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Jurnal Teknik Mesin
Published by Institut Teknologi Padang
ISSN : 20894880     EISSN : 25988263     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Jurnal Teknik Mesin (JTM) is a journal aims to be a peer-reviewed platform and an authoritative source of information. We publish original research papers, review articles and case studies focused on mechanical engineering and other related topics. All papers are peer-reviewed by at least two referees. JTM is managed to be issued twice in every volume (April and October).
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Articles 11 Documents
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Search results for , issue "Vol 10, No 2 (2020)" : 11 Documents clear
The Effect of Misalignment to Vibration, Electric Current and Shaft Rotation Speed on The Coupling Transmision Romiyadi Romiyadi; Purnama Irwan
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Coupling is one of the components are widely used in various industries. Coupling is widely used as a power transfer transmission. Coupling have a long life time, it mean coupling was damage if out of the maintenance. The one factor is misalignment. This study aim to determine the effect of misalignment on the coupling transmission to vibration, electric current and shaft rotation speed. In this study, was done alignment process with variations of misalignment on the coupling transmission and was done measurement value of vibration,  electric current and shaft rotation speed. The study results show that the changed of misalignment would give a positive impact to vibration and electric current. For the effect misalignment to shaft rotation speed, the study results show that the changed of misalignment would give a negative impact to shaft rotation speed.
The Influence of the Initial Angle of the Cut and the Depth of Cut on the Shaping Process to Edge Wear of HSS Chisel Anrinal Anrinal; Asmara Yanto; Hendriwan Fahmi; Yanto Darman
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

The purpose of this research is to provide an overview of the effect of the initial angle of cut and depth of cut on the edge wear of the HSS chisel in the wear resistant steel cutting process using a scrap machine. This research was conducted using the KLOPP brand scrap machine, Type 550, Machine Code SC 01, Cutting speed (V) 15 m / min, Feeding motion (f) 0.4 mm / step, cutting time 5 minutes, using HSS Bohler scrap chisel Rapid Extra 1200 (3/8 "X 4") with variations in the initial angle of cutting (λ) 50 , 150, 250 and variations in the depth of cut (a) 0.4 mm, 0.8 mm and 1.2 mm. The results showed that an increase in the initial angle of cut and depth of cut tended to result in an increase in the edge wear of the HSS chisel.
Study of Experimental Vibration Due to Misalignment of Pulley-Belt in Rotary Machine Asmara Yanto; Anrinal Anrinal; Rozi Saferi; Zultri Memori
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This study aims to investigate the vibration of rotary machine due to misalignment of its pulley-belt, experimentally. Here, the rotary machine is driven by an AC motor with pulley-belt transmission that positioned on the outer portion of shaft-rotor. To generate vibration of rotary machine, pulley-belt is conditioned to have a combination of offset and angular misalignments. Offset misalignment variations are 0, 2, 4, and 6 mm and angular misalignment variations are 0ᵒ, 2ᵒ, 4ᵒ, and 6ᵒ. Vibration of rotary machine is measured on the bearing housing by use MEMS-based accelerometers. The measured signal of vibration acceleration is acquired with a data acquisition device to obtain vibration spectrum. From the investigation to vibration spectrum has been done, it can be concluded that vibration of rotary machine has characteristic with dominant frequencies at 1xRPM of shaft and at 1xRPM of motor. The vibration amplitude at 1xRPM of shaft is higher than the vibration amplitude at 1xRPM of motor. From this investigation, it is not possible to find differences in the characteristics of vibrations significantly that occur between vibrations due to offset misalignment, angular misalignment or their combination.
