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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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RANCANG BANGUN MODEL PEMBANGKIT LISTRIK TENAGA MIKRO HIDRO (PLTMH) MENGGUNAKAN PADDLE BREAST WHEEL Nur, Ichlas; Rais, Wahmin; Effiandi, Nota; Zamri, Aidil; Yetri, Yuli
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.v15i3.1602

Abstract

The need for electrical energy is increasing along with technological advances. In addition to the large population in an area, the variable economic activity of the population, which continues to increase to meet their daily needs, also has an impact on increasing the need for electrical energy. Demand for electrical energy is in line with increased economic activity. Therefore, developing renewable energy to provide sufficient electricity supply is very important. In this research, the modeling of a Micro Hydro Power Plant (PLTMH) has been designed using a breast wheel with a semicircular blade shape, a wheel diameter of 20cm, and 10 blades. The wheel model has 5 variations of water level (head) calculated from the water level in the reservoir to the water level in the wheel with 3 variations of ball valve openings. It was observed that the highest efficiency is at a head height of 0.8 m with a pipe cross-sectional area (A) of 0.0002 m2 with an efficiency of 70.11 percent. The increase in the flow rate of water flowing towards the breast wheel turns out to cause the wheel rotation to decrease. The decrease in the wheel's rotation is related to the increase in turbulence (collision) due to the large discharge of water against the wheels' walls. It can be concluded that the combination of gravity and water propulsion can move the breast wheel so that it produces electrical energy.
STUDI NUMERIK EFEK LETAK AIR SUPPLY DIFFUSERS DAN AIR RETURN GRILLES PADA DISTRIBUSI TEMPERATUR DAN KECEPATAN UDARA DI BUS Fauzun, Fauzun; Hidayat, Akbar Fadhlurrohman; Yogiswara, Cahyo Wibi
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.v15i3.1606

Abstract

The purpose of air conditioning system in the vehicle is to provide comfort for passengers. To achieve this, it is required to investigate the air flow and temperature distribution in the passenger area. This study aims to find the effect of layout variations of the air supply diffuser and air return grille on the temperature and velocity distribution in the passenger compartment of a bus and get the most optimal system with CFD simulation method that used ANSYS Fluent. The number of layout variations that simulated is six. The results can be inferred that the variation with one air supply diffuser at the floor or sidewall and the air return grille located on the bottom sidewall will result in lower temperature distribution. Then, it will make lower average air velocity at the top of the compartment. Considering nonuniformity index and heat removal efficiency, the most optimal scheme system is owned with one air supply diffuser on the sidewall, another on the ceiling, and the air return grille on the bottom sidewall.
DESAIN AWAL RUANG BAKAR PREMIXED UNTUK TURBIN GAS ULTRA MIKRO (TGUM) DENGAN MENGGUNAKAN PENDEKATAN TEMPERATUR ADIABATIK Al Gifari, Muhamad Maris; Hartono, Firman; Darmanto, Prihadi Setyo; Reksowardojo, Iman Kartolaksono
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.v15i3.1613

Abstract

The need to develop ultra-micro gas turbine (TGUM) applications is getting higher, especially as a portable energy source. Many applications whose energy requirements cannot be met by current batteries but can be handled by TGUM. The energy density of kerosene is 45 times greater than that of current batteries. The development of ultra-micro gas turbines has been carried out for more than 20 years. The challenge faced in the TGUM development process was manufacturing technology, but manufacturing developments continue to advance over time, meaning that one day high-speed bearing technology may be achieved. The development of an ultra-micro gas turbine can be started from the design of the combustion chamber. The basic concept of determining the initial size of the diameter as the initial reference length is widely available and established, but this reference is only for combustion chambers with non-premixed combustion. No one has discussed the determination of the size of the premixed combustion chamber. The basis for the initial determination of the combustion chamber in this article is the determination of the adiabatic temperature, and the energy balance equation which is simplified to become Black's Principle. This method describes the relationship between the diameter of the combustion chamber, airflow dilution portion and the flame propagation speed that must be met. This method also determines the value of the equivalence ratio, and also length of combustion chamber based on SHR (Space Heating Rate) that must be taken. The results of this method when entering the condition of the combustion chamber inlet 379 K, 2.05 bar, and outlet 879 K, 1.79 bar produce a reference decision of 5 cm diameter, flame speed of 6 m/s, equivalent ratio of 0.8 and 74% cooling portion for a gas turbine mass flow rate of 85.7 g/s.
FABRIKASI DAN PENGUJIAN TELAPAK KAKI PALSU JENIS SINGLE AXIS Wardoyo, Christianus Pigun; Mahardika, Muslim; Suyitno, Suyitno; Dharmastiti, Rini; Salim, Urip Agus; Arifvianto, Budi
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.v15i3.1622

