE V03-B reaches a critical crack length of 283.427 mm after 756,190 flight cycles. The longer fatigue life observed in PSE V03-B is primarily attributed to the presence of a stiffener, which effectively reduces stress concentration and slows crack growth rates. In accordance with FAR 25.571, the first inspection is recommended at 12,294 flight cycles for PSE V03-A and 15,000 flight cycles for PSE V03-B, followed by periodic inspections every 2,000 cycles. These results provide a quantitative basis for determining inspection intervals and support the development of a damage-tolerance-based maintenance manual to enhance structural reliability, operational safety, and long-term aircraft durability

Co-Authors Abdul Haris Subarjo Abdul Haris Subarjo abdul haris subarjo, abdul haris Adi Setiawan Ahmad A, Dadang AKTAVIA HERAWATI Among Herahli Anna Prattiwi, Elisabeth Anna Bachtiar, Muhamad Irfan Bambang Sudibya Bambang Sudibyo Dedet Hermawan Setiabudi Dedet Hermawan Setiabudi Dedet Hermawan Setiabudi, Dedet Hermawan Djarot Wahju Santoso Djarot Wahju Santoso Dwi Hartini Eko Yulianto Eli Kumolosari Fahril Khairullah Freddy Kurniawan GUNARSO GUNARSO Irfansyah, Rahmat Jaka Suyana Kurniawan, Muh. Firdaus Agung Kunto Kusumawardani, Mawar Laia, Dominikus Yoeli Wilson Mahardhika, R. Hernan Maizetri, Resti Mawar Kusumawardani Muga, Yohanes Fernando Leo Mujiyo Nugraha, Meilissar Salahuddin Alif Rahman Nur Akhmad Triwibowo Nurcahyani Dewi Retnowati Nurfi Ahmadi Nurfi Ahmadi Nurfi Ahmadi Nurfi Ahmadi, Nurfi Octavia, Dyla Midya Okto Dinaryanto Pinandhita, Lazuardy Rahendra Prattiwi, Elisabeth Anna R. Nur Ahmad Triwibowo Resa Fadhol Ilahi Santoso, Prasidananto Nur Sarif Hidayat, Sarif Sri Widata Sudarmanto Sudarmanto Sudarmanto Sudarmanto, Sudarmanto sudarmanto, Sudarmanto sudarmanto Teguh Wibowo Triwibowo, Nur Ahmad Wibowo, Irfan

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