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Studi Modifikasi Geometri Sudu pada Turbin Air Propeller Menggunakan Metode Elemen Hingga Darsono, Febri Budi; Nurdin, Akhmad; Widodo, Rahmat Doni; Rusiyanto, Rusiyanto
Jurnal Rekayasa Mesin Vol 16, No 3 (2021): Volume 16, Nomor 3, Desember 2021
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v16i3.2498

Desain kekuatan turbin air propeller berdasarkan ketahanan terhadap pembebanan gaya aksial dari air. Pembebanan gaya aksial pada turbin air propeller menyebabkan tegangan bending pada sudu dan berpotensi terjadi kegagalan sudu pada struktur turbin. Tujuan dari penelitian ini untuk membandingkan kekuatan modifikasi desain geometri turbin air propeller, yaitu penambahan fillet pada sisi hub sudu dan penambahan ketebalan sudu. Pengambilan data penelitian ini dengan Metode Elemen Hingga menggunakan Solid Works Simulation 2016 dan pembebanan pada sudu dengan tekanan statik. Hasil akhir penelitian ini menunjukkan bahwa modifikasi desain geometris dengan penambahan ketebalan sudu lebih meningkatkan faktor keamanan dibandingkan penambahan fillet pada sisi hub sudu.

Kekuatan Bending dan Tarik Komposit Berpenguat Serat Eceng Gondok/Tebu Bermatrik Epoxy Widodo, Rahmat Doni; Sutanto, Herry; Fitriana, Deni Fajar; Rusiyanto, Rusiyanto; Darsono, Febri Budi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1417

The use of natural fiber as composite material is growing rapidly due to excellent characteristics, environmentally friendly quality and low price. For this reason, natural fiber breaks the dominance of synthetic fiber composite previously used in industries, especially in automotive manufacturing. The purpose of this study is to determine the effect of fiber orientation on the flexural and tensile strength of water hyacinth-sugarcane fiber composite with epoxy matrix. The composite then be tested as an alternative to doortrim. Fiber orientation applied to specimens was random for sugarcane fiber, but continuous on water hyacinth fiber with angle variants of -45/45, 45/90, 45/45, and 90/90. Specimen standard for flexural test is ASTM D790-15 and ASTM D638-14 for tensile test. The study results show that the highest average value for flexural strength is 51.7 MPa of the 45/90 variant, while the lowest average value of 16.6 MPa is the 45/45 variant. Both 45/90 and -45/45 variants have the highest tensile strength of 30 MPa. The 90/90 variant records the weakest tensil strength value of 20 MPa. The highest flexural and tensile strength values exceed minimum score of the SNI 01-4449-2006 and equal the values of panel assy backdoortrim. This experiment proves that fiber orientation affects mechanical properties of composite materials, especially in terms of flexural or tensile strength.

PENGARUH PENGGUNAAN MAGNET EKSTERNAL DAN VARIASI ARUS PADA PENGELASAN TIG TERHADAP STRUKTUR MIKRO KEKERASAN DAN KEKUATAN TARIK BAJA KARBON RENDAH Paundra, Fajar; Yudanta, Faturrizky Rakha; Muhyi, Abdul; Pujiyulianto, Eko; Syanur, Farid Nanda; Darsono, Febri Budi
SINERGI POLMED: Jurnal Ilmiah Teknik Mesin Vol. 5 No. 2 (2024): Edisi Agustus
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/sinergipolmed.v5i2.1561

Medan magnet eksternal dapat meningkatkan kualitas dari hasil pengelasan TIG. Penelitian ini bertujuan untuk mengetahui pengaruh medan magnet eksternal dalam proses pengelasan TIG. Material yang digunakan dalam penelitian ini adalah baja SS400. Proses pengelasan menggunakan TIG (Tungsten Inert Gas) dengan variasi arus 70 A, 80 A, 90 A, dan 100 A serta menggunakan tambahan 2 magnet eksternal jenis Neodymium. Pengujian hasil pengelasan berupa struktur makro, mikro, uji kekerasan vickers dan uji tarik. Hasil pengujian struktur makro menunjukan beberapa cacat hasil pengelasan seperti Porositas, Incomplete Penetration, Underfill, dan Distorsi. Sedangkan hasil pengujian struktur mikro menunjukan pada base metal terdapat struktur jenis Ferrite dan Pearlite. Bagian HAZ terdapat struktur jenis Ferrite, Pearlite, dan Martensite. Hasil pengujian tarik paling tinggi terdapat pada sambungan pengelasan TIG tanpa menggunakan magnet dengan arus 100 A yaitu sebesar 368,234 MPa. Hasil pengujian kekerasan paling tinggi terdapat pada sambungan pengelasan TIG menggunakan magnet dengan arus 100 A yaitu sebesar 176,712 HVN. Penggunaan magnet eksternal dapat menghasilkan penetrasi besar saat proses pengelasan dan mengahasilkan sambungan las yang baik. Sebaliknya, hal tersebut dapat berakibat buruk terhadap hasil pengelasan jika jarak busur listrik dengan material tidak tepat, dan torch tidak bergerak sesuai pada jalur pengelasan.

