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All Journal Teknika AUSTENIT Jurnal Teknik Mesin Jurnal Sains dan Teknologi Jurnal Penelitian Rumpun Ilmu Teknik Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Jupiter: Publikasi Ilmu Keteknikan Industri, Teknik Elektro dan Informatika
Romli Romli
Politeknik Negeri Sriwijaya
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Dentistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Public Health Veterinary

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Pengaruh Fraksi Volume dan Orientasi Serat Pada Komposit Hibrid Berpenguat Serat Gambas serta Eceng Gondok Terhadap Kekuatan Bending Rizki Ramadoni; firdaus firdaus; Romli Romli; Sailon Sailon; A. Pramudya AFG; Muhammad Nugraha
Jurnal Teknik Mesin Vol 15 No 2 (2022): Jurnal Teknik Mesin
Publisher : Politeknik Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30630/jtm.15.2.891

Abstract

Wood is increasingly difficult to obtain due to the use of excess wood. Many efforts were made to replace wood, one of which was composite material. This study aims to determine the most optimal bending strength with the influence of variations in volume fractions and fiber orientation in hybrid composites with luffa fibers and hyacinth fibers. In making composites using the hand lay-up method with alaklization treatment on gambas and hyacinth fibers using 5% NaOH which is varied with the volume fraction used in this study with the ratio of resin: hyacinth: gambas is (60%:20% :20%),(70%:15%:15%), as well as (80% :10%:10%) and the orientation of the fibers with the arrangement of the luffa / hyacinth / luffa layer is (0°/ 45 °/ 90°), (0˚/45˚/0˚), (90˚/0˚/90˚). Bending testing was performed with ASTM D790 standard and hypothesis testing using the two-way ANOVA method. From the results of bending testing, the most optimal strength value was found, which was 43.33 N / mm2, where the value was not higher than the bending strength value in the multiplex, which was 17.53 N / mm2. Meanwhile, the results of hypothesis testing are that there is an influence on the volume fraction factor, the direction of fiber orientation and the interaction with bending forces.
Peningkatan Efisiensi Produksi Briket Batok Kelapa Menggunakan Mesin Cetak Kapasitas 10kg Baiti Hidayati; M. Rasid; Herlin Sumarna; Romli Romli; Aji Pangestu Wijaya
INSOLOGI: Jurnal Sains dan Teknologi Vol. 5 No. 2 (2026): April 2026
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v5i2.8091

Abstract

Manual production of coconut shell briquettes in small and medium-scale industries often faces limitations in productivity, product uniformity, and dependence on human labor. This study aimed to evaluate the efficiency improvement of coconut shell briquette production through the use of a 10 kg-capacity briquetting machine. An experimental method was applied by comparing mechanical briquetting and manual hand-pressing using the same raw material composition, namely 7 kg of coconut shell charcoal powder, 3 kg of tapioca starch adhesive, and 1 liter of water as a mixing aid. The observed parameters included production capacity, production time, physical quality score, quality consistency, and electrical energy consumption. The results showed that the machine produced 10 kg of briquettes in 1 hour, whereas the manual method produced approximately 3.3 kg per hour and required about 3 hours to reach the same production quantity. The machine increased production capacity by approximately 200% and reduced production time by approximately 67%. The physical quality score increased from 70% to 85%, while quality consistency increased from 80% to 95%. Although the machine consumed 0.5 kWh per process, the energy requirement was relatively low, equivalent to 0.05 kWh/kg of briquettes. These findings indicate that the 10 kg-capacity briquetting machine is feasible as an appropriate technology to improve productivity and product uniformity for small and medium-scale coconut shell briquette producers.
PENGEMBANGAN MESIN PEMBUAT BRIKET BATOK KELAPA KAPASITAS 10 KG SEBAGAI UPAYA MENINGKATKAN EFISIENSI PRODUKSI PADA KELOMPOK TANI DI LALAN, KABUPATEN MUSI BANYUASIN M. Rasid; Baiti Hidayati; Herlin Sumarna; Romli Romli; Aji Pangestu Wijaya; Labib Ghinatajaya
AUSTENIT Vol. 17 No. 2 (2025): AUSTENIT: Oktober 2025
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36257/austenit.v17i2.11420

