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INDONESIA
Jurnal Rekayasa Mesin
Published by Universitas Sriwijaya
ISSN : 14116553     EISSN : 23387009     DOI : https://doi.org/10.36706/jrm.v21i1
Core Subject : Science, Engineering,
Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Jurnal Rekayasa Mesin (JRM) Jurusan Teknik Mesin Universitas Sriwijaya adalah sebuah jurnal blind peer-review yang didedikasikan untuk publikasi hasil penelitian yang berkualitas dalam bidang ilmu Teknik Mesin namun tak terbatas secara implisit. Semua publikasi di Jurnal Rekayasa Mesin ini bersifat akses terbuka yang memungkinkan artikel tersedia secara bebas online tanpa berlangganan apapun
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 63 Documents
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Rancang Bangun Turbin Angin Darrieus 3 Sudu Skala Lab Akbar Teguh Prakoso; M. Alif Abiyyu; Dendy Adanta
Jurnal Rekayasa Mesin Vol. 23 No. 2 (2023): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v23i2.539

Abstract

This research aims to design and build a Darrieus wind turbine with three blades on a laboratory scale. The Darrieus wind turbine was chosen because of its efficient design in utilizing wind speed to produce mechanical energy. The research methodology involves several stages, starting from designing turbine blades that use PVC pipes that are heated and formed into flat plates, to designing turbine frames from hollow iron and iron plates. The blade and frame design is optimized to ensure stable and efficient turbine rotation. The turbine is equipped with a washing machine dynamo to increase rotational stability compared to using a fillow block. The research results show that the Darrieus turbine design with three blades is capable of producing stable and efficient rotation. The rotation speed of the turbine is influenced by wind speed, blade area, and blade curve length. Apart from that, the height between the frame and blades also affects the stability of the rotation. The design calculation results show that the turbine sweep area is 24617 m² with a wind speed of 3 m/s resulting in a tip speed ratio of 5 and a turbine rotation speed of 15 m/s. The conclusion of this research is that the Darrieus wind turbine with three blades can function well on a laboratory scale. Proper blade and frame design is critical to achieving stable and efficient rotation. This turbine has the potential to be further developed as a renewable energy solution in Indonesia.
Evaluasi Distribusi Energi Pada Alat Penghemat Energi Vertikal Untuk Penyempurnaan Produk Paten Saputra, M. A. Ade; Alfarros, Muhammad Naufal; Adanta, Dendy
Jurnal Rekayasa Mesin Vol. 24 No. 1 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i1.540

Abstract

This research aims to evaluate energy distribution in vertical energy saving devices in order to improve patented products. The method used includes measuring air flow speed, temperature and enthalpy at several points using an anemometer and digital thermometer. The fuel used is firewood, and the tool is tested with the help of an exhaust fan to draw in combustion gases. The test results show that the heat from the coal stove can be used to dry commodities placed on the shelves above, resulting in energy savings. The average speed of air flow at the exhaust site is 610 m/s, while the average outside air temperature is 285°C and the average exhaust air temperature is 591.4°C. Data analysis shows that the enthalpy values from the kiln to the disposal are irregular due to the inconsistent quality of the charcoal. Apart from that, there is wild air coming in through doors that are not tight enough. The conclusion of this research is that the use of vertical energy saving devices can save heat from coal stoves by utilizing this heat for drying other commodities. However, improvements need to be made to the tool design to reduce stray air entering and increase the consistency of combustion results.
ANALISIS KEKUATAN BEARING PADA MESIN GRANULATOR TERHADAP PEMBEBANAN STATIS MENGGUNAKAN METODE FINITE ELEMENT ANALYSIS (FEA) Bayu Pradana, Muhamad Rizki; Anam, Chairul; Yuniwati, Ika; Umar, Mega Lazuardi; Sari, Eli Novita
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.542

Abstract

The main objective of this study is to develop a highly accurate, high-fidelity model of bearing geometry, which reflects the actual geometry of the bearing to ensure the validity of the analysis. The model will carefully take into account various geometric parameters, such as bearing dimensions and tolerances, and detect potential errors in the model. Simulations are carried out by applying realistic static loads and boundary conditions, close to actual operating conditions, to obtain relevant and practical results. In addition, calculations and analysis of stress distribution throughout the bearing are also carried out, with the aim of identifying stress distribution patterns and determining areas with the highest stress. This analysis is crucial for detecting possible failures and ensuring optimal bearing design. Deformation in various parts of the bearing is measured to understand changes in shape and stiffness of the structure under load. This measurement aims to find the area with the highest deformation and evaluate the bearing response to the applied load. Finally, an evaluation of bearing safety factors is carried out to ensure sufficient safety margins in accordance with industry standards, with the hope of ensuring the reliability and long-term service life of the bearing as well as improving the performance and efficiency of the mechanical systems that use it.
Analisis Pengaruh Kedalaman Potong terhadap Getaran dan Kekasaran Permukaan pada Proses Bubut Material Baja Karbon ST37 Rafi Malik, Abdur; Anam, Chairul; Wahid, M Abdul; Muzaka, Khairul; Novita Sari, Eli
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.553

