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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 503 Documents
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Automatic Tobacco Dryer Refrigeration System Optimization Using PLC and SCADA Syahid Syahid; Mochamad Muqorrobin; Yusnan Badruzzaman; Aggie Brenda Vernandez; Akhmad Jamaah
Jurnal POLIMESIN Vol 21, No 1 (2023): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i1.3188

Abstract

In many cases, tobacco leaves are still dried using conventional methods, which relies merely on sunlight, thus making it difficult for farmers to dry them in the rainy season. Tobacco leaves rot easily, so alternative drying methods that are not weather dependent are required. Our research offers a solution by making a tobacco leaf drying machine with a refrigeration system. This tool can accommodate 5 kg of tobacco and can be controlled by a PLC and monitored using SCADA. The drying test was carried out at a temperature setting of 40°C–50°C and a humidity of around 25%–55%. The first test was drying 1 kg of tobacco leaves with a moisture content of 30%, which required a drying time of up to 2 hours and 40 minutes. After the drying process, the average weight of tobacco leaves became 287.8 g with a moisture content of 12%. The second test was the drying of 5 kg of tobacco leaves with a moisture content of 30%, which required a drying time of up to 4 hours and 15 minutes. After the drying process, the weight of the tobacco leaves was 880 g and the moisture content was 11.5%. The test results show that tobacco leaves can be dried without changing their original color and shape, even though they had experienced a decrease in mass and water content.
Biomechanics and biocompatibility assessment of bone drilling for surgical application: asystematic literature review Lenggo Ginta, Turnad Lenggo Ginta; Mujiarto, Mujiarto; Jufriadi, Jufriadi; Setyobudi, Nanang; Yulianto, Katri; Febriansyah, Dwi Jaya; Azka, Muizuddin
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4749

Abstract

This systematic literature review delves into the intricate relationship between biomechanics and biocompatibility within the context of bone drilling for surgical applications. It meticulously analyzes the forces, stresses, and strains that bone undergoes during drilling, shedding light on essential variables crucial for enhancing surgical efficacy. Moreover, it scrutinizes the mechanical attributes of drilling tools, particularly drill bits, assessing factors such as material composition, design intricacies, and heat generation, all of which profoundly influence drilling performance. The review also thoroughly investigates the implications of drilling materials on bone tissue biocompatibility, addressing concerns such as corrosion, wear debris, and potential toxicity. By synthesizing current research, it offers up-to-date insights into advancements and strategies aimed at overcoming challenges in bone drilling. Ultimately, this review serves to refine bone drilling techniques, advocating for safer and more efficient surgical practices, and ultimately aiming to improve patient outcomes through a comprehensive understanding of biomechanical and biocompatibility considerations.
Kekuatan impak baja ST 60 di bawah temperatur ekstrim Zuhaimi Zuhaimi
Jurnal POLIMESIN Vol 14, No 2 (2016): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v14i2.341

Abstract

Kegagalan pada suatu konstruksi permesinan kemungkinan bisa terjadi, namun dapat dihindari dengan melakukan kajian-kajian dan penelitian. Penelitian ini dilakukan dengan tujuan untuk mengetahui kekuatan impak (impact strength) terhadap material baja karbon ST 60 pada berbagai temperatur, terutama pada temperatur ekstrim melalui uji impak charpy. Pengujian dilakukan melalui empat tahapan, yaitu: (1) mempersiapkan spesimen pengujian; (2) melakukan pengkondisian spesimen pada berbagai perlakuan temperatur; (3) melakukan pengujian impak charpy; dan (4) melakukan pengamatan perpatahan. Spesimen disiapkan dalam bentuk standar mengikuti ASTM E 23 sejumlah 24 buah sesuai dengan rancangan penelitian untuk 8 variasi temperatur dengan masing-masing 3 kali perulangan. Untuk mengkondisikan temperatur dapat dilakukan dengan menggunakan dapur pemanas (furnace) dan dry ice + alkohol 70% serta nitrogen cair. Pengujian impak dapat dilakukan dengan menggunakan alat uji impak charpy dan pengujian perpatahan (fractographi) dapat dilakukan dengan menggunakan Stereoscan Microscope. Hasil yang diperoleh menunjukkan bahwa, harga kekuatan impak material ST 60 terendah terjadi pada temperatur yang sangat ekstrim (-20 0C), yaitu sebesar 0,111 Joule/mm2, dan yang terbesar pada temperature 200 0C dengan harga 0,836 Joule/mm2. Temperatur transisi dari ulet ke getas untuk material ST 60, terjadi antara temperatur 0 0C sampai 150 0C, dimana pada rentang temperatur ini menunjukkan energi impak terjadi kenaikan yang tajam.Kata kunci: Baja karbon ST 60, impak charpy, kekuatan impak, perpatahan.
Pengaruh media pendingin terhadap kekerasan dan ketangguhan hasil pengelasan material AISI 1050 pada proses las MAG Azwinur Azwinur; Muhammad Yudi; Zulkifli Zulkifli
Jurnal POLIMESIN Vol 18, No 2 (2020): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i2.1924

