METAL : Jurnal Sistem Mekanik dan Termal
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
Articles
143 Documents
<![CDATA[Optimalisasi Dimensi Tabung Roasting Kopi Kapasitas 2 kg dengan Pendekatan Model Elemen Hingga ]]>
<![CDATA[Dedi Suryadi]]>;
<![CDATA[Bowo Anugrah]]>;
<![CDATA[Ahmad Fauzan Suryono]]>;
<![CDATA[Agus Suandi]]>;
<![CDATA[Novalio Daratha]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.6.1.1-7.2022
<![CDATA[Coffee roasting is an important process in the coffee industry that determines the quality of the coffee beverage obtained. The roasting process is carried out in a cylindrical tube having high temperature. Therefore, thermal stress on the cylindrical tube (drum) should be focused. In this paper, both appropriate materials selection and optimal dimension of the roaster drum are considered. Drum is given both thermal load of 200oC and a coffee load of 2 kg. Here, Aluminum Alloy 5083 and Stainless Steel 304 are analyzed as drum materials because these materials are recommended for foods. Finite element method is used for drum analysis with axisymmetric model. Moreover, optimal dimension of drum can be obtained by varying the length, diameter and thickness. The results show that Stainless Steel 304 is suitable material for drum under both thermal load and both thermal load of 200oC and a coffee load of 2 kg. While, dimensions of drum are length of 450 mm and diameter of 180 mm with thickness of drum larger than 1 mm.]]>
<![CDATA[Performansi Turbin Angin Poros Vertikal Tipe Savonius 2 Tingkat Untuk Pengisian Baterai Sebagai Penerangan Lampu Perahu Nelayan Kota Padang ]]>
<![CDATA[Rizki Muhamad Amsor]]>;
<![CDATA[R. Iskandar]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 1 (2017): Volume 1, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.1.1.9-19.2017
<![CDATA[The biggest energy source used today is still predominantly derived from fossil fuels, which is known fossil energy resources are non-renewable so that over time will run out. Therefore, the nowadays conditions should utilize energy sources that are renewable. One of the renewable energy sources that are environmentally friendly and are easy to come is wind energy, which its utilization uses wind turbines. Wind turbines can be used for generating electricity so that it can overcome one of the problems of energy for the fishermen in Padang. Padang has a low to medium wind speeds, so that the suitable wind turbine is Savonius turbine type. The research was done by creating a model of Vertical Axis Wind Turbines (TASV) Savonius type with 2 stages of blades made of aluminum material. Each rotor is having 50 cm diameter and 80 cm height. Parameter studies that measured are wind speed, rotor rotational speed, turbine force, voltage and current in the generator. Meanwhile, the observation is held on Air Tawar Padang, West Sumatra. From the performance of the Savonius wind turbine in this research is got 5.9 m/s maximum wind speed, 225,8 rpm maximum turbine rotation, 4.7% the highest Cp and 2 watts the highest power and can catch 160.2 watts the wind power.]]>
<![CDATA[Pengontrolan Kecepatan Aliran Vortex Berbasis Arduino Sebagai Metoda Pemisah Campuran Serbuk Tembaga dan Aluminium ]]>
<![CDATA[Fico Trianda Ravelli]]>;
<![CDATA[Firman Ridwan]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 1 (2019) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.3.1.51-58.2019
<![CDATA[Several methods have been developed to separate gold from alluvial using the principle of density. Density is used as a basic concept in material separation. One of the supporting methods that can be used to utilize the vortex flow as a separation medium. With vortex flow, two materials of different density can be separated through lift force. This study aims to determine the effect of vortex flow velocity on its ability to separate two different types of density material. Aluminum and Copper powders are used as test materials with a powder size of 18-200 mesh. The tests are carried out with a variation of 10 flow rates with water as a fluid. The results showed that Aluminum and Copper can be optimally separated at the flow rate (165.25-167.77) ml/s. While for the most effective effectiveness of Al separation is the flow rate (163.22-168.87) ml / s and copper separation at the flow rate (83.5-85) ml/s.]]>
<![CDATA[Rancang Bangun Low-Budget Autonomous Quadcopter ]]>
<![CDATA[Budi Hartono]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.5.2.60-66.2021
