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Jurnal Rekayasa Material, Manufaktur & Energi
Published by Universitas Muhammadiyah Sumatera Utara
ISSN : 26227398     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Aerospace Engineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering
Jurnal Rekayasa Material, Manufaktur & Energi, yang diterbitkan oleh Fakultas Teknik, Program Studi Teknik Mesin, Universitas Muhammadiyah Sumatera Utara (UMSU), Medan, Sumatera Utara, Indonesia, Jurnal Rekayasa Material, Manufaktur & Energi menerima artikel ilmiah hasil-hasil penelitian, dan eksperimen, yang mencakup pada bidang Rekayasa Material, Manufaktur dan Energi, Mesin, dan ilmu yang relevan pada sektor terkait.
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Articles 24 Documents
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Search results for , issue "Vol 8, No 1: Januari 2025" : 24 Documents clear
Analisis Sifat Serat Tandan Kosong Kelapa Sawit Sebagai Material Akustik : Jurnal Review Syabani, Nabilah A; Aritonang, Sovian
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21750

Abstract

Oil palm empty fruit bunch (EFB) fiber is an agricultural waste that has potential as an environmentally friendly acoustic material. The high cellulose and hemicellulose content in TKKS plays a role in its ability to absorb sound, making it a more sustainable alternative to synthetic materials. This research aims to summarize and analyze studies related to the acoustic characteristics of TKKS, fiber processing, and the value of the sound absorption coefficient produced at various frequencies. The methods used in processing acoustic composites made from TKKS include mixing with polyester resin and hand lay-up techniques. The results of the analysis show that the TKKS composite material has good sound absorption capability at low to medium frequencies, with an absorption coefficient that meets the ISO 11654 standard. In addition, this study identified variables such as fiber length, composite thickness, and chemical treatment as important factors in optimizing the acoustic performance of TKKS. The results of this review are expected to provide insights for the utilization of TKKS as a sustainable acoustic material solution in the construction and soundproofing industries.
Analisa Kerusakan Thrust Bearing Turbin Pengaruh Kinerja Pelumas Di Pltu Pt. Pln Np Up Belawan Mayrini, Irin; Abdilah, Tomi; ., Supriadi
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21522

Abstract

The function of lubricants for combustion engine technology and energy conversion machines is very important. It is like a human body without blood will experience death. Steam turbines are a source of electrical energy that can produce large amounts of electrical power. Steam turbines can work well with a number of components needed, including a lubrication system. When the turbine rotates, friction occurs between the bearings and the generator, so to minimize friction and wear, lubricants are needed. Lubricants not only function to prevent wear and tear but also function to transfer heat, remove dirt and cool turbine and generator bearings. A good lubrication system will greatly influence the working reliability of the steam turbine with optimal electrical power production results. On the other hand, if the turbine lubricant system does not work optimally, friction and wear will occur and cause corrosion which will result in damage to the steam turbine thrust bearing components. The research method used is qualitative research, namely data collection through field observations, interviews, lubricant tests in the laboratory and bibliography. The conclusion of this research: the reason the steam turbine lubrication system is not optimal is that the lubricant is contaminated with solid and liquid particles, especially water contamination. This is based on the results of lubricant analysis in the tribology laboratory on November 6 2023 with a lubricant usage period of 11,775 km and water contamination in the lubricant of 4,202 ppm. This figure exceeds the minimum threshold of 200 ppm. Then the next sampling on December 9 2023 with a lubricant usage period of 12,495 Km found water content contamination of 1,064 ppm. And then for the last sampling on July 23 2024 with a lubricant usage period of 16,815 km, water content contamination was still found at 1,165 ppm. After further inspection by the maintenance team in the field, it was found that the source of the water contamination problem came from a leak in the steam turbine gland because the seal strip had over-clearance due to its long life time. This causes some of the turbine steam to enter the lubricant in the bearing. This damage will be repaired during the Major Overhaul because the turbine must be dismantled. A temporary solution, a separator is installed continuously to separate oil and water.
Rekayasa Alat Pendeteksi Kebocoran Gas Berbasis Arduino Uno Dengan Sensor MQ-2 Pada Regulator LPG ., Rahmatullah; Umurani, Khairul; Amiruddin, Arfis; Kurniawan, Wahyu; Siregar, Ahmad Marabdi
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21983

