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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
Mechanical Engineering - Energy Conversion Engineering - Material Engineering - Manufacturing Technology - Mechatronics - Machine and Mechanism Design - Biomechanics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 13 Documents
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Search results for , issue "Vol 21, No 6 (2023): December" : 13 Documents clear
Impact of welding steel rod rotor bars on ripple mill efficiency and cost-effectiveness at Sumatera Jaya Agro Lestari Sawit Coconut Plant Lubis, Sudirman; Pane, Rafsanzani; Siregar, Irpansyah
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4507

Abstract

PT. Sumatera Jaya Agro Lestari is an industry that is moving in the field of Coke Processing, some long processes that include Loading Ramp, Sterilizer,Trheser, Digester, Pressing, Clarification, and Kernel Plant stations, some problems that occur in the kernel stations mainly to Efficiency results on the Ripple Mill machine, not out of the Operation and Maintenance Standards performed by Using the achievement of the target of the Cernel by the efficiency standard of 96%, on Ripple mill machines often occur cworn outes on Stell Rod due to the input of the ripple Mill Too Over Load, and the amount of nut less mature, for that was done a study on Stel Rod that has already Worn out by performing the Rewelding Method, i.e. the addition of the meat of the steel Rod to 5 mm of the surface of the Rotor-Disc to obtain the maximum Effectiveness result. The steel rod is the most important part of the mill ripple machine consisting of stone mills that move automatically so that it will not reach the maximum efficiency result at mill mills ripple rod. With the welding method, the surface of the welded meat is applied to a steel rod with a thickness of 5mm to 7mm using the MWH 500 type electrode to form the return of the base of the new steel rods surface where the strength of the electrodes and the formation of the surface are correct. The results can be inferred from the efficiency of the impact of welding steel Rod averages 93.38% achieving a very high efficiency.
A study of co-firing palm kernel shell on the Nagan Raya coal-fired power plant Ansar, Khairil; Syuhada, Ahmad; Sofyan, Sarwo Edhy
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4021

Abstract

Co-firing biomass with coal in existing utility boilers is seen as one strategy for promoting renewable energy with low upfront costs and little to no impact on the boilers' high efficiency. The purpose of this research is to analyse the fuel characteristics and performance of palm kernel shell co-firing at Nagan Raya Coal-Fired Power Plant (CFPP) at various percentages of palm kernel shell combination. The analysis is conducted based on the operational data obtained from Nagan Raya Power Plant. In this study, the characteristics of fuel and the performance of a power plant are analysed based on percentages of fuel variations, namely 100% coal, 95% coal-5% palm kernel shell, and 90% coal-10% palm kernel shell. The results reveal that co-firing's biomass ratio boosted operation parameters, including main steam pressure, temperature, and flow rate. Subsequently, co-firing with 90% coal-10% palm kernel shell has enhanced the power plant output to 90,7 MW compared to those with 100% coal, 95% coal-5% palm kernel shell, namely 89,3 MW and 90,4 MW, respectively
Enhancing mechanical properties of waste expanded polystyrene composites through varied coupling agents and wood powder formulations Budiyantoro, Cahyo; Yudhanto, Ferriawan
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4234

Abstract

This study investigates Wood Plastic Composites (WPCs) by incorporating waste Expanded Polystyrene (EPS) and various wood powder reinforcements. The mechanical properties of WPCs play a pivotal role in sustainable material development. Our research delves into the effects of different treatments on wood powders and their interactions with the polymer matrix.Pine, teak, and silk tree wood powders underwent alkali immersion and coupling agent treatments. The ensuing composites underwent rigorous testing, including flexural strength, hardness, and impact resistance assessments.The findings underline the complex factors governing WPC mechanical properties. Pine-based WPCs, reinforced with pine wood powder and subjected to alkali treatment, exhibited the highest flexural strength at 29.56 MPa, whereas the lowest flexural strength of 14.65 MPa was observed in WPCs reinforced with alkali-treated teak wood powder. The highest impact strength quantified at 2.54 kJ/cm², was found in untreated pine wood powder-based WPC. In contrast, the lowest impact strength was identified in teak wood powder-based WPC treated with alkali.
Comparative study of performance of temiki (Melastomacandidum) and rubek (Calotropis gigantea) extract inhibitors for carbon steel in corrosive media Supardi, Joli; Rizal, Samsul; Ali, Nurdin; Fonna, Syarizal; Ikramullah, Ikramullah; Veranita, Veranita; Arifin, A.K.
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4577

