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Politeknik Negeri Lhokseumawe Jl. Banda Aceh-Medan Km. 280,3, Buketrata, Mesjid Punteut, Blang Mangat, Kota Lhokseumawe, 24301 Aceh, Indonesia
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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 503 Documents
 5   6   7   8   9 
Design of Natural Convection Solar Dryer for Coffee Beans with Monitoring System Based on Internet of Things Nurdin Nurdin; Irwin Syahri Cebro; Azhar Azhar; Hendrawati Hendrawati
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.v20i1.2613

Abstract

The process of monitoring the drying of coffee beans so far is still done traditionally so that the effectiveness of the drying process is still low. The IoT-based drying monitoring process is expected to provide better effectiveness and time efficiency. This research designs and manufactures a solar dryer with natural convection heat transfer for coffee beans equipped with an Internet of Things-based monitoring system. The purpose of this study is to develop the performance of a solar dryer with natural convection with the addition of an IoT-based monitoring unit. The research begins with a technical plan for the main components of the dryer. Components whose shapes, dimensions, and materials have been planned will be outlined in the form of detailed technical drawings. Detailed technical drawings will be a guide in the dryer manufacturing process. The main components of the dryer are solar collectors, drying chambers, and an IoT-based monitoring system. The solar collector will function to capture heat from the sun which will flow naturally into the drying room. An IoT-based monitoring system will capture the temperature and humidity (DFRobot DHT22 sensor) in the solar collector, drying room, and the environment of the dryer. In addition, a Bh1750 sensor to capture the intensity of the sun is also embedded in this monitoring system. This monitoring system will be connected to the internet network where the data will be sent to a cloud data server. The recorded data can then be downloaded using a mobile device or personal computer connected to the internet network. This IoT-based monitoring system was chosen so that performance data from the dryer can be monitored in real-time and online. The results of this study are a prototype dryer with a household capacity of 9 Kg equipped with an IoT-based monitoring system has been built and can be implemented properly
Effect of Volume Fraction and Alkalization Treatment on Mechanical Properties of Abaca Fiber Reinforced Composites as a Composite Board Substitute for Wood Products Abubakar Dabet; Zulmiardi Zulmiardi; Ferry Safriwardi
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.v21i1.3125

Abstract

Wood products are very popular products, especially in Indonesia. The drawback of wood products lies on their physical properties which are very susceptible to weathering in contact with water, causing wood products to be unsuitable for placing in parts of higher moisture. In addition, deforestation for processing wood products causes prolonged environmental damage. The main objective of this research is to make abaca fiber polyester composite material that can be used as a composite board for replacing wood product boards. The composite is made with varying the alkali solution treatment and fiber volume fraction by using the vacuum method (VARI).  Materials used in this study are abaca banana fiber, polyester resin, hardener and wax. The primary equipment used are such as tensile testing machine, freis machine, scanning electron machine (SEM), press machine, vacuum installation and digital scales as well as other supporting tools for composite preparation and fabrication. The research design for the preparation of composite test specimens used a polyester matrix and Abaca fiber reinforcement. Variation of alkalization solution used have rate of 1%, 3%, 5%, 7%, and 9%, and the volume fraction of abaca fiber is at 15%, 20%, 25%, 30% and 35%. The composite specimens test uses a tensile test ASTM D3039-76 standard, flexural test using the ASTM D790 standard and an impact test reaching the Charpy method. The results showed there are the highest tensile strength and modulus of elasticity were obtained from composites with specifications of 25%Vf and 5% alkali treatment of 186.89 MPa with a modulus of elasticity of 2.27 GPa. The highest bending strength value is found in the composite with a specification of 35%Vf and 5% alkali treatment with a bending strength value of 53,03 MPa. The highest impact strength value was found in the composite with a specification of 25%Vf and alkali treatment with a 5% concentration of 9,32 kJ/m2. Based on the mechanical properties data above, the composite specifications can be recommended for the manufacture of composite boards as a substitute for wood products at 35%Vf and 5% alkali treatment. 
Optimasi sudu miring terhadap kekasaran permukaan material kuningan pada proses turning Maw ardi
Jurnal POLIMESIN Vol 6, No 2 (2008): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jop.v6i2.1373