Abstract

Charcoal briquettes are an environmentally friendly alternative energy source; however, conventional production is hampered by the slow and labor-intensive manual molding process. This study aims to improve production efficiency for farmers in Lalan, Musi Banyuasin, by designing and testing a screw-type charcoal briquette press machine powered by an electric motor. The machine is designed with a capacity of 10 kg per cycle, using coconut shell charcoal powder as the test material. The research methods include the design, fabrication, and performance testing through a comparative study of the machine and manual molding processes, as well as product uniformity evaluation. The results show a significant increase in production rate. The screw machine is able to produce an average of 24 briquettes in 50 seconds, while the manual method only produces 5 briquettes in the same time, indicating an approximately 4.8-fold increase in output. The machine's measured capacity reaches 32.29 kg/hour under extended testing conditions, and the briquettes produced are uniform according to the mold. Based on the test results, the machine demonstrates greater efficiency as the molding time increases, with a total output of 144 briquettes in 300 seconds, while the manual method only produces 30 briquettes in the same time. This study concludes that the implementation of the screw-type briquette press machine effectively accelerates the production process, reduces reliance on manual labor, and has the potential to increase the economic value of biomass waste for small- to medium-scale enterprises.
Studi Eksperimental Vibrator Shaft pada Mesin Pressure Leaf Filter di Kernel Crushing Plant PT. Hindoli Mill Sungai Lilin David Chandra; Taufikurrahman Taufikurrahman; Ella Sundari; Romli Romli; Rizky Berlian; Syafei Syafei
TEKNIKA Vol. 19 No. 2 (2025): TEKNIKA
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.15030262

Abstract

Mesin pressure leaf filter dengan model PLF 38-1380/1350-15 yang ada di PT. Hindoli Mill Sungai Lilin memiliki masalah kerusakan pada vibrator shaft yang terjadi akibat beban kejut yang terlalu besar. Penelitian ini bertujuan mengganti material yang digunakan pada vibrator shaft lama dan dilakukan pengujian komposisi, uji impak, dan uji tarik. Nilai yang diperoleh dari penelitian ini adalah spesifikasi vibrator shaft lama menggunakan material Stainless Steel SS304 dan vibrator shaft baru menggunakan material Baja AISI-1070. Hasil uji tarik vibrator shaft baru material Baja AISI-1070 dengan nilai rata-rata ultimate tensile strength 527,955 N/mm2. Hasil uji impak vibrator shaft baru material Baja AISI-1070 dengan rata-rata nilai impak 3,614 J/mm2 jauh lebih kuat dibandingkan vibrator shaft lama material Stainless Steel SS304 dengan rata-rata nilai impak 0,548 J/mm2.
Analisa Desain Dan Optimasi Topologi Roda Gigi Transportir Pada Mesin Bubut Maximat V13 Ichsanul Hakim; Taufikurrahman Taufikurrahman; Ella Sundari; Romli Romli; Indra Gunawan
TEKNIKA Vol. 19 No. 2 (2025): TEKNIKA
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.15522587