Abstract

Along with the increasing number of persons with disabilities, the need for prosthetic foot has also increased. However, the irony is that some of the products circulating in Indonesia are still imported from abroad, while the domestic product is quite limited and possesses some drawbacks. This study aims to study the production process of the single axis type of the right-side prosthetic foot as well as to evaluate the performance of this product. The prosthetic foot in this research was made from thermoplastic polyurethane (TPU) resin and prepared with casting by pouring it into a pre-fabricated mold. A single-axis type of right prosthetic product could have been successfully made in this study with men's shoe sizes EU 42 and a mass of 654 g. The result of evaluation of the material and foot prosthetic product showed an average Shore hardness value of 54.3 HA. According to the result of compression test, this prosthetic product was also able withstand the highest compressive load up to 259.76 kgf. Finally, the result of fatigue test showed no damage on the foot prosthetic product until 90.000 cycle.
EFFECT OF ANNEALING ON THE MECHANICAL PROPERTIES OF FUSED DEPOSITION MODELING 3D PRINTED PLA Natayu, Amartya; Muhammad, Azka Aulia; Tumada, Azhari; Saptaji, Kushendarsyah; Trisnadewi, Titin; Triawan, Farid; Ramadhan, Anwar Ilmar; Azhari, Azmir
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.v15i3.1625

Abstract

Additive manufacturing or 3D printing is a rapidly moving fabrication technology with many usages in various fields. One of the methods used in 3D printing is Fused Deposition Modeling (FDM), where polylactic acid (PLA) filament is melted and deposited layer by layer to form the desired parts. This study explored the impact of annealing on the mechanical properties of 3D printed PLA specimens. Tensile specimens were produced using FDM following ASTM D638 standards. The specimens were annealed at 95°C and 145°C for 30, 60, and 120 minutes. Two untreated specimens served as benchmarks. Tensile tests were conducted on all specimens to evaluate their mechanical properties. The most optimal result was achieved with annealing at 95°C for 30 minutes, producing Young’s modulus of 3.3 GPA and the highest ultimate tensile strength (UTS) of 38.9 MPa. Other parameters resulted in lower properties compared to the untreated specimens.
PENGARUH TEKANAN VAKUM TERHADAP KEMURNIAN OKSIGEN PADA PROSES VACUUM PRESSURE SWING ADSORPTION: - Sugondo, Amelia; Sutrisno, Teng; Saputra , Richard M. Saputra
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.v15i3.1628

Abstract

Air pollution is an environmental problem that interferes with human health. This pollution is difficult to avoid due to the development of industry and transportation which are not fully environmentally friendly. Air pollution contributes 15-30% of health problems, especially breathing. One of the respiratory diseases is chronic obstructive pulmonary disease (COPD), the highest cause of death of the four other types of respiratory diseases. COPD sufferers need to get fresh air with a high oxygen content. The oxygen requirement can be produced by using cryogenic, adsorption and membrane technology. This study developed equipment for long-term oxygen therapy for COPD patients. Several adsorption methods have been developed, namely Vacuum Swing Adsorption (VSA), Pressure Swing Adsorption (PSA) and Vacuum Pressure Swing Adsorption (VPSA). VPSA was designed and used for this research because it can produce oxygen purity higher and more efficiently than others. This method utilizes vacuum pressure. VPSA was designed with 2 beds containing 13x zeolite added with activated alumina and 1 bed containing carbon molecular sieve (CMS). Experiments were carried out with a vacuum pressure setting of 0.35 bar, 0.5 bar and without vacuum to study the effect on oxygen purity, recovery process and productivity. From the experiments it was found that increasing the vacuum pressure can produce higher oxygen purity, but the opposite is true for recovery conditions from zeolite and oxygen productivity.
PENGARUH VARIASI BENTUK FLAME HOLDER TERHADAP KARAKTERISTIK NYALA API PADA PEMBAKARAN MESO SCALE COMBUSTOR Mochammad Khoirul Rosidin; Yuliati, Lilis; Winarto, Winarto
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.v15i3.1630

