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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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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.
Arjuna Subject : -
Articles 965 Documents
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PENGARUH WAKTU SOLUTION TREATMENT DAN AGING TERHADAP KEKERASAN DAN KEKUATAN TARIK ALUMINIUM PADUAN AA 7075 – T6 Naafila, Amira; Purnowidodo, Anindito; Setyarini, Putu Hadi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.862

Abstract

Aluminium 7075 is a material used to plane body, because this material is corrosion-resistant, and its properties can be formed well, low density and light. Aluminium 7075-T6 which is mainly used for aircraft manufacturing, has a content of 0,37% Zn, 0,13% Mg, 0,07% Cu and 0,20% Si. Because this material 7075-T6 is heat treatable. It will be treated with the solution treatment (420ºC) and aging treatment (250ºC) each in 1hour and 2,5 hours to make precipitation. The hight strength and low hardness to find out the characteristics of aluminium 7075-T6 tensile strength testing, hardness testing and EDS (Energy Dispersive X-Ray Spectroscopy) testing will be carried out. And the result of tensile strength testing for raw material has an ultimate tensile strength (125,000MPa), elongation (0,02%) and the result of Rockwell hardness testing has (10,36 HRt). This material done by processed solution treatment with temperature (420ºC/hour, 2,5 hours/ 150ºC) has an ultimate tensile strength (95,833 MPa), elongation (0,26%) and for the Rockwell hardness testing the result is (49,2 HRt). The heat treatment made the solution treated aluminium grain bigger but increasing the strength because of precipitation.
STUDI NUMERIK KARAKTERISTIK PENGABUTAN BAHAN BAKAR DIESEL, BIODIESEL DAN CAMPURANNYA Hardiatama, Intan; Aziz, Muhammad Lutfi; Ilminafik, Nasrul; Sanata, Andi; Rosyadi, Ahmad Adib
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.907

Abstract

Biodiesel predicted to replace diesel fuel in the future that comes from the transesterification process of plant oils, animal fats, or used oils. One of the potential raw materials is nyamplung seeds because they are scattered in Indonesia, easy to cultivate, and bear fruit throughout the year [1]. The purpose of this study was to determine the effect of mixing pure diesel fuel and nyamplung biodiesel with the fuel composition B0, B20, B30, and B100 on the spray tip characteristics penetration, spray angle, and sauter mean diameter.This study focussed on simulation. The simulation method is carried out to predict the distribution and mean diameter of droplet using commercial fluent software. Fuel spray is carried out in free air with an injection pressure of 15 MPa, fuel temperature 28.2 ℃ and free air temperature 30.1 ℃. The spray process was taken at 6.25 ms and then the fuel spray characteristics were measured using the ImageJ application.The results of testing the fuel spray characteristics indicate that the amount of biodiesel content in the fuel is 20-100%. It can increase the length of spray tip penetration about 0.7-4.9%, a decrease in spray angle of 9.2-32.1% and the sauter mean diameter value increased by 20.1-84.6%. It caused by increasing the amount of biodiesel content in the fuel which results in an increase in the value of density, viscosity and surface tension of the fuel.
ANALISIS KERUSAKAN AKIBAT MISFIRING PADA MOTOR TORAK DENGAN MENGGUNAKAN METODA GETARAN Subekti, Subekti; Hidayat, Muhammad Nurul; Effendi, Basuki Dwi
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.980

Abstract

The working principle of the piston engine consists of a system that follows a thermodynamic cycle and a mechanical cycle. The thermodynamic cycle is known as a (P-T) diagram while the mechanical cycle is known as a (P-V) diagram. In operation, the piston engine can move in a rotating manner with a certain rotation because it gets a force that comes from the combustion process. The primary vibration force is caused by the combustion gas pressure in the combustion chamber, such as detonation caused by uneven spraying in the combustion chamber and misfire is characterized by a low maximum pressure using vibration analysis. The higher the amplitude produced by the spark plug, the higher the effect of engine vibration produced. The engine speed, power and load applied to the engine greatly affect the misfiring of the spark plug. Misfiring has a frequency amplitude that tends to be more, this causes the driver discomfort while driving. The frequency that has the highest amplitude is around 100 Hz on misfiring spark plugs, and 120 Hz – 130 Hz on normal spark plugs. At idle engine speed of 900 rpm, 1500 rpm, 2000 rpm, normal spark plugs have the highest amplitude on the X and Y axis channels, while for misfiring spark plugs the highest amplitude is only on the Z axis.
STUDY OF ADDITIONAL FIN TO INCREASE EFFICIENCY OF SUPERHEATER AT HEAT RECOVERY STEAM GENERATOR Bramantya, Muhammad Agung
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1002

