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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.
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Articles 43 Documents
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Search results for , issue "Vol. 16 No. 1 (2025)" : 43 Documents clear
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.
RANCANG BANGUN MESIN PERAJANG SINGKONG DENGAN SISTEM PENGATURAN KETEBALAN IRISAN DAN KECEPATAN Yassin, Muhamad; Sunyoto, Sunyoto
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.v16i1.1377

Abstract

The cassava chopper machine is one of the appropriate technologies used by small and medium enterprises. The results of the literature study and observation show that there are several issues, such as the ease of adjusting the thickness of the slices. The study aims to design a chopper machine equipped with slice thickness adjustment and speed control, with output measurements in the form of production capacity and slice quality. The method used in this research is the ADDIE (Analyze, Design, Development, Implementation and Evaluation) method. The specifications of the machine being made have dimensions 460x460x460 mm, with an electric motor driver (0.25 HP, 1400 rpm), a thickness variation of 0-2,5 mm, and two blades made of tungsten carbide. The results of this study show that the optimal thickness is 0.9 mm with speed adjustment in 1200 rpm. The capacity produced is 128.88 kg/hour with a slice quality of 90.49%.
ANALISIS RELIABILITY DAN UMUR PAKAI BEARING 6207 DENGAN MENGGUNAKAN METODE WEIBULL Dwilestari, Charisma; Feriyanto, Dafit
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.v16i1.1467

Abstract

Bearing is a mechanical component that is used as a place where the shaft rests on its axis and rotates with the holder and the shaft. The use of these bearings is focused on reducing friction; therefore, the friction that occurs is getting bigger along with the load, pedestal, working temperature, and conditions of loading and rotation that occur on the shaft. Estimation of damage and bearing life will be carried out on several bearings from different brands, but with the same type and size. Bearings with type 6207 and bore diameter of 35 mm come from 7 brands, namely SKF-SS (the only type in this study that used stainless steel), SKF, NSK, NACHI, KOYO SEIKO, SKF, and NTN. This analysis is carried out using the Weibull method where bearing specification data is processed by entering data into existing equations and analyzing the results of the calculations performed. The dynamic load value affects the L10 value of 9.3217%, predicted R(t) 13.5349%, ηcat 9.2567%, and Actual Reliability 3.9158%, this is due to the relationship between each of the equations used. Based on the reliability value generated, it can be concluded that the type of bearing recommended is NTN.
RANCANG BANGUN ALAT UJI UNJUK KERJA TURBIN ULIR DENGAN SISTEM AKUISISI DATA UNTUK MEDIA PEMBELAJARAN PRAKTIKUM TURBIN AIR Iswanda, Dovian; Suharto, Widodo Putra; Naufal, Alban; Andriani, Devi; Supandi, Supandi; Nurhaidah, Nurhaidah; Faino, Faino
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.v16i1.1506

Abstract

To facilitate students' understanding of the types of water turbines, how they work, and the parameters that affect the performance of water turbines, it will be easier if the water turbine is made on a laboratory scale so that students can observe directly and students can change some parameters directly so that students understand the parameters that affect the performance of water turbines. In this research, a laboratory-scale screw turbine type water turbine will be made equipped with a data acquisition system where several sensors will be installed to read the parameters when the turbine is operating which then all parameters will be displayed on the LCD and recorded into memory automatically. This research was conducted using experimental methods by designing and manufacturing screw turbines using 3D Printing using digital prototyping techniques and designing a data acquisition system to facilitate parameter measurement. The results of the study obtained a screw turbine model with an outer diameter (Ro) of 0.07 m, an inner diameter (Ri) of 0.03 m, a pitch distance of 0.05 m, a thread length of 0.6 m, a maximum output power of 3.5 W at a discharge of 0.07 m3/s, maximum efficiency of 6 % at a discharge of 0.07 m3/s.
EFFECT OF ACID CONCENTRATION AND ROTATION RATE ON PB LEACHING FROM GALENA ORES Sundari, Rita; Dahani, Wiwik; Marwanza , Irfan; Subandrio, Subandrio; Herdiyanto, Rizky B.
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.v16i1.1583

