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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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PLANNING AND SCHEDULING IN AUTOMATIC TRAIN SIGNALING MAINTENANCE: A REVIEW Raharjo, Rachmad Dwi; Wicaksono, Satrio; Budiwantoro, Bagus
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.v15i2.1552

Abstract

The development of automatic railway signaling systems that use moving block systems has grown rapidly. The moving block signaling system, which is a development of the fixed block system, has functions such as automatic control, shortening headways, increasing operating capacity, and railway safety. The Technology used in the moving block signaling system must be reliable and suitable for passenger comfort and safety. So, an effective and efficient maintenance method is needed. Planned and scheduled maintenance prevents disruption and gives minimum maintenance costs. The condition-based maintenance, on the other hand, is the right maintenance for an automatic train signaling system because it uses a data-driven model so that it can support decisions in determining maintenance strategies, and maintenance can be optimized using the Reliability, Availability, Maintainability, and Safety (RAMS) method with one of the Reliability Centered Maintenance (RCM) analysis tools. This optimization can increase operational safety, maintenance cost efficiency, and asset availability. In addition, another advantage of this RCM method is that it can identify critical components that require maintenance priority, so that maintenance resources can be optimized.
UJI KARAKTERISTIK BAHAN BAKAR ALTERNATIF HASIL PENGOLAHAN LIMBAH SAMPAH PLASTIK DENGAN METODE PIROLISASI BERTINGKAT Baride, La Baride; Achmad , Muhamad Iqbal; Tasman
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.v15i3.1561

Abstract

This study aims to determine the characteristics and quantity of oil produced from first and second level pyrolysis. The method in this research is an experiment with a pyrolysis tool designed in two levels. The advantage of this pyrolysis tool compared to other pyrolysis tools is that it is expected to produce two fuels with different physical and chemical properties. The results of the study showed that for the first level of pyrolysis PP plastic, 855.7 grams of oil was produced with the following characteristics: density @15°C = 754 kg/m³, final boiling point = 264.9°C, distillation @200°C = 71.8% v/v. while in the second level pyrolysis for the PP plastic type, it produces 138.5 grams of oil with the following characteristics: density @15°C = 718.5 kg/m³, distillation at 10% evaporation volume = 74.4°C, distillation at 50% evaporation volume = 123°C, and distillation at 90% evaporation volume = 142.1°C, final boiling point = 189.7°C. The first level pyrolysis process on HDPE plastic initially only produced 418 grams of oil with the following characteristics: density @15°C = 751.5 kg/m³, final boiling point = 279.4°C, distillation @200°C = 70.9%v/v. The fuel produced from the first level pyrolysis process has characteristics comparable to kerosene, while the fuel produced in the second level pyrolysis process has characteristics equivalent to 88 octane fuel.
PENGARUH JUMLAH ISIAN PROPELAN TERHADAP KECEPATAN PROYEKTIL MUNISI KALIBER 40X46 MM NON-LETHAL Sanjiwani, Yudistira; Pratikto, Pratikto; Irawan, Yudy Surya
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.v15i2.1564

Abstract

Many kinds of non-lethal ammunitions are developed in the last fourty years. The 40x46 mm Non-lethal ammunition is one of several ammunitions ready to be used in riot control. This type of ammunition can be used to subdue the target by implementing impact force. When developing non-lethal ammunition, it should be considered that the ammunition has adequate projectile velocity to ensure that the impact will produce sufficient pain to immobilize the target without risk of permanent injury. Projectile velocity is affected by the propellant weight and projectile weight. Therefore, a study to understand the effect of propellant charge weight on projectile velocity was done experimentally. This experiment was done by preparing several variations of propellant charge weight which were 0.150 gram, 0.200 gram, 0.250 gram, 0.300 gram and 0.350 gram. The desired output of this study is to obtain the correct amount of propellant charge weight to produce projectile velocity in accordance with the 40x46 mm Non-Lethal ammunition specification. The conclusion of this study is that Variation C ammunition with propellant charge weight of 0.250 gram is the closest variation to achieve nominal projectile velocity of 75 m/s. The exact range of propellant charge weight that can be used as production guidelines in order to comply with the product specification is between 0,228-0,280 grams APS350.
KARAKTERISASI SIFAT FISIK, KIMIA, DAN MEKANIK SERAT SELULOSA ALAMI DARI AMPAS TEBU Andrianto, Sis Nanda Kus; Fitri, Femiana Gapsari Madhi; Wijayanti , Widya
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.v15i2.1567

Abstract

The demand for cellulose fibers is increasing due to their eco-friendly nature. Natural fibers have special qualities that make them excellent for a wide range of fibrous applications, including composites, nanomaterials, biomaterials, textiles, and conductive carbon, which are the main causes of the increased demand. This study uses sodium hypochlorite (NaOCl) and sodium hydroxide (NaOH) to chemically treat sugarcane bagasse fibers. The highest tensile strength, 532.12 MPa, was found in the fibers treated with both NaOCl and NaOH. Hemicellulose, lignin, and other contaminants were removed through chemical processing, according to a Fourier transform infrared (FTIR) study. According to the SEM pictures, the NaOCl and NaOH-treated fibers' surfaces improved in cleanliness and roughness. The NaOCl and NaOH treatments showed promise for creating nanocellulose from bagasse fibers and for strengthening composites.
FEASIBILITY STUDY OF GROUND ENHANCEMENT MATERIAL (GEM) PRODUCTION STARTUP AS AN IMPORT SUBSTITUTION BASED ON TECHNOLOGICAL AND FINANCIAL ASPECTS Jakah, Jakah; Priswantoro, Andis; Farakhan, Putra Zaki; Syah, Herwin; Sumarnadi, Eko Tri; Herawan, Wawan
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.v15i2.1582

