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INDONESIA
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
Mechanical Engineering - Energy Conversion Engineering - Material Engineering - Manufacturing Technology - Mechatronics - Machine and Mechanism Design - Biomechanics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 478 Documents
 1   2   3   4   5 
Perancangan turbin uap untuk siklus gabungan Jenne Syarief
Jurnal POLIMESIN Vol 7, No 1 (2009): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v7i1.1343

Abstract

Turbin gas beroperasi pada temperatur yang tinggi, sekitar 1100 — 1650”C. Temperatur gas-gas hasil pembakaran pada turbin gas biasanya masih cukup tinggi, sehingga masih mengandung energi yang cukup besar. Energi ini masih bisa dimanfaatkan untuk meningkatkan efisiensi siklus turbin gas sekaligus meningkatkan daya yang dihasilkannya. Salah satu cara untuk memanfaatkan energi ini adalah dengan menggunakan siklus turbin uap. Siklus turbin gas yang dilanjutkan dengan siklus turbin uap disebut sebagai siklus gabungan (Combined Cycle)Pada siklus turbin uap, energi gas-gas hasil pembakaran dimanfaatkan untuk memanaskan uap pada suatu Heat Recovery Boiler. Uap dari Boiler digunakan untuk menggerakkan turbin uap yang selanjutnya akan menjalankan generator. Uap yang dapat dihasilkan oleh Heat Recovery Boiler biasanya memiliki laju aliran massa yang cukup kecil, sehingga daya yang dapat dibangkitkan oleh turbin uap juga akan relatif kecil.Kata kunci: Turbin Uap, Combined Cycle, Siklus Gabungan
Computational Analysis Of Pipe Bend Angle Effect On Pressure Drop Muhammad Khoirul Akbar; Anis Roihatin; Nur Fatowil Aulia
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.v22i1.4229

Abstract

The air conditioning system is a significant energy source inskyscrapersfor supplying cool air to all rooms. However, the process has energy losses due to the ducting used. If the problem of energy loss can be solved, the air conditioning system will bring advantages in terms of energy efficiency and financial savings. A pressure drop in air duct pipe installations, such as pipe bends, is one type of energy loss. This research intends to use Computational Fluid Dynamics (CFD) to investigate the effect of pipe bend angles and velocity relationships on pressure drop in air duct pipe installations, which has previously been validated by experimental research with a 0.17% error percentage. This study focuses on square pipe bends with varying 45o, 60o, and 90o bend angles. The research showed that when testing the highest fluid velocity of 19.68 m/s, the highest pressure drop was 275.69 Pa on the pipe bend angle of 90o, while the lowest pressure drop was 256.41 Pa on the pipe bend angle of 45o. When testing the lowest fluid velocity of 9.77 m/s the highest pressure drop was 67.73 Pa on the pipe bending angle of 90owhile the lowest pressure drop was 62.98 Pa on thepipe bending angle of 45o. The simulation results indicate that the larger pipe bend angle result in a higherpressure drop, and vice versa.
Mechanical properties analysison FSW butt joint of aluminum alloy that applied in marine industries Rahadian Nopriantoko
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.v20i2.3062

Abstract

 Friction Stir Welding (FSW) was promoted as a new welding method, cheap and eco-friendly welding with good quality joints. Aluminum Alloy is used widely in industries, including the marine industry. AA 5XXX and 6XXX series are materials used for shipping manufacture and offshore construction, because of their corrosive resistance and good strength properties after joining. Similar butt joint welding using the FSW method for a number of aluminum alloy series AA 5052, AA 5083, AA 6061, AA 6063. Welding samples were made using AWS standards and then given radiographic testing to determine the general condition of the welds. Then a tensile strength test was carried out using a ZwickRoell tensile testing machine and a hardness test using a microhardness Vickers Buehler with ASTM standards on the welding results to analyze the mechanical properties of the welded joint zone, as well as compare each result and get the ratio of the number of mechanical properties of the joint results the weld to the base material. After that, the results and discussion were obtained that the weld area showed different mechanical properties for each series of aluminum alloys. The value of the tensile strength, when compared to the tensile strength of the base metal, is around 60-75%, while the hardness value is around 75-80.6 HV for all the welded samples.  
Design Analysis of Hydraulic Lifter Spreader Assy LRT Using Finite Element Method Ampala Khoryanton; Gutomo Gutomo; Sugeng Irianto; Farikah Tono Putri; Ahmad  Hamim S
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.v21i1.3249

