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METAL : Jurnal Sistem Mekanik dan Termal

metal
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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 143 Documents

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Pengaruh Fraksi Massa Serat Terhadap Kekuatan Fatik Material Komposit Berpenguat Serat Tandan Kosong Kelapa Sawit Devi Chandra; Randha Mulia; Dedison Gasni; Gusriwandi Gusriwandi
METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 2 (2018)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The present study was investigated the effect of fiber mass fraction on the tensile and fatigue strength of oil palm fiber reinforced composite and resin as the matrix. Fatigue test has been performed by using rotary bending fatigue machine. The specimens were made by press hand lay-up with matrix to fiber mass ratio was 90:10, 80:20 and 70:30 respectively. Fracture surface of fatigue specimens have also been observed by using digital camera to knowing the failure mode. The results showed that the tensile and fatigue strength and fatigue life increased with increasing the fiber mass fraction as seen in the S-N curve. The fatigue limit was found 0.27 MPa, 0.55 MPa, and 0.82 MPa for composites with 90:10, 80:20 and 70:30 of matrix to fiber mass ratio respectively. The observed failure modes were matrix cracking, fiber debonding, and fiber breaking.

Kajian Aerodinamika Pada Model Kendaraan dengan Penerapan Kontrol Aktif Suction Rustan Tarakka; Nasaruddin Salam; Jalaluddin Jalaluddin; Wawan Rauf; Muhammad Ihsan
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 1 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

As the air flow reaches the rear part of the vehicle the flow will undergo separation generated by friction and fluid viscosity, and creating wake, considerably large turbulent area with low pressure at the rear of the vehicle which results in pressure drag which can reduce vehicle performance. The research was carried out with a computational and experimental approach. The test model used in this study is a model of a family van model which is a modification of the Ahmed body model. The rear part of the vehicle model is equipped with an active control feature in the form of a suction with a slant angle (α) of 35°. The upstream speed and suction speed are 11.1 m/s and 0.5 m/s, respectively. The results obtained indicate that the application of active suction control is able to reduce wake formation and delay flow separation compared to the uncontrolled model, and is able to increase the minimum pressure coefficient on the rear wall of the vehicle model with an increase of 41.49%, and is able to reduce the drag coefficient by 11.0260% for the approach. computation and 11.0080% for the experimental approach.

Pengaruh Sudut Geram dan Parameter Pemesinan Terhadap Keausan Tepi Pahat High Speed Steel (HSS) pada Proses Bubut Glass Fibre Reinforce Polymer (GFRP) Muhammad Yusra Nusa; Firman Ridwan
METAL: Jurnal Sistem Mekanik dan Termal Vol 2, No 1 (2018)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The high rate of tool wear is an obstacle in machining of GFRP material. This research was conducted to investigate turning behavior towards the occurrence of flank wear on HSS devices by varying machining parameters such as rake angle, spindle speed and feed rate. The GFRP of workpiece was made from resin as a matrix and the glass type Chopped Strand Mat as fiber. The rack angle of tool is varied to 5º, 10º, 15º, 20º. Taguchi method was used to analized data experiments using orthogonal array L8. The experimental data shows that the spindle speed is the most influential parameter on flank wear with a S/N ratio of 4.10, followed by the feed rate with a S/N ratio of 3.08. Increasing rake angle can reduce wear, the smallest wear value was obtained at an angle of 20º.

Perancangan dan Perencanaan Mesin Pemipih Emping Jagung Skala Industri Gilang Gerry Garnida; Rudy Yuni Widiatmoko; Syahrul Ariq Ismail; Donny Firli Ardiawan; Nuha Desi Anggraeni; Budiana Ruslan
METAL: Jurnal Sistem Mekanik dan Termal Vol 4, No 2 (2020): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

UKM XYZ is a corn chips processing business that still uses the traditional method which requires a lot of time and effort. From this problem, the idea emerged to design a corn chip flattening machine which aims to speed up production time and reduce the energy spent processing corn chips. The research stage consisted of the problem identification stage, the goal-setting stage, the drafting stage, and the planning stage. The EOQ Economic Order Quantity method is used to determine the forecast for raw material requirements, the forecasting result is 11.7408 kg. The corn sheller machine is designed to have a capacity of 80 kg/hour, using a 120-watt electric motor, which is connected using a pulley and a belt to 2 axles with a diameter of 30 mm with a length of 620 mm and 570 mm in order to meet the needs of UKM XYZ. On the shaft, a gear is attached to cause rotation of the 2 axles in opposite directions. The piping uses 2 rollers with a diameter of 100 mm and a length of 400 mm. Component materials that have contact with corn use AISI 304 material because this material has high tensile strength and is categorized as a standard material for processing food.