Abstract

The temperature of the cooling medium is a substance that serves to determine the speed of the cooling process of the material that has been given heat treatment from the welding results. Cooling is an alternative to improve and improve the mechanical properties of post-welding materials. The selection of the temperature of the cooling medium is very important to get a good connection strength. The purpose of this study was to determine the effect of the cooling media on the hardness and toughness of AISI 1050 material using the MAG welding process. The cooling media which are varied are water, sea water, and air. The welding process used is the welding process MAG (Metal active gas) with CO2 protective gas, the material used type AISI 1050 with mechanical testing hardness and impact test. The results showed that the use of the type of cooling media affects the strength of the welding joint in terms of the value of the hardness and toughness of the material receiving the load. The highest hardness value in the HAZ 1, HAZ 2 and weld metal areas occurs in the use of sea water cooling media where in HAZ 1 is 71, 63, HAZ 2 is 73.5 and weld metal is 70, while the lowest value in the use of air conditioning media where on HAZ 1 of 65.63, HAZ 2 of 63.75 and weld metal of 58.83. The impact toughness test results found that the use of seawater cooling media has the highest toughness value of 1.83 joules / mm², then followed by air media of 1.75 joules / mm², and the lowest is the water use of 1.50 joules / mm² .
Computational analysis of magnetohydrodynamic effects on biodiesel flow rate Tatun Hayatun Nufus; Candra Damis Widiawati; Ahmad Indra Siswantara; Gun Gun Ramdlan Gunadi; Dianta Mustofa Kamal; Asep Apriana; Dela siska; Bayu Prasetio; Irfan Hermansyah Saputra
Jurnal POLIMESIN Vol 21, No 2 (2023): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i2.3292

Abstract

The purpose of this research  is to determine the velocity characteristics of fluid (fuel) flow in a pipe surrounded by a minimal magnetic (electromagnetic) field strength by using computational fluid dynamics simulations. For a more detailed discussion, Magnetohydrodynamics (MHD) theory is used, which is a branch of science that studies fluid flow that can conduct electric current due to the influence of a magnetic (electromagnet) field. The fuel used is B0, B10, B20 and B30. The magnitude of the electromagnetic field used is 0.15 Tesla. the result is that the flow rate of B0 fuel has decreased by 0.623%. B10 fell to 0.41%. The B20 was down 0.618% and the B30 was down 0.648%. Thus the magnetic field strength of 0.15 Tesla is able to change the speed of the fuel flow even if only slightly. This information is needed as a basis for the development that the magnetic field is able to change the value of the flow velocity, this will provide information related to improving the quality of combustion and fuel savings in the future.
Analisa pengaruh variasi media pendingin pada perlakuan panas terhadap kekerasan dan struktur mikro baja karbon rendah Agung Prayogi; suhardiman suhardiman
Jurnal POLIMESIN Vol 17, No 2 (2019): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v17i2.1024

