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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
Mechanical properties analysison FSW butt joint of aluminum alloy that applied in marine industries Rahadian Nopriantoko
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.v20i2.3062

Abstract

 Friction Stir Welding (FSW) was promoted as a new welding method, cheap and eco-friendly welding with good quality joints. Aluminum Alloy is used widely in industries, including the marine industry. AA 5XXX and 6XXX series are materials used for shipping manufacture and offshore construction, because of their corrosive resistance and good strength properties after joining. Similar butt joint welding using the FSW method for a number of aluminum alloy series AA 5052, AA 5083, AA 6061, AA 6063. Welding samples were made using AWS standards and then given radiographic testing to determine the general condition of the welds. Then a tensile strength test was carried out using a ZwickRoell tensile testing machine and a hardness test using a microhardness Vickers Buehler with ASTM standards on the welding results to analyze the mechanical properties of the welded joint zone, as well as compare each result and get the ratio of the number of mechanical properties of the joint results the weld to the base material. After that, the results and discussion were obtained that the weld area showed different mechanical properties for each series of aluminum alloys. The value of the tensile strength, when compared to the tensile strength of the base metal, is around 60-75%, while the hardness value is around 75-80.6 HV for all the welded samples.  
Kajian Teknis Kapasitas Produksi dan Efisiensi Kerja Conveyer Belt Dalam Pengiriman Batubara Menuju Stockpile Di PT. Singlurus Pratama Faisal Manta; Reza Naufal Hanifudin
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.v20i2.2529

Abstract

PT. Singlurus Pratama has a fairly high mining productivity, so a stockpile is needed as a temporary coal storage place. Stockpile owned by PT. Singlurus Pratama has a capacity of 140,000 tons. The crushed coal is carried by a conveyor belt to be transported to the stockpile. Conveyor belt at PT. Singlurus Pratama has different sizes so that the efficiency of each belt for transporting coal varies. In the next planning, an increase in production targets will be carried out, so research is urgently needed on the efficiency value of each type of belt owned. This data is needed to determine the type of belt that is in accordance with the production target so as to provide optimal conveyor belt service life performance. Efficiency calculation begins by measuring the value of the theoretical and actual production capacity of each type of belt to get the value of the production rate index (PRI). PRI is the value of work efficiency based on two load conditions, namely minimum and maximum, then the value of work efficiency for all types of belts at PT. Singlurus Primary is known accurately. In the study, it was found out that the production capacity of conveyor belts in coal delivery to the stockpile for type BC-01, BC-02, BC-03 and Tripper Cars were 1,690, 1,698, 1,742, 2,371 tons/hour, with the lowest value for type BC-01. and the highest value of the Tripper Car type. The minimum load efficiency values for the conveyor belt types BC-01, BC-02, BC-03 and Tripper Car are 22.2, 22%, 22% and 16%, respectively. The maximum load efficiency values for the conveyor belt types BC-01, BC-02, BC-03 and Tripper Car are 37%, 37%, 36% and 26%, respectively. Then the minimum and maximum workload efficiency values are the highest on the BC-01 type and the lowest on the Tripper car type.
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.
Optimization of electroplating thickness results for SS400 steel using the Taguchi method Ahmad Adib Rosyadi; Firman Gustiawan; Mahros Darsin; Yuni Hermawan; Mochamad Asrofi
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.v20i2.2860

Abstract

SS400 steel is steel with a low carbon content (max 0.17 %C) or low carbon steel. SS400 applications are widely used in the construction industry, railway industry, bridges and others. The use of SS400 which is in direct contact with the surrounding environment will cause the appearance, quality, and usefulness of the material or material to decrease. One way to prevent and improve metal performance is electroplating. This study used SS400 carbon steel with chrome coating. The parameters in this study are a voltage of 3, 6, and 9 Volts; the temperature of 45, 50, and 55 oC; and the time of 20, 25, and 30 minutes. The Taguchi method L9(33) was used to design the experiments. Analysis of variance (ANOVA) shows that factors of chroming time, voltage, and temperature contribute to coating thickness at the level of 40.615%; 24.951%; and 10.369%, respectively. The maximum thickness of 47.340 µm could be achieved when using combination factors of plating time of 30 minutes, at 9 Volts, and keeping the temperature of the solution at 50 oC.
The effect of solar tracker movement on the thermal performance of solar cooker using the Fresnel lens solar concentrator Asrori Asrori; Sugeng Hadi Susilo; Kris Witono; Putu Wijaya Sunu
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.v20i2.2652

