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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 15 Documents
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Search results for , issue "Vol 21, No 3 (2023): June" : 15 Documents clear
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.
Analysis of intake air temperature effect on performance of portable atmospheric water generation (PAWG) systems with heat sink angle orientation of 75o Muhamad Jafri; Ben Vasco Tarigan; Hairman Sahrudin Lanae
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.v21i3.3364

Abstract

The increasing demand for clean water and the diminishing supply of clean water sources can result in a clean water crisis. Air is a ubiquitous, inexpensive, and clean water source. Using Atmospheric Water Generators (AWG), the water contained in the air can be extracted. This study's objective was to determine the effect of inlet air temperature and air heater power variations on tool performance and PAWG condensate water production at a condenser angle of 75 degrees. The procedure utilized is experimental on three PAWG boxes. Each box has a distinct temperature at its entrance. The variation of inlet air temperature is accomplished by heating the air before it enters the box with an air heater; the applied power variations are 0.484 Watt, 0.964 Watt, and 1.702 Watt. The results demonstrated that variations in air heater power and inlet air temperature affected system performance and condensate water production. Maximum water discharge and PAWG performance were achieved when the air heating power was 0.48 watts and the water discharge was 1.166 milli liters per hour. At 0.0084 ml/h/W, the PSys system performance had the highest value. The variable air heating power of 0.946 Watt represents the utmost COP value of PAWG. This power variable has a high temperature difference and influences the COP value at high levels.
Hardening of bucket teeth made from creusabro 8000 steel by using the induction hardening method Darma Firmansyah Undayat; Cecep Ruskandi; Ari Siswanto
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.v21i3.3672

Abstract

Excavators are often used in mining projects such as for penetrating, excavating, dredging, gouging, and crushing mineral rocks. Bucket teeth are an excavator component that is often being replaced due to failure. The most common failure mode that occurred in bucket teeth was wear on the tip or front section of it. To reduce the wear of the bucket teeth material then its hardness should be increased. As the hardness value increases, the resistance to wear increases. The bucket teeth were made of Creusabro 8000 steel and a hardening process was then carried out on the front section of the bucket teeth components by using an induction furnace. The power used in the induction furnace varies from 28, 35, 42 and 49 kW (kilowatts) and the holding time varies between 3 and 5 minutes. The heat treatment process used oil as a cooling medium. The analysis was carried out to determine the area that experienced an increase in hardness and its occurred microstructure. Microstructure examination was carried out with an optical microscope, and hardness test by using a Vickers microscopy. It can be concluded from the result of the analysis that the large area experienced an hardness increase is directly proportional to the electric current magnitude and holding time. The microstructure has changed from fine pearlite to martensite thus hardness of Bucket Teeth can be increased up to 100% of the initial hardness.
Experimental investigation on strain behavior of jute/polyester composite with an open hole under axial loading Anggit Murdani; Utsman Syah Amrullah; R.N. Akhsanu Takwim
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.v21i3.3931

Abstract

Mechanical assembly requires joint mechanism involving fasteners and holes. Deformation of the holes will greatly affect the integrity of the mechanical joins. This research objective is to reveal the strain behavior of jute/polyester composite containing open hole under axial loading. It is very important to know the behavior of the strain surrounding the hole under loading. Experiments were carried out by preparing jute/polyester composites. The composites were manufactured by using a vacuum infusion method. There are two configurations of the number of laminations, i.e., 3 and 5 sheets and of hole sizes, i.e., 5 and 10mm holes. An axial load is applied to the specimen through a tensile test. Strain gauges are attached near the holes, axially and laterally. Strain in axial and lateral directions in the vicinity of a hole is recorded and presented. The research result shows that the strain gauges located parallel to the loading axis indicate a positivestrain value. On the other hand, the strain gauges located lateral to the loading axis indicate a negative value. Furthermore, the strain gauges located beside the hole in the direction parallel to the loading axis indicate the highest strain value in all types of specimens.
Effects of bioethanol addition to the biodiesel-diesel fuel blend on diesel engine exhaust emissions Asnawi Asnawi; Muhammad Muhammad; Abdul Rahman; Nurul Islami; Diki Dian Andika; Ihsanul Fikri Hutabarat; Irwansyah Situmorang
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.v21i3.3460

