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METAL : Jurnal Sistem Mekanik dan Termal
Published by Universitas Andalas
ISSN : 25981137     EISSN : 25974483     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
METAL: Jurnal Sistem Mekanik dan Termal translated as METAL: Journal of Systems in Mechanical and Thermal is a scholarly peer-reviewed journal published by Mechanical Engineering Department of Engineering Faculty at Universitas Andalas, Padang, Indonesia. The journal focused on the mechanics and thermal aspects of the mechanical engineering area, and accepted articles are in these subjects: Energy - Renewable energy - Green industry - Energy conversion Mechanical System Engineering - Solid body mechanics - Machine construction - Vibration and control - Mechatronics - Tribology Production System Manufacturing engineering - Product design and development - Production technology - Production logistics and transportation Materials Engineering - Material technology - Nanotechnology
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 100 Documents
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The Effect of Additional TiO2 Nanofluid on Heat Transfer Rate and Thermal Resistance on Processor Cooling with Ultrasonic Vibration Dhiya'ul Ro'id Alfaris; Sudarmadji Sudarmadji
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 2 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.6.2.117-125.2022

Abstract

The cooling system is very important for cooling the processor to keep it at working temperature. According to Moore's law, the processor doubles every 24 months. This has an impact on the power consumed by the processor will increase, along with increasing power, the heat emission generated will also increase. So a water cooling system is needed to overcome these problems in the future. The addition of nanofluid to the cooling medium and the provision of ultrasonic vibration treatment are expected to maximize cooling performance. The purpose of this study was to determine the effect of the addition of TiO2 nanofluid and ultrasonic vibration on the overall heat transfer coefficient and thermal resistance, and then compare them with conditions without vibration. The method used is an experimental method with various concentrations of TiO2 nanofluid 0.1%, 0.15%, and 0.2%. The power consumed by the processor is simulated using a heater with variations of 150W, 200W, and 250W. An ultrasonic transducer is added to the radiator to provide a vibration frequency of 40 KHz. The result of this research shows that the U value of aquadest bottom fluid with vibration increases from 2834.563579 W/m2.oC becomes 3283.473891 W/m2.oC or 15.84%. Nanofluid TiO2 0,1% with vibration increased from 3419.874768 W/m2.oC to 4109.319539 W/m2.oC or 20.16% The effect of nanofluid concentration increased from 4029.871937 W/m2.oC becomes 5534.745283 W/m2.oC or 37.34% and the Rth value of aquadest base fluid with vibration decreased from 0.1588 oC/W to 0.1508 oC/W by 4.99%. Nanofluid TiO2 0,15%with vibration decreased from 0.0895 oC/W to 0.0813 oC/W or 9.22%. The effect of nanofluid concentration decreased from 0.11275 oC/W to 0.073 oC/W or 35.25%.
Design and Manufacture Indirect Method Grain Bed Dryer with 10 Kg Capacity Fueled by Wasted Oil Rizki Cakrawiguna; Noviyanti Nughraha; Nuha Desi Anggraeni
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 2 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.6.2.89-94.2022

Abstract

Artificial grain dryers use additional heat to dry the grain, the energy source for this machine is fuel, gas, husks, and firewood. The dryer used in this study uses wasted oil with the indirect method. This grain dryer with wasted oil helps us make the environment stay clean. The purpose of this research is to design and manufacture a bed dryer type grain dryer with a capacity of 10 kg fueled by wasted oil, with the target of drying grain to a moisture content of 13-14%, dry grain is odorless, the drying cost is relatively cheap because it uses used lubricating oil. The machine is made by the selected design. Including bed dryer, plenum chamber, hot air duct, heater box, stove, oil reservoir, and oil line. The results of the design and manufacture obtained bed dryer dimensions and plenum space 120x50x100cm, a cylindrical stove with a diameter of 20cm and a height of 20cm which is connected by a channel to an oil reservoir with a maximum capacity of 30 liters. This tool succeeded in drying grain from 30% and 38% to 13% moisture. Heating uses indirect or indirect methods so that the air that heats the grain does not contain oil. The heated grain is clean and does not smell of oil
Mold Strength Analysis of Press Machine Composite Brake Using FEM Method on Train Brakes Andhika Muhammad Kasyafa; Muhamad Juan Raffindo; Nuha Desi Anggraeni
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 2 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.6.2.126-131.2022