Abstract

Spreader Assy is an integral part of the Jabodebek LRT train delivery. This part serves as an elevating device for the carriage. The installation of the spreader assembly to the train body poses a hazard to operators and work instruments, is too lengthy, and does not adhere to the Standard Operating Procedure (SOP). This issue is due to the implementation of the spreader assembly, which is still supported by crowbars, wood, and an iron plate. This study's objective is to analyze the design of the hydraulic lifter for the operator's convenience and safety when installing the spreader assembly. Hydraulic jack, base plate, and lifting plate are the primary components of this instrument. Based on FEA analysis, the stress that occurs in the hydraulic lifter construction after receiving the spreader assy load of 225.18 kg is between 3,312,239 N/m2 and 6,624,476 N/m2, whereas the yield strength of the SS400 material is 250,000,000 N/m2 because the stress is greater than the yield strength of the material. Since the maximum value is still well below the material's yield stress, it can be concluded that the hydraulic lifter construction can safely support the burden of the spreader assembly
Hubungan rancangan dan resiko terhadap konsumen Mohd Arskadius Abdullah; Dailami Dailami
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/jop.v7i2.1387

Abstract

Perkembangan   ilmu  pengetahuan   dan  teknologi   (IPTEK)  yang   begitu pesat telah  memacu terciptanya berbagai jenis peralatan kerja maupun mesin. Penggunaan peralatan kerrja dlmaksudkan adalah untuk  me'mbantu   kemampuan,    dan    keterbatasan    manusia    dalam  melaksanakan  tugasnya yang  lebih cepat, banyak,  teliti dan lebih  baik.  mutunya dengan sedikit kesalahan serta risiko dan beban kerja yang relatif kecil.  Dari sudut rancangan, peralatan  dan mesin yang  ada di pasaran sangat memuaskan, tetapi belum memuaskan untuk pemakai,   karena kurang  memperhatikan   kemampuan  dan  keterbatasan    manusia  sebagai  pemakainya:  Kandisi demikian cenderung akan mempercepat  terjadinya  kelelahan   yang  berakibat kecelakaan maupun gangguan  kesehatan.   Sehubungan  dengan  hal tersebut,   dengan  ini  telah  dilakukan observasi terhadap    beberapa   produk..Hasilnya   menunjukkan    masih    banyak   produk    yang    kurang memperhatikan  keterbatasan  manusia  sebagai  operator  sehingga  sering  menimbulkan  risiko. Hasil  pengamatan  ini sebagai  masukan  bagi para perancang  agar  dalam  merancang  produk lebih memperhatikan   faktor  keamanan, nyaman untuk dipakai,  mampu mengurangi beban kerja guna meningkatkan  produktivitas  kerja dan kesejahteraan. Kata kunci: rancangan produk, manusia, risiko.
Visual place recognition for autonomous mobile robot navigation using LoFTR and MAGSAC++ Udink Aulia; Iskandar Hasanuddin; Muhammad Dirhamsyah; Nasaruddin Nasaruddin
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.v22i2.4992

Abstract

Autonomous mobile robots are defined as robotic entities capable of independent movement and intelligent decision-making, relying on their ability to perceive and analyze their surroundings, including objects in their environment. In Simultaneous Localization and Mapping (SLAM) systems, loop closure is often achieved through visual place recognition techniques, where the system compares the current visual input with previously observed scenes to identify matches. In computer vision applications, Speeded-Up Robust Features (SURF) and Scale-Invariant Feature Transform (SIFT) are popular feature extraction algorithms used for such as key point detection, matching, and image registration tasks. The choice of inlier threshold should be based on the specific characteristics of the application and the nature of the images being processed. It often requires experimentation and tuning to find the optimal balance between robustness and accuracy. It Utilizes the pre-trained Local Feature Transformer (LoFTR) and MAGSAC++ estimator to address these drawbacks by employing the number of inliers to determine the similarity between two images for visual place recognition. Our experiment demonstrates that the number of inliers can determine the similarity of locations between two images. Scale variations and translation in location significantly influence the resulting number of inliers. Comparing images from the same location and from different locations yields varying numbers of inliers. The number of inliers significantly influences the similarity of locations. At the same location, the number of inliers is above 150, while at different locations, the number is below 150.
Desain mesin pertanian serbaguna berdasarkan model mesin perontok padi konvensional A. Jannifar; Mawardi -
Jurnal POLIMESIN Vol 14, No 1 (2016): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v14i1.291