Abstract

The transition of energy sources from fossil fuel to biofuel is becoming a major topic in the world towards renewable energy to reduce greenhouse gas emissions, improve environmental air quality, and reduce dependence on fossil fuel in the future. This study aims to evaluate the effect of increasing the concentration of oxygenated biofuel in diesel fuel on the emissions of diesel engines. In this study, B30 (30% biodiesel and 70% diesel) was used as a base fuel, and a fraction of pure biodiesel (B100) was added to increase the biodiesel concentration in B30 fuel to create B40 (40% biodiesel and 60% diesel). Furthermore, the addition of 5% and 10% of bioethanol as a fuel additive in the fuel blend was conducted while maintaining a biodiesel concentration of 40%. The effect of bioethanol contained in the fuel blends was tested using a single-cylinder 418 cc diesel engine.  The experiment was carried out at an engine speed of 1000–3000 rpm. The result shows that the concentration of the diesel-biodiesel-bioethanol blend affected the emissions produced by the diesel engines. Combustion efficiency increased with the concentration of biodiesel in the diesel fuel, as shown by reduced CO emissions, increased CO2 emissions, and increased NOx emissions at engine speeds of 2000–3000 rpm. In comparison to 5% bioethanol at various engine speeds, adding 10% bioethanol has a disadvantageous effect on the combustion process, increasing CO and HC emissions.
Effect of sintering temperature on crystal structure and physical properties of the Mg0,92Zn0,05C0,03 Alloy Budiarto Budiarto; Susilo Susilo
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.v21i3.3719

Abstract

The effect of sintering temperature on the crystal structure and physical properties of the Mg0,92Zn0,05C0,03 alloy has been studied. Magnesium-based alloys are one of the alloys that have been used in industry, the health sector, and as biodegradable materials and biomaterials. The aim of this study was to determine the effect of temperature and sintering holding time on crystal size, dislocation density, microlattice strain, and yield strength, porosity and density of Mg0,92Zn0,05C0,03 alloy. The results of testing the crystal structure of the alloy Mg0,92Zn0,05C0,03 with an X-ray diffractometer showed several diffraction peaks consisting of the main phase α–Mg and a small part of the MgZn phase. Testing of Mg0,92Zn0,05C0,03 alloy after sintering with variations in temperature and 90 minutes holding time for crystal size showed that the higher the sintering temperature (425 0C to 575 0C) the crystal size value decreased significantly from 82.36 nm to 18.75 nm, and the dislocation density increased from 0.113 to 0.868 lines/mm2. For micro strain decreased from 0.015 to 0.0087. However, in the very small porosity test, the increase was from 29.8% to 31.9%. As well as for density (1.8 gr/cm3) and yield strength (274 MPa) there was no significant decrease of around 1.4%, but the synthesized Mg0,92Zn0,05C0,03 alloy fulfilled as a bone implant bio material.hhThe effect of sintering temperature on the crystal structure and physical properties of the Mg0,92Zn0,05C0,03 alloy has been studied. Magnesium-based alloys are one of the alloys that have been used in industry, the health sector, and as biodegradable materials and biomaterials. The aim of this study was to determine the effect of temperature and sintering holding time on crystal size, dislocation density, microlattice strain, and yield strength, porosity and density of Mg0,92Zn0,05C0,03 alloy. The results of testing the crystal structure of the alloy Mg0,92Zn0,05C0,03 with an X-ray diffractometer showed several diffraction peaks consisting of the main phase α–Mg and a small part of the MgZn phase. Testing of Mg0,92Zn0,05C0,03 alloy after sintering with variations in temperature and 90 minutes holding time for crystal size showed that the higher the sintering temperature (425 0C to 575 0C) the crystal size value decreased significantly from 82.36 nm to 18.75 nm, and the dislocation density increased from 0.113 to 0.868 lines/mm2. For micro strain decreased from 0.015 to 0.0087. However, in the very small porosity test, the increase was from 29.8% to 31.9%. As well as for density (1.8 gr/cm3) and yield strength (274 MPa) there was no significant decrease of around 1.4%, but the synthesized Mg0,92Zn0,05C0,03 alloy fulfilled as a bone implant bio material.
Analysis of liquid rocket propellant in nitroglycerin injector reactors maryono maryono; Muhammad Akhlis Rizza
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.v21i3.3826

