Jurnal Teknik Mesin https://ejournal.unesa.ac.id/index.php/jtm-unesa <p><strong>JURNAL TEKNIK MESIN (JTM)</strong> is media of information and a forum for the study of mechanical engineering.&nbsp; Contains scientific papers, summaries of research results, literature reviews of student of graduate Mechanical Engineering UNESA.</p> en-US jtm_ft_unesa@yahoo.co.id (Priyo Heru Adiwibowo, ST, MT) nurainisusanti29@gmail.com (Nur Aini Susanti, S.Pd., M.Pd) Wed, 22 Jun 2022 07:25:14 +0000 OJS http://blogs.law.harvard.edu/tech/rss 60 SIMULASI NUMERIK SAYAP DENGAN AIRFOIL NACA 4412 DENGAN VARIASI SYMMETRY DAN ASYMMETRY SWEEP TERHADAP GAYA ANGKAT DAN GAYA HAMBAT https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47206 <p><em>Wings are the most important component of an airplane or unmanned aerial vehicle, when an object of various shapes is subjected to a flowing fluid, it will produce lift and drag. The airfoil of a wing can affect the performance that produced by the aircraft, which is in the form of maneuverability of the aircraft. By offering a sweep angle, it will change the airfoil to be larger or smaller according to the design, thus having an impact on the maneuverability of the aircraft. The purpose of this study was to determine the effect of variations in leading edge sweep angle 0˚; 11,10˚; and 21,42˚ to the value of lift, drag, pressure coefficient, and flow characteristic on the wing with NACA 4412 airfoil. This study use a simulation approach, with the object being studied is a wing with NACA 4412 airfoil. In the data collection technique, the software that act as the research instrument is Computational Fluid Dynamic (CFD) numerical simulation software. The mesh that used is poly-hexcore, but near the body is treated with inflation layer with quadrilateral mesh. The result data that is analyzed are contour velocity, pressure contour, lift (F<sub>L</sub>), drag (F<sub>D</sub>), and pressure coefficient (C<sub>p</sub>). From the simulation results, it can be seen that varying the sweep angle, it can affect the flow characteristic on the wing. The greater the sweep angle, the higher the lift and drag force, and the resulting C<sub>p</sub> value on the trailing edge increase which causes the pressure distribution on the lower surface of the wing increase. Considering the data that are obtained, it is known that the largest F<sub>L</sub>/F<sub>D</sub> is at sweep angle 0˚, then sweep angle 0˚ on NACA 4412 airfoil is chosen as the best variant. </em></p> <p><strong><em>Keywords</em></strong><strong><em>: </em></strong><em>Lift, Drag, Sweep angle, NACA 4412</em></p> <p>&nbsp;</p> Adhitya Akbar Waskito, Grummy Wailanduw ##submission.copyrightStatement## https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47206 Sun, 26 Jun 2022 00:00:00 +0000 PENGARUH VARIASI DIAMETER DISK PADA ENGKOL TERHADAP KARAKTERISTIK GELOMBANG AIR DAN ENERGI LISTRIK YANG DIHASILKAN DALAM GENERATOR LINIER https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47371 <p><em>Energy in the form of fuel and electricity has an important role in achieving socio-economic and environmental goals. Energy in Indonesia currently still focuses on fossil-based energy (petroleum, natural gas, and coal). Ocean waves have the potential for alternative energy that can be used for power generation due to the existence of Indonesia as a maritime area. This study aims to determine the characteristics of water waves on a linear permanent magnet generator in converting wave energy into electrical energy.</em> <em>The research method used is experiment and simulation of wave generator with linear permanent magnet generator as the object of research. The wave characteristics data taken are wave height, wave period, wavelength, wave amplitude, wave frequency, and wave propagation speed. The results of data analysis obtained are the performance of a linear permanent magnet generator including wave generation power, generator output power, and efficiency.</em> <em>The results of the study found the influence of wave interference due to reflection (reflection) which causes an increase in wave height. The generator has optimal performance at a wave height of 7.87cm with a wave generation power of 1.053 watts, a generator output power of 0.0563 watts, and an efficiency value of 4.63%.</em></p> <p><em>&nbsp;</em><strong><em>Keywords:</em></strong> <em>Alternative energy</em><em>, </em><em>linier permanent magnet generator</em><em>, </em><em>wave characteristics</em><em>.</em></p> Isyana Liidzilfitri, Aris Ansori ##submission.copyrightStatement## https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47371 Wed, 29 Jun 2022 00:00:00 +0000 UJI EKSPERIMENTAL PENGARUH JARAK CENTER BLADE PENGGANGGU TERHADAP DAYA DAN EFISIENSI TURBIN ANGIN SAVONIUS https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47373 <p><em>Indonesia is known as a country that is very rich in fossil energy resources and renewable energy. So far, renewable fossil energy is currently not widely used. In addition, this renewable energy (EBT) has the potential to be developed at this time, namely wind energy.