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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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DEVELOPMENT OF MASSAGE CHAIR MADE OF CARDBOARD MATERIALS: DESIGN, FABRICATION, AND STRENGTH EVALUATION Zulaikah, Siti; Triawan , Farid; Budiman , Bentang Arief; Romadhon , Yusuf
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.v15i2.1593

Abstract

This study aims to design and fabricate a prototype of massage chair made of corrugated cardboard materials and evaluate its structural strength. It could be a pioneering study as no one had manifested or discussed it before. The prototype is currently made with dimensions of approximately 60 ´ 50 ´ 100 cm, consisting of 6 cardboard components, affords a reflexology sensation from solid rubber balls, and provides reclinable features at the backrest and footrest. The most prominent benefit of this cardboard massage chair compared to the commercialized ones is environmentally friendly and lightweight products. Moreover, the constructed component can be disassembled and folded, making it a portable massage chair. From the strength evaluation, the cardboard massage chair can still endure a load of 50 kg to the prototype’s seat, backrest, and footrest. However, multi loading directions (e.g., vertical, longitudinal, lateral), stress concentration, and fluctuating person weight would generate tremendous stress and lead to a more substantial possibility of damage and failures on the cardboard after several testing cycles. Therefore, further improvement processes should be investigated to develop an optimized version of cardboard massage chair in the future.
REVIEW: VARIOUS TREATMENTS NAOH, SEA WATER, FUMIGATION, LIQUID SMOKE TO IMPROVE TENSILE STRENGTH AND SURFACE MORPHOLOGY OF NATURAL FIBER Muslimin, Mukhlis; Wirawan, Willy Artha; Palungan, Musa Bondaris
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.v15i2.1600

Abstract

This article is a literature review of several studies oriented toward the treatment of natural fiber to improve the surface morphology and tensile strength of the fiber. The method used is to review several studies that describe the physical and mechanical properties of natural fiber with different treatments such as immersion of sago fiber in liquid smoke, coconut fiber in NaOH, palm fiber in seawater, and smoking of king pineapple fiber, and banana stem fiber with liquid smoke. The results of the review showed that the treatment was able to increase the tensile strength of sago fiber by 26.77%, coconut fiber by 81.25%, palm fiber by 67.40%, waru bark fiber by 59,97%, coconut fiber with limestone water 34,96 %, king pineapple fiber by 74.45%, and banana stem fiber by 43.78%. The effect of some of these treatments can also change the morphology of the fiber. So, it was concluded that treatment was needed to change the physical properties of the fiber in the form of morphology and mechanical properties in the form of better fiber tensile strength so that the fiber used as a composite reinforcement could improve the mechanical properties of the composite.
IMPLEMENTASI DAN PENGUJIAN PROTOTIPE TURBIN JENIS PROPELLER UNTUK PEMBANGKIT LISTRIK TENAGA MIKROHIDRO Sudiro, Rafiandi Dyaa; Halim, Levin; Arthaya, Bagus Made
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.v15i2.1610

Abstract

The implementation of a small-scale Micro-Hydro Power Plant which considering a 2-meter water head river will be discussed in this research. Therefore, a Micro-Hydro Power Plant with a Propeller turbine type was implemented. The turbine components include the turbine wheel, blades, guide vanes, turbine housing, turbine cover, and discharge pipe. Each component was manufactured using a 3D printing process with PLA filament. The testing process involved a miniature dam made from a container with a height of 1 meter, connected vertically with pipes. Water flowing into the turbine rotates the turbine wheel, causing it to rotate on the turbine shaft. Output data, including rthe number of rotations (RPM) and torque (M), were collected using sensors placed on the turbine wheel shaft. The testing results of the prototype Propeller turbine showed an efficiency of over 90% at a flow rate of approximately 0.008 m^3/s. Under the ideal design conditions with 90% efficiency, the prototype turbine would operate at a rotation speed of 2880 RPM and generate a power output (P) of 66 Watts.
KAJIAN EKSPERIMENTAL PENGARUH PARAMETER OPERASI TERHADAP PEMECAHAN GELEMBUNG DAN KINERJA PEMBANGKIT GELEMBUNG MIKRO TIPE SWIRL Mawarni, Drajat Indah; Budhijanto , Wiratni Budhijanto; Deendarlianto , Deendarlianto; Ristiyanto , Hartono Guntur Ristiyanto; Marahendra , Wawan Dedi Marahendra; Indarto , Indarto
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.v15i2.1611

