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All Journal International Journal of Applied Power Engineering (IJAPE) Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) V-MAC (Virtual of Mechanical Engineering Article) Widya Teknik
Muhamad Nur Rohman
Universitas Maarif Hasyim Latif
Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Flame Behavior During the Combustion of Premixed Kapok Oil Influenced by Oxygen and Magnetic Field Dony Perdana; Muhamad Nur Rohman; Mochammad Khoirul Rosidin; Muhaji Muhaji
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 14, No 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.92-98

Abstract

This study aimed to determine effect of oxygen enrichment and magnetic field direction on the flame behavior kapok oil combustion. Experiment was carried out to obtain flame evolution, temperature and height. Kapok oil (600 ml) was put in the boiler, and heated to 300°C. A burner chamber is placed for the reaction between kapok oil vapor with air from compressor and oxygen. Two permanent magnets of neodymium nickel grade N52 with intensity 1.1 Tesla were placed on side of burner tip. Results showed the magnetic field produce more transparent, slimmer flames with highest temperature of 679°C, lowest flames height of 5 mm. Magnetic fields produce a Lorentz force that breaks the fuel chemical chain and creates magnetic pulses in the flames. Oxygen contained in air around the burner coupled with oxygen enrichment create excessive oxidizing gas to separate and release electrons. Excessive oxygen results in a higher flame temperature due to faster combustion reaction. The magnetic fields around flames induces flow air which magnetically cause heat transfer around the flame, resulted variable flame height. This combustion produces different flame evolution, temperature, and height. Keywords: Flames behavior, Flames colour, Kapok oil, Magnetic field, Premixed combustion.
Analisis Variasi RPM Motor Listrik terhadap Variasi Dimensi Produk pada Mesin Pemotong Bakso Kotak Rohman, Muhamad Nur; Choifin, Mochamad; Herlambang, Bayu
Virtual of Mechanical Engineering Article Vol 10 No 1 (2025): V-MAC
Publisher : Prodi Teknik Mesin Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/v-mac.v10i1.4228

Abstract

In the food industry, the dough cutting process is needed to shape the dough as desired, such as square meatballs. Manual cutting of dough squares is done by cutting vertically and horizontally, but this method is time consuming. Therefore, mowers with electric motors are used for efficiency. Setting motor rpm is very important for optimal cutting results. If the rpm is too fast or slow, the results will not be appropriate. This research aims to find the right rpm range for a box meatball cutting machine. The research method was carried out by directly testing the machine at various conveyor motor rpm variations (2800, 2700, and 2600 rpm) and cutting motor variations (1400, 1350, and 1300 rpm) then measuring the dimensions of the resulting dough pieces. The research results showed that the combination of conveyor motor rpm of 2600 rpm and cutting motor rpm of 1350 rpm gave the best average cutting dimensions with a deviation value of 1 because at that rpm the conveyor and cutting knife had a speed difference that was not that big.
Analisis Pengaruh Variasi Kecepatan Motor Induksi dan Jumlah Mata Pisau terhadap Kinerja Mesin Pencacah Botol Plastik Rohman, Muhamad Nur; Hari Santoso, Rendy; Lestariningsih, Wiji
Virtual of Mechanical Engineering Article Vol 10 No 1 (2025): V-MAC
Publisher : Prodi Teknik Mesin Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/v-mac.v10i1.4229

Abstract

The aim of this research is to determine the effect of variations in motor rotation speed and the number of blades on plastic bottle chopping machines, in order to help human work in recycling plastic bottles by finding the highest level of machine effectiveness, because along with technological developments in the field of mechanical engineering, humans think about how how to make a tool that can provide convenience, comfort, environmentally friendly, and so on. This research method creates a plastic bottle chopping machine that works by cutting plastic bottles into small pieces, using a flat type AISI 420 Stainless Steel knife, and as a driver a single phase AC electric motor with a maximum speed of 1420rpm. The results of this research are regarding the effectiveness of production results from plastic bottle chopping machines. This discussion and testing aims to obtain the following data: 2 blades (800rpm=96kg/day), (1100rpm=172.8kg/day), (1420rpm=192kg/day). For 4 blades (800rpm=134kg/day), (1100rpm= 211.2kg/day), (1420rpm=2429.6kg/day). And 6 blades (800rpm=153.6kg/day), (1100rpm=230kg/day), (1420rpm=288kg/day). The results of this data and machine will certainly really help operators in increasing the effectiveness of plastic bottle chopping machines. Keywords: Blades Chopping, Machine Electric Motor, Plastic Bottle
Prediksi dan Optimasi Kekasaran Permukaan pada Proses Pemesinan Menggunakan Support Vector Regression Rohman, Muhamad Nur; Hartanti, Lusia Permata Sari; Trihardani, Luki
Widya Teknik Vol. 24 No. 2 (2025): November
Publisher : Fakultas Teknik, Universitas Katolik Widya Mandala Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/wt.v24i2.7373

