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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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Inspeksi sambungan las pada pipa steam generator menggunakan metode radiography teknik panoramic (studi kasus di PT. Tachi Jino) Muhammad Zaky; Syukran Syukran; Azwar Azwar
Jurnal POLIMESIN Vol 15, No 2 (2017): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v15i2.374

Abstract

Inspeksi Sambungan Las Pada Pipa Steam Generator Menggunakan Metode Radiography Teknik Panoramic (Studi Kasus Di PT. Tachi Jino) dengan membuat perhitungan Exposure Time menggunakan Komputasi. Tulisan ini membahas tentang Penyinaran menggukan teknik Panoramic pada sambungan las pada pipa steam generator yang berukuran 10 inchi (Schedule Pipe-40) yang ada pada PT. Cladteck Bi Metal, Batu Ampar, Batam, Kepualauan Riau. Tujuan dari Inspeksi ini adalah, melakukan Penyinaran dengan teknik panoramic, membuat kalkulasi menggunakan Komputasi pada perhitungan Radiography. Pengoprasian ini di lakukan dengan kamera Radiography tipe Gamma Ammersham 661 Co-60 yang berkapasitas 150 Ci. Dari hasil yang sudah diperhitungkan, waktu penyinaran (Exposure Time) yang digunakan adalah perhitungan dengan menggunakan Komputasi yaitu 81 detik dengan nilai film error 0,88 % lebih sedikit dibandingkan dengan menggunakan rumus teknik (manual) yaitu 71 detik dengan nilai film error sebesar 11,4 %. Pada proses penyinaran Radiography Operator menggunakan perhitungan Komputasi, dari hasil penyinaran yang diketahui bahwa pada posisi 0-15 terdapat Porosity yang cukup signifikan sehingga perlu adanya repair atau pengelasan kembali dan dinyatakan reject oleh Interpreter. Sedangkan pada posisi 15-30 memiliki las-lasan yang cukup memenuhi syarat, sehingga dinyatakan clear oleh Interpreter dan pada posisi 30-0 terdapat Lack Of Fusion yang cukup signifikan sehingga perlu adanya repair atau pengelasan kembali dan dinyatakan reject oleh Interpreter. Pada akhirnya hasil dari film sangat berpengaruh pada waktu Exposure Time.Kata Kunci : Steam Generator, metode radiography teknik panoramic, kamera gamma ammersham   661 Co 60, exposure time, lack of Fusion
Pengaruh penggunaan blower pada kolektor surya sebagai alat alternatif untuk meningkatkan kualitas hasil pengeringan biji kopi di daerah Aceh Andi Mulkan; Teuku Zulfadli
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.v19i1.2023

Abstract

Naturally drying in the sun takes a very long time and product hygiene is also an obstacle because usually drying is done on open land. Using natural heat transfer, the time required for the coffee bean drying process ranges from 12-20 hours. The study describes a solar collector as an alternative device for drying in resulting coffee bean products with more hygienic without being exposed to dirt or bacteria. Shorter processes in which the quality of coffee beans increased were expected. The method used in this research is to analyze the heat absorption ability of the absorber using aluminium material which has been previously painted and the use of an air blower. The temperature inside was taken at thirty-minute intervals. Measurement of the mass of coffee beans was measured every 1-hour using digital scales. Similarly, mass and moisture content were also measured every 1 hour. From the results, it shows that the use of a blower with an airflow rate of 3.65 m/s with an average temperature of 56 ℃ can reduce the moisture content by 25.5%. For an air velocity of 4.55 m/s with an average temperature of 54.2 ℃, the moisture content reduces as much as 24.52%. Furthermore, for an airflow rate of 4.95 m/s with an average temperature of 52.7 ℃, the moisture decreased by 21.78% within 4 hours
Experimental and discrete event simulation (DES) modeling analysis of the belt conveyor conveying capacity Muas Muchtar; Muhammad Arsyad Suyuti; Syaharuddin Rasyid; Andi Saidah
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.v21i3.3589