Abstract

The propulsion of the rocket is due to the thrust resulting from the combustion rate. The propellant energy can be increased by increasing the fuel pressure and temperature of the propellant. Increasing the pressure and temperature of the propellant will increase its combustion rate and the operating conditions of the rocket motor. The most effective liquid propellant used is Nitroglycerin (NG). Nitroglycerin was prepared using the glycerol nitration method with the principle of an injector-based reactor. Therefore, in this research, nitroglycerin was made using the Injector Reactor method with variations in flow rate and injection volume. The results showed that the effect of variations in flow rate and solution volume on the synthesis of nitroglycerin caused a change in solution temperature. Flow rate is closely related to the volume of solution used. The higher the temperature produced, the more heat energy will increase so that the pressure and combustion rate of the propellant increase. The most optimum results use a flow rate of 200 µm/s and a solution volume of 6 ml of glycerin, nitric acid, and sulfuric acid each with a temperature of 37.6oC.
Investigation of fuel properties and structural-functional group analysis in blending low and high boiling point fuels: the case of ethanol with fuel Annisa Bhikuning; Budi Setiawan; Jamal F. Jati; Jefa D. I. Wijaya; Muhammad Hafnan
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.v21i3.2982

Abstract

For numerous decades, diesel fuel has served as the primary source of energy for diesel engines. For optimal performance, these engines are designed to withstand a high flammability threshold. Diesel fuel is therefore the preferable option for refueling military combat vehicles, particularly battle tanks. Concerns have been expressed regarding the use of diesel fuel due to its potential contribution to environmental pollution; emissions from combustion include NO2, NO, CO, SO2, and particulate matter. To reduce these emissions, diesel fuel must be blended with another substance. To reduce emissions, ethanol incorporation is a potential solution. A previous study demonstrated that combining fuels with high and low boiling points can enhance performance. Mixing ethanol, which has a low boiling point, with biodiesel/diesel fuel and fuel with a high boiling point can produce a superior fuel. Analyzing the characteristics of the fuels produced by merging ethanol with diesel fuel and biodiesel is crucial. This analysis aids in the comprehension of the fuel's physical properties prior to its use in a diesel engine. In this investigation, Indonesian diesel fuel and biodiesel standards are blended with ethanol at 10%, 25%, and 35% (volume) blending ratios. In addition to utilizing FTIR (Fourier Transform Infrared Spectroscopy) for analysis, the objective of this study is to determine the combustion properties of a blend of biodiesel, diesel fuel, and ethanol. Using the American Society of Testing Materials (ASTM) D method, fuel properties such as density, viscosity, cetane index, and distillations are analyzed. The results indicate that increasing the proportion of ethanol in diesel fuel and biodiesel reduces viscosity and density. By integrating ethanol, which has a lower density and viscosity than diesel fuel and biodiesel alone, the fuel properties can be improved. A perfect blend of ethanol, diesel fuel, and biodiesel can increase the quality of fuel, thereby enhancing diesel engine combustion.
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.
AI-based face recognition system with telegram notification for room security on raspberry PI Deni Kurnia; Afzeri Afzeri; Imam Muis H; Slamet Riyadi; Adolf Asih Supriyanto; Feri Siswoyo Hadisantoso
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.v21i3.3534

Abstract

This research is based on the importance of a security system in a room by implementing AI combined with the telegram notification system. The goal is that security information can be obtained quickly and in real-time. The methodology used is to design a hardware system consisting of input, process and output devices. The input device consists of a Logitech C270 camera mounted on 2 MG966R type servo motors so that the camera can rotate on the X and Y axes, then the results of the camera captures are processed using the Haar Cascade Classifier and Local Binary Pattern Histogram (LBPH) algorithms. Raspberry Pi 4 is used as a data processing center and push notification to telegrams in the form of images when faces are detected by a web camera. Only registered users may enter the room, by opening the door when a face is recognized. Our findings show that a room security system with an AI-based facial recognition application can be implemented, according to the planning and design results in this study. The door opening process produces an average result of 4.586 seconds, with the longest time being 4.981 seconds and the fastest time being 4.116 seconds. The door closing process produces an average result of 4.496 seconds, with the longest time being 4.966 seconds and the fastest time being 4.106 seconds. The average time of opening and closing the door is ideal and safe. From the results of the research that has been done, it can be concluded that the use of AI in this study aims to make decisions that only registered users can enter a room. In addition, the ability of the camera to move dynamically on the x and y axes is one of the system developments that did not exist before, so that the ability to take pictures besides being more accurate also becomes wider dynamic.

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