Abstract

Abstract: Tuntutan terhadap efisiensi energi dan pengurangan dampak negatif lingkungan dalam proses manufaktur mendorong perlunya pendekatan yang lebih cerdas dan berkelanjutan dalam pengendalian kualitas. Studi ini bertujuan untuk membangun model prediktif berbasis Support Vector Regression (SVR) dan mengintegrasikannya dengan algoritma optimasi Equilibrium Optimizer (EO) guna memprediksi dan mengoptimalkan parameter pemesinan pada proses bubut baja AISI 1045. Pemodelan dengan SVR berbasis data eksperimen dengan tiga parameter input yaitu kecepatan potong (v), laju pemakanan (f), dan kedalaman potong (d), dan kekasaran permukaan (Ra) sebagai output. Hasil analisis ANOVA menunjukkan bahwa laju pemakanan dan kecepatan potong merupakan parameter signifikan yang mempengaruhi nilai kekasaran permukaan, sedangkan kedalaman potong tidak berpengaruh signifikan. Model SVR yang dikembangkan menunjukkan performa prediksi yang sangat baik dengan nilai Mean Absolute Percentage Error (MAPE) yang rendah dan koefisien determinasi (R²) yang tinggi, baik pada data pelatihan maupun pengujian. Validasi visual melalui scatter plot juga menunjukkan kecocokan yang sangat baik antara data prediksi dan data eksperimen. Simulasi berbasis model SVR, yang divisualisasikan melalui surface plot, tidak hanya mengonfirmasi temuan dari ANOVA tetapi juga mampu mengungkapkan interaksi tersembunyi antar parameter, seperti pengaruh simultan antara kecepatan potong dan kedalaman potong terhadap kekasaran permukaan. Optimasi lebih lanjut menggunakan kombinasi SVR-EO berhasil menemukan parameter pemesinan optimal, yakni v = 143.92 m/menit, f = 0.12 mm/rev., dan d = 0,7 mm, yang menghasilkan nilai Ra = 1,244 µm—lebih rendah dari nilai terbaik eksperimen. Hasil ini membuktikan bahwa pendekatan SVR-EO efektif untuk meningkatkan kualitas, efisiensi, dan keberlanjutan dalam proses pemesinan, serta mencerminkan nilai profesionalisme dalam penerapan teknologi cerdas untuk mendukung praktik manufaktur berkelanjutan.
Effect on saturated and unsaturated fatty acids on various vegetable oils on droplet combustion characteristic Perdana, Dony; Rohman, Muhamad Nur; Choifin, Mochamad
International Journal of Applied Power Engineering (IJAPE) Vol 14, No 4: December 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v14.i4.pp980-987

Abstract

Vegetable oils have composed of triglycerides, which one consist of 3 fatty acids combined with glycerol. Each saturated and unsaturated fatty acid has a different effect on burning characteristics. This study aimed to investigated effect of fatty acids at ceiba pentandra and jatropha oils on the flame behavior of the droplet combustion process. The combustion characteristic was observed by an ignited droplet at the junction using a thermocouple and a high-speed camera (120 fps). Results showed that a higher saturated fatty acid content resulted in long-life and steady flames. This is because more oleic and linoleic acid carbon atoms leave the droplet area and react with air. Jatropha oil produces a higher temperature of 780 °C than ceiba pentandra oil. Temperature of a vegetable oils flame is influenced by number of carbon chains, double bond, and heating value. Ceiba pentandra oil has a higher burning rate of 0.185 mm/s than jatropha oil at 0.155 mm/s. The chain content of polyunsaturated fatty acids has significant effect on rate of combustion, which is due to the weak van der Waals dispersion forces, such that heat absorption is more active and energetic. The highest flame height for ceiba pentandra oil is 55.03 mm compared to for jatropha oil it is 46.82 mm. Long-chain unsaturated double bonds and glycerol cause micro-explosions. This micro-explosion caused the shape of the flame to split and expand so that evaporation occurred faster, thus increasing the size of the flame.
Co-Authors Choifin, Mochamad Dony Perdana Hari Santoso, Rendy Hartanti, Lusia Permata Sari Herlambang, Bayu Lestariningsih, Wiji Mochammad Khoirul Rosidin Muhaji Muhaji Trihardani, Luki