Abstract

Pada proses permesinan sering kita temukan perbandingan putaran dengan sudut kemiringan pahat yang tidak sesuai sehingga tidak jarang hasil yang diperoleh tidak optimal, seperti hasil permukaan produk terlalu kasar dan putaran spindel yang berlebihan. diperlukan suatu penelitian untuk mengoptimalkan proses pemotongan pada proses bubut melalui penyesuaian kecepatan potong dengan sudut miring dari pada pemakanan. Penelitian ini pada akhirnya bertujuan untuk mendapatkan hasil yang optimal dalam hal ini kekasaran permukaan terhadap variasi sudut miring pahat potong dan putaran spindel mesin. Material untuk spesimen duri jenis bahan kuningan Pahat potong yang dari jenis HSS berukuran 12 x 12 x 100 mm. Mesin bubut yang akan digunakan dalam proses pengerjaan pembubutan yaitu mesin bubut merk Pindad. Variabel kemiringan sudut potongnya yaitu 30”, 60”, dan 90”, kedalaman pemakanan (a), yaitu 0,2 dan 0,4. serta gerak makan ( 420,065. Dari perbandingan variasi sudut kemiringan pahat 30, 60, dan 90” dengan ketebalan pemakanan fa) 0,2 dan 0,4 serta gerak makan ()) yang tetap yaitu 0,065. dapat diketahui bahwa, pada sudut kemiringan pahat 30, terjadi penurunan putaran lebih besar dari pada variasi sudut kemiringan pahat yang lainnya. Hasil penelitian menunjukan sudut kemiringan pahat 60 mempunyai tingkat kekasaran yang lebih tinggi dibandingkan sudut 300 dan 90. Sudut kemiringan ejekhf dari pahat untuk pembubutan material jenis kuningan adalah pada sudut 90”.Kata kunci : Turning, Kekasaran permukaan, Kuningan, Sudut kemiringan
Rotary friction welding of 304 stainless steel: parametric study, mechanical properties, and microstructure of the joint Hudiyo Firmanto; Susila Candra; Mochammad Arbi Hadiyat
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.v22i2.4978

Abstract

In the rotary friction welding process, the selection of process parameters affects the friction, heat generation, and joint formation. These factors collectively cause microstructural changes that determine the mechanical properties of the joint. Therefore, the process parameters, microstructure, and mechanical properties were interconnected during rotary friction welding. This study examined the influence of process parameters on their correlation with microstructure and mechanical properties in the rotary friction welding of 304 SS. A 3×4 full factorial experimental design was used to evaluate the effects of the process parameters on the microstructure and strength of 304 SS joints produced through rotary friction welding. An accurate evaluation of joint strength was performed using the notch tensile test technique. The joint with the highest strength was achieved by applying a combination of friction pressure and friction time at 55 bars and 3 seconds, respectively, resulting in a welding efficiency of 103.6%. A very low friction time (i.e., 5 s) produced a weak joint, which should be avoided. The welding process created three distinct structural zones in the joint: a joint structure finer than the parent metal structure, a partially deformed structure, and a heat-affected zone with deformation. Hardness tests of the joints showed a high hardness in the deformed structure. The formed structure contributes to the resulting joint strength.
Optimization of S-EDM Process Parameters on Material Removal Rate using Copper Electrodes Khoirudin Khoirudin; Sukarman Sukarman; Nana Rahdiana; Ade Suhara; Ahmad Fauzi
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.v21i1.3199

Abstract

This article demonstrates that the sinker electrical discharge machining (S-EDM) method can be enhanced using SPHC (JIS G 3131) materials with a hardened surface. During S-EDM, neither contact nor a cutting force exists between the electrode and the workpiece. S-EDM is advantageous because it eliminates mechanical stress, chatter, and vibration issues with traditional milling. S-EDM is widely employed, for example, in the manufacturing of molds for automotive and aviation components. Taguchi design and signal-to-noise ratio (S/N ratio) were selected to examine the impact of the input parameter model on the material removal rate (MRR). The Taguchi approach assessed three input parameters and three experimental levels. The parameters pulse current (I), spark time (Ton), and gap voltage (Vg) were chosen to evaluate the MRR performance of the S-EDM process with the SPHC-hardened workpiece material. Copper with a diameter of 10 mm is chosen as the electrode material. This study aims to determine the optimal MRR for the chosen input variables. Results indicate that a more effective pulse current value promotes debris removal from the machining zone and stabilizes following spark release, speeding the material removal rate (MRR). In the S-EDM machining process, the pulse current value significantly affects the MRR and is one of the most significant response variables
A study on Flame Characteristics Premixed Burning by Giving Magnetic Field Induction Deny tomy andrianto; Muh. Nurkoyim Kustanto; Yuni Hermawan; Nasrul Ilminnafik; Salahuddin Junus
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.v21i2.3497