Abstract

Mesin bubut dengan merk maximat bertipe v13 yang ada pada bengkel produksi teknik mesin Politeknik Negeri Sriwijaya memiliki masalah yang sering terjadi, yakni kerusakan pada roda gigi transportir yang mana akan menghambat kegiatan praktikum untuk mahasiswa di Politeknik Negeri Sriwijaya. Dengan latar belakang tersebut maka dibuatnya penelitian ini dengan tujuan agar hasil optimasi topologi yang berfokus pada optimasi penggunaan dan pemilihan material dengan mempertimbangkan kemampuan tegangan pada roda gigi dengan simulasi yang dilakukan di Solidworks sehingga mendapatkan nilai tegangan, displacement, dan safety factor pada roda gigi tranportir. Hasil yang didapat dari penelitian ini ialah rekomendasi desain hasil optimasi topologi dengan konsep yang kedua, yakni dengan nilai tegangan sebesar 1,315e+01 N/mm2 , displacement 2,141e-03 mm, dan safety factor dengan nilai 3. Dengan adanya penelitian ini, dapat menjadi acuan untuk rancangan dalam pembuatan roda gigi transportir yang lebih baik dari roda gigi transportir sebelumnya.
Pengaruh Variasi Jarak Celah Roll dan Ketebalan Perak terhadap Kekasaran Permukaan pada Proses Rolling Press Perhiasan M Aidil Ikhsan; Romli Romli; Yogi Eka Fernandes
Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan Vol. 4 No. 4 (2026): November: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/globe.v4i4.1734

Abstract

This study aims to analyze the effect of variations in roll gap distance and silver thickness on surface roughness in  the cold rolling process  using  jewelry rolling press, as well as compare the rolling results with manual drive systems and electric motors. The study used an experimental method with sterling silver materials with an initial thickness of 2 mm and 1 mm. At a thickness of 2 mm, roll gaps of 1.7 mm, 1.5 mm, and 1 mm were used, while at a thickness of 1 mm, 0.5 mm, and 0.3 mm gaps were used. The surface roughness was measured using the Surface Roughness Tester three times in each specimen and calculated as a Ra value (Roughness Average). The results showed that the variation in the spacing of the roll slit affected the roughness of the surface, but the change in the Ra value did not show a linear relationship. The change in roughness was related to the deformation of the plastic, the contact pressure between the roll and the material, and the roughness of the transfer during the rolling process. The use of an electric motor produces a more stable roll rotation so that the surface quality tends to be more uniform than that of the manual system. So that the regulation of the roll gap distance and material thickness are important parameters in producing silver surface quality according to the needs  of the jewelry rolling press process.
Studi Eksperimental Getaran Mesin Bubut Celtic 14 Berdasarkan Variasi Kecepatan Putar dan Kedalaman Pemotongan Mohammad Luthfi Hussain; Romli Romli; Yogi Eka Fernandes
Jurnal Penelitian Rumpun Ilmu Teknik Vol. 5 No. 4 (2026): Jurnal Penelitian Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juprit.v5i4.7169

Abstract

This study aims to analyze the effect of spindle rotation variations  and feeding depth on vibration in Celtic 14 lathes. The study used an experimental method with three rotation variations, namely 290 rpm, 460 rpm, and 515 rpm, as well as feeding depths of 0.5 mm, 1.0 mm, and 1.5 mm. Vibration measurement was carried out using a vibration meter in the vertical and horizontal directions. Each combination of parameters was carried out three times for 5 seconds and then the average value was calculated. The results showed the highest vertical vibration of 5.03 mm/s at 515 rpm and a depth of 1.0 mm, while the highest horizontal vibration was 4.20 mm/s at 515 rpm and a depth of 1.5 mm. The lowest values are 0.40 mm/s in the vertical direction at 290 rpm and 0.5 mm and 0.23 mm/s in the horizontal direction at 460 rpm and 0.5 mm, respectively. Based on the ISO 10816 classification, the maximum vertical values include zone C and horizontal zone B. High rotation tends to increase vibration, while small depth results in more stable turning.
Analisis Gesekan Pelat Luncur Tanam Padi pada Media Lumpur Menggunakan Simulasi CFD Eval Kurniawan; Romli Romli; Yogi Eka Fernandes
Jupiter: Publikasi Ilmu Keteknikan Industri, Teknik Elektro dan Informatika Vol. 4 No. 6 (2026): November : Jupiter: Publikasi Ilmu Keteknikan Industri, Teknik Elektro dan Info
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupiter.v4i6.1733

