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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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Kota malang,
Jawa timur
INDONESIA
Rekayasa Mesin
Published by Universitas Brawijaya
ISSN : 23381663     EISSN : 24776041     DOI : 10.21776/ub.jrm
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa Mesin aims to provide a forum for national and international academicians, researchers and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.
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Articles 15 Documents
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Search results for , issue "Vol 11, No 1 (2020)" : 15 Documents clear
STRENGTH AND DIMENSION ACCURACY IN FUSED DEPOSITION MODELING : A COMPARATIVE STUDY ON PARTS MAKING USING ABS AND PLA POLYMERS Tanoto, Yopi Yusuf; Anggono, Juliana; Budiman, Wesley; Philbert, Kresna Vincent
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.8

Abstract

Rapid prototyping is a group of techniques used to quickly scale physical parts or assemblies using three-dimensional computer-aided design (CAD) data. The process of 3D printing constructs three-dimensional objects from CAD models, usually by adding layers by a layer of material in a row. Therefore it is also called making addictive manufacturing. Along with the development of rapid prototyping, there are many choices of materials on the market to make parts of 3D printing. The material can be in the solid filament, liquid resin, or powder. Solid filament FDM technology material is the most commonly used by industry ? these materials such as ABS, PLA, PETG, HIPS, and others. In 3D printing products, several variables can be observed to produces specific responses desirable. Some of the responses are the efficiency of materials, dimensional accuracy of mechanical, and others. This research was conducted to compare ABS and PLA materials in the fused deposition modeling process. The strength and dimensional accuracy are the response that used in this study. The study reports that ABS has more significant tensile strength than PLA. The tensile strength of ABS is 7.66 MPa and 1.79 for PLA. PLA found has a more accurate dimension compare to ABS. Both on length and thickness, deviation of PLA lower than ABS. On a length, deviation of PLA was 0.06 mm and 0.86 for ABS. On thickness, deviation of PLA was 0.04 and 0.05 for ABS. 
Reaksi Cairan Jeruk Lemon (C6H8O7) dan NaoH terhadap Tegangan dan Arus yang Dihasilkan dengan Penambahan Katalis Karbon Aktif Amiruddin, Muhammad Agung; Irawan, Yudy Surya; Wardana, I Nyoman Gede
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.13

Abstract

Lemon is an environmentally friendly electrolyte. However, an innovative concept is needed to improve the quality of lemon electrolytes. The purpose of this study is to investigate the effect of activated carbon catalyst addition on the voltage and current electric generated from liquid lemon (C6H8O7) and NaOH. Lemon juice group containing acetone (C3H5O) and 3 carboxylic acid group (COOH). The experimental study was performed using voltaic cells. The data measured is 125 ml of an electrolyte solution of lemon juice (C6H8O7) and NaOH 10 grams. To the solution was added 5 grams, 7.5 grams and 10 grams of activated carbon catalyst. The results showed that the addition of activated carbon can accelerate the breaking molecular bond NaOH and C3H5O (COOH)3 which decomposes into ions react with NaCH2COO + and Cu 2+ cathode into a reductant then OH- from NaOH reacts with the anode Zn2++2e be the oxidant While H2O react exothermically. Produces a voltage between 800-1130 mV second. It occurs when electrons flow from the anode interested Zn2+ + 2e react with H2O and of  Zn2+ + 2e electrons pass led and resistor toward the cathode Cu2+. Cathode Cu 2+ reacts with C6H8O7 and NaOH. The currents that produced ranged from 33.846 to 43.462 mA second. The mechanism of this voltage and current generation makes LED light was on.
Skema JCM (Joint Crediting Mechanism) pada Investasi Fasilitas Pemurnian Biogas di Pabrik Kelapa Sawit Febijanto, Irhan
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.4

Abstract

Until now, the use of biogas in Palm Oil Mill (POM) is still limited to use as a fuel for Biogas Power Plant or utilize an additional boiler fuel. The use of biogas to be taken to other places is constrained by the remote location of POM and the transportation method. However, by converting biogas into bio-CNG, it can be used as vehicle fuel. The investment feasibility study of bio-CNG production facilities was carried out for two case studies, in POM with a capacity of 30 t/hr and 60 t/hr. The funding uses 100% of the equity fund and subsidy of the Joint Crediting Mechanism (JCM) scheme. Using the JCM scheme, the value of investment gets 50% funding assistance, and carbon credits from the reduction of Greenhouse Gas (GHG) emissions belong to the Japanese government. As a result of the study, it is known that the development of bio-CNG production facilities with 100% equity, IRR of both POM is below 11.08%, so it is not economically feasible. From the sensitivity analysis, it indicates that the increase in selling price of bio-CNG of +10%, a decrease in the investment of -10%, an increase in biogas input of +10% still cannot increase the Internal Rate of Return (IRR) value. Funding from JCM of 50% of the investment value increased the IRR value of 30t/hr and 60t/hr increasing from 6.54% to 18,29% and from 8.13% to 20.82%, respectively. The values of IRR became higher rather than the benchmark (IRR=11.08%). Carbon emissions reduction of the operation of the bio-CNG production facility and the use of bio-CNG for vehicle fuels in both of POMs are 38,735 tCO2/yr and 77,471 tCO2/yr, respectively. Using subsidy from carbon credits or other incentives will significantly help improve the economically feasible of bio-CNG production facilities in POM.
Pengaruh Kecepatan Udara pada Alat Pengering Jagung dengan Mekanisme Penukar Kalor Alit, Ida Bagus; Susana, I Gede Bawa
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.9