Abstract

Perkembangan ilmu pengetahuandan teknologi yang semakin pesat sangat berpengaruh terhadap perindustrian didalam negeri, salah satunya adalah  industri yang menghasilkan atau memproduksi elemen-elemen mesin yang sebagian besar menggunakan logam sebagai bahan bakunya. Penelitian ini betujuan untuk mengetahui pengaruh media pendingin  terhadap tingkat kekerasan dan struktur mikro baja karbon paduan rendah dengan melakukan perlakuan panas sebelum dan sesudah proses pemanasan (heat treatment). Proses penelitian dilakukan dimulai dengan pemotongan baja karbon rendah, kemudian dilakukan proses pemanasan dengan temperatur 950˚C, selanjutnya dilakukan proses pendinginan dengan berbeda media pendingin seperti: Air hujan, udara, Oli SAE 40 dan Coolant Radiator. Hasil pengujian kekerasan pada spesimen sebelum dilakukan proses pemanasan didapat nilai kekerasan sebesar 27,75 HRC dan untuk struktur mikro spesimen mengandung struktur ferrit dan perlit. Didapat untuk media pendingin air hujan didapat nilai kekerasan 34 HRC dan untuk struktur mikro yang terkandung yaitu martensit, untuk media pendingin oli SAE 40 nilai kekerasan pada spesimen didapat sebesar 28,85 HRC untuk struktur mikronya spesimen mengandung struktur ferrit dan perlit, untuk media pendingin coolant radiator didapat nilai kekerasan paling tinggi sebesar 39 HRC dan untuk struktur mikronya spesimen mengandung struktur martensit dan untuk media pendingin udara mendapatkat nilai kekerasan terendah dari media pendingin lainya yaitu sebesar 14 HRC dan spesimen tersebut untuk struktur mikro yang terkandung yaitu ferrit dan perlit. Kata kunci : Uji Struktur Mikro, Uji Kekerasan, Diagram Fasa, Cairan pendingin.Effect of cooling media variations on heat treatment on hardness and micro carbon  structure of low carbon steelAbstractThe rapid development of science and technology has greatly influenced the domestic industry, one of which is the industry that produces or produces engine elements which mostly use metal as their raw material. This study aims to determine the effect of the cooling media on the level of hardness and microstructure of low carbon alloy steel by conducting heat treatment before and after the heating process (heat treatment). The research process was carried out starting with the cutting of low carbon steel, then the heating process was carried out with a temperature of 950˚C, then the cooling process was carried out with different cooling media such as: Rainwater, air, SAE 40 Oil and Coolant Radiator. The results of the hardness test on the specimens before the heating process were obtained were hardness values of 27.75 HRC and for the microstructure the specimens contained ferrite and pearlite structures. Obtained for rain water cooling media obtained hardness value of 34 HRC and for microstructure contained namely martensite, for SAE oil cooling media 40 hardness values on specimens were obtained at 28.85 HRC for microstructure of specimens containing ferrite and perlite structures, for coolant cooling media The radiator obtained the highest hardness value of 39 HRC and for the microstructure the specimen contained a martensitic structure and for the air cooling media the lowest hardness value from other cooling media was 14 HRC and the specimens for the microstructure contained were ferrite and perlite. Keywords:Micro Structure Test, Hardness Test, Phase Diagram, Coolant
Study on process parameters effects to burr height in drilling of Aluminium 6061 alloy sheet on CNC milling machine Nguyen Huu Tho; Nguyen V. A. Duy; Dinh Tien Dung; Nguyen M. Huy; Nguyen V. Thanh; Jannifar Jannifar
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i1.2116

Abstract

Productivity and quality of drilling are also of interest, have been paid more attention on the size of burr through the cleaning process. The presence of burr on drilled workpieces creates problems not only in the processing but also in the assembly line, affecting the accuracy of the assembly. Many factors have significant impacts on the burr height such as spindle speed, cutting feed and drill bit diameter. In this paper, the experiment investigation of those process parameters to burr height is implemented, then Taguchi-based approach is used to determine the influence density of each factors. Moreover, artificial neural network model is applied to predict the burr height based on the three input factors. The experiment results showed that the two most important factors affecting the burr are the speed of the spindle and the feed rate. The factors realized to be significant for burr formulation such as an 8 mm drill bit diameter, a CNC spindle speed of 2500 rpm, and feed rate of 70 mm/rev, which will result in the smallest output in terms of the height of the obtained burr is 0.12792 mm.
Experimental study of geometric error of CNC turning machine tools based on ISO 13041-6 Herman Budi Harja; Elan Suherlan; Nandang Rusmana; Dhion Khairul Nugraha
Jurnal POLIMESIN Vol 21, No 4 (2023): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i4.3982