<![CDATA[Quadcopter is an unstable flying vehicle. The flight controller regulates the rotational speed of the four motors, so that each propeller produces the lift required for the quadcopter to fly stable. It is interesting to know whether the use of generic quadcopter components obtained in the market can be mutually compatible. A stable and controllable quadcopter is a requirement for a quadcopter to fly autonomously. This research focusses on design a low-budget autonomous quadcopter. The research method consists of three main stages. First, the design and build phase of the quadcopter. The main frame and quadcopter arms are designed with a diagonal distance between the rotors of 45 cm. The basic components of the quadcopter are selected which are mutually compatible and assembled on the frame and arms. The flight controller is connected to the GPS, transmitter, and receiver. The autonomous system also involves a ground control system in the form of a Mission Planner. Second, the flight test stage is setting the PID constant so that the quadcopter can fly stable. PID tuning produces proportional constants of 0.088, integrals of 0.016, and derivatives of 0.008. Third, the autonomous flight test stage. The success of autonomous flying is known by analyzing the difference in input waypoint coordinates through the Mission Planner against the results of low-budget GPS receiver readings on autonomous flying missions. GPS accuracy was analyzed by calculating the 2DRMS and CEP values. The best value of 2DRMS = 1.56 meters and CEP = 0.64 meter occurred at Waypoint #2.]]>
<![CDATA[Penghitungan Beban Kritis pada Struktur Kolom Kontinu dengan Dua Bentangan akibat Pembebanan Secara Aksial ]]>
<![CDATA[Eka Satria]]>;
<![CDATA[Nusyirwan Nusyirwan]]>;
<![CDATA[Muhammad Irfan]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 2 (2018) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.2.2.7-13.2018
<![CDATA[This paper is aimed to determine the critical buckling load of continous column with two spans under axial loading. Firstly, the critical buckling loads is calculated theoretically based on concept of solid mechanic. The calculation is conducted for various ratio of L1/L2. This ratio shows a comparison of two span lengths. The used ratios in this calculation are L1/L2= 1/3,1/2, 2/3, 1/1, 3/2, 2/1, and 3/1. The critical buckling loads is calculated based on elastic analysis. For practical application, the results then are approached by regression technique of a least square method to find the best fit of design equation. Later, this equation is recommended as a practical equation in determining the critical buckling of continous column with two spans under axial loading.]]>
<![CDATA[Separasi Aliran pada Permukaan Atas Airfoil Kumbang Kelapa dengan Metoda China Clay ]]>
<![CDATA[Benny Dwika Leonanda]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 4, No 2 (2020): Jurnal Sistem Mekanik dan Termal (METAL) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.4.2.99-105.2020
<![CDATA[This study is aimed at identifying airfoils by mimicking the curved shape of the wings of a flying animal. This interferes with what people did in ancient times to obtain objects capable of flying. The animal profile selected was the Coconut Beetle (Rhinkoporus Rhigidoporus). The wings were divided into nine pieces and made a wing model with a chord size of 15 cm, a length of 45 cm and tested in a subsonic force draft wind tunnel with a test section measuring 45 x 45 x 100 cm3. Tests are carried out to measure the length of flow separation on the upper surface of the airfoil at Reynolds and the different angles of attack of the airfoil. The China Clay method was used to determine the separation point on the airfoil surface, and the test results obtained various separation points for different angles of attack and Reynolds number.]]>
<![CDATA[Kaji Perbandingan Karakteristik Respon Dinamik Suspensi Sepeda Motor dengan Memakai Peredam Viscous Oli Sintetis dan Minyak Nabati ]]>
<![CDATA[N Nusyirwan]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.1.2.133-141.2017