Abstract

In this study, we present the bubble breaking mechanism of the rotating flow in the swirl type microbubble generator (MBG) on the resulting performance in this case the oxygen dissolution rate. This type of MBG is an aeration technology and has been developed in recent years by utilizing the turbulence of liquid fluid flow to produce micron-sized bubbles. The pressure difference created by changing the cross-sectional diameter causes air to be sucked in automatically in the mixing channel and forms a bubble channel before finally bursting to form micron-sized bubbles at the MBG outlet. The experiment was carried out in a transparent container measuring 2.8 m x 0.6 m x 0.6 m which was filled with water as high as 0.4 m. This study is focused on studying the mechanism of bubble breakdown at the MBG outlet on the dissolution rate of oxygen (dissolved oxygen/DO) which is influenced by the volumetric flow rate of liquid (Q_L) and volumetric flow rate of air (Q_G). Various combinations of Q_L and Q_G values were systematically compared with the resulting oxygen mass transfer coefficient (KLa) values. Dissolved oxygen (DO) values were measured at a distance of 60 cm from the MBG outlet. The final results of the study revealed that the higher the Q_Lvalue, the more frequent the intensity of bubble bursting, the greater the number of bubbles produced with the smaller diameter and the higher the DO value, and vice versa. Whereas the higher the Q_Gvalue, the intensity of the bubble breakdown that occurs is relatively the same, the number of bubbles produced is less and the diameter is larger and the DO value is lower, and vice versa.
EVALUASI KONVERSI DAN DISTRIBUSI ENERGI PADA RESEARCH TEST ENGINE TIPE 240PE BERBAHAN BAKAR GASOLINE JENIS PERTALITE Paloboran, Marthen; Pangruruk , Thesya Atarezcha Pangruruk; Darmawang, Darmawang; Tjandi , Yunus Tjandi; Yasdin , Yasdin; Wabdillah , Wabdillah; Sidin, Udin Sidik; Asmeati , Asmeati
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.v15i2.1626

Abstract

Gasoline fuel is a kind of fossil fuel that is still the primary fuel for vehicles and motorcycles nowadays. Demand for fuel continues to increase from time to time, so an effort is needed to save the use of fuel. This research is intended as an initial study to determine the quantity of heat energy converted and distributed into several engine performance parameters. Furthermore, the results of this study became the basis for the development of similar research to produce high engine performance and low emissions as well as economists by setting combustion parameters. The result shows that only a small portion of the heat generated from pertalite fuel is used as effective power. Most of the heat energy from the fuel is wasted in the environment and distributed into radiant heat, and some of it becomes heat to the exhaust gases and heat to the cooling water.
PENGARUH PENGGUNAAN MINYAK JAGUNG UNTUK CUTTING FLUID PADA PROSES FACE MILLING TERHADAP KEKASARAN PERMUKAAN PERMUKAAN DAN LAJU KOROSI BAJA KARBON Widodo, Teguh Dwi; Suwarso, Wahyu Handoyo; Wahyudiono, Arif; Raharjo, Rudianto; Bintarto, Redi; Sasongko, Mega Nur; Darmadi, Djarot Bangun; Setiawan, Yustiza Rahadian
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.v14i3.1627

Abstract

The corrosive coastal environment will result in a high corrosion rate for any equipment installed there. This is due to the constant exposure to saltwater, high humidity levels, and strong winds. Therefore, it is crucial to use corrosion-resistant materials and regularly maintain the equipment to ensure its longevity in such an environment. One method to reduce the rate of corrosion is to pay close attention to the manufacturing parameters of these components, one of which is the face milling process. The aim of this study is investigating the effect of face milling process with different dept of cut using minimum quantity lubrication method with corn oil as a renewable vegetable cutting fluid. In this study AISI 316L stainless steel was face milled using HAAS VF-2 CNC machine. The depth of cut is varied between 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm. The results demonstrated that the greater the depth of cut, the greater the surface roughness value that will be generated. It is resulting in increment in the corrosion rate value.
DELAYED CRACKING FAILURE OF A FREEZER BARREL Albatros, Thomas; Ardy, Husaini
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.v14i3.1629

