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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 25 Documents
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Search results for , issue "Vol 20, No 2 (2022): August" : 25 Documents clear
A review of solar drying architecture: Direct, indirect and mixed-mode solar dryer Permana Andi Paristiawan; Ihwan Ghazali; Dwi Aryanti; Budiarjono Budiarjono; Ayu Amanah; Muhammad Idris; Dhany Hermansyah; Esam Abu Baker Ali
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.v20i2.3071

Abstract

Solar energy is available in abundance. It is considered an effective energy source for drying agricultural products. Although it is affordable, open sun drying suffers from both qualitative and quantitative issues caused by unexpected environmental conditions (rain, dust), animals (insects, birds, rodents), and over-or under-drying. Therefore, it is important to introduce a better drying technology to preserve solar energy without deteriorating the quality of the drying product. For that reason, solar dryers have been developed to produce higher drying temperatures and lower relative humidity that will eventually lead to superior drying rates and reduced final moisture contents compared to the conventional open sun drying method. Therefore, not only does the solar dryer meet the requirements of agricultural products, but it also saves energy, time, and money.
Design and experimental test of runner blade for small axial pico-propeller turbines model Pribadyo Pribadyo
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.v20i2.2977

Abstract

Environmental degradation due to the use of conventional fossil fuel remains an obstacle to sustainable development. For this reason, many countries currently consider the integration of renewable energy sources into their power sectors as an economically friendly and promising alternative to the use of fossil fuels. One form of green technology is the pico-propeller turbines. This turbine works based on the pressure of flowing water and its best performance is determined by the hydraulic stability of its blades. It is thus necessary to design suitable and hydraulically stable runner blades for these turbines. Therefore, this study aims to design a suitable runner blade for a pico-propeller turbine model that will aid in the optimal extraction of electrical energy from the fluid flow in sewer lines. The turbine wheel consists of four blades per section with a diameter of 0.150 meters and a pivot point of 0.30 meters and it was designed to fit a 5-inch diameter pipe with blade angle configurations of 25°, 30°, and 35°. Furthermore, performance tests were conducted at different flow rates, ranging from 0.00134 m3/s to 0.0047 m3/s with a 3.5 m head, after which the findings were compared to that of the other research. The results showed that maximum efficiency and performance were achieved with the blade angle of 25° at a flow rate of 0.0027 m3/s.
Production Monitoring System Using Overall Equipment Effectiveness (OEE) Method to Improve Stamping Machine Performance Gun Gun Maulana
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.v20i2.2560

Abstract

One of the factors that support success in the manufacturing industry is the smoothness of the production process. There are six factors that affect engine performance, known as the Six Big Loss. Six significant losses are the cause of production equipment not operating normally, namely: start-up loss, set up or adjustment loss, cycle time losses, speed loss, breakdown loss and defect loss. Downtime that often occurs results in decreased productivity, and production results do not reach the target. Production machine downtime is often not known by some parties, especially superiors positions such as managers, section heads and maintenance division. The goal to be achieved in this research is to design and realize a performance monitoring system for a stamping machine based on the internet of things (IOT) to increase the effectiveness of the machine with the optimal amount of production. The method used to determine machine performance is Overall Equipment Effectiveness (OEE). OEE is one of the methods available in TPM or Total Productive Maintenance. The study results show that machine downtime notifications are informed quickly using an alarm system.
Development of MQL (minimum quantity lubricant) automation in applying cutting fluid on lathes Aris Zainul Muttaqin; Mahros Darsin; Yohan Rizal Kharisma; Ahmad Syuhri; Muhammad Trfiananto
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.v20i2.2618

