Mesin https://journals.itb.ac.id/index.php/jtms <p><img class="imgdesc" src="https://lppm.itb.ac.id/wp-content/uploads/sites/55/2021/08/JTMS_ITB_small.jpg" alt="" /></p> <p style="text-align: justify;"><strong>MESIN</strong> merupakan Jurnal Nasional, yang di dalamnya mencakup ilmu dan aplikasi Teknik Mesin, Teknik Dirgantara, Teknik Material, dan Teknik Manufaktur. Jurnal Mesin diterbitkan pertama kali pada bulan Januari tahun 1982 dengan topik utama pada bidang teknik mesin.</p> <p>Sebagai jurnal nasional, Jurnal Mesin memiliki tujuan untuk dapat menyebarluaskan informasi dan publikasi terkini terkait penelitian dan pengembangan teknologi dan inovasi untuk para peneliti dan praktisi Teknik Mesin, Teknik Dirgantara, dan Teknik Material di Indonesia. Dalam perkembangannya, Jurnal Mesin telah mendapat International Standard Serial Number (ISSN) versi cetak dari Pusat Data dan Dokumentasi Ilmiah LIPI pada tahun 2007, dan ISSN versi elektronik dengan SK no. 0005.2580765X/JI.3.1/SK.ISSN/2017.07 pada tanggal bulan Juli 2017.</p> <p>Sampai saat ini, tim editor Jurnal Mesin terus berupaya meningkatkan kuantitas dan kualitas penerbitan makalah ilmiah untuk menjadi Jurnal Nasional berdampak luas di Indonesia, melalui penelitian terbaru di bidang Teknik Mesin, Teknik Dirgantara, Teknik Material dan disiplin ilmu terkait.</p> <p><strong>SK Akreditasi</strong></p> <p>E-ISSN : <a href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1494398336&amp;26&amp;&amp;" target="_blank" rel="noopener">2580-765X</a></p> <p>P-ISSN : <a href="http://issn.pdii.lipi.go.id/issn.cgi?daftar&amp;1180433813&amp;1&amp;&amp;" target="_blank" rel="noopener">0852-6095</a></p> <p><strong>Recent Issue</strong></p> <p>Jurnal dari edisi yang terakhir diterbitkan: <a href="https://journals.itb.ac.id/index.php/jtms/issue/view/942" target="_blank" rel="noopener">https://journals.itb.ac.id/index.php/jtms/issue/view/942</a></p> <p> </p> Faculty of Mechanical and Aerospace Engineering id-ID Mesin 0852-6095 Two-Dimensional Analysis of Lower Extremities to Predict Best Initial Condition on Marching Movement https://journals.itb.ac.id/index.php/jtms/article/view/16441 <p>Himpunan Mahasiswa Mesin ITB has a specific type of marching that follows a march song’s rhythm called <em>derap</em>. In practice, <em>derap</em> movement in a group was harder to be maintained and aligned. This difficulty was observed by noting the height differences that occur in the individual's movements during the initial and middle of the march. This study intends to observe and find how the differences vary during this motion. This study utilized five active markers to track the landmarks of the right side of the lower extremities while the motion was captured using a 60 frames per-second (fps) action camera. The duration of the movement in this study was also constrained with three cycles of marching song at 115 bpm. The direct Linear Transformation (DLT) method was used to calibrate the camera and reconstruct the movements using captured marker positions. As the results, the knee angle ROM has decreased from 26.55° to around 15°, which happened during the second song cycle and kept stable for the rest of the movement. This result brought the conclusion that the more extensive <em>derap</em> motion would tend to change the form of the body compared to the initial state.</p> Daffa Faisal Afif Ni Made Ayu Sinta Dewi Denis Irham Naufran Felix Paskalis Ferryanto Ferryanto Hak Cipta (c) 2023 Mesin 2023-12-28 2023-12-28 29 2 106 116 10.5614/MESIN.2023.29.2.1 A Review of Valorization of Okara and Okara Nanocelullose Derived from Soybean Industrial Waste for Biosorbent Applications https://journals.itb.ac.id/index.php/jtms/article/view/22381 <p>Okara, the solid waste from tofu production, holds abundant potential in Indonesia. This review explores its application as a biosorbent for wastewater treatment, specifically as aerogels and hydrogels. Wastewater poses environmental risks due to pollutants like heavy metals, organic compounds, and microbes. This review discusses okara biosorbent, either in its natural form or modified to obtain cellulose, that proves effective in binding pollutants. Nanocellulose-based okara biosorbent enhances the absorption of heavy metals and textile dyes, surpassing traditional biosorbents. Its low lignin concentration simplifies its process of obtaining cellulose, compared to other lignocellulosic materials.