Abstract

This research is related to lead (Pb) leaching from galena ores using acid leaching method. The galena ores have been treated through pyrometallurgy method by roasting at 600oC 1h to yield galena concentrate. The Pb concentration has been determined by AAS (Atomic Absorption Spectrophotometry) using acid leaching method. This study has observed the effect of leaching acid concentration (acetic and sulfuric acids) and rotation rate on Pb leaching at 50oC 45 min. This study shows that varied acetic acid concentrations gave more effect on Pb extraction. Optimum condition achieved for 2.0 M acetic acid for all given rotation speeds (200 rpm, 300 rpm, and 400 rpm). For sulfuric acid leaching, optimum condition achieved at 1.0 M H2SO4 at 400 rpm. From the results, it is apparent that varied rotation speed (200 rpm, 300 rpm, 400 rpm) gave lesser effect on Pb leaching rather than varied acid concentration effect (0.5 M, 0.75 M, 1.0 M, 2.0 M, and 3.0 M).  In addition, the XRF (X-Ray Fluorescence) analysis on galena ores shows the existence of lanthanum, ytterbium, and europium (rare earth elements) in significant amount since rare earth elements displays important role in modern industry for nuclear battery, dental apparatus, microchips, hybrid vehicles, catalyst for cracking, audio device, and ceramic agent. Statistical and numerical analysis are briefly included in this study to determine the dominant factor and process optimization.
NUMERICAL ANALYSIS OF GILL AND COOLING DUCT ADDITION ON SIDEPOD OF FORMULA STUDENT RACING CAR TYPE Fauzun, Fauzun; Yudhistira, Thareq Akbar Arya; Yogiswara, Cahyo Wibi; Hidayat, Akbar Fadhlurrohman
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.v16i1.1624

Abstract

Formula Student SAE (FSAE) car is designed to optimize the engine performance to achieve maximum power. To get the maximum power, the work of the car is very vulnerable to over-heating problems. Prevention step of overheating problems can be done by optimizing radiator cooling system performance. It is needed a design that can maximize radiator cooling performance by maximizing the supply of airflow through the radiator using the aerodynamic system in the car. The sidepod geometry with the addition of gills and cooling duct is specifically investigated to produce best airflow to maximize radiator cooling performance and optimize the car's aerodynamic system. This research investigates how modifications to the sidepod geometry, including the addition of gills and cooling ducts, can improve airflow and heat transfer to maximize radiator cooling performance and enhance the car's aerodynamic system. The value of the heat transfer rate, lift coefficient, and drag coefficient of the car were investigated using ANSYS Fluent. Furthermore, the Existing Sidepod design was evaluated and the results will be taken as the forthcoming development of the new sidepod designs. Adding geometry to the sidepod proves can affect the value of the heat transfer rate, lift coefficient, and drag coefficient. The addition of geometry in the form of outlet gills and cooling duct has been proven to increase the value of heat transfer rate and reduce the value of lift coefficient and drag coefficient. While the addition of inlet gills only increases the value of the heat transfer rate and reduces lift coefficient without reducing drag coefficient. The best performance from all aspects reviewed was obtained by giving geometry on the sidepod is the outlet gills. This method offers a novel approach to optimizing sidepod designs in Formula Student Cars, contributing to both performance and efficiency advancements.
PERAN KOMPOSISI MINERAL PADA AIR GAMBUT DALAM MEMPERCEPAT REAKSI PEMBENTUKAN GAS HIDROGEN PADA PROSES ELEKTROLISIS Musthofa, Imron; Artika, Kurnia Dwi; Hairiyah, Nina; Nugraheni, Ika Kusuma
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.v16i1.1635

Abstract

The existence of peatlands in Indonesia is quite extensive, but many peatlands in Indonesia are not utilized properly. So, peatlands are left as is. The low pH value of peatlands makes it very difficult to use peatlands as agricultural land and can only be planted with grass and other wild plants. Apart from that, the air from peatlands is also very abundant and of course cannot be used for consumption because the pH level is low, ranging from 3.2–4.7. Due to its low pH value, peat water also contains various metallic minerals such as Na, Mg, Al, Fe, Ca, K, and others. The mineral compounds contained in peat water indirectly produce electrolyte properties and can be used as a catalyst to speed up the reaction to produce hydrogen gas using the electrolysis method. The use of peatlands in South Kalimantan as a source of renewable energy, especially in its use as a source of hydrogen gas, is an innovative concept in providing alternative energy potential to support sustainable development. In the electrolysis process, peat water can produce an electrical voltage of 12 V which flows through the cathode and anode. From the results of research that has been carried out, the highest hydrogen gas productivity value in the M4 variable is 29 mL. This is influenced by the number of minerals in the composition of peat water. The highest electric current flowing was 0.17 A, and the highest power produced was 2.1 watts for an electrolysis time of 20 minutes.
NUMERICAL ANALYSIS OF MOUNTING BRACKET STRUCTURE ON THE DAMPING EFFECT OF STABILIZER STEERING DAMPERS Wibowo, Muhammad Yusuf; Bahatmaka, Aldias; Rusiyanto, Rusiyanto; Fitriana, Deni Fajar; Ghyferi, Andi Abdullah; Anwar, Ahmad; Ridananda, Ayyub; Chasan, Ahmad
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.v16i1.1657

