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Jurnal SImetri Rekayasa
Published by Universitas Harapan Medan
ISSN : 2715890X     EISSN : 27165035     DOI : 10.35447
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering
Dalam Jurnal SIMETRI REKAYASA Membahas mengenai scope: Teknik Sipil Teknik Mesin Teknik Elektro Teknik Industri
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 83 Documents
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Penentuan Jumlah Tenaga Kerja Yang Optimal Berdasarkan Waktu Standar Dengan Metode Work Sampling Di Bagian Penggulungan Di PT. PTPN IV Uun Novalia Harahap; Zaharuddin Zaharuddin; Abdul Azis Syarif; Bagas Sriwanto; Muhammad Rizki Permana
Jurnal Simetri Rekayasa Vol 4 No 1 (2022): Edisi April 2022
Publisher : Universitas Harapan Medan

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Abstract

PTPN IV is a State-Owned Enterprise (BUMN) engaged in the agro-industry business which manages tea commodities covering 4% of the entire plantation business at PT. PTPN IV needs to determine the optimal number of workers at the rolling station, because there is an imbalance between working time and labor so that there are additions or reductions. The purpose of this study is to determine the amount of standard time, productivity and determine the number of workers to be employed at the rolling station based on standard time. Through this research, the company can determine the number of employees needed by the company to complete its work. This research was conducted from 07.00 WIB to 16.00 WIB for operators working in the rolling section to limit the problems in the research. The research took place in several stages, namely preliminary observation and then continued with determining the number of observations, work sampling observations, data collection, data processing, analysis of results, and conclusions from research results. This research was conducted using the work sampling method. This is done by observing the actions of workers while working, which is then used to measure their work productivity. By knowing the productivity of the operator, we get the standard work time and the number of productive hours to complete the job, then use it to calculate the total work time with the total processing of the enumeration from observations and calculations so that the number of workers who should be employed is known.
Pengendalian Persediaan Sparepart Sepeda Motor dengan Menggunakan Material Requirement Planning di CV. Parna Jaya Motor Indrapura Zaharuddin Zaharuddin; Abdul Azis Syarif; Denny Walady Utama; Dimas Pramana Putra; Alfi Dwanda Putra Mulia
Jurnal Simetri Rekayasa Vol 4 No 1 (2022): Edisi April 2022
Publisher : Universitas Harapan Medan

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Abstract

Inventory control is a company policy related to investment and service to consumers. CV. Parna Jaya Motor is a company engaged in the sale and repair of motorcycles. The problems that occur in this company are related to inventory controlspare partsthat causes consumer demand to bespare partsnot fulfilled. To overcome this, the company must be able to control inventoryspare partsso that consumer demand is fulfilled by applying the ABC Analysis method, then calculating the MRP to find out the number of orders (EOQ), order frequency (SS) and when to place an order again (ROP). The results of data processing using the method above obtained results for the ABC classification of 45 speciesspare parts,gotspare partsbelonging to class A consists of 13 speciesspare partswith an investment value of IDR 807,455,000 or 68% of the total investment, class B consists of 12 typesspare partswith an investment value of IDR 250,323,000 or 21% of the total investment and class C consisting of 20 typesspare partswith an investment value of IDR 127,266,000 or 11% of the total investment. Of 13 typesspare partsclass A which is a priority, EOQ results range from 28-293 units, F results range from 7-13 times/year, SS results range from 23-82 units, ROP results range from 95-303 units, and TC results everyspare partsranges from IDR 595,500 – IDR 1,075,200 with all TCspare partsRp. 10,101,900.
PENGGUNAAN OLI BEKAS SEBAGAI BAHAN TAMBAH TERHADAP KARAKTERISTIK MARSHALL PADA DAUR ULANG OLI BEKAS Fadly Ahmad Kurniawan Nasution; Muhammad Arifin
Jurnal Simetri Rekayasa Vol 1 No 2 (2019): Edisi November
Publisher : Universitas Harapan Medan

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Abstract

This study aims to analyze the mechanical properties of areca nut fiber reinforced composites using static bending testing methods. Areca nut fiber reinforced composites are materials that show potential as an attractive alternative in engineering applications and natural fiber-based materials. Static bending testing methods are used to evaluate the modulus of elasticity, tensile strength, flexural strength, and ductility of composites. At the sample preparation stage, areca nut fibers are well arranged in a resin matrix to form a composite sample. The test is performed by applying a load on the midpoint of the sample gradually until a significant fracture or deformation occurs. During the test, the strain, force, and change in shape of the sample are measured. The test results show that areca nut fiber reinforced composites have significant values of modulus of elasticity, tensile strength, flexural strength, and ductility. Factors such as fiber orientation, fiber-matrix composition, and interactions between fibers and matrices can affect the mechanical characteristics of composites. This research provides a better understanding of the mechanical properties of areca nut fiber reinforced composites, which can be used for the development and application of such materials. The results of this study can also be used as a basis for comparison with other fiber-reinforced composites or other materials used in similar applications.
DESAIN DATA AKUISISI BOMB KALORI METER BAHAN BAKAR CAIR Junaidi Junaidi; Fadly Ahmad Kurniawan Nasution
Jurnal Simetri Rekayasa Vol 1 No 2 (2019): Edisi November
Publisher : Universitas Harapan Medan

