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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 230 Documents
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Perpindahan Panas dan Penurunan Tekanan Pada Plat Rata Dengan Media Berpori (Porous) Umurani, Khairul; ., Rahmatullah; Siregar, Ahmad Marabdi; Nasution, Arya Rudi; Pratama, Riza Fauzi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13598

Abstract

Convection heat transfer rate on a flat plate with a certain temperature can be increased by increasing the average heat transfer coefficient, increasing the surface area of heat transfer or both. In this study, stones and marbles were used as specimens of porous media with a diameter of 15 mm with a rock porosity of 43.8%, and marbles of 50.3% which were packed on a flat plate and tested in a rectangular air channel with an air velocity of 1 m /. s, 2 m / s, 3 m / s, 4 m / s, 5 m / s. Take experimental measurements on a heater set at 220 V. After steady conditions are established, record the temperature on the flat plate and the ambient air temperature. The highest Nusselt number occurs on flat plates with rock specimens of 69.025 and the highest convection heat transfer occurs on flat plates without porous media at 44.98 Watt, while convection heat transfer on flat plates with rock-porous media is lower than flat plates with porous media marbles. The friction factor decreases as the Reynold number increases. The greater the Reynold number, Nusselt number and the Convection heat transfer, followed by a decrease in the friction factor
Analisa Konstruksi Mesin Bubut Duplikat Untuk Profil Kayu Dengan Ukuran Kayu Diameter 15 Cm Dan Panjang 50 Cm Setiawan, Bambang; Hidayat, Gunawan; Djunaedi, Thomas
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13440

Abstract

In desaining wood profile lathes, the quality and strength are calculated by analyzing various loads that occur in the lathes and choosing suitable materials to be used in the manufacture of lathes, the materials used are 40 X 40 mm hollow beam type AISI 304 with tensile strength 6 x 108 N / m2, mudulus elasticity 1.9 X 1011 N / m2, performed to calculate the distribution of the load received by the rangkan of 757 N and done to get the results close to the original as a reference for making the lathe frame duplicate the wood profile. To do the simulation, solidwork software is needed as a means to DESAIN and DESAIN the lathe frame strength duplicate the wood profile. Manual calculation results are compared with finite element analysis (FEA) simulations. Strength analysis in the frame is obtained 3.9 X 107 N / mm2, the deflection that occurs is 0.08 mm.
Pengaruh Ketebalan Core Komposit Sandiwch Berpenguat Serat Pelepah Pisang-Kayu Jati untuk Aplikasi Partisi Peredam Suara pada Kamar Mesin Kapal Indrawan, Rizal; Prasaja, Sasti
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13676

Abstract

Natural fiber composites are one of the innovative materials in an effort to solve the waste problem. Banana midrib and sawdust are plantation and forestry wastes whose utilization is very minimal. This research was conducted to make sandwich composites reinforced with banana midrib fiber and sawdust which is intended to be able to replace glasswool to reduce noise in the engine control room. The use of glasswool is not good for health which if the particles are inhaled it causes respiratory problems. The thickness of the core in the sandwich composite was varied by 2, 4, and 6 mm. Sound absorption testing is carried out according to the ASTM E1050-19 standard. The hand lay up method and polyester resin were used to make natural fiber sandwich composites. The highest sound absorption coefficient on specimens 2-35 is 0.77. All specimens of sandwich composites produced in this study met the requirements for sound absorption installations in buildings (ɑ = 0.15). Along with the addition of the volume fraction reinforced on the core gives a parabolic effect with the addition of 35% giving the best results at thicknesses of 2 and 6 mm. The thinner the core provides a better sound absorption coefficient than other thicknesses.
Studi Pengaruh Titik Penambahan Sodium Isobutyl Xanthate (SIBX) dan Kecepatan Impeller pada Performa Flotasi Mineral Tembaga Oktikawati, Anjar; Nugraha, Cahyo Ady; Soedarsono, Johny Wahyuadi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.12650