The Effect of Hold Time Variation in the Annealing Process To Mechanical Properties and Microstructure of Austenitic Manganese Steel Ilham Azmy; Albert Daniel Saragih
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Manganese steel is a special alloy steel which has good mechanical properties, especially high ductility and toughness values. This steel has high work hardening capability so it will be easy to engineer. In industrial applications, this steel is susceptible to a decrease in the value of its mechanical properties such as the hardness value due to continuous loading. From these problems, a steel engineering process is needed in order to significantly improve the mechanical properties of steel so that it has good durability and lifetime. This study aims to determine the effect of holding time of heat annealing treatment process on the microstructure and mechanical properties of austenitic manganese steel. This research was conducted by heating the annealing process at a temperature of 1000 oC with four variations of holding time for 0, 40, 80, and 120 minutes. After the austenitic manganese steel specimen is heated for a certain time, it is then subjected to very high temperature cooling (in the furnace). The steel specimen is then prepared for metallographic testing and mechanical properties (hardness) testing. Metallographic testing is carried out to be able to analyze the microstructure formed in the austenitic manganese steel specimens after undergoing annealing process. From the metallography results, it was found that the effect of holding time on the annealing process affected carbide precipitation at the grain boundaries in the austenite matrix of manganese steel specimens. In the annealing process with a holding time of 80 minutes, the austenitic manganese steel showed a microstructure with perfect carbide precipitation at the grain boundaries so that this would have an effect on a significant increase in the hardness value. From the results of the hardness test, it was also found that the hardness value of steel specimens by annealing process for 80 minutes was 39.5 HRc. Thus, the effect of the optimal holding time of the annealing heat treatment process to improve the microstructure and mechanical properties (hardness value) is 80 minutes
Design, Fabrication and Analysis of Material Requirements of Spices Mixing Machine Rozi Saferi; Asmara Yanto; Jendri Surianda
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

The process of mixing the spices often done manually, which it takes time and reduces the effectiveness of the process. This study aims to analyze the design, material requirements and production process of a spices mixer machine. In this work is also done to analyze the speed optimization in mixing process of spices with the main food. Analysis of the machine design using the finite element method by aided Autodesk Inventor software. The analysis results show that the mass density of the frame is 8.8041 g/cm3, and the maximum compressive strength is 345 MPa. Furthermore, the young’s modulus is 200 GPa, the position ratio is 0.3 and the shear modulus is 76.9231 GPa. The test of spices mixer machine showed that the optimal spice stirring value occurred at 35 rpm with a mixing percentage of 83%.The process of mixing the spices often done manually, which it takes time and reduces the effectiveness of the process. This study aims to analyze the design, material requirements and production process of a spices mixer machine. In this work is also done to analyze the speed optimization in mixing process of spices with the main food. Analysis of the machine design using the finite element method by aided Autodesk Inventor software. The analysis results show that the mass density of the frame is 8.8041 g/cm3, and the maximum compressive strength is 345 MPa. Furthermore, the young’s modulus is 200 GPa, the position ratio is 0.3 and the shear modulus is 76.9231 GPa. The test of spices mixer machine showed that the optimal spice stirring value occurred at 35 rpm with a mixing percentage of 83%.
The Effect of Volume Fraction on Acoustic Properties of Areca Nut Midrib Fibers Composites with Natural Adhesives Putri Pratiwi; Hendriwan Fahmi; Asmara Yanto; Idel Fitra Soni
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Areca nut Midrib is one of agricultural waste that has many benefits to be recycled for household purposes such as plates, jars and others. Moreover, for many researchers, areca nut midrib fiber was used as a filler of composites material. From several studies it is known that this material has good potential as a filler in composites because of its good mechanical properties. In addition, this material is also considered as a good sound absorber. Therefore, this research will investigate the ability of sound absorption from this material in a various composition. We used Areca nut Midrib fibers as a filler and pine sap as a matrixof composite with a volume fraction of 70%: 30%, 75%: 25%, 80%: 20%, 85%: 15%, 90%: 10%.  The sound absorption coefficient of composites was studied using impedance tube method with 500, 1000 Hz, 1500 Hz, 2000 Hz, and 2500 Hz frequency. The results showed that at a test frequency of 500 Hz, the value of sound absorption coefficient increases with the increase of Areca nut Midrib fraction. This research shown that there is an effect of volume fraction on the acoustic properties  and Areca nut Midrib fiber composite have potential used as sound absorption materials, based on ISO standard 11654:1997.