Abstract

Solar energy as renewable energy has great potential to supply the world's energy needs. Solar thermal energy can be used for domestic energy purposes (cooking and water heating). The purpose of this research is to develop, design and analyze the performance of a solar cooker from the concentration of direct normal irradiance (DNI) by the Fresnel lens on the receiver/absorber as a cooking vessel. One form of improving the performance of the Fresnel solar concentrator (FSC) is the addition of an automatic solar tracker installation using hydraulic actuators. The solar tracker is varied, every 5 and 10 minutes, respectively. The solar cooker performance test was conducted outdoors at the Mechanical Engineering Department of State Polytechnic of Malang (7.9553 oS and 112.6125 oE) in April 2021. The method used actual experimental research. The measurement of solar radiation uses a solar power meter SPM-1116SD and the tracker's movement. At the same time, the temperature parameters (water temperature, receiver wall temperature, focal point temperature, ambient temperature) are measured by the temperature data logger. The concentrated solar cooker type design uses a fresnel lens with a capture area of 0.785 m2 and a focal ratio of 0.88. The main components of this solar cooker design consist of: a large fresnel lens that functions as a concentrator of sunrays, a cone-shaped cooking stove as a solar collector (receiver), and a hydraulic actuator-type solar tracker unit. Initial tests showed that the solar radiation, In = 789.00 W/m2, obtained the focal point temperature at the receiver, Tf = 930.10°C. Meanwhile, the thermal efficiency (Th) of a solar cooker with a solar tracker that moves every 10 minutes and 5 minutes is 12.7% and 33.66%, respectively. The increase in the thermal efficiency of the solar cooker is very significant, which is 2.65 times. This shows that the more accurate and continuous movement of the tracker will increase the thermal efficiency of the designed Fresnel solar cooker.
Experimental investigation of tool wear TiAlN(Al2O3)/TiN-coated carbide in the cam-shaft turning process arfan halim
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.v20i2.2962

Abstract

This research carried out experimental tests to determine the tool life and wear of Titanium Aluminum Nitride and Titanium Nitride-coated carbide tools (TiAlN/Al2O3 TiN) during the hard facing process of cam shaft material turning. The results of this study will be used as a parameter for selecting carbide cutting tools in Teaching Factory (TEFA) activities. In the cutting process, the parameters used are VC = 36,74 m/min, f = 0,52 mm/rev, a = 0,2 mm, t = 460 min; and the cutting conditions are wet turning. The results showed that the TiAlN/ Al2O3-coated carbide tool experienced tool wear at the 100th minute with a VB value of 0,33 mm, while the TiN-coated carbide tool experienced tool wear at the 200th minute with a VB value of 0,30 mm. Theoretically, tool life for turning process conditions was analysed by graphical method in order to obtain the Taylor equation for TiAlN/Al2O3 coated carbide tools with an exponent value of n = 0,8 and a CT constant = 1.462,65 so that the Taylor tool life equation is V.Tn = CT ↔ V.T0,8 = 1.462,65. The results of the TiN carbide tool life test showed that the exponent n = 0,6 and CT constant = 882,59 so that the Taylor tool life equation is V.Tn = CT ↔ V.T0,6 = 882,59. Failure of TiAlN/Al2O3 and TiN-coated carbide tools on hard-processed cam shaft material cutting to face edge wear (VB), crater wear (KA), peeling of the tool material layer, and formation of built-up edge (BUE). The experimental test results of TiAlN/Al2O3 and TiN-coated carbide tools on the cutting of cam shaft material using a hard facing process show TiN carbide tools have a longer tool life than TiAlN/Al2O3, so they are recommended for Teaching Factory (TEFA) activities at Simas Berau Polytechnic
Peningkatan Efisiensi Kerja Dengan Penerapan Digital Standard Operating Procedure (SOP) Pada Proses Manufaktur (Studi Kasus: Mesin Bubut Konvensional) Irvando Anto Verry Damanik
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.v20i2.2670

Abstract

The development of the use of digital-based technology has become a challenge as well as an opportunity in Industry 4.0 era, especially in the manufacturing industry. The machining process is one of the important and dominant part in the implementation of the manufacturing industry, so it is necessary to find a way to get the expected results with time efficiency in the process because it will be a factor that determines the total operating costs incurred. To optimize all used resources and minimize engine idle time, the Digital Standard Operating Procedure (DSOP) method is a solution. DSOP is one step in digital transformation in order to optimize guidelines for the implementation of the machining process which also replaces working papers as operator guidance on the production floor. The method is used to compare the time required by the operator in carrying out the machining process using the DSOP with the old method. From the day of observation, it was found that there was a time saving of up to 50% by the operator, compared to conventional machining process methods. Digital SOP also provides a more communicative guide accompanied by complete pictures of the products made, as well as videos on how to set-up tools and workpieces on machines. With the use of digital-based SOPs, the time required for operators is shortened and SOP is understood more accurately from planning, monitoring until implementing, which are presented digitally
Identification of Mothballed and Retired Units of Reliability-Based Steam Power Generation Systems M Sabri
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.v20i2.2598