Abstract

Belt conveyors can continuously move the desired amount of material from one location to another. The conveying capacity of the conveyor must be met based on the previous design criteria. The belt conveyor must operate at the appropriate conveying speed and queue time interval. Higher or lower conveyor speeds and queue time intervals can cause a decrease in efficiency and productivity. The objectives of this study are 1) to determine the effect of the independent variables (observations), namely, the speed of the head pully conveyor and the time interval of the box queue, on the conveyor performance, 2) to obtain information on the normality profile and significance of the conveyor performance data. This research is oriented toward experimental and quantitative research designs. The independent variables observed are the speed of the head pully belt conveyor and the box queuing time interval on the dependent variable, namely the belt conveyor conveying capacity. The data collection technique is in the form of direct measurements on the conveyor system and the collection of output data from the previously designed DES modeling. Two types of analysis used are comparative quantitative analysis methods and statistical-based analysis. The results showed a significant influence between the independent variables of speed and box queue time interval on the conveying capacity of the belt conveyor. Another result is that the conveyor capacity data obtained from this study have a near-normal distribution and a high significance level.
Variasi temperatur melting polypropylene terhadap perubahan bentuk produk dengan menggunakan desain extrusi single screw Darmein Darmein
Jurnal POLIMESIN Vol 8, No 1 (2010): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v8i1.1331

Abstract

Perancangan alat ekstrusi yang dilakukan dalam penelitian ini merupakan langkah awal untuk menambahkan investasi peralatan uji dan pengetahuan tentang pengolahan plastik. Dari hasil design dan manufaktur telah berhasil dibangun satu unit mesin ekstrusi single screw dan telah di operasikan. Pada penelitian ini, perubahan bentuk dan ukuran dari produk akan dianalisis dengan menggunakan variasi temperatur proses memiju titik lebur dari polypropylene. Variabel bebas adalah :170°, 180°, 190°, 200°, dan 210℃, dan kecepatan putaran screw 60 rpm digunakan sebagai tempratur proses . Produk dibuat dalam bentuk barrel dengan ukuran dies 5 mm . Hasil penelitian ini telah dibuat sebuah mesin ekstrusi tipe single screw. Dengan menggunakan bentuk dan eksirusi sebagai indikator keberhasilan, maka tempratur proses yang sesuai untuk mesin ini pada perbandingan L / D - 14 untuk 11P sampai ke 180℃Kata kunci: Plastik, Polypropylene, eksiruksi, Titik lebur
An Uncertainty Analysis of Temperature Distribution on Loop Heat Pipe Prototype Nursinta Adi Wahanani; Mukhsinun Hadi Kusuma; Giarno Giarno; Afifa Pramesywari; Dedy Haryanto; Yoyok Dwi Setyo Pambudi
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.v20i2.2495

Abstract

To improve safety and normal operation aspects to be more economical, the NuScale type power reactor has the potential to be added passive cooling system technology. The technology is a loop heat pipe (LHP) with a wick made of a collection of capillary tubes. To determine the thermal performance of the LHP technology properly, the supporting analysis was needed before the experiment is carried out. One of the necessary supporting factors were to know the accuracy of measuring the temperature distribution on the LHP. The objective of this study was to determine the value of the uncertainty of the thermocouple used in the LHP experiment. By knowing the accuracy of the measurement of the temperature distribution, it is hoped that the resulting data is good and accurate. Data measurement was carried out using the National Instruments data acquisition system. The temperature distribution data retrieval was carried out under the condition that the LHP was in a steady state at the temperature of the hot water as the source of the LHP temperature of 35˚C, 45˚C, 55˚C, and 65˚C. Data collection was carried out within approximately 10 hours of the LHP experiment. The recorded temperature distribution data is then compared with temperature data using a well calibrated derived standard thermocouple. The calculation of the uncertainty value is carried out by statistical methods commonly used to determine the uncertainty of the temperature distribution measurement. The measurement results show that the average temperature value obtained is within the range of the standard uncertainty values of the thermocouple used. The uncertainty value obtained at all measurement points on variations in hot water temperature have value below the standard uncertainty value of the derived standard thermocouple used, which is 0.1°C. Based on these results, it can be concluded that the thermocouple used in the LHP experiment is feasible and has very good accuracy so that it can produce accurate and good LHP temperature distribution data.
Effect of numerous plate holes in a cooling tower on heat transfer optimization Suansyah, Heli; Syuhada, Ahmad; Sofyan, Sarwo Edhy
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.v21i5.4069