Abstract

Kelompok masyarakat yang pendapatannya sangat tergantung kepada hasil pertanian masih cukup banyak, banyak petani yang hidupnya hanya didukung oleh penjualan berbagai hasil pertanian, dengan menanam berbagai jenis tumbuhan mereka tidak bergantung lagi satu jenis tumbuhan pada satu musim panen. Petani memerlukan mesin pengolah hasil pertanian yang dapat dipergunakan untuk mengolah berbagai ragam hasil panen, seperti padi, jagung dan kacang kedelai. Penelitian ini menghasilkan kombinasi optimal dimensi bagian silinder perontok untuk hasil panen yang berbeda. Tiga jenis hasil panen, yaitu padi, jagung, dan kacang kedelai dijadikan objek pengujian. Sementara itu mesin perontok padi tipe TH-6 produksi lokal yang juga dapat digunakan untuk merontokkan hasil-hasil panen tersebut, tetapi dengan kapasitas  perontokan terbatas. Hipotesa bahwa  perubahan 3 variabel silinder perontok : jarak antara gigi pertama, sudut gigi dan tinggi gigi perlu dirubah menurut hasil panen yang berbeda. Mengawali penelitian ini, dipilihkan tiga level variasi pada masing-masing variabel untuk diuji. Variabel pertama, jarak gigi perontok konvensional 40 (mm) atau seri 4, dipilih level pengujian tambahan pada level 30 (mm) atau seri 3 dan 35 (mm) atau seri 3,5. variabel kedua, sudut gigi konvensional 45 (o) dipilih level pengujian tambahan 36 (o) dan 60 (o), Variabel ketiga, tinggi gigi konvensional 60 (mm) dipilih level pengujian tambahan pada 40 (mm) dan 50 (mm). Eksternal variabel yang dapat mempengaruhi penelitian ini adalah gaya pelepasan butir (N), kadar air (%) dan putaran silinder perontok (rpm). Ketiga eksternal variabel tersebut dikendalikan pada kondisi pemakaian mesin perontok biasanya. Kondisi pemakaian yang biasa dinilai oleh operator mesin yang berpengalaman. Dari hasil pengujian pada level yang dipilih, diperoleh susunan gigi perontok optimal untuk padi, seri gigi 4, sudut gigi 36 (o) dan tinggi 60 (mm). Untuk jagung, seri gigi 3, sudut gigi 36 (o) dan tinggi gigi 60 (mm). Untuk kacang kedelai, seri gigi 4, sudut gigi 45 (o) dan tinggi gigi 50 (mm). masing-masing susunan menghasilkan kapasitas perontokan untuk padi 1920 (kg/jam), jagung 2450 (kg/jam), kacang kedelai 459 (kg/jam). Dibandingkan dengan kapasitas perontokan  mesin perontok konvensional, untuk padi mengalami kenaikan 92 % ,  jagung 22 %,  kacang kedelai 15 %.
Effect of cooling media on hardness and microstructural changes in S45C carbon steel during heat treatment process Bambang Hari Priyambodo; Reni Laili; Rizqi Ilmal Yaqin; Suhartoyo Suhartoyo
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.v21i3.3846

Abstract

S45C Carbon steel is commonly used in the manufacturing of structural or machine components due to its numerous advantages. However, to fulfill its intended purpose, the mechanical properties of this material require improvement. One approach to achieve this is through heat treatment using different cooling fluids. Therefore, this study aimed to examine the effect of varying cooling fluids on heat treatment of S45C carbon steel, specifically its hardness and microstructure changes. The experimental method employed involves heating the specimens in a furnace at 850oC for 30 minutes, followed by cooling using different fluids, namely water, ice water, and oil. The results showed that faster cooling led to an increase in hardness. In particular, the specimens cooled using water, ice, and oil yielded hardness values of 697 HV, 481 HV, and 248 HV, respectively. The highest hardness value of 697 HV was achieved using ice water, indicating an increase of around 281%. The phase changes observed on the surface of the specimen showed the dominance of martensite.
Analisa pengaruh variasi kampuh terhadap hasil pengelasan SMAW pada stainless steel 304 menggunakan pengujian ultrasonic dan kekuatan tarik arif rahman hakim; imran imran
Jurnal POLIMESIN Vol 18, No 1 (2020): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v18i1.1057