Analisis Numerik Performa Propulsi Kapal Ikan guna Meningkatkan Efisiensi dan Gaya Dorong Menggunakan Pendekatan CFD (Computational Fluid Dynamics) Prasdika, Tegar Oki; Bahatmaka, Aldias; Kriswanto, Kriswanto; Darsono, Febri Budi
Jurnal Pendidikan dan Teknologi Indonesia Vol 5 No 5 (2025): JPTI - Mei 2025
Publisher : CV Infinite Corporation

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52436/1.jpti.771

Indonesia merupakan negara maritim dengan sumber daya perikanan yang melimpah, menghadapi berbagai permasalahan dalam sektor perikanan, khususnya terkait dengan kapal ikan. Beberapa masalah utama termasuk mematuhi regulasi, menggunakan kapal dengan teknologi yang tidak memadai, dan praktik penangkapan ikan yang merusak lingkungan. Penelitian ini bertujuan untuk menghitung nilai torsi dan gaya dorong yang dihasilkan dari baling-baling kapal ikan dalam meningkatkan efisiensi kapal. Metode yang digunakan dalam penelitian ini menggunakan pendekatan CFD (Computational Fluid Dynamics) menghitung dan mensimulasikan pengaruh gaya dorong dan torsi pada baling-baling terhadap sudut kemiringan poros 0°, 30°, 50°, dan 60°. Sebelum melakukan simulasi, proses validasi telah dilakukan dengan nilai error di bawah 5% dalam kondisi lurus tanpa kemiringan. Hasil dari penelitian ini menunjukkan bahwa baling-baling dengan posisi kemiringan 50° memiliki nilai gaya dorong dan torsi yang optimal dengan nilai gaya dorong 55809 N dan torsinya adalah 72111,5 Nm. Hal ini hasil analisis tersebut pada Propeller kapal ikan dapat berdampak besar pada kesejahteraan nelayan, keberlanjutan lingkungan, dan efisiensi operasional. Desain Propeller yang lebih efisien, hambatan hidrodinamis yang lebih rendah, dan efisiensi bahan bakar dapat dicapai melalui hasil simulasi CFD yang optimal.

Pengembangan Media Pembelajaran untuk Meningkatkan Capaian Pembelajaran pada Mata Pelajaran Teknik Dasar Pengelasan Harsandi, Zaidan Priya; Huda, Khoirul; Kriswanto, Kriswanto; Darsono, Febri Budi; Nuryanta, Muhammad Irfan; Ramadhani, Risky
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 5 No. 3 (2025): July
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v5i3.492

This study aims to develop and evaluate the feasibility and effectiveness of Android-based learning media in improving students' Learning Outcomes (CP) in Basic Welding Techniques, especially in Gas Metal Arc Welding (GMAW) material at SMKN 3 Salatiga. A quantitative research approach was used with the ADDIE development model and an experimental method using the Pretest-Posttest Control Group Design. The research subjects consisted of two classes, an experimental class and a control class, each consisting of 35 students. Validation by content experts showed a feasibility score of 82%, categorized as very feasible, while validation by media experts produced a score of 74%, categorized as feasible. The results of the normality and homogeneity tests showed that the data were normally distributed and homogeneous. An independent t-test showed a significant difference between the experimental and control groups (p < 0.05) with an average increase of 22.686. In addition, the average N-Gain score in the experimental class was 0.5171 (moderate category), compared to only 0.0199 (low category) in the control class. These findings demonstrate that Android-based learning media has proven effective, feasible, and can be used as an innovative alternative in engineering learning in Vocational High Schools (SMK). This media not only improves student learning outcomes but also supports a more interactive learning process that aligns with current developments in educational technology. This media also has practical benefits in helping teachers deliver material more efficiently and engagingly, and has the potential to support the development of a vocational curriculum that is more adaptive to the needs of the workplace.

