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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
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Prediction Modeling of Low Alloy Steel Based on Chemical Composition and Heat Treatment Using Artificial Neural Network Desmarita Leni
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.v21i5.3896

Abstract

The utilization of machine learning methods in modern material science enables the design of more efficient and innovative materials. This research aims to develop a machine learning model using the Artificial Neural Network (ANN) algorithm to predict the mechanical properties of low alloy steel. The dataset used consists of 15 input variables and 2 output variables, namely Yield Strength (YS) and Tensile Strength (TS). In this study, three ANN architectures were designed and their performance was compared using evaluation metrics such as Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and R-squared. During the search for the best parameters for the ANN model, variations were made in the optimizer, learning rate, and batch size. The evaluation was conducted using cross-validation technique with k=10. The evaluation results indicate that the model with the best performance in predicting YS had MAE of 18.197, RMSE of 23.552, and R-squared of 0.969. For predicting TS, the model achieved MAE of 27, RMSE of 36.696, and R-squared of 0.907. The research results demonstrate that the ANN model can be used to predict the mechanical properties of low alloy steel based on alloy chemical composition and heat treatment temperature with reasonably high accuracy
Pengendalian kualitas cacat scrap blown ban TBR 11R22.5 dengan metode QCC dan seven tools pada PT. Gajah Tunggal Tbk Taufik Taufik; Edi Supriyadi; Riki Effendi
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.v19i1.2008

Abstract

PT. Gajah Tunggal Tbk adalah sebuah perusahaan yang bergerak dibidang manufaktur dengan produk ban untuk berbagai kendaraan dan kegunaan. Dalam proses produksi terhadap produk yang dihasilkan, masih terdapat produk cacat (khususnya cacat scrap blown) yang terjadi setiap hari dan bersifat fluktuatif, sehingga menyebabkan pengiriman produk kepada konsumen menjadi terlambat. Pada penelitian ini, penulis ingin mengatasi masalah tersebut dengan metode yang cocok untuk mengurangi cacat dan mengendalikan mutu produk adalah dengan menggunakan metode QCC (Quality Control Circle) dengan menerapkan langkah PDCA (Plan-Do-Check-Action) dan dengan alat bantu Seven Tools (Stratifikasi, Grafik Histogram, Diagram Pareto, Diagram Sebab-Akibat, Grafik Pengendali). Setelah dilakukan perbaikan dengan metode tersebut, hasilnya terbukti menurunkan rata-rata persentase cacat scrap blown dari 0.54% menjadi 0.16% dan menurunkan rata-rata persentase total cacat scrap dari 3.29% menjadi 1.70%. Untuk megurangi cacat scrap blown dibuatlah SOP baru sebagai acuan saat proses produksi dan tindakan lainnya untuk mengurangi cacat scrap produksi guna mencapai target scrap 1%. Jadi, faktor yang menyebabkan cacat scrap blown adalah material kurang atau tidak lengket dan hasil implementasi dengan metode QCC dibantu dengan alat bantu seven tools dapat mengurangi atau menurunkan cacat scrap blown dan persentase total cacat scrap.
Identifikasi permukaan aluminium dengan image processing dan artificial neural network Irwin Syahri
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.v8i1.1332

Abstract

Penelitian ini bertujuan untuk mengidentifikasi permukaan suatu logam, khususnya Aluminium berdasarkan image processing yang ditampilkan logam dengan pendekatan komputasi menggunakan Artificial Neural Network (ANN). Specimen dikerjakan dengan menggunakan beberapa mesin dan tingkat kecepatan putaran spindle dan kecepatan pemotongan yang berbeda sehingga didapatkan kekasaran permukaan yang berbeda. Specimen diambil image-nya menggunakan kamera digital 4 mega piksel dengan sumber pencahayaan, jarak dan jumlah pixel image yang sama. Image Alumunium selanjutnya di proses untuk dapat dikenali dengan ANN. Hasil penelitian menunjukkan model ANN 11 input 5S hidden dan 1 output: (11-5-1) menunjukkan hasil terbaik untukmengidentifikasi bentuk permukaan Alumunium dengan RMSE yang terkecil: 0.0038 untuk training dan testing.Kata kunci : Roughness surface, Image Processing, ANN
Exhaust Emission Control in Sport Motorcycles: A Comparison of Catalytic Converters with Alternative Metal Materials Warju Warju; Sudirman Rizki Ariyanto; Muhammad Yandi Pratama
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.v22i1.4092