</em> <em>In Indonesia, the average wind speed can range from 3 m/s-6m/s. vertical axis wind turbine is one type of turbine that can be used as renewable energy that utilizes wind energy at low speeds, but the turbine still has a weakness, lower efficiency compared to other types of wind turbines. This research was conducted to test the swirling savonius type wind turbine with the addition of a disruptive blade so that it will affect the results of its power and efficiency compared to without using a disruptive blade. The variations used are the distance of the interfering blade at the outlet with the main blade of 40 mm, the distance of the interfering blade center gap of 10 mm, 20 mm and carried out under artificial wind conditions. From the results of research, it’s explained that the center blade distance of the disturbance at a distance variation of 10 mm produces the best performance with a power of 11.91 watts at a wind speed of 6 m/s and an efficiency of 20.01044 % at a wind speed of 5.5 m.s.</em></p> <p><strong><em>Keywords </em></strong><em>: wind energy, vertical axis, savonius wind turbine and interfering blade.</em></p> Heri Kuswanto, Indra Herlamba Siregar ##submission.copyrightStatement## https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47373 Wed, 29 Jun 2022 00:00:00 +0000 ANALISIS PENGENDALIAN KUALITAS UNTUK MENGURANGI JUMLAH KANTONG PECAH PADA UNIT PACKER TUBAN 4 DENGAN METODE QUALITY CONTROL CIRCLE DI PT SEMEN INDONESIA (PERSERO) TBK https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47279 <p>Abstrak <br>Pengendalian kualitas diperlukan untuk mengurangi jumlah kantong pecah yang melebihi batas setandar di<br>PT Semen Indonesia (Persero) Tbk pada unit packer Tuban 4. Berdasarkan permasalahan diatas, maka<br>dilakukan penelitian analisis pengendalian kualitas untuk mengurangi jumlah kantong pecah pada unit<br>packer tuban 4 dengan metode quality control circle di PT Semen Indonesia (Persero) Tbk. Tujuan penelitian<br>ini; (1) untuk mengetahui pengendalian kualitas yang dilakukan dan apa saja penyebab kantong pecah pada<br>unit packer tuban 4 dengan metode quality control circle dan seven tools, (2) untuk mengetahui langkah –<br>langkah apa saja yang diambil untuk menurunkan jumlah kantong pecah pada unit packer tuban 4 dengan<br>konsep 1 siklus PDCA. Metode yang digunakan yaitu metode quality control circle. Cara pengambilan data<br>dilakukan dengan mencatat jumlah kantong release dan pecah setiap hari selama bulan April 2019. Analisis<br>data menggunakan metode deskriptif kuantitatif. Pada penelitian ini peneliti menggunakan seluruh jumlah<br>produk semen PCC 40kg pada unit packer tuban 4 sebagai populasi dan seluruh kantong pecah semen PCC<br>40kg sebagai sampel. Hasil dari penelitian dapat menurunkan jumlah prosentase kantong pecah yang terjadi<br>pada unit packer tuban 4 yang awalnya 0,28% pada bulan april 2019 menjadi 0,23% pada bulan juni 2019.<br>Dari penelitian ini dapat diketahui beberapa faktor penyebab kantong pecah yaitu faktor material mutu kertas<br>(kraft) kurang bagus, faktor lingkungan sangat berdebu dan bising, faktor metode lem yang belum kering,<br>faktor manusia kurangnya ketelitian dan pengalaman kerja dari operator baru, faktor mesin PM eror tidak<br>buang pada bc 1.<br>Kata Kunci: Analisis Pengendalian Kualitas, Quality Control Circle, PDCA, Seven Tools.</p> Eka Cita Ariftianto, Dyah Riandadari, Dyah Riandadari ##submission.copyrightStatement## https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47279 Tue, 28 Jun 2022 00:00:00 +0000 EFEK PERLAKUAN PANAS ARTIFICIAL AGING PADA AL6061 YANG DILAPISI NIKEL CHROME TERHADAP TINGKAT KEKERASAN DAN KEKUATAN TARIK https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47428 <p>Abstrak <br>Penelitian ini dilakukan untuk meningkatkan nilai kekerasan dan kekuatan tarik dari material Al-6061 paduan yang<br>akan digunakan sebagai bahan dasar pembuatan Propeller. Peningkatan kekerasan dan kekuatan material dilakukan<br>dengan cara diberi perlakuan panas artificial aging dan dilapisi nikel-krom. Penelitian ini menggunakan metode<br>eksperimen. Penelitian menggunakan paduan aluminium 6061, material dilakukan perlakuan panas artificial aging<br>190°C dengan waktu tahan 1jam, 3jam, dan 5jam. Dan dilakukan elecroplating nikel-krom. Pengujian material<br>menggunakan pengujian kekerasan rockwell Hardness Tester B dan pengujian tarik standar JIS Z2201. Berdasarkan<br>data hasil penelitian, kekerasan material terendah adalah 113,9 HRB yang diperoleh dari material tanpa perlakuan<br>artificial aging, sedangkan untuk nilai kekerasan tertinggi adalah 128,8 HRB diperoleh dari material dengan variasi<br>waktu 5 jam artificial aging. Sedangkan nilai kekuatan tarik terendah adalah 23,7 MPa yang diperoleh dari material<br>tanpa perlakuan artificial aging, sedangkan untuk nilai kekuatan tarik tertinggi adalah 27,4 MPa diperoleh dari material<br>dengan variasi waktu 5 jam artificial aging. Dari pengujian kekerasan dan uji tarik pada material diketahui bahwa<br>semakin lama waktu penahanan artificial aging maka semakin tinggi pula nilai kekerasan dan kekuatan tarik material<br>yang diperoleh.<br>Kata Kunci: Al6061, Propeller, Artificial aging, Electroplating, Kekerasan, Kekuatan Tarik.</p> Achmad Erik Firdausi, Arya Mahendra Sakti ##submission.copyrightStatement## https://ejournal.unesa.ac.id/index.php/jtm-unesa/article/view/47428 Thu, 30 Jun 2022 00:00:00 +0000