</p> Dita Puspitasari Lia Amelia Tresna Wulan Asri Nur Fadhilah Syarif Hak Cipta (c) 2023 Mesin 2023-12-28 2023-12-28 29 2 117 131 10.5614/MESIN.2023.29.2.2 Drag Minimization of Low Subsonic Airfoil with Constrained Genetic Algorithm https://journals.itb.ac.id/index.php/jtms/article/view/22455 <p>Drag minimization of low subsonic airfoil was conducted with constrained genetic algorithm (CGA). To cope with the constraints, each of these two different types of constraint handling techniques (CHTs), namely Superiority of Feasible Individual (SoF) and Generalized Multiple Constraint Ranking (G-MCR) were employed to the CGA and compared. From three independent runs for each CHT, it was obtained that G-MCR performed significantly better than SoF, indicating that G-MCR, a novel type of CHT, provides better exploration of the design space to obtain better solution. The obtained best airfoil designs were compared with a baseline airfoil and analyzed. The best optimum airfoil increases the aerodynamic efficiency by 21.4%. It was observed that the reduction of drag only occurs locally, so that a robust optimization is required in the future.</p> Yohanes Bimo Dwianto Ardanto Mohammad Pramutadi Hak Cipta (c) 2023 Mesin 2023-12-28 2023-12-28 29 2 132 145 10.5614/MESIN.2023.29.2.3 Multi-Objective Finned-Tube Heat Exchanger Optimization Using a Genetic Algorithm https://journals.itb.ac.id/index.php/jtms/article/view/22376 <p>Heat exchangers are a significant component in many industries, particularly in energy conversion systems. The design of heat exchangers itself is a complex process because it involves experience-based decisions, numerous variables and parameters, and some of them are competing with each other. Genetic Algorithms (GAs) are one of the first evolutionary algorithms which remains one of the most extensively used non-linear optimization methods today. This study explores the implementation of Non-Dominated Sorting Genetic Algorithm II (NSGA-II) for thermal design and optimization of a finned-tube heat exchanger. The chosen objective functions were minimizing the heat exchanger volume and minimizing the air side pressure drop. The decision variables for the design were tube outer diameter, number of tube rows, fin pitch, unit height, and unit width. The calculated parameters and estimated cost of both preliminary design and optimized design were also compared. The optimized design offered a bigger alternative design while meeting all the constraints according to standards and industrial needs. The annualized cost of the optimized design is only 30.4% of the preliminary design, and the air pressure drop can be reduced to 19.5% of the preliminary design, with a 12.4% increase in volume.</p> Nadiyah Rizki Suyatna Firman Bagja Juangsa Prihadi Setyo Darmanto Hak Cipta (c) 2023 Mesin 2023-12-29 2023-12-29 29 2 146 162 10.5614/MESIN.2023.29.2.4 Analisis Statik Bus Konversi Listrik Berbasis Ladder Frame Chassis https://journals.itb.ac.id/index.php/jtms/article/view/22280 <p>Konversi kendaraan <em>Internal Combustion Engine</em> (<em>ICE)</em> menjadi kendaraan Listrik dapat mempercepat peningkatan jumlah populasi <em>Electric Vehicle</em> (EV) yang mengurangi emisi gas <em>carbon</em>. Makalah ini menjelaskan proses analisis statik yang merupakan salah satu bagian penting saat mengkonversi bus berbasis ICE menjadi bus listrik. Bus yang dikonversi perlu memperhatikan pembebanan statik, khususnya berat dan posisi <em>Center of Gravity</em> (<em>CoG) </em>pada struktur sasis karena mempengaruhi performa Bus. Penimbangan massa dilakukan pada sasis untuk mengetahui letak <em>CoG</em> setiap kondisi. Massa sasis dengan muatan komponen elektrik setelah ditimbang adalah 2774 kg sedangkan massa sasis model <em>CAD</em> 2760,78 kg. <em>Persentase</em> <em>error</em> massa sasis pada CAD terhadap massa sasis hasil pengukuran cukup baik, yaitu 0,48%. Total perhitungan massa komponen elektrik dan <em>upperstructure</em> adalah 1612 kg dan 2854,4 kg. Analisis distribusi beban sepanjang sasis menggunakan pendekatan <em>Finite Element Analysis</em> dengan menerapkan metode analisis linear statik. Pembebanan komponen elektrik menghasilkan maksimum <em>displacement</em> 3,49 mm, <em>von Mises stress</em> 78,47 MPa dan <em>reaction force</em> -577,4 N pada sasis. Sedangkan, pembebanan total dengan menambahkan <em>upperstructure</em> menghasilkan maksimum <em>displacement</em> 4,58 mm, <em>von Mises</em> <em>stress</em> 83,95 MPa, dan <em>reaction force</em> -1174 N dengan nilai <em>safety factor</em> 5,24. Perbandingan <em>error</em> nilai defleksi suspensi depan dan belakang antara simulasi dengan teoritik adalah 4,99% dan 4,93%. Hasil investigasi menunjukan nilai kekakuan pada suspensi pegas daun depan dan belakang masing-masing sekitar 285 N/mm dan 320 N/mm. Selain itu, struktur sasis dengan pembebanan total mengalami tegangan maksimum di sekitar suspensi belakang.</p> <p> </p> Ilman Arpi Robby Dwianto Bentang Arief Budiman Hak Cipta (c) 2023 Mesin 2023-12-31 2023-12-31 29 2 163 179 10.5614/MESIN.2023.29.2.5