Abstract

Evaluation of the use of the SIBX addition point and energy consumption in a flotation machine is an optimization effort to increase recovery in a valuable mineral separation process. The purpose of this study was to maximize the use of reagents and energy consumption in flotation machines by looking for the effect of the SIBX addition point and impeller speed variations on copper recovery. In the experiments, the authors vary the impeller speed and the SIBX addition points. The impeller speed is varied into five different speeds. While the SIBX addition point into four different points. From the variation of the experiment, the test must be done within 20 flotation kinetics. Those tests were performed for 8 minutes and will generate 4 concentrates and tailings. From this information, a graph of the relationship between recovery and time is obtained, and it can be seen that the point of adding SIBX and impeller speed is to produce optimal recovery values. From the available tailings and feed, an analysis of particle size and distribution is also carried out to check the effectiveness of changing the impeller speed pattern to provide kinetic energy for particles of various sizes to collide with air bubbles and increase the probability of collection of valuable minerals, so that high recovery is obtained in various areas. particle size. Of all the speed variations used in the impeller, the best kinetic recovery comes from the addition of SBX in the 0 min, 2 min, and 4 min. While the worst comes from the addition in the 6 min. Copper kinetic recovery is only affected by the nature and amount of hydrophobic particles but is not affected by impeller speed. Copper recovery at each end of the experiment showed the same value which is an average of about 94%.
Analisis Pengaruh Campuran Bioaditif Cengkeh Pada Bahan Bakar Pertalite Terhadap Performa Mesin Motor 4 Tak Hermanto, Tino; Pratama, Wahyu; Idris, Muhammad; ., Rahmatullah
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13597

Abstract

Bio additives are substances from nature that are combined with other substances to perform specific tasks, such as lowering exhaust emissions, preventing corrosion, and increasing engine efficiency. Therefore, the purpose of this study was to determine how the effect of adding bio additives to pertalite fuel on the performance of a 4 TAK motorcycle engine. Clove oil is the bioadditive used in this study. The experimental strategy was used in this study to approach the research by reading books and magazines. This research was conducted at PT. Indako Trading which is located in Siti Rejo I, Kec. Medan City, Jl. Sisingamangaraja No. 362, Medan City, North Sumatra 20144. In this experiment, different ratios of pertalite and bio additive fuels were used, including pure pertalite fuel 2:1000 ml, 5:1000 ml, 10:1000 ml, and 1000 ml. From the results of the tests carried out in this study, there was an increase in the power and torque values of the motorcycle, with the highest power and torque values of 0.4 kW and 0.4 Nm, respectively, in the comparison of variations in the mixture of bioadditives and pertalite of 5:1000 ml and 1000 ml of pure pertalite.
Analisis Karakteristik Bahan Tembaga Akibat Pengaruh Proses Penempaan Terhadap Kekuatan Impak Siahaan, Muhammad Yusuf Rahmansyah; Siregar, Rakhmad Arief; Tanjung, Faisal Amri; Saktiawan, Agung
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13709

Abstract

Indonesia is one of the countries with the largest copper reserves in the world, namely the Tembagapura area, Mimika Regency, Papua Province. The development of electric car technology has a significant impact on increasing the demand for copper. This study conducted material engineering on copper materials with the forging process. The aim of the research was to obtain the average impact energy, average impact strength, and fracture shape of the material from a variety of copper materials. The variation of each test specimen was formed following the ASTM E23 standard with a size specification of 55 mmL x 10 mmW x 8 mmT. The experimental study of impact testing by the charpy method yielded an average impact energy value of 169.081 Joule and 98.058 Joule respectively for copper variations X1 and X2. The average impact strength values produced by the copper variations X1 and X2 are 2.114 J/mm2 and 1.226 J/mm2 respectively. The results of physical observations of the two variations of the copper material show that the material is not broken with fibrous fractures. The data from the test results can be declared that the forging process with hot working has an effect on increasing material characteristics by 58% and copper materials are classified as ductile materials.
Penerapan Unsur Tanah Jarang pada Struktur Rangka Persenjataan Militer (Kasus Struktur Rangka F-35 Lightning II) Setiawan, Rudi; Aritonang, Sovian; Andreas N, R Djoko; Juhana, Riyadi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.12627

Abstract

The rare earth element (REE) is not a free metal element or an individual pure mineral, generally in the form of compounds. To obtain rare earth element is done by extraction that requires modern technology with expensive costs. The use of REE is very important for the development of industry and modern technology. Seeing the potential and rapidly developing technology, the Rare Earth Metal in developed countries is currently being used as a mixture of materials in the manufacture of weapons. This journal will discuss the use of rare earth element for the F-35 Lightning II fighter. REE used in F-35 is a mixture for composite Graphite/Epoxy and Graphite/Bismaleimide, as elements Rhenium, Samarium, and Tantalum. This compost is used on the fuselage structure as an example for the Fuselage Center. The results of these alloys can increase aircraft performance, which is resistant to high temperatures, resistant to high pressure, and cannot be detected by radar (stealth). But also before being applied it needs accurate analysis of the negative impacts if the composites are implemented
Analisis Heatmap Korelasi dan Scatterplot untuk Mengidentifikasi Faktor-Faktor yang Mempengaruhi Pelabelan AC efisiensi Energi Leni, Desmarita; ., Muchlisinalahuddin; ., Maimuzar; ., Haris; ., Hendra
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13133