Abstract

Power plants are part of industrial facilities used to produce and generate electricity from various power sources; one of those is PLTGU (Pembangkit Listrik Tenaga Gas dan Uap or Gas and Steam Power Plant). PLTGU is a combined cycle between PLTG and PLTU. It is necessary to achieve a high-capacity target for the PLTGU to increase the generator's efficiency. One way to increase the efficiency of gas and steam power plants is by optimizing heat transfer in the Heat Recovery Steam Generator (HRSG). HRSG has several modules such as superheater, evaporator, economizer, and preheater. One that plays an essential role in absorbed high-temperature steam from the gas turbine is the superheater. The function of the superheater is to utilize the heat from the flue gas to reheat the fluid needed for the steam turbine. In this research, improvements of superheater were made with several fin variations at HRSG PLTGU. Variable of superheater refer to data on the layout of the HRSG PLTGU. Autodesk Inventor is used to modeling flue gas domain, tube, and fin. Additional of the fin has the purpose of optimizing heat transfer distribution in steam through a tube, such as an outlet temperature and efficiency of steam in tube superheater. The use of CFD (Computational Fluid Dynamic) with ANSYS Fluent could use to determine the temperature distribution of the superheater. The most optimal efficiency and outlet temperature of variation fin is the annular fin variation compared to the rectangular and straight fin variations.
PEMANFAATAN ZEOLIT NAA DARI KAOLIN SEBAGAI ADSORBEN LOGAM BESI (FE) PADA LIMBAH CAIR LABORATORIUM Zuryati, Ulul Khairi; Honiar, Ruru; Fahrurazi, Fahrurazi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1049

Abstract

Excessive iron (Fe) content in water caused corrosion and at high amounts are toxic to the human body. One of the laboratory waste water treatment techniques is adsorption method. The adsorbent used in this study was zeolite NaA which was synthesized using kaolin as one of the most abundant minerals in Indonesia. The zeolite obtained was analyzed by FTIR to determine the functional groups. The synthesis of NaA zeolite have been successful indicated by the absorption band appeared in the wavenumber range of 558–546 cm−1 which showed the formation of double ring structure as a characteristic of the NaA zeolite crystal. Optimum pH for adsorption of Fe (II), Fe (III) ions and mixtures in laboratory waste using zeolite NaA is 3. The maximum adsorption capacity of NaA zeolite on Fe (II), Fe (III) ions and laboratory wastewater are 16.00, 18.33, and 6.50 m/g adsorbent. Whereas adsorption equilibrium times for Fe (II), Fe (II), and laboratory deposit waste water were 30, 20, and 10 minutes, respectively.
PERSAMAAN REGRESI LINIER BERGANDA UNTUK MEMPREDIKSI EFISIENSI BOILER Eko Sarwono; Martin Choirul Fatah; Brunner, I Made Indradjaja Marcus Brunner
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1179

Abstract

Boiler efficiency calculation is crucial to determine the reliability of boiler performance. Generally, boiler efficiency is calculated by the heat loss method, which considers losses in the combustion process. The calculation consumes more time due to detailed procedure and analysis. This research aims to develop a multiple linear regression equation in predicting boiler efficiency based on performance test data from PLTU X unit 1. The equation was then validated with a classical assumption test, i.e. normality, linearity, multicollinearity, heteroscedasticity, autocorrelation, and hypothesis test. In addition, the equation was used to calculate the boiler efficiency at PLTU ABC (unit 1 & 2) and PLTU XYZ (unit 1). The results show that there is approximately 0.49% boiler efficiency discrepancy among equation and heat loss method calculations.
ANALISIS KARAKTERISTIK SUDUT PENYEMPROTAN BIODIESEL PALM OIL MELALUI PENAMBAHAN VARIASI KONSENTRASI METANOL Suryaningrat, Muhammad; Sasongko, Mega Nur; Hamidi, Nurkholis; Saputro, Nurhadi
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1211

Abstract

This study aims to determine the effect of adding methanol as an additive to biodiesel to the spray angle on the diesel fuel injector. The material used in this study was palm oil biodiesel and added methanol with a concentration variation of 5%; 10%; 15%; 20% and 25% of the volume of the mixture (500 mL). The first step is mixing methanol and biodiesel according to the variables (B100; B100M5; B100M10; B100M15; B100M20 and B100M25). Next, the mixture is injected into the simulation of the combustion chamber through the injector nozzle, then the fuel that enters the simulation of the combustion chamber is recorded with a high-speed camera so that an image of the spray angle is obtained. Based on the method that has been carried out, it is found that the addition of variations in the concentration of methanol has an effect on the fuel spray angle. The higher the concentration of methanol added to biodiesel, the greater the spray angle of the fuel mixture. Spray angle for B100; B100M5; B100M10; B100M15; B100M20 and B100M25 are 7.5018o; 10.4018o; 11.8462o; 13.6052o; 14.0148o; and 14.6206o, approximately. This is because with the addition of methanol with higher levels, the mass of oxygen gas will be even greater. The greater the mass of oxygen in the fuel, the easier it is for the fuel to burn.
PENGARUH PENGUJIAN KEKERASAN DAN PENGUJIAN TEKAN TERHADAP KARAKTERISTIK GAYA TUMBUKAN PADA CANGKANG KENARI (CANARIUM INDICUM L) Loppies, Leslie S.; Patty, Alexander A.; Pelasula, Berthy; Lekatompessy, Roy R.; Nanulaitta, Nevada Mario
Jurnal Rekayasa Mesin Vol. 15 No. 1 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i1.1227