Abstract

Ground Enhancement Material (GEM) plays a crucial role in lightning protection systems by effectively channeling lightning voltage into the ground. Given Indonesia's reliance on imports, it is essential to explore domestic alternatives for GEM production. This study assesses the feasibility of establishing a local GEM production startup in Tasikmalaya, West Java, based on technological and financial aspects. The analysis assumes a production capacity of 300 kg per day, an interest rate of 10%, and an economic life of 10 years. The technical aspect includes considerations such as business location, raw materials, and process/equipment technology. The financial aspect employs the Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PP) calculation approaches. Ensuring an adequate supply of raw materials is crucial for long-term sustainability, maintaining product quality, and managing production costs. Financially, the project yields a positive NPV value (IDR 599,655,405), an IRR exceeding the interest rate (17.9% > 10%), and a relatively short investment payback period (5 years and two months). Based on consideration of the technical and financial aspects, it is evident that the GEM production startup is a feasible and profitable investment.
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.
PENGARUH PENAMBAHAN RADIUS PADA KECEPATAN DAN FREKUENSI SLUG DI DAERAH DOWNSTREAM T-JUNCTION MINICHANNEL Hananto, Leila Hanjani; Indarto; Untung Surya Dharma; Deendarlianto
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.v15i2.1586

Abstract

Multiphase flow channel is commonly applied in various industrial contexts, including lab-on-a-chip, nuclear power plants, microelectronics cooling systems, and chemical microreactors. Equipment ranging from mini to micro sizes plays a vital role in enhancing heat and mass transfer processes during the mixing of two or more phases. Non-uniform phase distribution during the passage of a two-phase flow through a T-junction can cause performance issues in the downstream region. A problem arising from the use of T-junctions is the occurrence of slugs. An experimental study was conducted to investigate the effect of varying bend radius on the flow characteristics in the downstream region of a T-junction minichannel, such as slug velocity and frequency. The slug velocity was researched in the downstream region of the horizontal minichannel T-junction. The working fluid used was air as the gas phase and water. The findings indicate that there is a linear relationship between the superficial velocities of air and water and the corresponding slug velocity in the downstream area of the horizontal minichannel T-junction, as observed through the utilization of a high-speed camera and MATLAB program for image processing. It has been observed that the local velocity within the channel increases as the corner radii increase towards the downstream region.
PIROLISIS MENGGUNAKAN SCREW SEBAGAI PRESSURE DROP DAN SIRIP PADA KONDENSOR Pane, Erlanda A; Rahardjo, Stevanus Budi; Ismail, Ismail
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.v15i2.1591

Abstract

The main factor that can determine the pyrolysis reaction is reactor type. However, the operational system of the pyrolysis reactor has a problem due to the low energy supply and low thermal conductivity of plastic. In addition, the particle agglomeration phenomenon occurs due to the presence of a thin layer due to the natural adhesive effect. This research made the development of the reactor design by the addition of a reactor section. The addition of a screw scrolls as a pressure drop system and fin parts on the condenser becomes the novelty. The aims of adding some sections are to reduce the particle agglomeration phenomenon and increase the quantity of syngas-pyrolysis oil from the system. The methodology is divided into design, manufacture, and pyrolysis experiments. This system can produce more pyrolysis oil compared to systems that use catalysts. The oil yield produced reached 88% at a target temperature of 450°C.
PERANCANGAN PROTOTYPE MEKANISME GERAKAN JARI JEMPOL UNTUK ROBOT TERAPI STROK Riyas, Nur Abdi Abdillah; Jatisukamto, Gaguk; Muttaqin , Aris Zainul; Mulyadi , Santoso; Sutjahjono , Hary
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.v15i3.1592

Abstract

Stroke is a functional disorder of the nervous system due to obstruction of blood flow to the brain. Rehabilitation is an effort to restore the function of the nervous system to a better condition than its current condition. Rehabilitation is carried out routinely by therapists with continuous physical therapy exercises. Patients can practice anywhere and anytime without depending on the therapist's schedule with technology-based rehabilitation, namely using an exoskeleton robot. This research examines the design of the human thumb finger mechanism according to anthropometric data so that it is expected to function under the working system of the human hand. Analyzing the movement of the thumb design with the help of Ansys Rigid Body Dynamics software. Analysis position with Ansys 19 R1 simulation for Rigid Body Dynamic mode. The results of the joint movement values (linkage) of the joints (interphalangeal joint, IP), MCP (metacarpophalangeal), and (carpometacarpal joint, CMC) are as follows. The (interphalangeal joint) IP angle simulation results get an angle value of -40.30°, while the CMC angle gets an angle value of 65.90° and the MCP angle gets an angle value of 71.80°. In comparison, the IP angle of the human thumb has an angle of 80-90°, the CMC angle is 43-70° and the MCP angle is 50-71°.
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.

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