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Abstract

Bomb calorimeter is related to the measurement of the amount of energy of a material. Energy quantities include thermodynamic properties of systems such as enthalpy, internal energy, specific heat or heating value. Designing tools, data acquisition atmega 328p Performing acquisition data testing on bomb calorimeters, Confirming test data on sugarcane bio-ethanol fuel and pertalite sensors used are max6675 with type K thermocouple readings, 5 volt sensor operating voltage with a temperature reading range of 0.25 degrees at speed of 1 millisecond, data from the sensor is transferred to the micro control with the arduino program, the reading received by the micro control is the voltage. This value is converted into numbers with the help of the C++ program and stored in the ms.excel database with PLX DAQ. In this test, the LHV value for pertalite fuel is higher than bio ethanol. A bomb calorimeter device was developed which consists of a micro controller that functions as a measurement tool. The results of the implementation of the micro controller device on the bomb calorimeter can be said to be effective for use in testing fuel ratios. This effectiveness is seen from the test results. In this test, the HNY value on pertalite is higher than the sugarcane bio-ethanol fuel.
ANALISA SIFAT MEKANIK PADUAN ALUMINIUM SILIKON METAL DENGAN VARIASI CAMPURAN Fadly Ahmad Kurniawan Nasution; Ade Irwan
Jurnal Simetri Rekayasa Vol 1 No 2 (2019): Edisi November
Publisher : Universitas Harapan Medan

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Abstract

when aluminum is exposed to free air. This aluminum oxide layer prevents further oxidation. One way of recycling (recycle) is the smelting process. Where adding Silicon Metal to the Aluminum alloy makes these two alloys strong and light Aluminum-Silicon Metal is cast with 3 ratios namely (92% Al: 8% Si, 90% Al: 10% Si, 88% Al: 12% Si) shaft shape. After finishing casting the specimen is turned with ASTM E8 size followed by tensile testing to get the stress value, strain value and elastic modulus value in the material. The addition of Silicon Metal elements in Aluminum, the tensile strength of Aluminum will be even smaller. Crust/dirt is one of one reason for the decrease in tensile strength. This crust/dirt can also cause defects in the casting specimens. The amount of porosity that occurs in casting aluminum alloys does not only depend on the amount of hydrogen gas absorbed by the metal, but also depends on the speed of solidification of the metal in the mould. From the test results, the average stress value for a mixture of Al 92% - Si 8% is 0.378697366 MPa, a mixture of Al 90% - Si 10% is 0.386266797 Mpa, a mixture of Al 88% - Si 12% is 0.14015392 MPa.
KEKERASAN MATERIAL BAJA KARBON RENDAH DENGAN METODE ROCKWELL Junaidi Junaidi; Din Aswan Ritonga
Jurnal Simetri Rekayasa Vol 1 No 2 (2019): Edisi November
Publisher : Universitas Harapan Medan

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Abstract

The development of technology is now so fast over time to help facilitate activities. The world of machinery has a very important role in the development of technology that exists today, on the one hand as a producer of new existing technology and the other hand as a consumer who needs technology in the production process.This research continues to be carried out to produce new technology with the aim of improving human welfare and making it easier for humans to do something. One way to determine the strength or toughness of a material and as a support for the specifications of a material is to use an impact test. Heat Treatment is one of the processes that play a role in the Manufacturing Industry with the aim of Mantenance Process and Production Process.Therefore in this study will be carried out a hardness test analysis of Low Carbon steel material with the Rockwell Method.
Analisa Uji Kekerasan Akibat Perlakuan Panas Dengan Media Pendingin Dexlite dan Air Pada Baja VCN-150 dan Baja S45C Menggunakan Metode Vickers Junaidi Junaidi; Ade Irwan
Jurnal Simetri Rekayasa Vol 2 No 2 (2020): Edisi Oktober 2020
Publisher : Universitas Harapan Medan

