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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 553 Documents
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Numerical Study On Characteristics Of The Backward-Facing Step Flow With Variations Of The Slope Angle Of The Step julian, james; Anggara, Rizki Aldi; Wahyuni, Fitri
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4052

Abstract

The phenomenon of flow separation plays a vital role in the industrial world. The backward-facing step (BFS) is a general form representing flow separation. This study investigates the influence of the slope angle of the step on BFS flow characteristics at various low Reynolds numbers. According to the CFD results, the flow separation phenomenon forms a circulation zone for each increase in Reynolds numbers. This phenomenon is a result of the sudden expansion of the channel geometry. The BFS with the slope angle of the step demonstrates that the increase in the recirculation zone can be minimized, thus appropriately delaying flow separation. The recirculation zone causes fluid flow to reverse direction, affecting fluid flow efficiency due to resulting pressure differences. Therefore, a BFS with the slope angle of the step exhibits a more efficient flow phenomenon by minimizing the recirculation zone.
Seleksi minyak pelumas yang tepat dicampur dengan oil treatment pada motor bensin 1290 cc Samsani Samsani; Mawardi Mawardi
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.v2i1.1408

Abstract

The Effect of Current Density on Mechanical Properties of Electroplated Thin Copper Foil Luthfi Luthfi; Yuniati Yuniati; Darmein Darmein; Sumardi Sumardi
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.v21i1.3456

Abstract

Thin copper foils are commonly used in arts, crafts, and manufacturing industries. Although copper electroplating processes have been widely studied, most focused on either copper in bulk material form factor or copper in extremely thin film shape. Thin copper foils are considered neither bulk material nor thin film; thus, it is estimated that they will have unique properties. This study aims to investigate the mechanical properties of thin copper foils coated by electroplating processes. The investigations were conducted experimentally by performing electroplating at current densities of 2, 3, and 4 A/dm2. The copper foil specimen having a dimension of 10 mm wide, 0.2 mm thick, and 125 mm long were electroplated in a bath of copper sulfate, sulfate acid, chloride acid, and copper brightener mixtures for 60 minutes powered by a 30 A DC power supply. The hardness and tensile test diagrams were studied. The strain, yield stress, and ultimate tensile stress data extracted from the tensile test diagram were compared with other previous studies found in the literature and fitted with linear regression lines. The relationship of those parameters with current density has been successfully obtained. The hardness, strain, and yield stress of the electroplated copper foil increased with larger current densities used in the electroplating process except for the ultimate tensile stress, which was found to be slightly decreased with current densities. The optimum operating condition for obtaining the best results was found at a current density of 3 A/dm2.
Physical property analysis of biodiesel from nyamplung and used cooking oil: density, viscosity, calorific value, and flash point Wahyudi, Wahyudi; Nadjib, Muhammad; Faizi, Achmad
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.v22i2.4565

Abstract

The increasing dem and for energy and the depletion of fossil fuel shas led to the exploration of alternative fuels like biodiesel, which require sref inement tomatch diesel oil properties. This study investigates the combination of nyamplung oil, a non-edible potential source, with waste cooking oil for biodiesel production, aiming to improve its physical properties. Through a method ological approachin volving degumming, esterification, and transesterification, biodiesel was produce dfrom these oils in 11 different blend compositions. The physical properties of these blends, including density, viscosity, flashpoint, and calorific value, were rigorously tested. Results indicate that incorporating waste cooking oil into nyamplung biodiesel significantly reduces viscosity, density, and flashpoint while increasing the calorific value. Specifically, the addition of waste cooking oil altered the density from 912.74 kg/m³ in pure nyamplung biodiesel to 857.27 kg/m³, decreased the viscosity from 28.02 cStto 4.58 cSt, reduced the flash point from 223°C to 197°C, and increased the heating value from 7,626.59 cal/g to 8,348.94 cal/g.
Kajian perlakuan serat sabut kelapa terhadap sifat mekanis komposit epoksi serat sabut kelapa Indra Mawardi; Azwar Azwar; Amir Rizal
Jurnal POLIMESIN Vol 15, No 1 (2017): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v15i1.369