Abstract

An industry requires a cooling medium to reduce heat in an industrial machine during operation. Companies generally use cooling towers for engine cooling media. The common issue is that heat reduction and heat transfer rate are not significant. Therefore, a new variation is needed to ensure that the cooling tower can effectively lower the temperature of the machinery. The problem statement aims to determine the parameters that can enhance both the heat transfer rate and the heat transfer coefficient in cooling towers. The objective is to determine the heat transfer rate and heat transfer coefficient. The method used is experimental by varying the water inlet in five variations of the cooling tower plates, they are being 48, 60, 80, 120, and 250 holes. The results showed that the highest temperature difference occurs at Tin 80oC with the variation of 250 holes, which is 9.34oC, and the highest heat transfer value reached 1833.17 watts. Meanwhile, the lowest temperature difference occurred at Tin 60oC with a variation of 48 holes, which is 3,98oC, and the lowest heat transfer value reached 787.47 watts. The highest convection coefficient occurs at Tin 70oC with the variation of 250 holes, which is 117.74 W/m²⋅K. The lowest convection coefficient occurs at Tin 80oC with a variation of 48 holes, which is 77.36 W/m²⋅K. This can be concluded that the temperature difference (⧍T), heat transfer rate, and heat transfer coefficient will increase when the number of holes in each plate variation increases.
Peranan hutan kota dalam peningkatan kualitas lingkungan hidup Nurlaili Nurlaili
Jurnal POLIMESIN Vol 8, No 2 (2010): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jop.v8i2.1367

Abstract

Pembangunan kota sering lebih banyak dicerminkan oleh adanya perkembangan fisik kota yang lebih banyak ditentukan oleh sarana dan prasarana yang ada. Permasalahan lingkungan diperkotaan seakan tidak ada habisnya bahkan kian bertambah dari tahun ke tahun. Kota-kota besar di negara maju telah mengantisipasi permasalahan lingkungan sejak dini, antara lain dengan membangun ruang terbuka hijau berupa tanaman atau green park yang luasnya bisa mencapai puluhan hektar satu lokasi. Gejala pembangunan kota pada masa yang lalu mempunyai kecendrungan untuk meminimalkan Ruang Terbuka Hijau(RTH) dan juga menghilangkan keindahan alam. Lahan-lahan bertumbuhan banyak dialih fungsikan menjadi pertokoan,pemukiman,tempat rekreasi, industri dan lain-lain. Dengan meningkatnya pembangunan berbagai kegiatan seperti pembangunan jalan, kegiatan transportasi, industri, pemukiman dan kegiatan lainnya sering mengakibatkan luasan ruang terbuka hijau menurun dan sering juga disertai dengan menurunnya mutu lingkungan hidup. Hal ini akan mengakibatkan kota menjadi sakit, tercemar dan kotor. Walaupun ruang terbuka hijau pada kota-kota di Indonesia masih sangat terbatas, tidak berarti peluang memperbaiki ekosistem diperkotaan sudah tertutup. Masih banyak cara memperbaiki permasalahan lingkungan diperkotaan antara lain dengan menanam pohon disetiap sudut kota pada areal yang sempit sekalipun. Pada tulisan ini disajikan hal-hal penting terkait dengan peranan hutan kota dalam meningkatkan kualitas lingkungan hidup.Kata Kunci: Hutan Kota, Permasalahan Lingkungan,Manfaat PohonPembangunan kota sering lebih banyak dicerminkan oleh adanya perkembangan fisik kota yang lebih banyak ditentukan oleh sarana dan prasarana yang ada. Permasalahan lingkungan diperkotaan seakan tidak ada habisnya bahkan kian bertambah dari tahun ke tahun. Kota-kota besar di negara maju telah mengantisipasi permasalahan lingkungan sejak dini, antara lain dengan membangun ruang terbuka hijau berupa tanaman atau green park yang luasnya bisa mencapai puluhan hektar satu lokasi. Gejala pembangunan kota pada masa yang lalu mempunyai kecendrungan untuk meminimalkan Ruang Terbuka Hijau(RTH) dan juga menghilangkan keindahan alam. Lahan-lahan bertumbuhan banyak dialih fungsikan menjadi pertokoan,pemukiman,tempat rekreasi, industri dan lain-lain. Dengan meningkatnya pembangunan berbagai kegiatan seperti pembangunan jalan, kegiatan transportasi, industri, pemukiman dan kegiatan lainnya sering mengakibatkan luasan ruang terbuka hijau menurun dan sering juga disertai dengan menurunnya mutu lingkungan hidup. Hal ini akan mengakibatkan kota menjadi sakit, tercemar dan kotor. Walaupun ruang terbuka hijau pada kota-kota di Indonesia masih sangat terbatas, tidak berarti peluang memperbaiki ekosistem diperkotaan sudah tertutup. Masih banyak cara memperbaiki permasalahan lingkungan diperkotaan antara lain dengan menanam pohon disetiap sudut kota pada areal yang sempit sekalipun. Pada tulisan ini disajikan hal-hal penting terkait dengan peranan hutan kota dalam meningkatkan kualitas lingkungan hidup.Kata Kunci: Hutan Kota, Permasalahan Lingkungan,Manfaat Pohon
Analysis of the impact strength on laminated polyester composites reinforced sugar palm fiber (SPF) with fiber orientation: random and woven Fatkhurrohman Fatkhurrohman; Machmudi Machmudi
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.v20i2.2997