Abstract

This study aims to compare the effect of magnetic field induction on the characteristics of the fire resulting from the combustion of premixed biodiesel calophyllum inophyllum . Further research on premixed combustion flames due to magnetic field induction. As time goes by, petroleum is currently running low, therefore alternative biofuels are needed. One type of non-food vegetable oil is Jatropha and calophyllum inophyllum  oil, besides not being consumed, it can be processed into biodiesel as fuel. To get a more effective and efficient flame, you can apply a magnetic field effect to the fire, especially in terms of the burning rate of the fire. The experimental research method is to heat calophyllum inophyllum biodiesel until it is in the form of steam, then flow it to the burner which will then be given air which is controlled by the flow mass. Then the fire is ignited and the mass of the air flow is increased until the fire is lifted until it is extinguished. Two magnets are placed between the burners by varying the direction of the magnetic field N-S, N-N and the results of this study are the shape of the flame. The resulting fire is more transparent, clearer and more visible. The direction of the N-S magnetic field causes the temperature to be higher than the direction of the N-N magnetic field. The high and low of the flame is affected by the direction of the magnetic field, the stronger the N-S magnetic field. The magnetic field can affect the burning speed of the biodiesel flame. In a poor mixture (ϕ 1) in the presence of magnetic influence, the rate of fire is lower without the influence of a magnetic field, but in a rich mixture (ϕ 1) in the presence of a magnetic influence, the rate of fire is higher than without the influence of a magnetic field. This is due to the magnetic influence that induces oxygen. Oxygen is paramagnetic, so it can be attracted by magnetic fields.
Kaji eksperimental pengaruh ukuran dan komposisi filler komposit polyster serbuk kayu terhadap sifat mekanik dan permukaan patahan statik. Azwar Azwar; Bukhari Bukhari
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.v2i1.1410

Abstract

Penggunaan serat alami sebagai pengisi (filler) dan penguat (reinforcement) pada pembuatan komposit merupakan suatu paradigma untuk mengahasilkan suatu material bio-komposit yang ramah lingkungan. Serat almi yang berasal dari  tumbuh-tumbuhan  terdapat dalam jumlah yang sangat potensial di Indonesia yang bisa diproses menjadi serat bio-komposit berkekuatan tinggi. Penelitian ini dilakukan untuk mempelajari pengaruh komposisi dan ukuran filler serbuk kayu terhadap sifat mekanik pada pembuatan komposit polyester serbuk kayu. Material komposit dibuat dengan proses hand lay-up satu tahap .dengan  memvariasikan ukuran dan komposisi filler. Filler  serbuk kayu diberikan perlakuan awal untuk mendapatkan ukuran dan sifat yang seragam. Dimensi dan konsfigurasi specimen uji dibuat mengikuti standar ASTM D 79() -RI. Proses pengujian dilakukan menggunakan Universal Testing Machine dengan uji bending tiga titik untuk menentukan tegangan bending. modulus elastisitas. regangan bending dan sudut defleksi . Dart hasil penelitian diperoleh harga tegangan bending tertinggi 15.3 Pa. dan modulus elastisitas tertinggi 65.362 MPa. regangan terbesar 2.25 % dan sudut defeleksi terbesar 6. 67. Dari penelitian ini disimpulkan bahwa ukuran dan komposisi filler serbuk kayu mempengaruhi sifat mekanik komposit dimana sifat mekanik yang baik akan didapat bila filler terdistribusi secara merata di dalam matriks. Permukaan patah static menunjukkan perpatahan yang terjadi secara umum adalah patah matrik .juga terdapat gejala debonding. fiber breaking serta pengaruh voids.
Kaji eksperimental perbedaan perpindahan panas peleburan parafin sebagai material penyimpan panas pada alat penukar kalor pipa mulus dan pipa bersirip Zulkifli Zulkifli
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.v15i1.371