Abstract

Komposit adalah gabungan dari dua atau lebih material berbeda yang terdiri dari fiber dan matriks, penelitian ini menggunakan serat (fiber) serat sabut kelapa, dan matrik yang digunakan yaitu Epoxy Resin dan Epoxy hardener dengan merk Eposchon,  dengan  perbandingan  30:70.  Tujuan dari penelitian ini adalah untuk mengetahui pengaruh perlakuan serat sabut kelapa terhadap sifat mekanik dan juga untuk mengetahui nilai beban kejut dan beban lentur komposit epoksi yang berpenguat serat sabut kelapa yang mengalami perlakuan.  Pada  penelitian  ini  peneliti  mengkaji kekuatan Impak dan Bending dari komposit serat sabut kelapa, dan pengaruh perendaman  serat  dalam  larutan  Alkali  (NaOH)  5%  selama  5  jam,  serta  blender dengan variasi waktu 10 menit, 20 menit, dan 30 menit. Standar pengujian Impak menggunakan   standar   ASTM   E   23,   sedangkan   untuk   pengujian   Bending menggunakan standar ASTM D 790. Berdasarkan hasil dari kesimpulan yang didapat dari pengujian material komposit yang mempunyai harga Impak tertinggi yaitu komposit dengan perlakuan blender 10 menit yaitu sebesar 0.02 J/mm. Sedangkan untuk pengujian Bending mempunyai kekuatan bending tertinggi yaitu komposit dengan perlakuan blender 30 menit yaitu sebesar 88.68 Mpa. Kata kunci : Komposit, serat sabut kelapa, resin epoxy, perlakuan mekanis, uji impak, uji bending
Analisa variasi gerakan elektroda pada hasil las bahan baja karbon rendah (ST37) terhadap sifat mekanik Bahdin Ahad Badia; Muhammad Halim Asiri Halim Asiri; Mardin Husen
Jurnal POLIMESIN Vol 19, No 1 (2021): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v19i1.1912

Abstract

Dewasa ini jenis pengelasan semakin banyak dengan adanya kemajuan teknologi, baik proses pengelasan yang menggunakan bahan tambah atau filler maupun yang tanpa menggunakan bahan tambah. Penelitian ini bertujuan untuk mengetahui kekuatan bending dan kekerasan pada sambungan hasil pengelasan dengan menggunakan variasi gerakan elektroda lurus, gerakan elektroda melingkar dan gerakan elektroda zigzag. Proses pengelasan mengunakan mesin las SMAW dengan arus pengelasan 95 A, kawat elektroda E6013 diameter 2,6 mm, sedangkan bahan yang digunakan adalah baja karbon rendah ST37 yang beri kampuh V sudut 60o. Hasil penelitian didapatkan bahwa pengujian bending sambungan las tertinggi terjadi pada gerakan elektroda lurus dengan niali pengujian kekuatan bending rata-rata tertinggi sebesar 1810.08 MPa, sedangkan nilai pengujian bending rata-rata terendah pada pengelasan gerakan elektroda zigzag sebesar 1159.07 MPa. Nilai kekersan Vickers HAZ rata-rata tertinggi terdapat pada pengelasan gerkan elektroda zigzag sebesar 180.63 HV1 sedangkan nilai kekersan Vickers HAZ terendah terdapat pada pengelasan gerakan elektroda melingkar sebesar 172.83 HV1.
Investigation of fuel properties and structural-functional group analysis in blending low and high boiling point fuels: the case of ethanol with fuel Annisa Bhikuning; Budi Setiawan; Jamal F. Jati; Jefa D. I. Wijaya; Muhammad Hafnan
Jurnal Polimesin Vol 21, No 3 (2023): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i3.2982

Abstract

For numerous decades, diesel fuel has served as the primary source of energy for diesel engines. For optimal performance, these engines are designed to withstand a high flammability threshold. Diesel fuel is therefore the preferable option for refueling military combat vehicles, particularly battle tanks. Concerns have been expressed regarding the use of diesel fuel due to its potential contribution to environmental pollution; emissions from combustion include NO2, NO, CO, SO2, and particulate matter. To reduce these emissions, diesel fuel must be blended with another substance. To reduce emissions, ethanol incorporation is a potential solution. A previous study demonstrated that combining fuels with high and low boiling points can enhance performance. Mixing ethanol, which has a low boiling point, with biodiesel/diesel fuel and fuel with a high boiling point can produce a superior fuel. Analyzing the characteristics of the fuels produced by merging ethanol with diesel fuel and biodiesel is crucial. This analysis aids in the comprehension of the fuel's physical properties prior to its use in a diesel engine. In this investigation, Indonesian diesel fuel and biodiesel standards are blended with ethanol at 10%, 25%, and 35% (volume) blending ratios. In addition to utilizing FTIR (Fourier Transform Infrared Spectroscopy) for analysis, the objective of this study is to determine the combustion properties of a blend of biodiesel, diesel fuel, and ethanol. Using the American Society of Testing Materials (ASTM) D method, fuel properties such as density, viscosity, cetane index, and distillations are analyzed. The results indicate that increasing the proportion of ethanol in diesel fuel and biodiesel reduces viscosity and density. By integrating ethanol, which has a lower density and viscosity than diesel fuel and biodiesel alone, the fuel properties can be improved. A perfect blend of ethanol, diesel fuel, and biodiesel can increase the quality of fuel, thereby enhancing diesel engine combustion.
Analisis ruang kerja dan gaya statis robot DD-1 Anwar Anwar
Jurnal POLIMESIN Vol 7, No 2 (2009): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v7i2.1294