Abstract

Press machine is a mechanism that works by compressing objects. It is powered by hydraulic machines, electric motors, or human power. Usually in the railway industry, presses are used in the manufacture of composite brake pads for railways. This study was conducted to find out how strong the mold of the composite brake press machine is if given the maximum load by hydraulics, this study also analyzes the mold of the press machine which plays an important role in the manufacture of composite brake linings using the Finite Element Methods (FEM). Therefore, the mold of the press must have sturdy characteristics and can withstand a lot of loads so that the structure will not deform while the process is in progress. The conclusion is that the maximum voltage amount in the mold is 33,596,928 N/m2 (using ASTM A36 as the reference material) which does not cause major deformation of the mold and is still considered safe.
Addition of Zirconium Oxide for Reduction of Hydroxyapatite Layer Cracks in Ti-6Al-4V ELI Implant Materials for Improved Osseointegration Sanny Ardhy; Gunawarman Gunawarman; Jon Affi; Yuli Yetri
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 2 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.6.2.95-101.2022

Abstract

The hydroxyapatite (HA) layer on the surface of the implant material tends to crack during the sintering process for layer densification. This causes the process of implant union with bone (osseointegration) does not function perfectly in the human body. This study aims to reduce cracking by increasing the adhesion of the HA layer on the surface of the Ti-6Al-4V Extra Low Intertitial (ELI) implant material. The research used the dip coating method to get a thin and even layer. To strengthen the adhesion of the coating, Zirconium Oxide (ZrO2) was added in commercial HA suspension. The test specimens were heated at sintering temperatures of 800 0C, 900 0C and 950 0C with a heating rate of 5 0C /minute. Layer morphology and cracks were seen using an optical microscope. The percentage of layer cracks will be measured using ImageJ software. The results obtained, the addition of ZrO2 can reduce cracks in the HA layer of the surface of the test specimen. The percentage of cracks decrease with the addition of ZrO2 (17% and 20% weight) to the suspension of the HA layer. These result is certainly good for increasing osseointegration in the human body.
New and Renewable Energy Optimization to Meet North Sumatera Province’s Energy Share and Emission Road Map Period Year of 2022-2025 by Using LEAP Dedi Khairunas; Hadiyanto Hadiyanto; Sri Widodo Agung Sueda
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.1-14.2023

Abstract

The objective of this work is to evaluate the long-term energy demand and supply in North Sumatera Province. The Road Map for both NRE energy shares and GHG Emissions in North Sumatera is in Regional Regulation No. 4 Year 2022. The growth of electricity demand, type of power generation determination and transmission/distribution losses will be defined into two main scenarios: Business As Usual (BAU) and Policy (KEB), and eight sub scenarios to assess possibilities to reach the Road Map during period of 2022-2050. Four scenarios under BAU Scenario show that the percentage of NRE energy shares and GHG Emissions are achievable during period of 2022-2025. The range of NRE shares is 45.1% up to 96.2%, and GHG Emissions production range is 3% - 30% from the Road Map. Meanwhile, Four scenarios under KEB Scenario show that the percentage of NRE energy shares and GHG Emissions are achievable during period of 2022-2025. The range of NRE shares is 44% up to 93.4%, and GHG Emissions production range is 4% - 30% from the Road Map. Some scenarios under BAU gives slightly higher NRE shares and GHG Emissions production saving since the higher growth of demand in BAU Scenarios is possible for more NRE power generation capacity in operation.
Static Analysis of Tubular Space Frame Chassis of an Electric Racing Car Made of ASTM A106 Grade B Encu Saefudin; Nuha Desi Anggraeni; Marsono Marsono; Syauqi Azhari
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.15-22.2023

Abstract

The chassis is a vital component in electric vehicles, which can keep the car rigid and robust to support the load on it. In this research, the chassis is designed for electric vehicles with sufficient strength and rigidity, as well as light in weight and safety according to KMLI regulations, to be used in student racing competitions. The design process is begun with chassis space frame determination and weight and position definition of all components to be installed on the chassis. Then calculate the centre of gravity and the reaction force at the mounting supports on each wheel. The chassis design has a length of 2300mm, a width of 1100mm and a height of 1100 mm. This chassis is made using ASTM A106 Grade B steel pipe with a diameter of 1 inch, and the total weight is 76.5 kg. The analysis was carried out statically using Solidwork. The static study showed maximum stress of 22.06 MPa, a maximum deflection of 0.346 mm, and a minimum safety factor of 10.9. All the parameters show promising results, strength, stiffness, and safety in compliance with KMLI regulations
Finite Element Method Analysis in Simulation of Induction Heater Using Helical Coil Method Lenny Iryani; Adolf S
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.23-26.2023