Abstract

Due to bumps or holes in the road, certain regions' road surface is still unsuitable for riding at high speeds. Many motorcycles used stabilizer steering dampers to reduce weave and wobble. Bracket is a structure that holds the stabilizer steering dampers to the motorcycle steering. Bracket plays a significant role in maintaining the stabilizer steering dampers as well as stopping any vibration due to the dynamic conditions. This paper presents Finite Element Analysis of a bracket, which is analyzed material aluminum 6061 and aluminum alloy cast. In this study, we have explored using Static Analysis to calculate the internal force, displacement, and stress of structural brackets. Hence in this study, we have performed Modal Analysis to determine the natural frequencies of the bracket for safety. And also, we have performed Transient Analysis to study the behavior of structure brackets over time in response to time-varying loads and vibrations in dynamic conditions.
KARAKTERISTIK MEKANIK ALUMINIUM PADUAN HASIL KOMPARASI PROSES EQUAL CHANNEL ANGULAR PRESSING VS ROLLING: Severe Plastic Deformation (S.P.D) Pramono, Agus; Alhamidi , Ahmad A.; Firmansyah, Asep A.; Suryana, Suryana; Alfirano, Alfirano; Ridwan, Asep
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.v16i1.1672

Abstract

Aluminum alloys are vital in industries such as automotive, aerospace, and manufacturing due to their strength, lightweight, and corrosion resistance. To enhance their mechanical performance and energy efficiency, advanced methods like severe plastic deformation (SPD) have been explored, with equal channel angular pressing (ECAP) proving effective in refining grain structures and improving material properties. ECAP was applied to the AA5XXX series aluminum alloy using a fixed-section die with a mold groove angle of 105°  and a curve angle of 75º, while keeping the cross-sectional dimensions of the specimen constant. Route C was employed, involving a variable number of passes. Subsequently, the results of the ECAP process were further enhanced through a 50% reduction roll process. A significant increase in strength and hardness was observed when comparing the combination of ECAP and 50% rolling with ECAP alone. The mechanical properties increased by 58.11% for the first pass, 58.66% for the second pass, 58.92% for the third pass, and 59.19% for the fourth pass. Grain refinement also exhibited substantial improvement in this combined process, with increases of 68.18% for the first pass, 77.59% for the second pass, 85.71% for the third pass, and 87.38% for the fourth pass. Pure ECAP yielded a maximum strength of 251 MPa and a hardness of 78.43 HB, while the combination of ECAP with 50% rolling achieved a maximum strength of 277 MPa and a hardness of 86.17 HB. This research successfully increased tensile strength and hardness while altering the microstructure grain size morphology.
HELICAL TUBE HEAT EXCHANGER DESIGN FOR MILK PASTEURIZATION PROCESS WITH HIGH TEMPERATURE SHORT TIME: English Kharisma , Aji Abdillah; Sari, Sri Poernomo; Suhada , Mochammad Fiqri
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.v16i1.1683

Abstract

The most common issue facing by the beverage industry is to maintain the cleanliness of a product. It is very important to note, especially for milk pasteurization process to kill bacteria, thus a heat exchanger is required. Heat exchanger is a device that allows heat transfer between two fluids of different temperatures. The purpose of this research is to design a helical tube heat exchanger, where this heat exchanger is focused on the heating process in milk pasteurization process. The designed tube is a helical model for the flow of milk fluid. The research method is carried out by designing a helical tube heat exchanger and performing simulations and mathematical calculations on the heat transfer. After simulation using software assistance and mathematical calculations, resulting shell length is 1.5 m, helical tube length is 6.4 m, shell diameter is 0.3 m and helical tube diameter is 0.023 m, totaling three pieces each. The shell utilized 304 stainless steel material and the helical tube used copper material which aims to improve the heat transfer process. The operating principle of this heat exchanger is as a heat exchange medium for milk fluid, the process will be carried out by this heat exchanger is the milk pasteurization process. The milk pasteurization method carried out in this final project is the higher temperature short time (HTST) method, which is the process of heating the milk fluid by producing milk outlet between 70oC – 75oC  for 15 seconds.

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