Abstract

Robot DD-1 dirancang untuk pemindahan bahan-bahan kimia berbahaya di laboratorium. DD-1 dirancbng dengan menggunakan type SCARA (Selective Compliant Articulated Robot for Assembly). Robot ini dirancang dengan menggunakanbantuan beberapa software sehingga dapat diperoleh hasil desain dan perhitungan yang akurat. Hasil yang diperoleh dari hasil proses perancangan diperoleh nilai defleksi yang cukup kaku dengan nilai defleksi maksimum 0,0033407 mm tanpa beban 0,070555 mm dengan beban dalam arah z. Kata Kunci :    Link, Joint, Gaya, Momen,Inersia,Torsi, Defleksi,Batang Puntir
Analysis of Wind Energy Potential as A Hybrid Power Plant in Banda Aceh and Surrounding Areas Ratna Sary; Ahmad Syuhada; Teuku Zulfadli
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.v20i1.2298

Abstract

Wind is one of the energy sources developed as new and renewable energy in Aceh Province because of the sufficient wind potential available. In its utilization, wind speed is one of the important and main variables in calculating the amount of energy obtained. This energy will later be combined with energy sources from PLN which have been using fossil fuels. Wind potential in Banda Aceh and its surroundings is very possible to be converted into electrical energy because the average wind speed in Banda Aceh and its surroundings ranges from 4-6 m/s and can blow for approximately 4 to 6 hours per day. The results of the study of the potential of wind energy as a power plant in the Saree area (Aceh Besar District), then obtained an average wind speed in 2017 of 4.2 m/s by generating electrical power of 312 Watt/m2. In 2018 it was 4.6 m/s with an electric power of 341 Watt/m2. While in 2019 it was 5 m/s by generating an electric power of 368 Watt/m2 and the comparison in two other areas, namely Gampong Jawa and Gampong Deah Glumpang Banda Aceh, was obtained by Gampong Jawa with a wind speed of 4.35 m/s by producing 324 Watts/m2 and in Deah Glumpang Village with a wind speed of 3.95 m/s with a power output of 296 Watt/m2
Study of Improved Crack Toughness of Unsaturated Polymers with Rice Husk Fiber and Sago Flour as Strengthening Materials Nusyirwan, Nusyirwan; Hizhar, Yul; Malik, Adam
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.3375

Abstract

The development of environmentally friendly composites from natural fibers is an absolute thing to do to replace non-degradable synthetic composites. Some of the weaknesses of natural fiber composites are low mechanical strength, ease of cracking, no moisture resistance, and high-temperature resistance. One of the things that has been done is to make a combination of synthetic materials as a matrix derived from unsaturated polyester reinforced with natural fibers from crushed rice husk particles and starch from sago flour which is used to reduce the percentage of synthetic materials to be able to form composites that are easily decomposed. From the research, it was found that the strength of crack resistance could be increased with a mixture of polyester reinforced with rice husk fiber and sago flour, obtaining an increase in crack resistance strength until the addition of rice husk with a percentage of 15%. While increasing the RH content above 15%, the crack strength value decreases due to the saturation of the RH molecules in the UP which is no longer bound to the UP molecules. The highest crack strength values occurred for the addition of the percentage of RH and SS to the UP material with the addition of 5% SS, which obtained a cracking force of 550 N while the strength of pure polyester was only 37 N. This shows that RH and SS materials can bond with UP molecules and some molecules of RH and SS can prevent cross-linking of polyester molecules. Meanwhile, the addition of SS up to 10% decreases the fracture force obtained, indicating that not all of the sago starch can bind to the polyester molecules.

Page 22 of 56 | Total Record : 553

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