Abstract

The use of synthetic inhibitors that negatively affect the environment is still used. Organic inhibitors are the best and most environmentally friendly solutions such as Temiki plants (MelastomaCandidum) and Rubik (Calotropis Giganteen) which have good corrosion cell inhibitor properties and have the potential to be used as corrosion inhibitors. This study analyzed Temiki and Rubik extracts as corrosion inhibitors in carbon steel using the weight loss method in 3.5% NaCl solution and analyzed the efficiency of the inhibitors. Temiki and Rubik's are extracted by drying the leaves, stems and flowers under the sun. Then the material is mashed together and distilled by the solid-liquid method with the Soxhlet tool. Identification of plant components using Gas Chromatography-Mass Spectrometry (GC-MS). Density and viscosity were analyzed following ASTM D 4052 and ASTM D 445 standards. Weight loss method testing was carried out at inhibitor concentrations of 200, 300, 400 and 500 ppm, with soaking time for 15 weeks and data collection was carried out every week. The results of the analysis showed the highest corrosion rate in Temiki extract with a concentration of 500 ppm reaching 1,569 mpy and the lowest at a concentration of 500 ppm reaching 0.157 mpy. In Rubik's extract inhibitors, the highest corrosion rate occurred in 500 ppm inhibitors reaching 1,268 mpy, while the lowest occurred at 200 ppm concentrations reaching 0.331 mpy. The highest efficiency value is the 400 ppm Temiki inhibitor with efficiency reaching 82.89% and the lowest at 500 ppm reaching 19.55%. while for the efficiency of Rubik's extract inhibitors, the highest value was 62.71%, at a concentration of 200 ppm. While the lowest is 28.40%, at 500 ppm inhibitors. These results show that Temiki and Rubik's extracts can still function well as corrosion inhibitors in low-carbon steels in NaCl solution.
Effect of Speed and Turning Time Pulley on the Quantity and Quality of Output Multipurpose Chopper Machine Sari, Kartika; Sunardi, Sunardi; muwaffaq, Abiyyu Sayyid; Aminuddin, Jamrud; Khoryanton, Ampala; Warso, Warso; Budi Utomo, Agung Bambang
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4098

Abstract

Variation of pulley rotational speed on the yield and cut of the multipurpose chopper aims to determine the optimum quality and quantity of chopping results. Testing using cassava and bananas. The diameter of the pulley used is 2 inches and the driven pulley is 6, 7, and 10 inches with a pulley speed of 467, 400, and 275 rpm. The result of bananas shows that the average chopping was 573, 864, and 864 grams, respectively with the spin pulley time being 46, 90, and 59 seconds. Meanwhile, for cassava, the results of chopping were 984, 995, and 823 grams, respectively with the spin pulley time being 23, 59, and 35 seconds, respectively. The optimum chopping quality for bananas used a pulley diameter of 10 inches and an optimum rotation time was 59 seconds. The optimum slicing quality for cassava uses a pulley diameter of 7 inches with an optimum rotation time was 59 seconds. The conclusion is that the diameter of the pulley affects the thickness of the sample, the time and speed of the pulley rotation, and the quality of the chopping results.
Weight optimization of 200 mm diameter rocket motor tube using finite element method Wibawa, Lasinta Ari Nendra; Daryana, Alit; Saparudin, Parid; Indrayana, Wan Dedy Fitrah; Handriyana, Handriyana; Diana, Asep; Sobirin, Toris
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4142

Abstract

The lightweight design of the rocket motor tube is a critical requirement for enhancing the rocket's flight performance. This study assesses the impact of wall thickness, cap thickness, and fillet radius on structural strength and the optimization of rocket motor tube weight using the finite element method with the assistance of Ansys software. A total of 12 finite element model variations, utilizing Aluminium 6061-T6, were developed and subjected to a uniform internal operating pressure load of 10 MPa. The design includes wall thickness variations of 8 and 10 mm, cap thickness options of 25 and 30 mm, and fillet radius dimensions of 20, 25, and 30 mm, allowing for a comprehensive comparison to achieve the required minimum safety factor while minimizing structural weight. The research concludes that increasing the fillet radius is a more recommended approach compared to increasing wall thickness and cap thickness. The results indicate that Model 9, with wall thickness, cap thickness, and fillet radius dimensions of 10 mm, 25 mm, and 30 mm, respectively, is the optimal choice due to its lightweight construction.
Influence of Indium Tin Oxide (ITO) poling temperature in vacuum on surface roughness of Polyvinylidene Fluoride(PVDF) film Suprapto, Suprapto; Lisyanto, Lisyanto; Eswanto, Eswanto; Riadi, Selamat; Gunawan, Safri; Iskandar, Henry; Jubaidah, Jubaidah; Muhtadin, Muhtadin
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4454