Kaji Eksperimen Limbah Cair Detergen Sebagai Sumber Energi Alternatif Endri Yani; Sandri Kristian Dawolo
METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Detergent fluid waste is the useless product produced during the laundry process. Generally, the detergent waste is directly throw away to the water channel. In this research, the waste potential as the alternative energy is evaluated. Because of detergent is one of derivative product of crude oil, therefore it can be mixed with ash and charcoal and utilized as the electrolyte material for dry cell. In this research several types and composition of detergent waste such as solid, liquid and powder are analyzed. It was shown that the average voltage and the electric current produced by dry cell are 0.7 V - 0.8 V and 0.7 mA-1.3mA, respectively. The experiment results show that the higher of detergent concentrate, the larger electric current will be produced. Furthermore, using the same volume of electrolyte material, the battery using coconut shell mixed charcoal produces larger electric current than that using rice husk mixed charcoal.

Efek Penggunaan Water Mist Terhadap Tekanan, Temperatur dan Kinerja Sistem Mesin Pengkondisian Udara Tipe Terpisah Azridjal Aziz; Bungsu Herwanto; Rahmat Iman Mainil
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 2 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The air conditioning machine commonly used is air conditioning system with a vapor compression cycle. The use of air conditioning machines consumes more electrical energy than other household appliances. In this study, the addition of the water mist method in evaporative cooling system with variations of distance of 20 cm, 40 cm, 60 cm so that the energy consumption of split type AC (Air Conditioning) of machines is more efficient. The results showed that the pressure of the condenser using water mist was lower 48 Psig than the pressure of condenser with a cooling load of 2000 W, and lower by 34 Psig of the pressure of condenser without the cooling load. Meanwhile the temperature of the air entering the condenser (Tout) after using a water mist has lower temperature than without the water mist, therefore it can save electricity consumption in the compressor. The temperature of the lowest inlet air of the condenser reached at the use of water mist with a distance variation of 60 cm was 28 ℃. And the relative humidity (RH) relatively decrease at the exit of the condenser using water mist with distance variation of 60 cm length was 59.6%. The compressor power decreased lower using a 60 cm distance water mist of 0.52 kW compared to without using a water mist with a 2000 W load of 0.56 kW. So that COP using water mist higher about 5.24 than without a water mist of 4.72. The highest COP was obtained using water mist at a distance of 60 cm

Pengujian Turbin Air Pusaran Gravitasi dengan Variasi Overlap Ratio Rotor Muhammad Luthfi; Meri Rahmi; Rachmatullah -
METAL: Jurnal Sistem Mekanik dan Termal Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The gravitational water vortex turbine is a turbine system that can convert the energy from artificial water vortex by means of the drained water through the basin outlet to the kinetic energy of rotor rotation. This type of turbine system is able to produce energy despite the low head of water flow. Many researches were conducted to improve the efficiency of this turbine by changing the shape of basin, or the rotor. Meanwhile, the Savonius rotor has good starting rotation and ease of fabrication, but low efficiency. One way to increase the efficiency of this rotor is to apply the gap between the blades which is called Overlap Ratio (OR). In this research, the gravitational water vortex turbine with the conical-shape basin was combined with the various-OR Savonius rotors with area proportion of 26,88% and without endplate and the effect was observed to the efficiency of turbine. The volume flowrate of channel was maintained constant at 0,005 m3/s while mass was added gradually for the torque measurement system by using rope brake dynamometer. The result showed that for all rotors, the greater efficiency occurred in the low rotational speed. Moreover, the rotor with OR of 0,15 had greater mechanical efficiency which was around 22,78% for the rotor with endplate 26,88% and 27,18% for the rotor without endplate than rotor with OR of 0. Meanwhile, rotor without endplate had higher maximum mechanical efficiency for all OR variation than that with endplate 26,88%.