Abstract

The engineering of an Arduino Uno-based gas leak detection device with an MQ-2 sensor was created to optimize security against gas leaks that occur. The public must know the signs of a leak, such as smelling gas, a hissing sound in the gas line and so on. The aim of engineering this tool is to create an Arduino Uno-based gas leak detection tool that uses the MQ-2 sensor on the LPG regulator. Gas leaks can cause risks such as fire and explosion, so it is important to have a gas detection system. When the sensor detects the presence of gas, the system will trigger a buzzer to provide an audible alarm and turn on the LED light as a visual indicator. The LCD will display the detection status with clear text, namely "Leak Danger" when gas is detected, and "Safe" when there is no leak. The test was carried out using a 3 kg LPG gas cylinder, with the results showing that the MQ-2 sensor could detect gas within 3 seconds. The results of this test prove that the tool developed is able to provide a fast response to gas leaks, so it can be a solution to increase the safety of LPG use.
Kekuatan Tarik dan Impak Komposit Matrik Polimer Serat Kulit Durian dengan Variasi Perlakuan Alkalisasi (NaOH, NaOH+H2O2, dan KOH) Serat badri, muftil; Chaerunissa, Andini; Dalil, M.; Saputra, Sukemi Indra
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21237

Abstract

Durian fruit is one of the most popular fruits in Indonesia. Half of the durian fruit is the peel, which produces a lot of waste. The durian peel is not useful and also has no economic value. Durian peel contains fibers that have the potential to be utilized. The utilization of durian peel fiber as a composite natural fiber is an effort to reduce waste from the peels. Improvement of the properties of durian peel fibers can be applied by alkali treatment of the fibers. The purpose of this study is to obtain the cellulose content, tensile strength and impact toughness of durian peel fiber reinforced polymer composites by varying the alkali treatment of the fibers. The volume fraction of fiber and matrix composite was used 50:50. This study varied 0% alkali, fiber alkali as follows: 5% NaOH, 5% NaOH + 3% H2O2, 5% KOH. The results showed the highest cellulose content of 59.48% in the 5% NaOH + 3% H2O2 treatment. It was found that the optimum tensile strength was 8.58 MPa in the 5% NaOH + 3% H2O2 fiber treatment. The highest impact toughness of 2.8 kJ/m2 was obtained in 0% alkali treatment of fiber composite.
Perancangan Cetakan Batu Bata Dengan Metode Pahl And Beitz Pasaribu, Rismauli Novianty; Silviana, Nukhe Andri; Siregar, Ninny; ., Susilawati
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.17866

Abstract

Along with the development of technological products that can provide comfort and convenience for human life which will depend on the innovation of more complex product functions for consumers that will continue to be used, therefore it is necessary to design lightweight brick molds that are ergonomic and able to meet customer demands. The design of the lightweight brick mold was carried out using the Pahl and Beitz method by applying the REBA (Rapid Entire Body Assessment) method for proposed improvements by evaluating the worker's overall posture. The aim of this research is to produce an ergonomic design that is able to meet every customer request. The results of the research showed that measurements of work posture carried out by light brick workers had to take corrective action because it showed level 10, which means it was at level 4 (dangerous conditions). By reducing dangerous angles on body parts, a better working body posture is obtained with a REBA score of 3 which is included in risk level 2 (Low risk) based on worker anthropometric processing where each data is sufficient and uniform, so that a lightweight brick mold design can be produced. reduces the risk of injury to musculoskeletal disorders for workers with dimensions of mold length 100 cm, width 51.27 cm, mold height 60 cm, mold handle length 29 cm, mold handle width 9 cm
Karakteristik Penyalaan Droplet Minyak Biji Bunga Matahari Dengan Penambahan Karbon Aktif Kulit Pinang Ulwan, Abdullah; Riupassa, Helen; Mini, Marthina; Suyatno, Suyatno
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.22248

Abstract

This study aims to reveal the role of biocatalysts based on activated biocarbon from areca nut shell waste in improving the ignition performance of sunflower seed oil droplets as an alternative fuel. Sunflower seed oil, which is rich in unsaturated fatty acids, has strong intermolecular binding forces that slow down its ignition. To overcome this, biocatalysts from activated areca nut shells were used. FTIR analysis showed an increase in the ability of fuel molecules to absorb heat, while TEM studies revealed that biocarbons have high porosity and uniform particle distribution, which supports combustion efficiency. Observations of temperature and droplet evolution using thermocouples and high-speed microscope cameras showed a significant increase in the ignition rate. The results indicate that this biocatalyst not only improves ignition efficiency but also utilizes organic waste, making it an environmentally friendly and sustainable fuel solution.
Optimasi Sifat Biofiber Sisal Melalui Modifikasi Dengan Impregnasi Dan Asam Stearat Untuk Aplikasi Biokomposit Desiasni, Rita; Izzati, Nurul; ., Sukarsih; Riski, Muhammad
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21758