Abstract

It is normal to apply cutting fluid to machining, but using it excessively will harm the environment. One of the efforts to reduce it is to apply minimum quantity lubrication (MQL). This study aims to minimize the use of cutting fluid by designing a cutting fluid delivery system with Arduino Uno control. The developed MQL system can be controlled both based on temperature and time. This MQL system was a development from the previous system by replacing the limit and temperature sensor, nozzle, and mini compressor with a sprayer. The performance of this new MQL system was compared to a flooded cutting fluid feeding system. The experimental design of Taguchi L9 (3^4) with additional varied factors such as depth of cut, cutting speed, and feed rate. Each factor consisted of 3 levels. The measured output was cutting fluid consumption. S/N ratio analysis showed that the method of giving the cutting fluid most dominantly affected the outcome. ANOVA showed that more than 97.56% of the factors were dominated by the method. The combination of factors that would produce a minimum burst at a rate of 180 ml/hour if applying a combination of factors and a level of depth of cut 1.8 mm and a cutting speed of 120.89 m/min, provision of cutting fluid with the periodic MQL method and feed rate of 0.122 mm/rev. Meanwhile, the metal removal rate (MRR) analysis recommended the use of periodic cutting fluid methods at a depth of cut of 2.2 mm. The development of the new MQL either temperature control or periodic system control, both were able to comply with the MQL criterion, i.e. the maximum spray of 500 ml/h.
Neural network approach for predicting aerodynamic performance of NACA airfoil at low Reynolds number Mohamad Yamin; Zaid Al Kahfi Ramadhan
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.v20i2.3065

Abstract

In designing and developing airfoils, confirmation of proper design performance under various flow conditions is vital. Experimental studies using wind tunnels or numerical simulations can often utilize. In some cases, numerical studies have a weakness in computational time. This study focuses on predicting the drag coefficient of the airfoil using the CNN machine learning architecture. Starting with a numerical simulation of 500 types of NACA airfoils with a Reynolds number of 4000 using XLRF5 software to obtain image data, lift and drag coefficients. The training, test, and validation dataset uses numerical simulation results as labels. ReLU is the activation function used in this study, with Adam optimizer and MSE loss function. It achieved a relative error of 8% in predicting the drag coefficient. With the results obtained, aircraft designers can use the method to predict the drag coefficient value from various geometries.
Synchronization of Treadmill Speed to Bicycle Model Speed Based on PID Controller Baskoro Latu Anurogo
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.v20i2.2611

Abstract

 Bad weather and crowded vehicle lanes are often obstacles for cyclists during practice. Bicycle treadmills are the right solution to answer these demands. A person can cycle on a treadmill without having to leave the room. The rotation speed of the treadmill will be determined by the rotational speed of the bicycle wheels, so the bicycle will not fall off the treadmill. For this reason, this study aims to design a PID-based controller that will control the rotational speed of the treadmill so that it is in sync with the rotational speed of the bicycle wheel. The rotation of the bicycle wheel is represented by the wheel of a bicycle model that rotates on a treadmill, while the treadmill is represented by a model in the form of a conveyor. The results showed that in the first second, the conveyor speed was not the same as the speed of the bicycle model. Even so, after 1.5 seconds, the conveyor can catch up to the speed of the bike model. Despite some glitches, the conveyor can keep up with the speed of the bike model.
Kaji Eksperimental Pengaruh Campuran Bahan Bakar Bioetanol-Bensin Terhadap Unjuk Kerja Mesin SI Asnawi Asnawi; Adi Setiawan; Muhammad Sayuthi; Tri Waluyo; Hagi Radian
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.v20i2.2645

Abstract

Bioethanol is a clean fuel, renewable energy source that can be used in place of fossil fuels. Bioethanol has similar characteristics to gasoline fuel, making it an excellent alternative fuel for SI engines, contributing to the reduction of air pollution, the increased use of biofuels, and the removal of fossil fuel consumption. Analysis of the SI engine performance using gasoline fuel with an octane rating of 90 and gasoline-bioethanol blends containing up to 20% bioethanol concentration, each fuel blended at 5% by volume fraction. The purpose of this study is to present the experimental results for a spark ignition (SI) engine with a single injector that operates by using a gasoline-bioethanol blend as fuel. Analysis of the SI engine performance by using gasoline fuel with an octane rating of 90 and gasoline-bioethanol blends containing up to 20% bioethanol concentration. Each fuel was blended with bioethanol at an interval of 5% by volume fraction. The test was conducted on an SI engine with a capacity of 1500 cc, four cylinders, and a single injector was used to distribute fuel to each cylinder through the intake manifold. The shaft of the engine is connected to a 75 kW of eddy current dynamometer shaft to measure the engine torque. The engine load is controlled using an interface computer system. Load on an engine is done by increasing braking on the dynamometer, and real-time signals from the sensors are recorded. Each fuel sample is operated at full load or wide-open throttle (WOT) at speeds ranging from 1000 to 5500 revolutions per minute (rpm). The experiments show that adding bioethanol to gasoline fuel can have a significant effect on the single injector SI engine performance. When the bioethanol concentration of 10% (E10) by volume is used, it is possible to maintain engine power with lower fuel consumption or lower the energy supply to the engine cylinder, thereby increasing the thermal efficiency of the single-injector SI engine by 6.33% compared to gasoline fuel.
Photovoltaic (PV) thermal performance simulation using segmentation lapping fin passive cooling Ahmad Yonanda; Amrizal Amrizal; Harmen Harmen; Ahmad Riszal; Fauzi Ibrahim
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.v20i2.3041