Abstract

The surface roughness is a significant parameter of the performance of PVDF thin film sensors. In this work, we have investigated the effect of ITO poling in vacuum at various temperature on the surface roughness of uniaxially stretched PVDF film. The influence of poling temperature on the surface roughness of PVDF film was examined using atomic force microscopy (AFM). In this work, the AFM data are obtained through the database, and topography is analyzed using Gwydion Software (GS). GS has characterized surface roughness in terms of Average Roughness (Ra), Root Mean Square (Rrms), and Arithmetic average height (Rz). The results show that the GS can detect and measure profile thickness and roughness on a nanoscale with reliable accuracy. The results confirm that the increased poling temperature can reduce the roughness of the surface.
Performance test of small fishing vessel refrigeration machine for fish storage Siahaan, Juniawan Preston; Yaqin, Rizqi Ilmal; Demeianto, Bobby; Tumpu, Mula; Abrori, Muhammad Zaki Latif; Priharanto, Yuniar Endri; Pradana, Syahrul
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4165

Abstract

The refrigeration system in the fishing process is important for maintaining the quality of the catch. However, the design of small-scale refrigeration machines is still not common, so it is an interesting study. Therefore, this study aimed to evaluate the design of small-scale fishing vessel refrigeration machines. Field studies are needed in machine manufacturing to observe the components required to match the refrigeration machine components onboard fishing vessels. This uses a direct observation method to determine the components of the refrigeration machine on the ship. Furthermore, the performance of the machines produced will be tested through the load cooling process. Parameters determined in the performance test include monitoring temperature (suction and discharge), pressure (suction and discharge), evaporator temperature, load temperature, COP (Coefficient of Performance), and compressor power. Refrigerant temperature measurement uses an insulative principle so that ambient temperature does not affect it. The result is that the machine produced has a capacity of 35 l or 15 kg of load. Meanwhile, in the performance test, the COP and electrical power generated while cooling the load for approximately 4 hours were 2,42 and 507 W, respectively. The results of this design were successful and did not experience failure. The significanceof this study can be used as a reference source for making cooling machines for storing the catch of small-scale fishermen.
The effect of activated carbon granules and KOH solution on welding particulates and gases in air filtration Hardita, Dwi; Wirawan, Wirawan
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4610

Abstract

Hazard Identification Risk Assessment Risk Control (HIRARC) is the process of identifying hazards that can occur in routine or non-routine activities in a company or workplace, then carrying out a risk assessment of these hazards.And from the risk assessment, the hazards in the welding workshop that have a moderate risk and are interesting for researchers to innovate are from sources of danger caused by smoke resulting from welding activities, causing workers to experience respiratory problems and eye irritation. Researchers created a smoke filtration device generated from welding with a system where the welding smoke is channeled into the KOH solution to reduce the number of air particles and reduce the levels of toxic substances in the welding smoke, then to keep the KOH solution always clean, a circulation system was created through the carbon to removes dirt and keeps the solution water from being dirty and colorless.Once all the tools are ready, measurements can be made to measure several chemical elements in the welding smoke from the point before it enters the filter and after going through the filtration process. Among the elements measured are Carbon Dioxide (CO 2), Carbon Monoxide (CO), Particulate PM 2.5 (2.5 Microns), and Particulate PM 10 (10 Microns). Based on research and data testing carried out using the Anova Test and Fisher Pairwise Comparisons, it can be concluded that to produce the best and cleanest air results, the composition is K4 C1 or KOH 10% with Cabon Active 2-3 Mesh. Because if activated carbon with a mesh size larger than 2-3 mesh will affect the quality of the KOH solution because the granules are too small and contaminate the KOH solution. And the higher the KOH solution level, the more effective it is at reducing the dangerous elements in welding fumes. 
Melinjo fruit outer skin peeler prototype design using grate roller based-on auto reverse movement control Yunidar Yunidar; Riska Sufina; Alfa Tirta Mufti; Melinda Melinda; Iskandar Hasanuddin
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4160

Abstract

Cracker snacks made from melinjo fruit are often found in the Pidie Regency area, Aceh. However, processing melinjo seeds into crackers is still manual and takes a long time. In this research, a melinjo peeling machine will be designed to speed up the production process of melinjo crackers. This peeler uses two different electricity sources so it can work in two conditions, namely the PLN electricity supply is on or off. The research method was carried out by collecting data from device testing results and field observations as well as comparing test results with previous research. The movement of the motor is controlled using Time Delay which gives a command to activate the relay and then turns on the 12 V DC motor. The motor rotates clockwise and anti-clockwise continuously (auto reverse) according to the direction of positive and negative potential which is controlled by the relay and Time Delay. The success rate of peeling the outer skin of melinjo seeds using the proposed tool is divided into three types based on differences in seed skin color. The percentage of success for red, orange, and yellowish green melinjo was 68.67%, 51.52% and 25.61% respectively. Thus, in this study, it can be concluded that the most efficient success rate is for red melinjo

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