Abstract

This study used an experimental method by directly observing the object under study. The independent variables in this study include the geometry of the flame holder on the meso-scale combustor, airflow, and fuel discharge. The research data were analyzed and displayed in graphical form as well as flame visualization. This research concludes that combustion using a flame holder circle has a more stable and even flame compared to a flame holder concentric ring and backward facing step. The shape of the Flame holder circle also produces a higher flame temperature. The results of this study contribute to the development of MPG based on micro combustion with a better understanding of the interaction between flame holders, reactant velocities and equivalent ratios in achieving stable and efficient combustion in meso-scale combustors. This research can provide important input for the development of high-efficiency micro-combustion-based power generation technology in the future.  
KUAT BENDING, FRAKTOGRAFI, DAN STRUKTUR MIKRO HASIL 3D PRINTING BERBAHAN PLA (POLYLACTIC ACID) - TITANIUM Darsin, Mahros; Ismono, Firman Ema; Asrofi, Mochamad; Hermawan , Yuni; Hardiatama , Intan
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.v15i3.1631

Abstract

Manufacturing technology has experienced significant progress with various innovations, including 3D printing. In this study, an innovation was made using a filament made of PLA 60% and titanium 40%. Bending tests are carried out to determine the combination of 3D printing parameters that can produce the most optimal bending strength. This study uses the Taguchi method orthogonal matrix L4(23). The data is processed using Analysis of Variance (ANOVA). The parameters that produce optimal bending strength values are a nozzle temperature of 230 ⁰C, a print speed of 20 mm/s, and a layer height of 0.3 mm, with the highest bending strength value of 7.13 MPa and the lowest of 2.16 MPa. The factors that contributed significantly to the bending strength results were nozzle temperature of 52.84 %, print speed of 15.91 %, and layer height of 1.80 %.
PENINGKATAN EFISIENSI DAN STABILITAS DYE SENSITIZED SOLAR CELL (DSSC) ORGANIK DENGAN ELEKTROLIT POLYETHYLENE GLYCOL Trihutomo, Prihanto; Sholihin, Mohammad Riyadhu
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.v15i3.1637

Abstract

This research will discuss the use of PEG with variations in molecular weight on the stability and efficiency of DSSC. Variations in the molecular weight of PEG used were 4000, 6000 and 10000 which were added to electrolytes containing iodine and potassium iodide using ethanol Pro Analyst as a solvent, then each electrolyte sample was tested for functional groups. Efficiency testing is carried out after the DSSC assembly is complete. Stability testing is carried out by repeated efficiency tests every 5 days after the first efficiency test and is carried out until the third test. The results of the FTIR functional group test showed that there were differences between the electrolyte samples without PEG and the electrolyte samples with PEG addition, but the PEG samples with different molecular weights showed identical functional group readings. The efficiency test results show that the use of PEG increases the efficiency of DSSC compared to DSSC without PEG where the DSSC sample with the lowest PEG molecular weight has the highest efficiency due to the low crystallinity of the polymeric material with low molecular weight thereby increasing ionic conductivity which affects the efficiency increase. The results of the stability test showed that the use of PEG could increase the stability of DSSC where the highest resistance was found in the DSSC with the lowest molecular weight PEG because of its low crystallinity which keeps its ionic conductivity high without being degraded so that efficiency can be maintained.
DESIGN AND STRESS ANALYSIS OF RX-122 ROCKET MOTOR TUBE USING NUMERICAL METHOD Wibawa, Lasinta Ari Nendra; Rusyana, Iyus; Koswara, Dinar; Nugraha, Gagan; Muhdiyat, Diyat; Irawan, Dedi
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.v15i3.1663

Abstract

The RX-122 rocket is an experimental rocket series developed by the Technology Centre for Rocket-BRIN. The lightweight design of the RX-122 rocket motor tube is an essential requirement for improving the rocket's flight performance. The objective of this research is to identify a rocket motor tube design that offers both safety and minimal weight. A total of 12 different design configurations for the rocket motor tube are examined using numerical methods assisted by Ansys software. Aluminium 6061-T6 material was chosen to withstand an internal operating pressure load of 10.5 MPa. The design involves examining a range of wall thickness options, including 4 and 5 mm, cap thickness options of 15 and 20 mm, and fillet radii of 10, 15, and 20 mm. This approach provides a comprehensive and systematic method to achieve optimal structural performance under operational stress conditions, ensuring that only safe yet lightweight configurations are selected. This evaluation, which integrates the exploration of wall, cap, and fillet dimensions, offers an innovative framework to optimize the balance between safety and weight. The findings indicate that only the 12th design, featuring a wall thickness, cap thickness, and fillet radius of 5, 20, and 20 mm, satisfies the specified criteria. The method demonstrates a practical advantage in refining rocket design with high efficiency and accuracy, reducing trial-and-error in experimental setups.

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