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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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Comparative study of performance of temiki (Melastomacandidum) and rubek (Calotropis gigantea) extract inhibitors for carbon steel in corrosive media Supardi, Joli; Rizal, Samsul; Ali, Nurdin; Fonna, Syarizal; Ikramullah, Ikramullah; Veranita, Veranita; Arifin, A.K.
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.v21i6.4577

Abstract

The use of synthetic inhibitors that negatively affect the environment is still used. Organic inhibitors are the best and most environmentally friendly solutions such as Temiki plants (MelastomaCandidum) and Rubik (Calotropis Giganteen) which have good corrosion cell inhibitor properties and have the potential to be used as corrosion inhibitors. This study analyzed Temiki and Rubik extracts as corrosion inhibitors in carbon steel using the weight loss method in 3.5% NaCl solution and analyzed the efficiency of the inhibitors. Temiki and Rubik's are extracted by drying the leaves, stems and flowers under the sun. Then the material is mashed together and distilled by the solid-liquid method with the Soxhlet tool. Identification of plant components using Gas Chromatography-Mass Spectrometry (GC-MS). Density and viscosity were analyzed following ASTM D 4052 and ASTM D 445 standards. Weight loss method testing was carried out at inhibitor concentrations of 200, 300, 400 and 500 ppm, with soaking time for 15 weeks and data collection was carried out every week. The results of the analysis showed the highest corrosion rate in Temiki extract with a concentration of 500 ppm reaching 1,569 mpy and the lowest at a concentration of 500 ppm reaching 0.157 mpy. In Rubik's extract inhibitors, the highest corrosion rate occurred in 500 ppm inhibitors reaching 1,268 mpy, while the lowest occurred at 200 ppm concentrations reaching 0.331 mpy. The highest efficiency value is the 400 ppm Temiki inhibitor with efficiency reaching 82.89% and the lowest at 500 ppm reaching 19.55%. while for the efficiency of Rubik's extract inhibitors, the highest value was 62.71%, at a concentration of 200 ppm. While the lowest is 28.40%, at 500 ppm inhibitors. These results show that Temiki and Rubik's extracts can still function well as corrosion inhibitors in low-carbon steels in NaCl solution.
Pelapisan baja dengan logam chrom terhadap kekerasan permukaan melalui proses electroplating Ramli Usman
Jurnal POLIMESIN Vol 2, No 1 (2004): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jop.v2i1.1402

Abstract

Elektroplating adalah salah satu proses pengendapan atau dekomposisi suatu logam yang dikehendaki diatas logam lain dengan cara elektrolisa. Kalau ditinjau lebih jauh dengan proses electroplating ini akan diperoleh sifat teknis permukaan pelapisan baja dengan khrom yang gunanya untuk meningkatkan kekerasan dari pada logam asalnya. Tujuan penelitian ini untuk mengukur harga kekerasan suatu baja sebelum dan sesudah dilapisi dengan bahan logam khrom. Berdasarkan hasil penelitian dapat disimpulkan bahwa harga kekerasan baja setelah dilapisi dengan khrom berpengaruh terhadap harga kekerasan baja sebelum dilapisi dengan krom.
Performance Analysis Cooling Tower Type Induced Draft with PVC Plate Filling Material Mochamad Rizky Pradana; Astrie Kusuma Dewi; Natasya Aisah Septiani; Asepta Surya Wardhana; Muhammad Ramdhan; Wendy Triadji Nugroho
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.v21i1.3185

Abstract

In the industry, savings in water use are needed, so that the output water from the condenser will be recirculated for reuse so that it does not need new water. The output of the condenser, which is hot water with a temperature of 45 °C, needs to be conditioned to a normal temperature. So they designed a cooling tower to reduce the temperature of the hot water through direct contact with the air. Filling material is a component that is very influential on the performance of the cooling tower because, in this material, there is direct contact between hot water and dry water in opposite directions. The purpose of this study was to determine the height of the PVC plate filling material that has adequate effectiveness so that the hot water in the cooling process runs optimally. In this study, several tests were carried out that showed the performance of the cooling tower, including range, approach, cooling effectiveness, cooling capacity, and the rate of evaporation of water into the air. So from this research, it was found that the optimal height of fill material is 20 cm, which has the highest relative humidity (RH) of the outgoing air, which is 87.2%, and the lowest exit air temperature of 29.3°C
Effect of heat input on the microstructure and hardness of AISI 321 stainless steel welds using ER 347 filler metal Oktadinata, Herry; Purnama, Dewin; Anugrah, Debby Laksana
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.v22i2.4945