Abstract

The product quality of machining results is greatly influenced by the accuracy and precision of CNC lathe machine tools. Regular inspection of the geometric inaccuracy of the machine tool is necessary to verify its operational viability. This research contribution focuses on conducting experimental studies to evaluate machine tool geometric error. The aim is to explore cost-effective measurement methods as alternatives to direct measurements, which often involve laser interferometers and ball bar tests. The objective of this study is to investigate the geometric inaccuracy of a CNC turning machine by conducting experimental cutting tests in accordance with ISO 13041-6:2009. The testing will utilize conventional workpiece forms and requirements, including circularity features, flatness, circular features, and maybe combination features. Several geometric errors that can be acquired with this method include circularity errors, linear positional errors, and squareness errors. The cutting test for each workpiece feature of the given shape and specification requires the use of 5 specimens. Consequently, the mean value of the geometric error may be computed. The geometric error value is derived by the analysis of measurement data collected from a Coordinate Measuring Machine (CMM) applied to a specimen of the machined workpiece. Moreover, the evaluation of the geometric error condition of machine tools is ascertained through the comparison of the average data for each category of geometric error against the permissible standard values given in ISO 10791-2, ISO 10791-4, and ISO 13041-4. The findings of the study indicate that the implementation of the object machine study is not viable for the production of machined workpieces of satisfactory quality. This is primarily due to the presence of geometric errors in CNC turning that exceed the acceptable tolerance levels. Specifically, these errors manifest as linear positional deviations along multiple coordinates along the X-axis and Z-axis, as well as squareness deviations between the X-axis and Z-axis. The maximum value of the linear positional error along the X-axis is 55.2 μm, while the maximum value of the linear positional error along the Z-axis is 25.6 μm. Additionally, the greatest observed squareness error is 37.3 μm. The X and Z machine axes exhibit deviations beyond acceptable limits in terms of unidirectional accuracy and unidirectional repeatability, as per the established norm
Effects of the Addition of Coconut Shell Oil on Diesel Engine Performance: An Experimental Study Agung Nugroho; Fajrin Lumela; Rita Dwi Ratnani
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i2.2847

Abstract

Biodiesel is one of the efforts to reduce dependence on fuel oil developed as an environmentally friendly alternative fuel in Indonesia. The addition of coconut shell oil will change the biodiesel properties and engine performance. This study aims to determine the physical properties and performance of fuel in diesel engines due to the addition of coconut shell oil. Several methods were applied to test the physical properties of biodiesel, namely: viscosity, density, cetane number, and calorific value. Meanwhile, the parameters for engine performance testing include torque, power, and specific fuel consumption. Biodiesels used were CS-20 and CS-40 for physical properties tests, and CS-10, CS-15, and CS-20 for engine performance tests. The results found that CS-20 had density of 842 kg/m3, kinematic viscosity of 3.958 mm2/s, cetane number of 62.4, flash point of 305.06°C, and heating value of 43,681.72 kJ/kg. For CS-40, the density was 867 kg/m3, the kinematic viscosity was 1.773 mm2, and the calorific value was 43,390.74 kJ/kg. Based on the results of the diesel engine performance test, the highest torque value was 31.487 Nm on Dexlite at 967 rpm rotation with a mass of 9.51 kg, while the highest power was 4.021 kW on Dexlite at 1752 rpm rotation and torque of 21.919 Nm. The best specific fuel consumption on Dexlite at 3563 rpm rotation used 0.527 liters/kWh. In conclusion, the addition of coconut shell oil to Dexlite reduces energy as the calorific value decreases. Furthermore, it is proven that due to the addition of coconut shell oil, the engine performance is decreasing.
Performance test of small fishing vessel refrigeration machine for fish storage Siahaan, Juniawan Preston; Yaqin, Rizqi Ilmal; Demeianto, Bobby; Tumpu, Mula; Abrori, Muhammad Zaki Latif; Priharanto, Yuniar Endri; Pradana, Syahrul
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4165

Abstract

The refrigeration system in the fishing process is important for maintaining the quality of the catch. However, the design of small-scale refrigeration machines is still not common, so it is an interesting study. Therefore, this study aimed to evaluate the design of small-scale fishing vessel refrigeration machines. Field studies are needed in machine manufacturing to observe the components required to match the refrigeration machine components onboard fishing vessels. This uses a direct observation method to determine the components of the refrigeration machine on the ship. Furthermore, the performance of the machines produced will be tested through the load cooling process. Parameters determined in the performance test include monitoring temperature (suction and discharge), pressure (suction and discharge), evaporator temperature, load temperature, COP (Coefficient of Performance), and compressor power. Refrigerant temperature measurement uses an insulative principle so that ambient temperature does not affect it. The result is that the machine produced has a capacity of 35 l or 15 kg of load. Meanwhile, in the performance test, the COP and electrical power generated while cooling the load for approximately 4 hours were 2,42 and 507 W, respectively. The results of this design were successful and did not experience failure. The significanceof this study can be used as a reference source for making cooling machines for storing the catch of small-scale fishermen.

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