Rancang Bangun dan Studi Eksperimental Pengaruh Perbedaan Jarak Pitch dan Kemiringan Poros terhadap Kinerja Mekanik Model Turbin Ulir 2 Blade Pada Aliran Head Rendah Yul Hizhar; Bambang Yulistianto; Suryo Darmo
METAL: Jurnal Sistem Mekanik dan Termal Vol 1, No 1 (2017): Volume 1, No 1 (2017)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Screw turbine uses low head and high flow rate of water to generate rotation speed. Screw turbine has many advantages such as simple in construction and installation, low cost in operating and maintenance, and fish-friendly. The influencing parameters to mechanics performance of screw turbine are pitch distance and the shaft slope. The purposes of this research are to design 2-blades screw turbine model and to test the influence of pitch distance variation and shaft slope to mechanics performance in laboratory. This research used experimental method which each of screw turbine model with pitch of 2Ro, 1.6Ro, and 1.2Ro were tested in variation of shaft slope of 25˚, 30˚, 35˚, 40˚, and 45˚. The water flow rate was 0.00728 m3/s. The data was acquisitioned at Hydraulics Laboratory Civil Diploma Universitas Gadjah Mada. The result of testing without load showed that screw turbine model pitch of 2Ro had the higher rotation speed than pitch of 1.6Ro and 1.2Ro which the highest rotation speed was 255 rpm at shaft slope of 35˚. The result of testing with load showed that each turbine produced the highest rotation speed and output power at the shaft slope of 35°, meanwhile the highest efficiency was produced at the shaft slope of 25°. The result of research showed that generally screw turbine model pitch of 2Ro produced the higher mechanics performance (output power and efficiency) than pitch of 1.6Ro and 1.2Ro. At the shaft slope of 25°, pitch 2Ro produced power 15.89 W and efficiency 73.08% (the highest), meanwhile at the shaft slope of 35°, pitch 2Ro produced power 18.51 W (the highest) and efficiency 66.16%. These efficiencies result difference were caused by the influence of the difference of hydropower (input power) at the variations of the shaft slopes.

PENGARUH PENGGUNAAN KOLEKTOR PLAT DATAR PADA PENGERING PADI TIPE DRUM DRYER Nur Hidayati; Iskandar Ridwan
METAL: Jurnal Sistem Mekanik dan Termal Vol 3, No 1 (2019)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Rice is one of food items consumed by most Indonesian people. Rice quality is a matter that must be considered in rice production. Rice quality can be improved by proper post-harvest handling, one of which is the drying process. The drying process can be done by drying under the sunshine and drying by using a dryer. Drying under the sunshine takes a long time, is difficult to control, depends on the weather, is easily contaminated and requires a large place. To overcome this problem, a dryer is needed. The dryer used is the drum dryer type. This drum dryer also utilizes mechanical energy from the gasoline engine so that it can rotate the drum. On the inner surface of the drum, stirring blades are installed. This dryer also uses heat coming from internal channel wall solar collectors. In this experiment was carried out with 4 free variations, namely: motor rotation, air flow velocity, intensity of solar radiation and cycle time. Three or four data are taken from each variation. When the experiment is taking place, varied parameters and planned parameters such as temperature absorber, ambient temperature, collector outlet air temperature and drying chamber temperature are measured. And at the final of the experiment for each variation, final mass of dried rice are measured. From the result of research, it can be concluded that the optimum rice mass reduction rate was obtained for each variation, namely at 905.1 rpm motor rotation, 10 m/s air flow rate, 948 W/m2 intensity of solar radiation and 30 minutes rotation time.

Sintesis Dimensi Manipulator Paralel Bidang Dua Derajat Kebebasan Dengan Rantai Kinematik Paralelogram Simetris Adriyan Adriyan
METAL: Jurnal Sistem Mekanik dan Termal Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

The paper discussed the process to find the optimum dimension for the kinematic constants of a two-degree of freedom planar parallel manipulator. This manipulator itself was constructed by symmetric three parallelogram chains. An optimization process using non-sorted dominated genetic algorithm II (NSGA-II) was carried out for maximization of (i) rMIC (the radius of the maximum inscribed circle) and GCI (global conditioning index), and (ii) rMIC and GTI (global transmission index). Here, GCI and GTI were evaluated on the useful workspace. Instead of using atlases of performance indices, a grid search evaluation was applied to obtain a region in PDS near the optimum values for both maximization cases. This region gave a small bound for NSGA-II to start searching the optimum values of the kinematic constants. For simplification, a python framework for the multi-objective optimization called pymoo was applied to solve the optimization problem. Henceforth, the maximization for two cases yielded an insignificant difference of results in terms of optimum kinematic constants, rMIC, GCI, GTI, area of useful workspace, area of good condition workspace (GCW), area of good transmission workspace (GTW), and the area ratio of GCW and GTW to the useful workspace.

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Lovely Son

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Home Page

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Contact Name Lovely Son

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Editorial Address Kampus Limau Manis, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Andalas

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Contact Name
Lovely Son

Contact Email
lovelyson@eng.unand.ac.id

Phone
+6281213552846

Journal Mail Official
metal@eng.unand.ac.id

Editorial Address
Kampus Limau Manis, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Andalas

Location
Kota padang,

Sumatera barat

INDONESIA