Abstract

Stainless steel is widely used in various fields, one of which is AISI 321, which is used for high-temperature applications because of its high resistance to creep and intergranular corrosion. The type of filler metal and heat input on stainless steel welds play an essential role in determining the microstructure and mechanical properties of the welded joints. The purpose of this experiment was to evaluate the microstructure and mechanical properties of AISI 321 stainless steel welds with variations in heat input. This study is expected to explore the performance of this weld joint, which can be anticipated in relevant fields. The welding method used in this experiment was Gas Tungsten Arc Welding (GTAW) with ER 347 as filler metal. Welding was carried out on three samples with a heat input of 0.92 kJ/mm, 0.64 kJ/mm, and 0.52 kJ/mm, respectively. The tests included tensile strength, Vickers microhardness, and microstructure observations. The tensile test results showed that a fracture occurred in the Base Metal (BM) area, indicating that the strength of the weld joint was higher than that in the BM. The Vickers microhardness test results showed that the Weld Metal's hardness (WM) was the highest, followed by the Heat-Affected Zone (HAZ) and BM. The welding experiment that used three variations in heat input demonstrated that higher heat input lowered the hardness of the weld joint. The microstructure observation results around the fusion line demonstrated the presence of step and ditch structures. The ditch structure indicates intergranular corrosion.
Penentuan sudut posisi sudu arah horizontal untuk pengembangan sudu model furrower aerator kincir Samsul Bahri
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.v14i2.339

Abstract

Tingkat keberhasilan usaha budidaya tambak secara intensif sangat dipengaruhi oleh kemampuan petani untuk mengatasi penurunan kualitas air yang salah satunya masalah kelarutan oksigen yang rendah melalui proses aerasi. Salah satu tipe alat aerasi yang umum digunakan adalah aerator kincir karena merupakan aerator yang paling baik dari segi mekanisme aerasi dan tenaga penggerak yang dapat digunakan. Namun aerator ini masih memiliki kinerja aerasi yang rendah sehingga biaya operasional kincir untuk pengelolaan budidaya tambak masih tinggi. Selama ini usaha peningkatan kinerja aerasi dilakukan dengan pengembangan sudu secara dua dimensi. Hal ini tidak memberikan hasil yang optimal karena kebutuhan daya untuk aerasi berbanding lurus dengan kenaikan laju aerasi. Pengembangan sudu tiga dimensi merupakan salah satu alternatif solusi. Sudut posisi sudu arah horizontal merupakan parameter desainnya. Penelitian bertujuan mendapatkan sudut posisi sudu arah horizontal untuk pengembangan sudu tiga dimensi. Kincir yang digunakan mempunyai sudu delapan buah, ukuran sudu 15x20 cm dengan diameter lubang sudu 16 mm dan sudut posisi sudu arah vertikal 45º. Variasi sudut posisi sudu arah horizontal dilakukan pada 0º, 15º dan 30º dengan putaran kincir 115, 135 dan 154 rpm pada kecelupan sudu 12 cm. Pengujian dilakukan untuk mendapatkan torsi dan daya listrik yang digunakan dan volume penutupan semburan yang dihasilkan sebagai kesamaan dari laju perpindahan oksigen yang terjadi. Hasil pengujian terbaik dihasilkan pada sudut posisi sudu arah horizontal 30º dengan putaran kincir 154 rpm yaitu torsi 46.70 N, daya listrik 564.39 Watt, dan volume penutupan semburan 4.55 m3.Kata Kunci: aerator kincir, sudut posisi sudu arah horizontal, torsi, daya listrik, volume penutupan semburan.
Penggunaan material berubah fasa sebagai penyimpan energi termal pada bangunan gedung Hamdani Umar
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.v18i2.1832

Abstract

The energy consumption of the world building sector reaches 30% of overall energy consumption and accounts for one third of greenhouse gas emissions worldwide. Thermal energy storage is a simple and effective technique to be applied to buildings to improve building energy efficiency, and is expected to reduce the environmental impacts associated with energy use. Thermal storage by utilizing phase change material (PCM) is the most promising technique because of its high energy storage capability and small temperature changes. The combination of building materials and PCM is an efficient way to increase the thermal energy storage capacity of building components for the purpose of storing thermal energy directly in buildings. In this study the results of testing the use of beeswax as a phase change material in building concrete are given. The test results of concrete equipped with beeswax as PCM decreased the strength of the concrete but on the other hand it was able to absorb and store heat energy. The results of application analysis in buildings are able to reduce indoor cooling loads. 
Numerical-hydrodynamic analysis, vickers hardness, and tensile test of cast-brass alloy for boat propellers Akhyar Akhyar; Iqbal Iqbal; Muhammad Bahi; Ahmad Farhan; Seab Piseth
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.v21i2.3743