Penerapan teknologi pengering pelet untuk peningkatan kualitas dan produksi pakan ternak di CV Sibad Engineering Semarang Bahatmaka, Aldias; Fitriyana, Deni Fajar; Darsono, Febri Budi; Wibowo, Muhammad Yusuf; Fahmi, Fiqri Fadillah; Hidayat, Indra Nurul; Buana, Lanang Puspa; Ghyferi, Andi Abdullah
KACANEGARA Jurnal Pengabdian pada Masyarakat Vol 8, No 1 (2025): Februari
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/kacanegara.v8i1.2576

Pakan ternak merupakan faktor terbesar yang mempengaruhi produktivitas ternak. Dalam hal ini, mitra masih mengalami kendala dalam proses pengeringan pelet sebagai pakan ternak. Hal yang masih dilakukan dengan melakukan proses pengeringan pakan ternak terdahulu yaitu masih dilakukan secara konvensional dengan dijemur dibawah terik sinar matahari, sehingga tidak efektif dalam mengeringkan pakan ternak. Oleh karena itu perlu penerapan teknologi pengeringan dari hasil pengolahan pakan ternak menggunakan mesin rotary dryer. Mesin pengering dengan rotary dryer ini, pakan ternak dapat dikeringkan menggunakan drum pengering yang terbuat dari baja tahan karat dan dengan sistem kontrol komponen PLC. Hasil pengeringan menggunakan mesin pengering rotary dryer dihasilkan dalam bentuk serbuk atau butiran. Penerapan teknologi mesin rotary dryer ini dirancang untuk mencapai beberapa tujuan, termasuk meningkatkan efisiensi pengeringan pakan ternak dan meningkatkan kualitas dan produksi pakan ternak. Penerapan teknologi mesin pengering rotary dryer ini diharapkan dapat meningkatkan kualitas dan produksi pakan ternak di CV SIBAD Engineering Semarang.

TINJAUAN LITERATUR: PENINGKATAN KETAHANAN API DAN SIFAT MEKANIK PADA KOMPOSIT POLIMER DENGAN PENAMBAHAN BAHAN LIMBAH GEOPOLIMER Afandi, Ridwan; Nurdin, Akhmad; Hastuti, Sri; Darsono, Febri Budi; Paundra, Fajar
Steam Engineering Vol. 6 No. 1 (2024): STEAM Engineering, Vol. 6, No. 1, September 2024
Publisher : Program Studi Pendidikan Teknik Mesin, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37304/jptm.v6i1.13368

Composite polymers are now under development and are widely used in automobile manufacturing for interior panels, door panels, and bodywork. The research and development of polymer composites for the automobile manufacturing must have resilient fire resistance requirements. Currently, polymer composites with fire resistance capabilities have been developed with geopolymer materials, which offer benefits and produce excellent performance. Geopolymers are inorganic polymers that contain aluminosilicates, silica oxides, and alumina oxides. They have thermally resistant mechanical characteristics. Geopolymer materials are commonly derived from waste materials, including those utilized as additions to polymer composite materials, specifically coal fly ash and clay-based waste. The purpose of this literature is to discuss the path and progress of waste-based polymer reinforced composite technology for fire resistance. The methodology employed in this study takes a conceptual approach to articles on the influence of adding different types of geopolymer materials on the fire resistance properties of natural fiber reinforced composites. According to the findings, articles involving the inclusion of geopolymer materials tend to lower resistance to tensile and flexural stresses, whilst the addition of this geopolymer material reduces fire resistant qualities.

Kekuatan Bending dan Tarik Komposit Berpenguat Serat Eceng Gondok/Tebu Bermatrik Epoxy Widodo, Rahmat Doni; Sutanto, Herry; Fitriana, Deni Fajar; Rusiyanto, Rusiyanto; Darsono, Febri Budi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1417

The use of natural fiber as composite material is growing rapidly due to excellent characteristics, environmentally friendly quality and low price. For this reason, natural fiber breaks the dominance of synthetic fiber composite previously used in industries, especially in automotive manufacturing. The purpose of this study is to determine the effect of fiber orientation on the flexural and tensile strength of water hyacinth-sugarcane fiber composite with epoxy matrix. The composite then be tested as an alternative to doortrim. Fiber orientation applied to specimens was random for sugarcane fiber, but continuous on water hyacinth fiber with angle variants of -45/45, 45/90, 45/45, and 90/90. Specimen standard for flexural test is ASTM D790-15 and ASTM D638-14 for tensile test. The study results show that the highest average value for flexural strength is 51.7 MPa of the 45/90 variant, while the lowest average value of 16.6 MPa is the 45/45 variant. Both 45/90 and -45/45 variants have the highest tensile strength of 30 MPa. The 90/90 variant records the weakest tensil strength value of 20 MPa. The highest flexural and tensile strength values exceed minimum score of the SNI 01-4449-2006 and equal the values of panel assy backdoortrim. This experiment proves that fiber orientation affects mechanical properties of composite materials, especially in terms of flexural or tensile strength.