Abstract

Dalam penelitian ini, kajian eksperimental berkaitan dengan perpindahan panas laten dan penyimpanan energi termal menggunakan tabung pipa mulus. Sebuah unit  eksperimental terdiri dari akuisisi data, heat exchanger jenis shell and tube digunakan untuk meningkatkan perpindahan panas, pipa fluida panas dirancang mulus (tanpa sirip). Lilin parafin digunakan sebagai media penyimpanan termal. Karakteristik perpindahan panas dari fluida ke lilin parafin diselidiki dalam kondisi fluks panas yang berbeda. Hasil percobaan menunjukkan bahwa karakteristik transfer panas menunjukkan kesamaan untuk tabung penukar panas. Pada proses pemanasan awal didominasi oleh konduksi, tetapi pada suhu leleh didominasi oleh perpindahan panas konveksi.Kata kunci: Parafin, perpindahan panas, penyimpanan panas, pipa mulus, pipa bersirip
Planning analysis of solar power plant utilization using the PLN network grid system interconnection on Samudra University roof building ferri Festika; Ahmad Syuhada; Hamdani Umar
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.v21i4.2621

Abstract

Solar power plants can be applied in various forms of installation, either centralised or distributed, with each configuration system installation being either on-grid or off-grid. Samudra University plans to install a solar power plant for environmentally friendly applications and energy savings. The purpose of this study is to investigate the feasibility and benefits of Samudra University installing solar power generation capacity using a single-owner system on campus using SAM (System Advisor Model) applications using two axes with PV energy. The method used is to model the photovoltaic results with the System Advisor Model (SAM), which can develop new renewable energy photovoltaics. The use of solar energy as a producer of electrical energy in buildings at the ocean university by using the System Advisor Model application on the Single Owner (Grid) system in collaboration with local electricity (PLN) to continue the energy needs produced as much as 32,652,394 kWh will cost Rp. 372,864,450,000, and with an area of 105,179.9 m2 or ± 11 hectares of the total area of 49.8 hectares, it only uses ± 20% of the total area
Sistem Pendingin Tertutup Pada Mesin Diesel Tipe Diesel MAK 8M32 Sebagai Penggerak Utama Kapal Motor LIT ENTERPRISE Waris Wibowo; Ningrum Astriawati
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.v19i1.2016

Abstract

Sistem pendingin berfungsi untuk menjaga kestabilan suhu pada bagian mesin, sistem pendingin tertutup menggunakan dua media pendingin yaitu air tawar dan air laut. Tujuan dari penelitian ini adalah untuk mengetahui bagaimana perawatan sistem pendingin tertutup pada mesin diesel tipe  DIESEL MAK 8M32 sebagai penggerak utama KM LIT ENTERPRISE. Penelitian ini dilaksanakan di kamar mesin Kapal KM. LIT Enterprise milik PT. Indonesia Timor Line Penelitian ini menggunakan metode pendekatan deskriptif Kualitatif. Metode pengumpulan data menggunakan metode Observasi (pengamatan), metode interview atau wawancara dan metode dokumenter. Dari hasil penelitian menunjukkan bahwa perawatan sistem pendingin mesin utama pada kapal KM. LIT Enterprise milik PT. INDONESIA TIMOR LINE sudah berjalan dengan baik dan dilakukan sesuai prosedur atau sesuai dengan manual book. Pelaksanaan perawatan pada komponen sistem pendingin mesin utama meliputi : Exspansion Tank, Pompa Air tawar, Cylinder Liner, Kepala Cylinder, Fresh Water Cooler. Jenis kegiatan perawatan pada KM. LIT Enterprise meliputi  perawatan berkala dan perawatan tidak terduga. Perawatan berkala meliputi perawatan harian, perawatan setiap 50-250, perawatan setiap 500-1000 jam.

Page 7 of 51 | Total Record : 503

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