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All Journal Jurnal Rekayasa Mesin Jurnal Inovasi Teknologi Manufaktur, Energi dan Otomotif
Novita Sari, Eli
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Aerospace Engineering Automotive Engineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Journal : Jurnal Rekayasa Mesin

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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%.
Co-Authors Anggra, Fiveriati Chairul Anam, Chairul Duratun Nasiqiati Rosady, Siti IGNB. Catrawedarma Ihza Rizaldi, Yusfi Ilmi Maulana, Muhammad Kusnandar M Fauzi Soulton Maknunah, Jauharotul Muzaka, Khairul Rafi Malik, Abdur Ridlo Pamuji, Dian Rimbita, Trismi Satria Prasetya DY, IGNA Soulton, M Fauzi Wahid, M Abdul Wahid, M. Abdul