Abstract

This research aims to optimize the properties of biofiber made from sisal fiber through modification with stearic acid. Sisal fiber is known to have high potential as a natural raw material, but its mechanical properties still need to be improved for wider industrial applications. The modification process is carried out by soaking the sisal fiber in a stearic acid solution with varying concentrations.  Laboratory tests were carried out to evaluate the effectiveness of modifying the physical properties of sisal biofiber in the form of 1 cm short fiber fibers and 200 mesh sisal powder to determine the most effective modification between the two fiber sizes. Based on the results obtained, the highest cellulose, namely 64.7%, was obtained from the results of impregnation of the fiber. The lignin content decreased in impregnated sisal fiber to 9.2% from 12.48% without treatment. The results of NDF which produce cellulose and lignin levels are strengthened by SEM results on 4% sisal fiber. These results show that the sisal fiber without stearic acid treatment shows a greater distribution of lignin compared to the sisal fiber treated with 4% stearic acid.
Pemanfaatan Ekstrak Spirulina Platens Sebagai Bio-Material Kamuflase Multifungsi Untuk Samaran TNI Yang Melindungi Kulit Dari Radiasi, Panas, Dan Kondisi Lingkungan Ekstrem Azza, Athira; Aritonang, Sovian
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.17083

Abstract

Spirulina platensis is a species of microalgae from the cyanobacteria group known for its high nutritional value and extensive health benefits. This microalgae is spiral or helical in shape and bluish green in color due to its phycocyanin content, a protein pigment that also has antioxidant properties. Spirulina platensis is often used as a food supplement because of its high protein content, reaching 50-70%, and contains vitamins, minerals, and essential fatty acids that support health. This study developed a peel-off gel mask from Spirulina platensis extract with Polyvinyl Alcohol (PVA) and Hydroxypropyl Methylcellulose (DMC) as gelling agents in various compositions. Formulas with a ratio of PVA 2.25%: DMC 1.25% (formula A) and PVA 2.00%: DMC 1.05% (formula B) showed good physical stability, including pH close to skin pH, viscosity, and ideal drying time. These results show the potential of Spirulina platensis as a multifunctional camouflage material that can protect the skin from UV radiation and extreme environmental conditions.
Karakterisasi Dan Aktivitas Fotokatalitik Green Synthesized Nanokomposit Fe3O4/TiO2 Menggunakan Ekstrak Daun Kelor Untuk Degradasi Methylene Blue Br Situmorang, Dinda Agelia; Lubis, Ridwan Yusuf; Husnah, Miftahul
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21753

Abstract

This research focuses on Fe3O4/TiO2 nanocomposites (produced through green synthesis) using moringa leaf extract to degrade methylene blue. The coprecipitation synthesis method was successfully employed to synthesize Fe3O4/TiO2. The aim of this study is to evaluate the effects of characterization results and photocatalytic activity on morphological structure, crystal size, and methylene blue degradation percentage. To assess these parameters, the study compared different mass composition ratios: 2:1, 1:1, and 1:2. The samples were characterized using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), and UV-Vis Spectrophotometry.SEM results indicated that agglomeration occurred in the 1:2 mass ratio variation. XRD analysis showed that as the mass ratio increased, the crystal size decreased, with crystal sizes recorded at 30.71 nm, 28.38 nm, and 28.59 nm. UV-Vis results demonstrated that higher mass ratios corresponded to higher degradation percentages, reaching up to 97.80% for the FTMO1:2 sample.
PENGARUH KARBON AKTIF DAN SODIUM ALGINAT TERHADAP PENURUNAN KADAR GLIFOSAT TANAH TERCEMAR RESIDU PESTISIDA Sucitawati, Nopita; Daulay, Abdul Halim; Husnah, Miftahul
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.21507

Abstract

The widespread use of pesticides has led to soil contamination, one of which is caused by glyphosate residues. This study aims to examine the influence of activated carbon and sodium alginate on reducing glyphosate levels in contaminated soil. Various compositions of coconut shell-based activated carbon and sodium alginate were applied to soil samples to determine the effectiveness of glyphosate reduction. The results showed that the combination of these two materials significantly contributed to lowering glyphosate levels. Surface morphology characterization of the activated carbon using Scanning Electron Microscope (SEM) revealed that the pores and surface structure of the activated carbon play a crucial role in glyphosate adsorption. Activated carbon samples with sodium alginate variations demonstrated increased efficiency in pesticide residue absorption, particularly in samples with ratios of 100%:0%, 90%:10%, and 80%:20%. These findings confirm that activated carbon and sodium alginate are effective in reducing glyphosate levels, with the activated carbon’s morphology supporting optimal adsorption.

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