Abstract

Computational Fluid Dynamics (CFD) has been applied to simulate boat propellers. The material for boat propellers generally uses a brass alloy metal which is produced by a casting process. The purpose of this study was to simulate CFC propellers, evaluate the hardness and tensile strength of samples cast from the brass alloy used to produce ship propellers. The methods show that turbulent kinetic energy, density streamline characteristic, and velocity distribution are simulated boat propellers with CFD applications. Furthermore, the propeller is cast to observe the surface hardness and tensile strength of the cast alloy. The results revealed that the boundary conditions - which served as the simulation's input parameters, the geometry of the rotating and stationary domains, the geometry and type and number of gratings, the geometric accuracy of the propeller model, mass flow rate, rotational angular velocity, and stationary angular velocity - all had a significant impact on the parameters. Brass alloy and cast alloy raw material hardness values were measured on the surface of the propeller casting product. While 128 HV was attained after casting, the average hardness value for solid cylinders manufactured of the raw metal alloy was 171.67 HV. The three test sessions' stress vs. strain graphs were produced using the Cu-Zn alloy metal's tensile test results. The cast Cu-Zn alloy has a maximum tensile strength of 352 MPa and a maximum yield stress of 330 MPa.
Effect of rotation on achieving constant voltage in three-phase self-excited induction generator for small scale wind turbines application Syuhada, Ahmad; Tarmizi, Tarmizi; Akhyar, Akhyar
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.5279

Abstract

Three-phase Self-Excited Induction Generators (SEIGs) are commonly employed for electricity generation in remote or isolated areas. SEIGs are preferred in such regions due to their ability to create a magnetic field by adding a capacitor to one of their terminals. Nevertheless, a significant challenge in utilizing SEIGs is maintaining a consistent output voltage in the presence of load fluctuations. This study aims to investigate the impact of generator rotation on the SEIG's output voltage and determine the optimal rotation speed required for achieving a stable output voltage. Ensuring stable voltage regulation is crucial to guarantee the proper functioning of all loads connected to the SEIG. Furthermore, operating the SEIG in parallel with other generators is advantageous. The methodology employed in this study involves varying the load supplied by the SEIG at different capacitor values. Unwanted voltage variations occur due to load fluctuations within a generating system or SEIG. Adjustments to the generator's rotation speed are made to uphold a uniform voltage level. The variables considered in this study include the generator's rotation speed, capacitor size, and load fluctuations. Simulation results demonstrate that the SEIG's output voltage is affected by the generator's rotation speed, and maintaining a consistent voltage necessitates appropriate adjustments to capacitor values and generator speed. This research enhances understanding of SEIG characteristics and offers guidance on effective settings for maintaining a stable output voltage at various generator rotation speeds. Future research can focus on practically implementing these findings to enhance the performance of SEIGs in real-world applications
Studi perhitungan sistem pengkondisian udara dari desain kantor pabrik kelapa sawit berbasis cooling load temperature difference Sabilly Handi Pradana; Deni S Khaerudini
Jurnal POLIMESIN Vol 19, No 2 (2021): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v19i2.2093

Abstract

Perhitungan sistem pengkondisian udara diperlukan agar kebutuhan penggunaan total daya masih dalam rentang yang diizinkan. Sehubungan terbatasnya sisa daya yang tersedia dari pabrik kelapa sawit (PKS) untuk suplai ke sistem pengkondisian udara sebesar 184 kW, diperlukan perhitungan untuk mendapatkan total beban pendingin yang terdiri dari beban sensibel dan laten dari seluruh ruangan. Penelitian ini bertujuan untuk menentukan beban daya pendingin dari desain ruang kantor PKS di Kalimantan Barat serta membandingkan sisa daya yang tersedia. Perhitungan dilakukan dengan menggunakan metode Cooling Load Temperature Difference (CLTD) berdasarkan standar dari American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). Mengacu pada hasil perhitungan didapatkan bahwa total beban sensibel lebih besar daripada beban laten dengan perbandingan 1: 3,18. Komponen yang membutuhkan beban pendingin maksimum adalah jendela kaca sebesar 12,96 kW. Ruangan yang membutuhkan daya beban pendinginan maksimum adalah lobi sebesar 8,66 kW. Beban pendinginan maksimum daya total adalah 51,5 kW pada jam 16.00. Beban daya pendingin dibandingkan dengan sisa daya yang tersedia dari PKS sebesar 184 kW. Daya untuk pendinginan ruang kerja adalah 4,5% dari total penggunaan daya di PKS. Pada kondisi ini pabrik masih dapat beroperasi dengan peningkatan faktor beban dari 86,4% menjadi 90,4%.
Effect of nano SiC addition on mechanical properties of Al-Nano SiC composite materials SS304 woven wire using stir casting method Alfi Hasan; Pieter Muhammad Iko Marrendra; Salahuddin Junus; Mahros Darsin
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.v21i4.3494

Abstract

The wide variety of applications in various industries, such as automotive, aerospace, construction, and electronics, aluminum is one of the metals that needs to improve its mechanical properties. This study aims to determine the effect of adding reinforcing powder using the stir casting method on the mechanical properties of the Al-nano SiC/SS304 Wire Woven Composite material. The method used in this study is an experiment with the addition of a matrix to the composite material. The addition of nano metal was carried out to modify the mechanical properties of the aluminum material. Variation of the composition of each specimen using the volume fraction of nano-SiC (1%, 3%, 5%) and 4% Mg and the addition of woven SS304 wire on the tensile strength and hardness tests. The highest tensile test results for the 5% volume fraction variation were 149 MPa and the hardness test was obtained at 69 HRB for the 5% volume fraction variation

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