Abstract

The purpose of this study was to design and determine the performance of a dryer for drying corn with biomass burning energy sources. The dryer consists of a biomass stove, a heat exchanger, and a drying cabinet. The dimensions of the biomass stove are 500 x 500 x 800 mm with a diameter and hole distances of the biomass stove wall is 10 mm and 50 mm, respectively. The heat exchanger pipe diameter is 25.5 mm, the drying cabinet 500 x 500 x 600 mm, and the biomass was rice husk. The heat exchanger is made of stainless steel pipes arranged in a parallel arrangement. A heat exchanger pipe connects the biomass stove to the drying cabinet in order to avoid drying products from burning biomass contamination. The results showed that the drying rate could be faster if the air velocity increases. Drying corn in order to reduce water content from 19% to 12% takes 47 minutes with an air velocity of 3 m/s.
KARAKTERISTIK PEMBAKARAN DROPLET DENGAN VARIASI KOMPOSISI CAMPURAN BENSIN - ETANOL Arwin, Arwin; Yuliati, Lilis; Widodo, Agung Sugeng
Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.1

Abstract

The objective of this research is to investigate the droplet combustion characteristics of gasoline-ethanol fuel blended. The combustion characteristics included ignition delay time, burning lifetime, burning rate constant, flame height, flame temperature, and microexplosion. Testing was conducted using fuel blended with ethanol percentage of 0%(E0), 10%(E10), 20% (E20), 30% (E30) and 100% (E100). The fuel was dripped on the tip of the thermocouple junction and ignited using a torch of a butane-air mixture on a cylindrical burner. The results showed that the ignition delay time increase with the increase of ethanol percentage due to its high latent heat of evaporation and flash point temperature. However, flame temperature decrease with the increase of ethanol percentage due to the lower heat release rate of the mixture, related to the lower heating value of ethanol, and the burning rate constant of the fuels were not different significantly. The droplet diameter of the E100 (pure ethanol) decrease according to the d2?law, but the droplet diameters of the E0, E10, E20, and E30 changed drastically, exhibiting expansion and shrinkage. The Combustion of E20 fuel droplet has the highest burning rate constant, and flame height due to the oxygen content in ethanol can accelerate the combustion reaction and the fastest fuel droplet evaporates and diffuses into the air. Besides, the combustion of the E20 fuel droplet has the lowest burning lifetime due to the intensity of the microexplosion often makes the fuel droplet break into small droplets, which helps accelerate the process of evaporation and mixing of fuel with air, so that the combustion reaction occurs faster. Microexplosionphenomenon also identified due to the difference between the boiling point temperature gasoline and ethanol. 
Analisa Struktur Mikro dan Kekuatan Bending Sambungan Las TIG dengan Perbedaan Kuat Arus Listrik pada Logam Tak Sejenis Aluminium Paduan 5052-Baja Galvanis dengan Filler Al-Si 4043 Bintarto, Redi; Widodo, Teguh Dwi; Raharjo, Rudianto; Ma’arif, Moh. Syamsul; Dewi, Francisca Gayuh Utami; Pratama, Gesha Denny
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.14

Abstract

This study aims to determine the various effect of heat input due to varied electric current on microstructure of the weld joints and the bending strength of 2 dissimilar metals (aluminum alloy 5052 and galvanized steel) with Al-Si 4043 as filler. This experimental research was worked out by varying the strength of the current which can then be calculated into a heat input. The current inputs applied were 30.8 J / mm (70A), 35.2 J / mm (80A) and 39.6 J / mm (90A) while the protective gas flow rate used is 14 liters / minute. This study showed that the increase in heat input greatly affects the shape of the weld area microstructure, i.e. the microstructure and bending strength. Greater heat input due to higher current can melt larger area, so that the join process occured better. The highest bending strength at 9.05 Mpa was achieved for heat input at 39.6 J / mm or strong current of 90 A. The weakest bending strength at 8.88 Mpa was achieved for heat input at 35.2 J / mm or a strong current of 70 A.
Pengaruh Parameter Pemotongan CNC Milling dalam Pembuatan Pocket terhadap Getaran dan Kekasaran Permukaan pada Crankcase Mesin Pemotong Rumput Kaisan, Idris; Rusiyanto, Rusiyanto
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.5