Abstract

Recently, composite materials have attracted the attention of researchers because of their advantages. The utilization of composite materials is widely used in various industrial fields, including in the automotive industry which is used as a car bumper. A car bumper composite material must be resistant to shock loads and good in energy absorption. Due to this, the composite material will be subjected to an impact test. This study aims to analyze the effect of variations in fiber volume fraction on the impact strength of laminated composites with a polyester matrix with sugar palm fiber (SPF) reinforcement with fiber orientation direction: random and woven. Composite fabrication was carried out using the hand layup and press molding methods with variations in fiber volume fractions of 20%, 30%, 40%, 50%, and 60%. Then the Charpy impact test was carried out with ASTM D-6110 standard and analyzed the fracture morphology. The test results show that increasing the fiber volume fraction up to 40% can increase the impact strength. However, the impact strength decreased at 50% and 60% fiber volume fraction. The results of the largest impact test were obtained at the 40% fiber volume fraction of 0.62 J/mm2 while the lowest value at the 20% fiber volume fraction was 0.42 J/mm2. The increase in the impact test value can be due to the uniform distribution of the load by the matrix to the fiber. Based on the morphological analysis carried out through macro photos of the shape of the fracture and the cross-section of the fracture, the results of the impact test showed that fibrous fractures occurred while on the cross-section of the fracture delamination and fiber pullout appeared.
Performance Air conditioner on retrofitted refrigerant hydrocarbon Pujianto, Muhammad Edi; Nugroho, Agung
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.v22i1.3584

Abstract

Synthetic refrigerants used in air conditioner (AC) are very important in depleting the ozone layer and prohibiting global warming. This has led to the application of R32 and Musicool 22 (MC22) as a substitute for R22 because refrigerant is considered more environmentally friendly. Therefore, this research aimed to compare the performance of applying both R32 and MC22 refrigerants in 1 PK split AC using the coefficient of performance (COP) as the indicator for AC performance and compressor power consumption. MC22 filling mass was varied at 90% (202.14 grams), 100% (224.6 grams), and 110% (247.6 grams) of R32 mass, and condenser inlet temperatures at 28°C, 30°C, 32°C, and 34°C. The results showed that MC22 could be used as a viable alternative to R32 due to the higher refrigeration effect value of 332.36 kJ/kg recorded for refrigerant
Peningkatan kekerasan dan kekuatan baja ems pada daerah pengaruh panas dengan metode heat treatment Syamsuar Syamsuar
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.v2i1.1404

Abstract

Penelitian ini bertujuan meningkatkan kekerasan dan kekuatan baja EMS 45 pada daerah HAZ dengan metode Heat Treatment. Benda dibuat sesuai standar DIN 50125 dan dilakukan proses tempering pada temperatur 100°C, 250°C dan. 400°C dengan media pendingin masing masing  air. oli suhu kamar dan oli 50°C. Parameter pengukuran meliputi kekuatan tarik dan kekerasan brinell. Hasil penelitian menunjukkan bahwa variasi temperatur tempering dan media pendingin  mempunyai pengaruh yang berbeda terhadap kekuatan Tarik dan kekerasan Brinell. Disimpulkan bahwa proses tempering pada temperatur 400°C dengan pendinginan oli merupakan hasil yang terbaik.

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