<![CDATA[The motorcycle is a vehicle which is widely used by people today, especially in the narrow streets. This vehicle is able to meet the needs of users because it is cheap, fuel-efficient is also very dynamic to reach places that are difficult to reach by four-wheeled vehicles that have large dimensions. In addition to the many advantages of two-wheeled vehicles should also be taken into account in terms of comfort and safety. Safety factor will depend on many factors, other than humans as a rider, vehicle reliability and the quality level of the road is an important safety factor. Factors vehicle will be in direct contact with the road in its path. Regarding the main factor for the safety of the road is how the vehicle is still stable when it fell into a deep hole or a very rough road. Suspension as one of the main tools to respond to the shock loads on a motorcycle is the main factor that should be taken into account. Types of suspension are used to reduce response style and shock will be felt directly by passengers. This is one study which the suspension is an extremely important characteristic studied. One that plays a role in the election of a suspension damper oil. Oil damper as viscous dampers shock loads can convert into friction and heat. Viscous good silencer is to transfer mechanical energy into heat as much as possible, without changing the characteristics of the damper oil itself. Oils tested, there are three types of commercial oil chosen by the suspension manufacturers. This study was conducted to replace oil with vegetable oil palm oil CPO output can reduce the amplitude of 9.2 cm for shock loads of 20 kg with a height of fall of 3 m. Fall height of 3 m damping ratio of vibration damper formed by CPO was 0.41.]]>
<![CDATA[Design and Construction of Micro-hydro Model With Different Flowrate as a Learning Medium ]]>
<![CDATA[Diki Ismail Permana]]>;
<![CDATA[Dini Fauziah]]>;
<![CDATA[Decy Nataliana]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 4, No 1 (2020): Jurnal Sistem Mekanik dan Termal (METAL) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.4.1.28-32.2020
<![CDATA[Renewable energy generation such as hydropower, micro-hydro, and pico hydro are among the concerns of the government to reduce the greenhouse effect, gas emissions, and global warming and have set targets in 2025. Higher education institutions are expected to contribute to government development targets, one of which is by producing human resources, which is reliable, especially in the field of renewable energy and hydropower generation. So, we need innovative learning methods or media in the teaching and learning process. In this case, a set of demonstration tools in the form of a micro-hydro system model with varying parameters so that students can easily understand a course and could connect the theory with the real world/industry.]]>
<![CDATA[Accuracy of Turbulent Closure Models in Calculation of Thrust of a Low Reynolds Number Airfoil Used as a Propeller ]]>
<![CDATA[Adek Tasri]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.6.1.38-42.2022
<![CDATA[Unlike in the case of high Reynolds number airfoil, selecting a turbulent closure model for the low Reynolds number airfoil is still a challenge. A turbulent model used for high Reynolds number airfoil is not necessarily suitable for low Reynolds number airfoil due to the presence of separation bubbles in the low Reynolds number airfoil. In this study, we used two simple turbulent models, Spalart-Allmaras and k- , in calculating thrust coefficient of low Reynolds number airfoil used as propeller to determine their accuracy. It was found that there was a significant discrepancy between the numerical calculation results by both the turbulent model and the experimental data. The k- was a little more accurate than Spalart-Allmaras turbulent closure model.]]>
<![CDATA[Studi Eksperimen Pengaruh Penggunaan Koh Terhadap Performa Generator HHO Tipe Dry Cell Dengan Dimensi Setiap Plat 3.046,59 Mm2 ]]>
<![CDATA[R Nofriyandi]]>
<![CDATA[ METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 1 (2017): Volume 1, No 1 (2017) ]]>
Publisher : <![CDATA[Department of Mechanical Engineering, Universitas Andalas ]]>
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DOI: 10.25077/metal.1.1.47-54.2017
<![CDATA[This research is aimed to analyze efficiency and produced HHO gas from HHO type dry cell generator. The experimental apparatus of a generator consists of 4 cells and four neutral plates for each cell is produced. The generator plate used in the electrolysis process has dimension 30.29 mm2. The total area of plate is 70 mm x 70 mm and it has a single hole with diameter 12 mm located in the middle of the plate. To collect the data, the generator has been operated for 2 hours. The efficiency of the generator is evaluated by addition of 5, 7 and 9 gram KOH into the cell. It was shown from the experiment that, the average of HHO gas resulting from 5 gram KOH is 6.45 ml/s with efficiency 89.39%. Meanwhile, for 7 and 9 gram KOH, the average HHO gas are 9.31 ml/s and 12.92 ml with efficiency 72.29% and 83.49%, respectively.]]>