Abstract

A steam power generation system is a power generation system that uses steam power. The generating system itself has two types of unit statuses, namely active and inactive, which in this case are subdivided into Mothballed and Retired Unit statuses. The status of the unit provides a statement or decides whether the generating system is still suitable for use or has to be replaced (inactive). Determination of the status of the unit in the steam power generation system is carried out by calculating the work reliability of the generating unit. This is done to get the maximum decision. If you set the unit status incorrectly, the production costs incurred will be greater and not proportional to the number of products produced. This study focuses on two power generation units that have been used for a long time and experienced a decrease in performance. Therefore, identification of the status of the Mothballed and Retired Units of the steam power generation system was carried out by using a reliability test so as to produce a decision in determining the status of a more reliable unit. The method used to determine the status of the unit is to use the Reliability Block Diagram (RBD) and the Generating Availability Data System (GADS), the results of which state that unit one is in Mothballed status, which means the unit is no longer active but can still be used or reactivated within a period of several months. with a reliability level of 4.92% if it operates for 800 hours or a month. Meanwhile, unit two is declared to have the status of Retired Unit or can no longer be used again.
Study on the Use of On-Grid Rooftop Solar Power Plants in Helping to Reduce Electrical Energy Consumption at LPI. Dayah Ulee Titi Foundation Teuku Zulfadli
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.v20i2.3068

Abstract

Solar power plant is a generator that converts solar energy into electrical energy through solar module media. The utilization of solar energy is very volatile to changes in the weather, causing the production of electrical energy to be disrupted or not optimal. For that, we need a system that can maximise energy from solar modules, namely the on-grid rooftop solar power plants system with State Electricity Company (PLN) network. Currently, on-grid rooftop solar power plants has been widely used, one of which is the Islamic Education Institute (LPI) of the Dayah Ulee Titi Foundation. The on-grid rooftop solar power plants at Dayah Ulee Titi is assisted by the Ministry of Energy and Mineral Resources (ESDM) and has been operating since January 2020. However, based on electricity account data from January 2020 to March 2021, it has not shown a significant decrease in the value of the monthly electricity bill. Its export kWh is still very low. This study aims to determine the cause of the non-maximum power supply and the use of the Rooftop solar power plant in Dayah Ulee Titi. The benefit of this research is to reduce the electricity consumption cost in Dayah Ulee Titi so that it can help reduce its operational costs. As a result, the tilt angle of the solar panels installed on Dayah Ulee Titi is considered very suitable and efficient, which is 32.60. The measurement results using the Automatic Meter Reading (AMR) kWh meter in June 2021 found that the total value of export kWh was 6533.26 kWh, while the total imported kWh value from solar power plant to PLN was 44.13 kWh. From May s.d. To September 2021, the Rooftop solar power plant at Dayah Ulee Titi can produce an average of 1246.3 kWh of electrical energy so that it can reduce electricity consumption (kWh savings) from PLN by an average of 25.2%.
Seasoning Funnels Die Design for Autopacking Machine Distributors Using SUS 316 Material Jatira Jatira; Amri Abdulah; Sukarman Sukarman; Apang Djafar Shieddique; Dede Ardi Rajab; Satria Prayoga
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.v20i2.2895

Abstract

This article discussed the design of dies and punches using SUS 316 material for seasoning funnel (SF) applications in the food industry. Cracks in the welding zone in the seasoning funnel (SF) result in leakage of seasonings and result in product mass, which is one of the main parameters in the food industry and a minimum. The damage location on the SF is identical, on the sides of the SF around the bolt holes. The movement of the spice powder, which rotates at high speed, produces a centrifugal force and is then transferred through the SF. The metal structure is becoming increasingly coarser in the area adjacent to the weld melting line. An additional punch with a knocking arm delivers to the SF to expedite the transfer. The knocking arm caused the SF fracture on the SF. SUS 316 sheet metal material for SF without welding is thought to reduce weld damage and speed up the procurement process. The input design for attempting to make dies has been correctly selected as SUS 316 material thickness of 1.0 mm. The two main processes required to form SF from sheet metal were blanking and bending. The SKD-11 material was selected carefully for the main components of the dies and punch. Supporting components such as shank, shaft, top plate, and bottom plate are determined using St 60 material. St 37 material determines the stripper, punch holder, and stopper components. Based on theoretical calculations, the blanking force should be about 225.5 kN. To minimize the burr in the blanking process, dies and punch allowances of 0.1 mm were chosen. The minimum required bending force calculation was 39 kN. A material factor spring back value of 0.98 was selected correctly to achieve the desired bending angle. The simultaneous blanking and bending processes necessitated using a 72.96-tonne power press machine.

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