Abstract

This research aims to evaluate the factors that affect AC energy efficiency using statistical analysis methods. The data used is energy-efficient AC labeling data obtained from the Directorate General of New, Renewable, and Energy Conservation Energy (EBETKE) database. Violin plots are used to see the distribution of the data, a correlation heatmap is used to display the level of correlation between variables, and scatterplots and R-squared values are used to visualize linear relationships and measure the strength of the relationship. The results of the study show that efficiency has a very strong positive correlation with rating, with a correlation coefficient of 0.75, while it has a weak negative correlation with other variables. The R-squared value obtained for the linear relationship between efficiency and rating is 0.56, which indicates that 56% of the variation in efficiency can be explained by the variation in rating. This result shows that rating is a very influential factor on AC energy efficiency.
Analisis Sistem Distribusi BBM Dengan Menggunakan Konsep Cost-Based Value Stream Mapping di PT. Pertamina ., Derlini; Purwanto, Hadi; Polewangi, Yudi Daeng; Silvana, Nukhe Andri; Herlambang, Andri
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13596

Abstract

PT. Pertamina (Persero) Marketing Operation Region 1 (MOR1) oil fuel Terminal (TBBM) Medan Group has a problem that is less optimized the cost of the company's operational activities so as to reduce the company's profit then in this research combine the concept of cost-based and value stream mapping by describing the flow of information and material on the value stream and continued by calculating the cost based. After the calculation of the results can be obtained before the cost reduction, then the company to run its operational activities that consist of the process of acceptanming its duties and responsibilities as a distribution of fuel so that the operational activities of the company issued a distribution fee of Rp. 3.964,- / liter, then from the supply point switching there are 68 industrial companies that can be transferred to the fuel Terminal Pematangsiantar and 34 diverted to the fuel Terminal range so that the company can reduce the cost of distribution fuel by Rp. 2.429,-/liter.ce, filling and distribution of fuel to issue a distribution fee of Rp. 6.393,-/liter, by describing the value stream of identification of some waste namely waste waiting, waste over processing, waste motions and waste of transportation. After the improvement is the reduction of waste and supply point transfer to several industrial companies, the company can create effectively and efficiently in perfor.
Pengaruh Penambahan Nano-Aditif Ke Dalam Fluida Polyolester Terhadap Gesekan Dan Keausan Material AISI52100 Vs Cast Iron Ramadhan, Fajar; Fuadi, Zahrul; Kurniawan, Rudi; Rahmadiawan, Dieter; Nasution, Arya Rudi
Rekayasa Material, Manufaktur dan Energi Vol 6, No 1: Maret 2023
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v6i1.13600

Abstract

Synthetic lubricants have environment problems because they are difficult to decompose and be-come pollutant materials when disposed into the environment. Therefore, there is an increasing demand for biodegradable lubricants. One of the methods to achieve biodegradability of a lubricant is by using eco-friendly base material and nanoparticles from organic materials as additives, such as nanofibers, cellulose and graphene nanoplatelets. In previous studies, it has been confirmed that applying bacterial cellulose at various volume percentages into polyester (POE) oil has reduced friction and wear of the material up 49%. Other studies also mentioned that the addition of several layers of graphene as an additive to Polyalphaolefin (PAO) oil have decreased the value of the fric-tion coefficient from 0.15 to 0.08. In this study, due to their desirable properties, the bacterial cellu-lose (BC) and graphene nanopartcles were used as additives in polyester (POE) oil. Four types of lubricant specimens with different additive content were prepared for the study. The friction tests were carried out using a reciprocating pin on disk type tribometer at temperatures of 65°±3°C and 27°C. The results indicated improvements in the tribological properties; 60% friction reduction at temperature of 65°±3°C and 66.7% at a temperature of 27°C, with the presence of both BC and graphene in POE compared to those without the additives. In addition, the wear analysis from the results of micro-surface observation of the specimen indicates the reduction of the specific wear rate values as the effect of additives. It is found that the specific wear rate decreased from 6.09×10-6 mm3/N.m to 4.82×10-7 mm3/N.m at 65°±3°C and from 1.57×10-6 mm3/N.m to 2.38×10-7 mm3/N.m at 27°C with the presence of both BC and graphene in POE compared to those without the addi-tives.

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