Abstract

In this modern era, motor vehicles have brought significant changes in human life. Faster and more efficient mobility has increased connectivity between regions, supported economic growth, and improved quality of life. However, increased mobility also means an increase in vehicle exhaust emissions, which contribute to climate change and air pollution. One effective technology for controlling exhaust emissions is the use of catalytic converters. Metal catalytic converters, such as copper, brass, and chrome-plated copper, have been researched as more affordable and effective catalyst alternatives. This research aims to analyze the optimal design of exhaust systems with catalytic converters among three types of alternative materials (copper, brass, and chrome-plated copper) as well as standard exhaust systems without catalysts (STD NC) and standard platinum group metal exhaust systems (STD PGM) in maximizing the reduction of motor vehicle exhaust emissions. An experimental research design was used by utilizing a 2015 Yamaha Vixion Lightning as the research object. Catalytic converters were prepared with specific specifications to ensure consistency and accuracy in measurements. CO (carbon monoxide), HC (hydrocarbons), CO2 (carbon dioxide), and O2 (oxygen) emissions were analyzed using an Exhaust Gas Analyzer. The research results indicate that the CuCr sample exhibits excellent performance in reducing CO and HC emissions. The CuCr sample has an average CO emission of 4.09% Vol with a standard deviation of 1.46, demonstrating good consistency in CO emissions. Meanwhile, the average HC emissions from the CuCr sample are 320 ppmVol with a standard deviation of 106, indicating good consistency in HC emissions. All samples meet the emission standards set by the government, except for the STD NC sample, which exceeds the CO emission threshold.
The influence of height on the spreading distance of axisymmetric jets impinging on a rigid surface Luthfi Luthfi
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.v20i1.2437

Abstract

The influence of the domain height of negative buoyancy jets when impinging on a rigid surface has been investigated. The study was conducted numerically by applying the Computational Fluid Dynamics (CFD) method.  The numerical model consists of a set of Navier-Stokes equations together with an energy equation. The jet flow was modeled in a two-dimensional axisymmetric coordinate. The governing equations were solved in transient using the finite volume approach. The programming code for the numerical model was written in Fortran. The numerical simulations were run at Froude number Fr = 5.0; Reynolds number, Re = 200 and Prandtl number Pr = 7.0. The investigated parameter, the domain height was varied at around 8.8 ≤ H/X0 ≤ 10.2. The flow visualization created from simulation results has revealed the mystery behind the complex flow behavior in detail. Starting from the initial flow when the jet entered the domain to the complex flow pattern of the jet flow detaching from the top surface. Including when the downflow mixes with the upflow creating a recirculation area near the top surface and the bottom of the domain. The plot of the spreading distance over time shows that there is a maximum distance when the jet starts detaching from the top surface. Gradually, the distance decreases until reaching a fixed final distance when the jet flow reaches quasi-steady. The influence of the domain height that was investigated shows different flow patterns at different heights. The plot of final distances over the domain height shows that there is a nonlinear relationship. The regression equation created from the numerical data shows good agreement and accuracy.
Optimalisasi sistem pergudangan pada industri air minum dalam kemasan (studi kasus pergudangan pt. ima montaz sejahtera). Ramli Usman; Achmad As'ad Sonief; Bambang Indrayadi
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.v8i2.1368

Abstract

PT. Ima Montaz Sejahtera merupakan suatu Perusahaan Industri Air Minum Dalam Kemasan (AMDK) dengan merk “Mount Agua” dan perusahaan ini menghasilkan produk berupa produk gallon 19 liter, produk botol 1500 ml, produk botol 600 ml, dan produk gelas 240 ml. Pabrik PT. Ima Montaz Sejahtera memiliki dua buah gudang yaitu gudang material dan gudang produk jadi, didalam pengoperasian proses produksi banyak waktu yang terbuang untuk mengangkut material dari gudang ke mesin produksi dan ini disebabkan letak gudang material jauh dari mesin produksi dan juga dalam mengangkut material dari gudang ke mesin produksi harus melalui gudang produk jadi sehingga mengganggu aktifitas proses produksi. Metode yang digunakan pada penelitian ini menggunakan metode center of gravity yaitu menentukan titik pusat letak gudang baru berdasarkan tata letak mesin-mesin produksi.Dengan meningkatnya waktu produksi maka dengan sendirinya kapasitas produksi juga meningkat untuk produk gallon 19 liter sebesar 36 gallon per minggu (0,490 %), produk botol 1500 ml sebesar 211 karton per minggu (2,475 %), produk botol 600 ml sebesar 71 karton per minggu (1,172 %), dan produk gelas 240 ml sebesar 186 karton per minggu(0,731 %).Kata Kunci: Optimalisasi, Tata Letak Gudang, Centre of Gravity, Lay Out.
Study of hydrodynamic characteristics in oscillating wave surge converter james julian; Rizki Aldi Anggara; Ridwan Daris Naufal; Rifqi Ramadhani; Eko Andi Prasetyo; Fitri Wahyuni; Nabilah Dwi Gunasti
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.v22i2.4715