Abstract

The problem of corrosion is very common in aircraft structure. This phenomenon is happened because of the two different types of material are in contact under moist or water. Along the operational hours of the aircraft structure, this corrosion is identified during the maintenance activity. To study about the corrosion removal by using the helical coil method, in this research the simulation of the removal corrosion in bolt and nut joint are conducted. The aim of the analysis i.e., to get the optimum electric current and frequency for induction heaters to heat stainless steel nuts that cannot be open, or the threads are stuck. The study was carried out so that the stainless-steel nuts reached a temperature of 400°C in one minute. Several variations of the electric current are carried out with magnitudes, namely 30 A, 40 A, 50 A and frequency variations of 300 kHz, 400 kHz, 500 kHz. Based on the variation of the electric current and frequency, the optimal electric current and frequency is generated to heat a stainless-steel nut that cannot be opened, or the screw is stuck at 50 A and 500 kHz with a temperature of 394°C in one minute.
Effect of Spindle Speed, Feedrate, Tool Geometry, and Polyester & Vinylester Blends on Surface Roughness and Surface Hardness Alteration of the Hole Adam Malik; Exel Athoriq; Muhammad Hafiz; Hairul Abral
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.27-33.2023

Abstract

In this study, 2 types of polymers were mixed, namely polyester and vinylester called polyester-vinylester blend (PVB) as the test workpiece. The experiments carried out were testing the surface quality of the hole, namely surface roughness (Ra), and surface hardness alteration (SHA) after drilling. In this study, the effects of spindle speed (n) & feedrate (f), cutting-edge angle (Kr), and PVB composition (P%V%) were tested. The results showed that the factor that most influenced the surface roughness value was the feedrate with a contribution value of 39% and the PVB composition (32%) for PVB dominantly polyester. Whereas in vinylester dominant PVB, the most influential factor is the spindle speed (50%). For the measurement of surface hardness alteration that occurs, the factor that affects surface hardness alteration is the cutting-edge angle (44%) in PVB dominantly of polyester. While in vinylester dominant PVB, the influencing factor is spindle speed (44%).
Manufacture of Composite Plastic Pellet Seed Machine Capacity 2.5 Kg/Hour Alfan Ekajati Latief; Cahyadi Suheri
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.34-39.2023

Abstract

Natural fibers are a material that is easily obtained from nature, both animals and plants. Using natural fibers has been commercially applied in various fields, such as automotive and construction, by mixing PPHI (Polypropylene High Impact) with injection molding and forming plastic pellets. Pellets are extruded with natural pineapple fiber for composite, which requires a composite pellet-making machine, which combines two materials that are not aligned with the material mixing method using a screw inside the barrel, then heated by a heater. The screw pushes the pellets that have been mixed and melted to the die and then dried with water, which will go to the Crusher to be chopped into composite pellet seeds. In this research, a plastic extruder machine with a capacity of 2.5 Kg/hour components used a single screw, heater, die, Crusher, barrel, and hopper, and the time delay in this study is 165º and 180º. The screw rotation is constant at 15 rpm, using a screw diameter of 20 mm x 550 mm and a pitch distance of 1D with an inclination angle of 23º.
Retroffiting and Repairing Cooling Tower Structure Within A Tide Deadline Benny Dwika Leonanda
METAL: Jurnal Sistem Mekanik dan Termal Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.7.1.40-47.2023

Abstract

This project focused on the retrofitting of an aging cooling tower at PT. Sulfindo Adiusaha's Chlor Alkali Plant. The goal was to incorporate advanced technology and features into the cooling tower, in response to regulatory modifications and the need to upgrade older buildings to improve their resilience and performance. The existing wood structure of Cooling Tower T 9120 GH was replaced with a new FRP structure, and the Fill Pack was also replaced during the retrofit to restore the cooling capacity to the original design. The project was completed within a tight timeline of 10 days to ensure long-term reliability of operations at the plant.Following the commissioning of the new cooling tower structure, the retrofitted T 9120 GH cooling tower was able to deliver a cooling capacity of 10.8 million Kcal with an efficiency of 78.6%, indicating good condition and close to the original design performance. The maximum vibration data on the motor and base frame were recorded at 10 mm/s2, which is within the satisfactory category based on the CTI Standard. Motor bearing temperature was recorded at 65°C, indicating good performance.This project demonstrates the importance of timely upgrades to maintain plant operations and ensure long-term reliability. Retrofitting an aging cooling tower can improve its functionality, efficiency, and environmental impact. The success of this project also highlights that retrofitting can be done within a tight timeline, without compromising on safety or quality, provided proper planning and execution are in place.

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