Pengembangan Buku Ajar pada Mata Kuliah Praktikum Pemesinan Berbasis Project Based Learning Huda, Khoirul; Iskandar, Ranu; Darsono, Febri Budi; Hidayat, Hanif; Ahda, Zahrah Zakiya
Jurnal Ilmiah Wahana Pendidikan Vol 10 No 4 (2024): Jurnal Ilmiah Wahana Pendidikan
Publisher : Peneliti.net

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.10886479

A learning model known as "project-based learning" makes use of projects or activities as media. Project-based learning is used in the lecture-based lathe machining practicum course. development into the creation of a project-based learning-based textbook for student learning materials on lathe machining practicums. The steps of analysis, design, media development, expert validation, and field testing are all included in the textbook development process. The average percentage received from material expert validation was 89%, whereas the average percentage obtained from media expert validation was 90.5%. Following field testing on students participating in a lathe machining practicum and expert validation, the field trial results yielded an 88.66% percentage. Expert validation and field testing results show that the textbook fits into the very good category.

Peningkatan kualitas hasil pengecatan melalui penerapan mesin rotary polisher di bengkel Yunex Paint desa Gesing Temanggung Hidayat, Hanif; Asri, Sarwi; Iskandar, Ranu; Darsono, Febri Budi; Budiman, Febrian Arif; Gendroyono, R. Ambar Kuntoro Mursit; Waskito, Wiji Ninggar; Najiah, Siti Thoifatun; Ramadhan, Dimas Iqbal
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 8, No 3 (2024): September
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v8i3.25737

Abstrak Tingginya jumlah penjualan kendaraan bermotor di Indonesia yang mencapai 94.067 unit pada tahun 2023 dapat menyebabkan berbagai permasalahan seperti kemacetan dan kecelakaan. Selain menimbulkan korban jiwa kecelakaan lalu lintas juga menyebabkan kerugian materi berupa kerusakan pada kendaraan seperti goresan atau penyok pada panel bodi mobil. Kerusakan tersebut dapat diperbaiki melalui proses pengecatan ulang untuk mengembalikan ke kondisi semula. Kualitas hasil pengecatan yang baik dapat dilihat dari nilai lekat dan nilai kilapnya. Nilai kilap menandakan kualitas hasil pengecatan yang dapat meningkatkan estetika dari sebuah kendaraan. Bengkel Yunex Paint yang beralamat di Desa Gesing Temanggung dipilih menjadi mitra pengabdian karena bergerak di perbaikan bodi dan pengecatan yang setiap minggunya mampu mengerjakan 2 unit mobil dengan total waktu pengerjaan 4-6 hari untuk pengecatan ulang panel bumper maupun kap mesin. Bengkel ini masih banyak menghadapi berbagai permasalahan pada proses produksi seperti hasil pengecatan yang kurang mengkilap karena finishing masih dilakukan secara manual sehingga jumlah mobil yang dikerjakan tidak mengalami peningkatan menyebabkan perkembangan usahanya kurang signifikan. Mengatasi permasalahan tersebut maka diusulkan penerapan mesin rotary polisher yang diharapkan dapat meningkatkan efisiensi waktu dan kualitas hasil pengecatan, sehingga meningkatkan daya saing dan produktivitas Bengkel Yunex Paint. Pengabdian ini melibatkan 11 orang termasuk dengan pekerja bengkel. Metode pelaksanaan meliputi ceramah, demonstrasi, praktik langsung serta pendampingan, dan pengambilan data. Data hasil ukur daya kilap yang didapatkan yaitu 24,7 sebelum finishing, 85,3 sesudah finishing manual dan 94,1 sesudah finishing menggunakan mesin rotary polisher. Dari data yang didapatkan mesin rotary polisher dapat menambah nilai kilap hasil finishing pengecatan. Kata kunci: kualitas pengecatan; nilai kilap; mesin rotary polisher. Abstract The high number of motor vehicle sales in Indonesia, which reached 94,067 units in 2023, can cause various problems such as congestion and accidents. In addition to causing casualties, traffic accidents also cause material losses in the form of damage to vehicles such as scratches or dents on car body panels. The damage can be repaired through the repainting process to restore it to its original condition. The quality of good painting results can be seen from the adhesion value and gloss value. The gloss value indicates the quality of the painting results that can improve the aesthetics of a vehicle. The Yunex Paint workshop located in Gesing Village, Temanggung, was chosen as a service partner because it is engaged in body repair and painting which every week is able to work on 2 units of cars with a total processing time of 4-6 days for repainting bumper panels and hoods. This workshop still faces many problems in the production process such as painting results that are less shiny because finishing is still done manually so that the number of cars being worked on has not increased causing insignificant business development. Overcoming these problems, the application of a rotary polisher machine is proposed which is expected to increase the efficiency of time and quality of painting results, thereby increasing the competitiveness and productivity of the Yunex Paint Workshop. This service involved 11 people including workshop workers. The implementation method includes lectures, demonstrations, hands-on practice and mentoring, and data collection. The gloss measurement data obtained were 24.7 before finishing, 85.3 after manual finishing and 94.1 after finishing using a rotary polisher machine. From the data obtained, the rotary polisher machine can increase the gloss value of the painting finishing results. Keywords: painting quality; gloss value; rotary polisher machine.

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