Abstract

Machine tools play an integral role in the industrial production process, including the manufacturing and repair of components. One of the commonly used machines in the manufacturing industry is a lathe, which is used to cut a rotating workpiece using a tool. One type of steel that is often used is ST 37 steel, which has a carbon content of less than 0.3%. Although highly ductile, the surface hardness of the steel is low and requires modification before being used for certain applications such as the construction of machinery that rubs against each other. Vibration in machinery can cause discomfort, lack of accuracy in measurement, or even damage to the machine. The surface roughness characteristics of the workpiece are also influenced by cutting conditions and cutting tool geometry. Therefore, this study aims to analyze the effect of variations in depth of cut on vibration and surface roughness in the lathe process of carbon steel material ST 37. The results of the research on vibration testing obtained the vibration speed value is influenced by the depth of cut. The greater the depth of cut, the higher the vibration speed, while the smaller the depth of cut, the lower the vibration speed, While the surface roughness test at a depth of cut variation of 0.4 mm, 0.5 mm, and 0.6 mm is obtained with the average value of the HSS tool surface roughness of 2.128 µm, 3.841 µm, and 4.032 µm, respectively.
Analisis Manajemen Termal LiFePO4 (Lithium Iron Phosphate) dengan Pendinginan Bubble Generator dan Tanpa Bubble Generator Ilmi Maulana, Muhammad; Catrawedarma, IGNB.; Novita Sari, Eli; Satria Prasetya DY, IGNA; Ridlo Pamuji, Dian
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.554

Abstract

Lithium Iron Phosphate (LiFePO4) batteries are known for their long life, low self-discharge rate, and stable performance. However, LiFePO4 batteries are prone to thermal problems when operating outside the optimal temperature range of 25-40°C [12], which can threaten the performance, safety, and lifetime of the battery. Previous research has shown cooling systems to be a solution to these thermal issues. However, the use of an internal cooling system risks changing the voltage and causing the battery to overheat. Therefore, an approach using an external cooling system is recommended to maintain the performance of Li-ion batteries without changing their internal components. In an effort to improve the thermal management of LiFePO4 batteries, this study proposes to analyze the use of cooling with bubble generator and without bubble generator. The bubble generator here is intended to increase the random movement of water in the cooling system so that heat absorption becomes more optimal. This study uses a circulating cooling system with water pump media, airator, bubble generator and cooling using water, for the flow container that circulates in the battery cells we use acrilyc mica. The results of the influence of variations in bubble generator testing average temperature values on LiFePO4 batteries of 16.26ºC to 23.94ºC. and the influence of variations in testing without bubble generators average temperature values on LiFePO4 batteries of 17.62ºC to 25.57ºC, From this study it can be concluded that the bubble generator is able to cool 90% of the operational temperature 25-40 °C.
Studi Eksperimental Pemisah Minyak-Air Menggunakan Hidrosiklon-Bubble Generator berdasarkan Variasi Diameter Underflow Rimbita, Trismi; Catrawedarma, IGNB.; Novita Sari, Eli; Wahid, M. Abdul; Fiveriati, Anggra
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.555

Abstract

Oil and water are two liquids that are often usedby both the public and industrial companies. Mixing oil and water need to be separated in various industries such as waste processimg, oil and gas production, and other industrial processes. Hydrocyclone is a separation method with the principle of sparation based on specific gravity which utilizes centrifugal fore by adding a bubble generator to the input section and adding variations in the underflow diameter. This research aims to analyze the performance of a hydrocyclone bubble generator based on underflow variations as oil-water separation. This bubble generator is used to make it easier to suck in air. The variations in underflow diameter used are 10mm, 15mm and 20mm. This research was carried out inject a mixture of oil and water into a hydrocyclone system as a sparation medium. The air flow injeted into the bubble generator uses air flow variations of 0.1, 0.6 and 1.2 lpm (liters/minute). From the research that has been carried out, the results show that the larger the underflow opening, the greater the pressure in the underflow, so that the underflow pressure drop is greater. The smaller the underflow opening, the greater the overflow pressure, so the overflow pressure drop is greater. The greater the input air flow, the greater the difference in underflow and overflow pressure drop. The smaller the valve opening, the lower the efficiency of oil separation in overflow and the greater the efficiency in underflow. The highest efficiency results on overflow are 88.6%.
Pengaruh Parameter Eksternal Proses 3D Printing terhadap Kekuatan Tarik Hasil Cetak Filament PLA + Alfidera, Mohammad; Finali, Asmar; Anam, Chairul; Fauzi Hanafi, Agung; Bhisma Wisnu Wardhana, Prabuditya
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.556