Abstract

The purpose of the research is to find and prove the influence of machining parameters on vibration and roughness in the pocket milling process. The experimental method is used to improve the quality of products produced by CNC milling, the parameters used in the study are spindle rotation speed with variations of 300 rpm, 1200 rpm, and 3200 rpm, the depth of feed used is 2 mm and 0.5 mm. Then the test is carried out with a vibration test and surface roughness test. The data analysis technique used is descriptive statistics. The results obtained are the use of machining parameters affect the quality of the product in terms of roughness and vibration of the engine, with higher spindle rotational speed resulting in lower roughness values. The smaller the depth of feedings, the finer the roughness, then the higher the spindle rotation speed, then vibration will be lower, then the greater the depth of feed, the higher the vibration value.
Pengaruh Pelat Penyerap terhadap Kinerja Solar Still di Kota Ngabang Astrada, Astrada; Soeparman, Sudjito; Hamidi, Nurkholis
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.10

Abstract

The purpose of this study was to determine the effect of the use of black paint and gravel as an absorbent plate on solar still performance. This research was conducted to overcome the problem of limited clean water in the city of Ngabang, West Borneo. The research method used in this study is a direct experimental method for the object under study. Tests carried out on two solars still with a variety of absorbent plates, namely concrete coated with black paint and concrete coated with gravel. Surya is still made to have the same covering glass geometry. The duration of observation is 13 hours. Data collection is carried out every 10 minutes, starting at 06.00  until 19.00 local time. The results showed that concrete coated with gravel has higher performance compared to concrete coated with black paint as an absorbent plate on solar still. In the solar still, with gravel absorbent plates, the volume of distilled water is 3.64 L / 13 hours, and efficiency is 43.93%. Meanwhile, solar still coated with black paint as an absorbent plate producing a water volume of 2.42 L / 13 hours and an efficiency of 29.32%. The longer the observation time the sun's performance is still with gravel variations as an absorbent plate, the better it is compared to those who use black paint.
Tegangan Ambang pada Sambungan Las CDW antara Baja dan Kuningan dalam Lingkungan Korosif Lobo, Osmar Buntu; Darmadi, Djarot Bangun; Novareza, Oyong
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.15

Abstract

Failure at the welded joint can be occurs due to the Stress Corrosion Cracking (SCC) phenomenon. Dissimilar welding is more susceptible to SCC when compared to similar welding. This can be occurs because the material or metal that connected is non-homogeneous material. which causes the material will be difficult to be combined perfectly. This study aims to determine the threshold stress (σTh) at the dissimilar welded joint between steel and brass which have SCC loads. Both materials were connected by the welding method by using a Capacitive Discharge Welding (CDW) welding machine. Surface preparation or surface treatment is applied to one of the basic materials (low carbon steel) to obtain optimal joint results. The welded joint was tested by using Constant Load Test (CLT) methods, which is engineered in such a way that the welded joint get the stress,  corrosive environment (1M NHO3 solutions) and voids produced by the weld joint itself. The result shows that the threshold stress of the dissimilar welding joint between steel and brass by the CDW method is 330 MPa.
Pengaruh Variasi Konsentrasi Inhibitor dari Kitosan Sisik Ikan terhadap Perilaku Korosi Besi ASTM A36: Studi Ekstrapolarisasi Tafel dan EIS Hidayatullah, Syarif; Gapsari, Femiana; Setyarini, Putu Hadi
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.6

Abstract

Corrosion is the deterioration of metal that can reduce its yield strength, ultimate strength, financial losses, waste of natural resources, and endanger security. Thus, the corrosion rate must be slowed, or if possible, stopped. This study aimed to investigate the mechanism of corrosion protection by using corrosion inhibitors of chitosan extracted from fish scales on ASTM A36 steel. ASTM A36 steel was used as the specimen with a thickness of 3 mm. Fish scales powder was used as chitosan source extracted by using three mechanisms, i.e., deproteination (7% NaOH immersion), demineralization (immersion of 1 M HCl in 100 ml) and deacetylation (immersion process with 70% NaOH concentration). Corrosion inhibitor was composed of 8 g of chitosan from fish scales, 50 ml of distilled water, and 1 ml of CH3COOH. Corrosion protection with the inhibition method was applied with variations in the inhibitor concentration (1000 ppm, 2000 ppm, 3000 ppm, 4000 ppm, 5000 ppm, and 6000 ppm). The corrosion rate was tested by the polarization method and Electrochemical Impedance Spectroscopy (EIS). The result demonstrated that the effectiveness of corrosion protection started to increase from the concentration of 1000 ppm, 2000 ppm, 3000 ppm to 4000 ppm, with an effective value of 46.444%, 56.386%, 59.691%, and 72.630%, respectively. However, the effectiveness level started to decline from the concentrations of 5000 ppm to 6000 ppm, with 67.388% and 59.276%, respectively. This phenomenon occurs due to the inhibitor concentration has exceeded the maximum limit, so the interaction between inhibitor molecules was higher than the interaction between the inhibitor and the metal surface.

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