Abstract

In the realm of renewable energy, researchers worldwide have been paying close attention to developing the Oscillating Wave Surge Converter (OWSC) device. This device has the potential to harness the power of ocean waves and convert it into a reliable source of clean energy. Hydrodynamic characteristics are essential parameters in developing OWSC devices. Therefore, this research conducted a hydrodynamic study on the OWSC device with variations in ocean wave periods, including T= 1.5, 1.7, 1.9, 2.1, and 2.3. The Boundary Element Method (BEM) describes the interaction between sea waves and floating body structures. This method assumes incompressible, inviscid, and irrotational flow. A numerical approach is used as a calculation method followed by verification and validation to support the level of actualization. The research results showed that the incident wave caused the OWSC device to experience a deviation from its equilibrium position in the form of an oscillating flap inclination angle as a form of hydrodynamic characteristics. The sea wave period correlatedwith the rate of change in flap position over time, including the maximum deviation in the flap angle. As a power plant, the performance of the OWSC device can work at reasonably short-wave period intervals based on the device's ability to produce mechanical power. The highest average mechanical power was achieved in the T= 1.5 period of 34.49 Watts with an efficiency of up to 52.43%. The OWSC device requires a high intensity of wave energy in a short duration to generate optimal mechanical power. It is important to note that optimal mechanical power generation is crucial for the OWSC device to function effectively. Therefore, the device should be placed in a location where the wave energy intensity is consistently high.
Design and stress analysis of adjustable chair on handcycle for persons with disabilities Andika Wisnujati
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.v20i2.3013

Abstract

Handcycle is one of bicycle that used by someone with physical limitations, and this bicycle is operated by hand.  Some people who have physical limitations will not be able to ride a bicycle in general, so a handcycle is made using three wheels to be able to maintain the balance of the rider's body. This handcycle is a solution for people with disabilities to be able to go somewhere and also exercise. In this study, an adjustable chair design was made that is suitable for handcycles and has an adjustable function, namely making the handcycle seat move forward or backward to make it easier for a rider to adjust the position of the legs in moving the handcycle. The material used to manufacture the adjustable chair on the handcycle is iron plate, which is an elbow-shaped iron plate with an angle of 90o. The length is 300 mm, width 200 mm and thickness 50 mm. After the design is made, then a stress analysis test with Autodesk Inventor 2016 is carried out on the adjustable chair on the handcycle by analyzing the strength of the chair and also the appropriate body posture when supporting the weight of a person with a disability. The final result of the adjustable chair applied to the handcycle was measured by stress analysis using Autodesk Inventor 2016 software. The material strength (Von Misess) for male users who weighs 70 kg has a maximum value of 1.767 MPa with a maximum displacement of 0.0059. As for female users weighing 60 kg, the maximum value is 1.514 MPa with a maximum displacement of 0.050.
Development of CFD simulation model of earth air heat exchanger for space cooling of a 36 M2 house in tropical climate Banda Aceh, Indonesia Sarwo Edhy Sofyan; Khairil Khairil; Zhafran Maulana; Akram Tamlicha; Jalaluddin Jalaluddin; M. Syaukani
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.v21i2.3692

Abstract

The global warming makes the ambient temperature hotter and greater efforts are made to reach a comfortable temperature. The continuous use of air conditioners that consume electricity is also unsustainable for the surrounding environment. Several studies on thermal comfort have been conducted by various researchers. Earth-air heat exchangers (EAHE) with air-working fluids can be used as a passive contribution to reduce building energy requirements for heating or cooling purposes. It should be noted that there is very little information in the literature on the development of a CFD (Computational Fluid Dynamic) simulation model of an EAHE for space cooling of a 36 m2 house in a tropical climate, such as Banda Aceh, Indonesia. Therefore, this study aims to examine the performance of EAHE with several variations in design parameters, such as pipe length, pipe diameter, number of pipe bends, and the type of soil where the EAHE is installed, as well as the thermal regime of a 36 m2 house either with or without the use of EAHE. The simulation in this study was conducted with CFD ANSYS Fluent software. The inlet air temperature of EAHE was set to be the same as the ambient air temperature, namely 31.4oC. The simulation results reveal that for variations in pipe length, the highest drop in outlet air temperature was yielded by the 47 m pipe length, which is 26.8°C. In which an increase in pipe length causes a decrease in air outlet temperature. The variation in pipe diameter does not significantly affect the outlet air temperature. Where the average air temperature drop at the EAHE exit is 0.046oC. The variation in number of turns shows that the drop in outlet air temperature is identical, namely 28.2°C, despite the fact that their pressure drop values are different. In addition, it was found that the performance of EAHE buried under different types of soil is distinct. The highest drop in outlet air temperature was generated when the EAHE was buried in silty soil, namely 26.1°C. A case study on a 36 m2 house shows that the utilization an underground heat exchanger can reduce the house’s indoor temperature by 2°C, with an average house temperature of 30.4°C compared to that with a natural ventilation.
Penetuan persamaan faktor gesekan baru dengan menggunakan metode regresi multi variable bertolak ukur pada persamaan faktor gesekan chen Jenne Syarif
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.v2i1.1405

Abstract

Faktor gesekan F merupakan salah satu variable yang menentukan besarnya penurunan tekanan pada aliran fluida dalam pipa. Untuk aliran gas dalam pipa korelasi yang sering digunakan di lapangan adalah persamaan Weymouth untuk diameter pipa kecil dan panhandable.B untuk pipa diameter besar. Korelasi yang dapat digunakan pada selang ukuran pipa yang lebih besar adalah persamaan Chen memerlukan banyak input variable yang tidak mudah di jumpai dilapangan.

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