Abstract

In the industrial world, plastic is becoming increasingly popular alongside metal, especially in the field of research, thanks to the modernization of 3D printer usage. FDM (Fused Deposition Modeling) technology allows for the creation of 3D objects from digital models using additive manufacturing methods, with melted filament. This technology is popular due to its ease of use, low cost, environmental friendliness, and efficiency in product development. However, FDM products have weaker mechanical properties compared to injection molding because of weak points between the layers. Therefore, precise parameter settings are crucial to improving the tensile strength of the filament. Tensile testing is conducted to measure the strength of 3D printed products, showing that varying the printing orientation and layer height can enhance the mechanical properties of FDM objects. Research results indicate an average tensile strength of 28.5 MPa for ABS and 56.6 MPa for PLA, with elastic moduli of 1807 MPa and 3368 MPa, respectively. Further testing found differences in tensile strength among various combinations of Concentric and Rectilinear external patterns, with the Concentric pattern at 210°C producing the highest tensile strength of 61.49 MPa, and the Rectilinear pattern at 220°C producing the lowest tensile strength of 54.80 MPa. Comparative analysis shows that the Concentric pattern at 220°C has the highest ratio of 0.015, while the Rectilinear pattern at the same temperature has the lowest ratio of 0.0132. These results emphasize the importance of process parameter analysis to improve the tensile strength and material efficiency of 3D printed products.
ANALISIS PERFORMA PROTOTIPE SISTEM PEMBANGKIT DAYA LISTRIK TERINTEGRASI PADA RODA KENDARAAN LISTRIK Muhammad Luthfi; Luthfi, Muhammad; Sifa, Agus; Fajri, Ade Ruli Nurul; Alfiansyah, Agil
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.1302

Abstract

The increasing use of electric bicycles and motorcycles in Indonesia has opened up significant opportunities for advancements in this type of vehicle, including the utilization of wheel rotation during operation. This research aims to evaluate the performance of a prototype electric power generation system directly installed within the wheels of electric bicycles or motorcycles. Quantitative research data were collected using experimental methods by measuring voltage, electric current, and battery charging time derived from the generated current under varying wheel rotation speeds and the number of stator coil poles. From the system testing results, the highest average voltage and current, along with the shortest battery charging time, which were 11.64 V, 2.29 A, and 20 minutes, respectively were achieved under conditions with the maximum number of stator poles and the highest rotation speed of 12 stator poles and a rotational speed of 1119.8 rpm respectively, which was equivalent to a travel speed of 73.88 km/h. In addition, the effect of addition of poles to the generated electricity power is not as significant as the change of the wheel rotation speed.
ANALISA IMPAK PADA DESAIN KARAKURI KAIZEN TROLLEY DAN RAK STATIK DUA TINGKAT DENGAN METODE FEA Amat, Mohammad Azwar; Luthfi, Muhammad; Badruzzaman, Badruzzaman; Hidayatulloh, Deni
Jurnal Rekayasa Mesin Vol. 24 No. 2 (2024): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v24i2.1305

Abstract

Karakuri kaizen is an approach to improve the efficiency of the production process by utilizing simple mechanisms that rely on the principles of mechanics without external energy (such as electricity or pneumatics). In this study, the impact analysis on the critical part of the karakuri kaizen design uses analytical and simulation methods. Simulation methods are divided into motion study, stress, strain, displacement, and velocity analysis. Impact simulation on dynamic rack mechanical stopper and impact simulation on static rack stopper. The results of analytical calculations and simulations on the box speed show that there are similarities in the time value and final speed of the box before stopping. The results of the impact simulation show that in the mechanical stopper path (a) the bolt pretension factor is still in a neutralized condition so that its effect is more dominant than the load on the box, the max stress ranges from 550-560 MPa and the strain is at 0.0025-0.0029. While the stopper path (b) oscillates with a max stress ranging from 270-320 MPa and a strain is at 0.002-0.0026. The box speed after impact is much greater than the input speed, due to the absence of a damping system, and the mass multiplier on the stopper being too large.
Analisa Beban Pendingin Ruangan AC Ruang Auditorium Gedung Pusat Lantai 7 Universitas PGRI Semarang Ramadhani Saputra, Ananta; Spuriyadi, Slamet; Farikhah, Irna
Jurnal Rekayasa Mesin Vol. 25 No. 1 (2025): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v25i1.1379

Abstract

The Auditorium Room on the 7th Floor of the Central Building at Universitas PGRI Semarang is frequently used for various academic and non-academic activities, making cooling load analysis essential to maintain room temperature and humidity comfort. This study aims to determine the cooling capacity required in the auditorium. The methods employed include direct data collection through measurements, such as the number of occupants, electronic equipment, and room dimensions. Cooling loads were calculated by considering sensible and latent loads; sensible loads were measured based on temperature and equipment quantity, while latent loads were calculated based on air humidity. This study identified the total cooling load for the Auditorium Room on the 7th floor of the Central Building at Universitas PGRI Semarang as 115,155.501 Btu/hr. This cooling load consists of 82,381.608 Btu/hr of sensible load and 32,773.893 Btu/hr of latent load. The cooling load includes various factors, such as: Internal loads from occupants, electronic equipment, and lighting. External loads from glass radiation, walls, floors, roofs, and ventilation. The analysis results indicate that the current AC capacity needs to be reassessed to ensure its capability to achieve ideal room temperature and humidity.

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