Abstract

Freezers were used to produce ice cream, pumped by a screw pump into a barrel. The barrel’s outer surface was operated with NH3 gas at -40 oC and a 12–13 bar pressure. After being in service for 3 years, the unit experienced cracking. The barrel material was Nickel 200, with a base metal average grain size of 48μm. The weld metal has a larger average grain size of 800μm and contains many gas pockets inside and along the grain boundaries, which coalesce one after another, forming micro-cracks that result in intergranular cracking. The weld metal failed in a brittle manner; this embrittlement was attributed to hydrogen atoms ingressing into the weld metal during welding. Atomic hydrogen will diffuse, forming hydrogen gas. Since atomic diffusion takes place over a long period, the occurrence of cracks is well-known as delayed cracking.
SIMULASI NUMERIK ALIRAN FLUIDA PADA KINCIR AIR MENGGUNAKAN METODE SLIDING MESH INTERFACE Agato, Agato; Deendarlianto, Deendarlianto; Indarto, Indarto; Alfeus Sunarso
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.v15i2.1634

Abstract

This research is aimed to investigate the accuracy and cost-effectiveness of numerical simulation method for the study of flow in a waterwheel system by comparing the results to the results of experiment, as well as by comparing the computational load of various solution schemes. The simulation is performed using Ansys Fluent with sliding mesh interface (SMI) method to treat the interface between rotating waterwheel region and static channel region. The governing equations are solved using the SIMPLE and Coupled schemes, and the effects of spatial and temporal resolutions are investigated. In general, the values of torque and power and the flow patterns obtained using numerical simulation are in a good agreement with those obtained using the experiment, which confirms the reliability of the simulation method. Considering the accuracy and computational load, it is recommended to use the Coupled scheme instead of the SIMPLE scheme for numerical simulation using SMI method.
PENGARUH VARIASI TEMPERATUR FURNANCE BRAZING TERHADAP SIFAT MEKANIK DALAM PEMBUATAN GRINDING ROLL MATERIAL FCD 500 DAN NI-HARD1 Siswanto, Ari; Hanaldi , Kus; Purwadi , Wiwik; Nadi, M. Rizki Gorbyandi
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.v15i2.1639

Abstract

This research was conducted on nodular cast iron FCD 500 and white cast iron Ni-Hard1 in the manufacturing of grinding rolls. These rolls were joined together using the furnace brazing method, with CuZn 35 filler metal placed between the two parent metals. The pressure applied in this experiment was 26,000 N using a pressure aid. The assembled parts of the grinding rolls were heated in a muffle furnace with temperature variations of 900, 950, and 1000 °C, with a holding time of 120 minutes. The results of the furnace brazing process revealed that the grinding roll sample achieved the highest shear strength at a temperature of 900 °C, with a shear strength of 6.52 MPa. The observed low shear strength is due to the penetration bonding between the metals. This was confirmed by the line analysis test, which indicated no diffusion process occurring between the metals. As the holding temperature of the brazing furnace increased, the shear strength decreased, primarily due to the melting of the CuZn 35 metal at temperatures above 900 °C, resulting in micro porosity. During the furnace brazing process, changes were observed in the microstructure of the FCD 500 parent metal. There was an increase in the amount of pearlite fraction, which in turn increased the hardness value. Additionally, the microstructure of Ni-Hard1 changed from austenite to martensite, leading to an increase in the hardness value.
REVIEW OF SPEED PROFILE OPTIMIZATION METHODS FOR ENERGY EFFICIENCY IN TRAIN Abdillah, Kusuma; Gunawan , Leonardo Gunawan; Handoko , Yunendar Aryo Handoko
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.v15i2.1640

Abstract

Improving energy efficiency in the transportation system is an important goal in facing the challenges of climate change and limited energy resources. Electric trains are a promising alternative for reducing greenhouse gas emissions and dependence on fossil fuels. Speed profile optimization has been a significant research focus on achieving maximum energy efficiency in electric trains. This paper aims to provide insight into energy efficiency using speed profile optimization.  Several issues were discussed in this paper including energy consumption modeling methods, speed profile optimization methods, and integration of speed profile optimization with schedules and regenerative braking. This study concluded that the most frequently used energy consumption modeling is the deterministic model using the Davis equation. There are two classifications in optimization: classical and modern methods (heuristics). Classical optimization methods are often used on problems with simple constraints, and modern methods are often used on problems with more complex constraints or variables.

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