Abstract

Kekuatan hasil sambungan las dipengaruhi oleh berbagai faktor yang sangat beragam. Salah satunya karena perubahan struktur akibat dari proses pemanasan. Agar sambungan antara dua bagian logam memiliki mutu yang baik diperlukan suatu pengelasan yang tepat dan sambungan serta bentuk kampuh las yang sesuai dengan kegunaan dari hasil lasan tersebut. Parameter pada pengelasan SMAW meliputi kuat arus, tegangan listrik, polaritas listrik, dan sudut kampuh yang digunakan. Parameter inilah yang menjadikan dasar pemilihan yang tepat guna mendapatkan kualitas atau mutu sambungan yang baik. Tujuan penelitian ini untuk mengetahui pengaruh variasi kampuh terhadap uji ultrasonic dan uji kekuatan tarik hasil sambungan proses las Shielded Metal Arc Welding (SMAW) pada material stainless steel 304. Proses pengelasan dilakukan dengan menggunakan elektroda tipe NSN 312 AWS A5.4 E312-16 dengan menggunakan arus 100 A pada posisi pengelasan 1 G, pengelasan dilakukan pada material dengan menggunakan sudut kampuh V, I dan double V sebanyak 1 spesimen setiap kampuh. Hasil penelitian menunjukkan bahwa cacat pada hasil pengelasan dengan menggunakan sudut kampuh V lebih sedikit dibandingkan dengan pengelasan menggunakan sudut kampuh I dan double V. Selain itu, hasil pengujian tarik material stainless steel 304 menunjukkan nilai tegangan tertingi terjadi pada kampuh V yaitu sebesar 610,11 N/mm²  yang membuat material stainless steel 304 mengalami deformasi plastis. Hal tersebut membuktikan bahwa material stainless steel 304 yang dilas dengan mengunakan sudut kampuh V memiliki tegangan luluh lebih tinggi dibandingkan pengelasan dengan menggunakan sudut kampuh I dan double V. Kata Kunci : SMAW, ultrasonic Test, uji Tarik, elektroda, kampuh Effect of butt weld groove variations on stainless steel 304 by the SMAW welding using ultrasonic testing and tensile strength Abstract The strength of the weld joint is influenced by various factors that are very diverse, one of which is due to structural changes due to the heating process. In order for the connection between two metal parts to have good quality, precise welding is required and the connection and shape of the weld seam are in accordance with the use of the welded product. The parameters in SMAW welding include current strength, electric voltage, electric polarity, and groove used. These parameters make the basis for choosing the right one to get a good quality connection. The purpose of this study was to determine the effect of seam variations on the ultrasonic test and tensile strength test results of the Shielded Metal Arc Welding (SMAW) welding process on stainless steel 304 material. The welding process was carried out using NSN 312 AWS A5.4 E312-16 type electrodes using the current of 100 A at 1 G welding position, welding is carried out on the material using a groove V, I and double V for 1 specimen each seam. The results showed that the defects in the results of welding by using the angle of seam V is less than the welding using the angle of seam I and double V. In addition, the results of tensile testing of stainless steel material 304 showed the highest value of stress occurs in seam V that is equal to 610.11 N / mm² which makes stainless steel 304 material undergo plastic deformation. This proves that 304 stainless steel material welded using groove V has  higher yield stress than welding by using groove I and double V. 
Perbandingan sampah organik rumah tangga dengan sampah organik pasar terhadap kuantitas biogas Subur Mulyanto; Zulkifli Zulkifli; Elisabeth Milaningrum
Jurnal POLIMESIN Vol 16, No 2 (2018): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v16i2.563

Abstract

Abstrak Penelitian ini bertujuan untuk mengetahui bagaimana cara dan proses pembuatan biogas untuk mendapatkan hasil yaitu gas metana (CH4) secara maksimal dengan menggunakan bahan dari sampah organik makanan rumah tangga dan sampah organik pasar. Jenis penelitian ini adalah eksperimen, dimana penulis melakukan perencanaan, perancangan, pembuatan, dan pengujian secara langsung dilapangan untuk mengetahui hasil dari percobaan tersebut. Proses dalam penelitian menggunakan bahan baku sampah pasar dan sampah organik rumah tangga yang kemudian masing–masing difermentasi selama 12 hari, setelah  dilakukan pengambilan sampel untuk uji nyala dan uji kandungan gas metana yang dihasilkan. Hasil penelitian menunjukan bahwa sampah organik pasar lebih baik digunakan sebagai bahan untuk pembuatan biogas dibandingkan dengan sampah makanan rumah tangga dikarenakan sampah organik pasar tidak memerlukan waktu yang lama untuk terbakar, pada proses pengujian kandungan gas metana sampah organik pasar memiliki kandungan gas metana yang lebih tinggi yaitu 52,8 % dibandingkan dengan sampah organik rumah tangga yang hanya 0,29 %.Kata kunci:  Biogas, Gas metana (CH4), Sampah organik pasar, Sampah organik rumah tangga, fermentasiAbstract This study aims to find out how the way and process of biogas production to obtain the results of methane (CH4) to the maximum by using materials from organic household food waste and organic waste market. This type of research is experimental, where the authors do the planning, design, manufacture, and testing directly in the field to find out the results of the experiment. The process in this study includes the selection of materials divided into 2, namely market waste and household organic waste which then each fermented for 12 days, after sampling for the test flame and test the methane gas content produced. The results showed that the market organic waste is better used as a material for the manufacture of biogas compared with household food waste because the market organic waste does not require a long time to burn, in the process of testing the methane gas content of organic waste market has a higher methane gas content 52.8% compared with household organic waste which is only 0.29%.Keywords: Biogas, Methane (CH4), Organic waste market, Household organic waste, fermentation

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