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Abstract

Solar Dexlite for diesel-engined vehicles is able to protect the vehicle's engine properly. Dexlite also has Ecosave Technology which is able to protect the engine from rust so that the engine is better protected and becomes durable and long lasting. VCN 150 steel which is equivalent to AISI AISI 4340 is a type of steel material that is widely used for shafts in conveyor motor rolls. This steel is included in the machinery steel group which is also an alloy steel of Nickel, Chrom and Molybdenum with medium carbon content. This material has good toughness and ductility and has the ability to be hardened so that it is suitable for its designation under the desired operational conditions. However, to increase wear resistance, one way to do this is to increase the hardness of VCN 150. There is a correlation that increasing hardness will increase the wear resistance of a material. One of the efforts made is to carry out a hardening heat treatment process to obtain a martensite structure. The results of the hardness test on S45C carbon steel, the sample raw material is 213 HV, at a cooling rate of quenching is 674 HV, normalizing is 208 HV and annealing is 150 HV. The hardness of steel using the quenching process is higher compared to other cooling rates. Heat treatment of steel samples at a temperature of 850 oC for 30 minutes with different cooling rates gives the effect of changing the microstructure of the steel. The results of microstructure observations before being given heat treatment produced ferrite and pearlite grains and after being subjected to heat treatment with the quenching process produced martensite and cementite grains.
OPTIMASI KINERJA TURBIN PELTON RESPON KEMIRINGAN BUCKET Din Aswan Ritonga; Junaidi Junaidi; Rizky Gunawan
Jurnal Simetri Rekayasa Vol 2 No 2 (2020): Edisi Oktober 2020
Publisher : Universitas Harapan Medan

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Water is a source of energy that can be used as a power plant by utilizing its potential power. Hydroelectric power plant (PLTA) is a technology that has been proven to be environmentally friendly and does not damage the environment. The use of the turbine depends on the potential head it has. As in this case the Pelton turbine which uses the impulse principle requires a fairly high head. This type of turbine works by utilizing falling water or head, flow velocity, blade angle, number of nozzles, flow size and number of blades. Pelton turbine testing with several combinations of parameters including: nozzle diameter, number of nozzles, number of blades, and blade slope. Optimization analysis using Statistical Software. Based on tests or research conducted on Pelton turbines by varying the bucket slope, number of buckets, diameter of nozzles and number of nozzles using the Taguchi method, it can be concluded that the efficiency of the turbine using 2 nozzles that have been managed for maximum turbine efficiency is produced with a power of 460 watts with efficiency of 28%, found at a bucket slope of 80 at a nozzle diameter of 19 mm. While the maximum turbine efficiency is generated with a power of 220 watts at a bucket slope of -80 with a turbine efficiency of 6% at a nozzle diameter of 25 mm. The maximum output power of the Pelton turbine is by testing using 2 nozzles with a water flow of 375 l/minute at a head of 8 m with a power of 490.5 watts. Based on the results of the Pelton Turbine Test Graph using the Taguchi method, the response of the bucket slope with the Maximum Rotation Nozzle Diameter is at -80 Bucket Inclination Producing a Turbine Rotation of 416.7 Rpm with a Nozzle Diameter of 19 mm. Meanwhile, with a maximum power of 80 bucket slope, it produces a turbine load of 405 watts with a diameter of 22 mm.
STUDI KUALITAS PERMUKAAN PEMBUBUTAN KERING PADA BAJA AISI 4340 MENGGUNAKAN PAHAT PVD DAN CVD BERLAPIS Junaidi Junaidi; Yulfitra Yulfitra
Jurnal Simetri Rekayasa Vol 3 No 2 (2021): Edisi Oktober 2021
Publisher : Universitas Harapan Medan

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In order to manufacture a component of high quality, surface quality is the most important requirement for users. An understanding of the chip removal process in metal cutting is essential for material selection and tool design, and also for ensuring consistent dimensional accuracy and surface integrity of the finished product. Friction in metal cutting affects cutting power, machining quality, tool life and production costs. The most important measure of surface quality during the machining process is the average surface roughness (Ra). When the tool wear reaches a certain value, the cutting force, vibration and cutting temperature increase, causing the dimensional error to be larger than the tolerance and the surface integrity to deteriorate. This tool wear is one of the most important aspects of hard turning. Usually abrasion, adhesion and diffusion are considered the main tool wear mechanisms in hard machining. However, the individual effect of each mechanism depends on the tool geometry, tool grade or class, cutting parameters, and workpiece hardness. Tool wear increases linearly with increasing cutting parameters. This indicates that the increased tool wear at higher cutting conditions may be due to abrasion especially at the rake and flank during machining. The selection of dry machining is carried out with environmental efforts to minimize or eliminate the use of cutting fluid waste.
DESAIN KOTAK PENGHANGAT MAKANAN DENGAN MEMANFAATKAN GAS BUANG SEPEDA MOTOR Fadly Ahmad Kurniawan Nasution; Muhammad Arifin
Jurnal Simetri Rekayasa Vol 3 No 2 (2021): Edisi Oktober 2021
Publisher : Universitas Harapan Medan

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Abstract

A warming box is a box that can store food and warm food on delivery services and can keep food warm until it reaches consumers. The system in this food heating box uses the principle of pipe heat to deliver heat coming from motorcycle exhaust gases to the food storage box on the delivery service. In the design of the food warming box, there are several layers in the box, including a layer of stainless stell plate, cocopeat insulator layer, aluminum layer, fiber layer. This food warming box has dimensions of 400 mm× 400 mm× 465 mm, from the design obtained the result of the design of the storage box in the form of the inner surface area of the storage box of 3832.9 〖cm〗^2 at each level. In this food warmer box, a heat exchanger is also used as a heat transfer device and has dimensions of 400 mm× 300 mm×100 mm.

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