Abstract

The sun is a renewable energy source that has several advantages such as being easy to obtain, free of pollution, and available in sufficient quantities. The heat energy received by the photovoltaic can cause an increase in surface temperature, resulting in a decrease in electrical efficiency. One of the efforts to increase photovoltaic electrical efficiency is using air cooling, by adding absorber fins or thermal photovoltaic (PV/T). The lapping type fin has superior performance in reducing the temperature of the PV module compared to the linear (conventional) fin type. The purpose of this study was to compare the performance of thermal PV using conventional fins with lapping segmentation fins carried out using the CFD approach using ANSYS Fluent. The simulation test procedures include: making linear fin geometry (conventional), linear lapping and segmentation lapping, conducting mesh quality studies, and determining boundary conditions and modeling parameters. Modeling variations in the direction of airflow 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The numerical simulation results show that the use of segmented lapping fins can reduce the PV surface temperature by 1.79 °C or about 4.11% compared to conventional (linear) lapping in the airflow direction of 90º (parallel to the fins). The results of this study support the use of integrated PV and passive cooling systems to reduce efficiency losses in actual conditions, where there is a multidirectional airflow characteristic, which may not be advantageous for conventional heatsinks.
Simulation and Experimental Evaluation of Tensile Properties and Macrostructure Changed of 3D printer PLA Filaments Syaharuddin Rasyid; Rusdi Nur; Muas Muchtar
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.v20i2.2929

Abstract

The use of printing products with 3D printing has been widely used in everyday life, but research regarding its strength and performance is still limited. Therefore, simulation and experimental approaches are used in this paper to analyze the characteristics of PLA+ materials produced by 3D printers. a. Design tensile test specimens and static stress tests in Autodesk Fusion360; b. Calculate the weight of the tensile test specimen; c. Print tensile test specimens with variations in infill (60, 80, and 100%) and print direction (0, 45, and 90 deg); and d. Experiment with macrostructure, weight, and tensile tests. The conclusions of this study are; a. PLA+ material properties (macrostructure, weight, tensile strength, tensile strain) have been obtained experimentally and through simulation, b. The tensile strength of the simulated PLA+ material is higher than the experimental test results, c. The level of density (infill), affects the weight and tensile strength, and d. The direction of the impression affects the tensile strength, but weight and tensile strain have no effect.
Pengaruh Fraksi Volume Komposit Poliester Diperkuat Serat Rambut Manusia Dan Serabut Kelapa Terhadap Sifat Mekanik akbar anggoro putra
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.v20i2.2935

Abstract

Currently, composite applications range from the automotive, marine, and even aircraft sectors. One of the composites that have attracted a lot of attention from researchers is composites with natural fibers because natural fiber composites can be used as an alternative to synthetic or plastic materials. The low-density nature of natural fibers can provide good stiffness and strength as in fiberglass-reinforced composites. Coconut coir fiber and human hair waste are the basic materials for the manufacture of composites in this study. Because the amount is abundant so it is easy to obtain. The purpose of this study was to determine the effect of the variation of the best volume fraction of natural fiber composites with polyester matrix on the mechanical properties. The method used is hand layup with 3 variations of fiber volume fraction and polyester matrix, respectively 10:90, 15:85, and 20:80 and with the size of short hair fibers with a size of 3 cm and long coconut fibers with sizes according to the length of the print. The ratio of human hair fiber and coconut fiber is 1:1. Each fraction was tested 3 times to be more accurate. The results of the average tensile strength test with the largest ASTM D638 standard are at the volume fraction of 10:90 with a tensile strength of 19.2 MPa and the average impact test strength with the largest ISO 179-1 standard at the volume fraction of 20:80 is 17, 67 kJ/m². This study showed that the higher the fiber fraction in the composite, the lower the tensile strength but the higher the impact strength. Vice versa, the lower the fiber fraction in the composite, the tensile strength increases but the impact strength decreases.

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