Abstract

Penelitian ini bertujuan untuk menganalisis gesekan pada pelat geser dasar alat tanam padi yang berinteraksi dengan media lumpur menggunakan metode Computational Fluid Dynamics (CFD). Analisis dilakukan untuk menentukan pengaruh karakteristik lumpur terhadap distribusi gaya gesekan (tegangan geser dinding) dan gaya hambat pada pelat geser. Simulasi menggunakan perangkat lunak ANSYS Fluent 2021 R1 dengan lima variasi parameter lumpur, termasuk densitas 1000-1300 kg/m³ , viskositas 5-60 Pa·s, dan tegangan luluh 50-300 Pa. Hasil simulasi dianalisis berdasarkan distribusi tekanan, gaya gesekan, dan gaya hambat pada setiap kondisi lumpur. Hasil menunjukkan bahwa karakteristik lumpur memengaruhi gaya yang bekerja pada pelat geser dasar. Pada densitas 1000 kg/m³ , viskositas 5 Pa·s, dan tegangan luluh 50 Pa, diperoleh gaya gesekan sebesar 2.727 Pa dan gaya resistensi sebesar 42.325 N. Sementara itu, pada densitas 1300 kg/m³ , viskositas 60 Pa·s, dan tegangan luluh 300 Pa·s, diperoleh gaya gesekan tertinggi sebesar 146.125 Pa dan gaya resistensi sebesar 211.967 N. Peningkatan karakteristik lumpur meningkatkan hambatan aliran dan gaya yang harus diatasi oleh alat.
Pengaruh Variasi Berat Serabut Buah Kelapa Sawit Terhadap Sifat Mekanik Pada Material Papan Panel Komposit Dalfinta Nadya Salsabilla; Taufikurrahman Taufikurrahman; Didi Suryana; Romli Romli; Syafei Syafei
TEKNIKA Vol. 19 No. 1 (2025): TEKNIKA
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.14562745

Abstract

Penelitian ini mengkaji pengaruh variasi berat serabut buah kelapa sawit terhadap sifat mekanik material papan panel komposit. Penelitian ini bertujuan untuk mengetahui kekuatan material komposit yang berpenguat serat kelapa sawit saat uji tarik dan untuk mengetahui pengaruh penambahan serat serabut pada material komposit. Serabut buah kelapa sawit digunakan sebagai penguat dalam komposit resin dengan tiga variasi komposisi fraksi volume: 40% : 60%, 30% : 70%, dan 20% : 80%. Hasil pengujian menunjukkan bahwa komposisi 40% serabut dan 60% resin menghasilkan kekuatan tarik rata-rata tertinggi sebesar 22,345 MPa, sedangkan komposisi 30% : 70% dan 20% : 80% masing-masing menghasilkan kekuatan tarik rata-rata sebesar 10,95 MPa dan 6,37 MPa. Analisis data penelitian menggunakan ANOVA single factor menghasilkan penambahan berat serabut dalam komposit memiliki pengaruh signifikan terhadap sifat mekanik material. Penelitian ini memberikan wawasan penting tentang optimasi komposisi serabut dan resin untuk menghasilkan material komposit dengan performa mekanik yang optimal.
Co-Authors A. Pramudya AFG Aji Pangestu Wijaya Baiti Hidayati Dalfinta Nadya Salsabilla David Chandra Didi Suryana Ella Sundari Eval Kurniawan Firdaus Firdaus Herlin Sumarna Ichsanul Hakim Indra Gunawan Labib Ghinatajaya M Aidil Ikhsan M. Rasid Mohammad Luthfi Hussain Muhammad Nugraha Rizki Ramadoni Rizky Berlian Sailon Sailon Syafei Syafei Taufikurrahman Taufikurrahman Yogi Eka Fernandes