Abstract

Kenari (Canarium indicum L) belongs to the Burseraceae family and is one of the endemic fruits in Indonesia, especially Maluku. Walnuts have a tough shell that encloses the flesh, to get the flesh without damaging it careful effort is needed. This study investigated the strength of walnut shells through mechanical testing to determine the amount of impact force needed to break the walnut shell. The mechanical test carried out is a compression test and impact test. The values of these tests assist in determining, measuring, and analyzing the minimum and maximum force loads required to crack a walnut shell. Tests were carried out on walnut shells from 6 different villages on Ambon Island and Saparua Island. The impact test where the highest impact absorption energy value was found in walnut shells from Booi Village, namely 23.18 J/mm2, and the lowest in walnut shells from Morela Village, 22.40 J/mm2. In the compression test where the lowest value was found in walnut shells from Morela village with a value of 3.61 MPa while the highest value was found in walnut shells from Booi village, namely 5.24 MPa. Whereas the minimum compressive force is 16.22 kgf/mm2 and the maximum compressive force is 17.61 kgf/mm2.
OPTIMASI MULTIOBJEKTIF PARAMETER PROSES 3D PRINTER JENIS FUSED DEPOSITION MODELLING MENGGUNAKAN GREY RELATIONAL ANALYSIS-TAGUCHI Shanaswara , Adhira Azhari; Aditya, Muhammad Randi Nur; Rashyid, Muhammad Ibnu; Herianto, Herianto; Muflikhun, Muhammad Akhsin
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1253

Abstract

The development of fused deposition modelling (FDM) 3D printer models is increasing where the applications can be found in several aspects such as rapid prototyping, functionally components, and parts for assembly process. These conditions required excellent printing quality. One of the factors that affect the printing quality was process parameter setting. There are several parameters process that are used in 3D printing. Hence, the use of these parameters that recommended by manufacturer often give the average results, not the best results. The recent study purposes are to gain optimal setting that give accuracy in the dimension and suitable surface condition. There are 12 factors with 3 different levels. The study used Taguchi method L-27 and grey relational analysis (GRA) to determine the most efficient combinations that can fulfill multi-objective. The results showed that to acquire the accuracy and total dimension, the following combination are used; LH0,075mm, LW0,45mm, IPLines, WT0,8mm, PT205C, FR85%, RD6,5mm, RS30mm/s, PS30mm/s, OWS15mm/s2, PA10mm/s2, and PJ10mm/s where wall thickness (WT); flow rate (FR); and retraction distance (RD) used as 3 essential factors that can influence the respond of the machine. The best surface roughness gathered with the combination as follow; LH0,075mm, LW0,35mm, IPGrid, WT0,8mm, PT200C, FR95%, RD2mm, RS30mm/s, PS70mm/s, OWS25mm/s, PA3000mm/s2, dan PJ30mm/s where the layer height (LH) was the essential factor that affect the machine respond. The accuracy of the dimension and the most optimum surface roughness can be acquired by the following combinations: LH0,075mm, LW0,35mm, IPGrid, WT0,8mm, PT205C, FR95%, RD4,5mm, RS30mm/s, PS70 m/s, OWS15 mm/s, PA3000 mm/s2, dan PJ10mm/s.  
PENGARUH SUHU LELEH MATRIK DAN PERLAKUAN CRYOGENIC SERAT KARBON TERHADAP INTERFACIAL SHEAR STRENGTH CARBON FIBER REINFORCED POLYPROPYLENE Budiyantoro, Cahyo; Attoriq, Fajri; Sosiati, Harini
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1259

Abstract

Sifat mekanik komposit termoplastik berpenguat serat karbon dipengaruhi kinerja ikatan antarmuka antara serat dengan matrik. Dalam penelitian ini parameter proses  berupa suhu pencairan matrik dan perlakuan kriogenik serat karbon telah dioptimasikan dalam pembuatan filamen komposit untuk meningkatkan interfacial shear strength (IFSS). Filamen komposit polipropilena yang diperkuat serat karbon dibuat dengan menggunakan mesin ekstrusi-pultrusion. Temperatur peleburan divariasikan pada 180 oC, 190 oC, dan 200 oC. Serat karbon terlebih dahulu direndam dalam nitrogen cair dengan variasi waktu 10, 15, dan 20 menit untuk meningkatkan kekasaran permukaan serat. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh temperatur leleh dan perlakuan kriogenik serat karbon terhadap IFSS filamen komposit. Nilai IFSS diukur menggunakan uji pull-out, sedangkan morfologi permukaannya diamati menggunakan Scanning Electron Microscope. Hasil penelitian menunjukkan bahwa perlakuan serat dengan nitrogen cair memberikan pengaruh lebih dominan dalam peningkatan IFSS. Perlakuan serat secara kriogenik selama 20 menit direkomendasikan karena memberikan kekasaran permukaan tertinggi. Kombinasi parameter proses yang memberikan IFSS tertinggi adalah dengan perendaman serat karbon selama 20 menit dan aplikasi suhu pencairan matrik sebesar 190 oC.

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