Experimental Study on Flight Time and Frame Toughness of Quadcopter Based on Waste Polystyrene Paper Mastariyanto Perdana; Meiki Eru Putra; Farid Septio Matrilindo
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Application of natural composite materials for aerial fields has been widely developed. One of the uses of natural composite materials for Unmanned Aerial Vehicle (UAV) frame. In this study, waste polystyrene paper, bagasse powder and eggsheel powder was used for material of UAV frame. Type of UAV was made in this study is quadcopter. Addition of volume fraction of waste polystyene paper to 65 % in green composite material.  The aims this study was determine the flight time and toughness frame of quadcopter based on waste materials. This study showed that there was increase of quadcopter flight time with the addition of  waste polystyrene paper in composites up 65% by volume fraction. Addition of  waste polystyrene paper in composites up 65% by volume fraction, the results showed that the toughness frame of quadcopter was decreased. Photomacro was used to show the stucture and porosity of frame quadcopter based on natural composite material.
Effect of Chromium Doping to Hardness Properties in the Manufacture of Spur Gears Made from Ferrous Powder Albert Daniel Saragih; Slamet Sutjipto
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

A gear is a part of a machine that has a very complex shape so that it requires special care and expertise in the manufacturing process. Powder metallurgy offers an efficient manufacturing process for the production of these complex machining parts. In this study, Cr metal powder was selected to increase the hardness properties of spur gears made from iron (Fe) powder. Doping Cr by 0%; 0.5%; 10%, 1.5% and 2.0% will be added in gear manufacturing. Water is used as a binder with a ratio of 1:15 which is then packed by 15,000 kg or 15 tons then heated or sintered at a temperature of 1200 oC for 1 hour. The shrinkage ratio of the sample to the sintering treatment averaged 4.6%. 0.2 kg of load applied to the Vickers hardness test. Vickers hardness values obtained were 60, 77, 90, 184 and 211 respectively for the Cr doping of 0%; 0.5%; 10%, 1.5% and 2.0%. From these data it is found that the addition of the element Cr increases the hardness properties of iron gears. The hardness value shown is still too small, this is because there is still a lot of porosity generated in the sintering process because it is not in a vacuum condition.
Preventive Maintenance Study on H-25 Gas Turbine Sulaiman Sulaiman; Fahmirullah Fahmirullah
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This study aims to determine the effect of the time-based maintenance method preventive maintenance, namely major inspection on the efficiency of H-25 gas turbine. The efficiency calculation method based on operating data from the gas turbine. The effect of major inspection can be seen from the compressor efficiency, turbine efficiency and fuel consumption. The results of calculations before the major inspection are 80% of compressor efficiency, 83% of turbine efficiency, and 0.751 kg/kWh of fuel consumption, while after the major inspection, compressor efficiency is 80%, turbine efficiency is 85% and fuel consumption is 0.740 kg/kWh.This study aims to determine the effect of the time-based maintenance method preventive maintenance, namely major inspection on the efficiency of H-25 gas turbine. The efficiency calculation method based on operating data from the gas turbine. The effect of major inspection can be seen from the compressor efficiency, turbine efficiency and fuel consumption. The results of calculations before the major inspection are 80% of compressor efficiency, 83% of turbine efficiency, and 0.751 kg/kWh of fuel consumption, while after the major inspection, compressor efficiency is 80%, turbine efficiency is 85% and fuel consumption is 0.740 kg/kWh.
Kinematics and Singularity Analysis of 2 DOF Planar Parallel Manipulators with Symmetrical Parallelogram Chains Adriyan, Adriyan
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This paper presented the kinematic and singularity analysis of two degree of freedom planar parallel manipulator or 2DOF PPM, in short, with symmetrical parallelogram chains. There were two configurations of 2DOF PPM that analyzed in this paper, that were 2-ΠΠΠ and 2-ΠΠ. Both PPM were represented on a topology diagram using graphs, respectively. Before conducting a kinematic analysis, 2-ΠΠΠ dan 2-ΠΠ were simplified to an equivalent kinematic chain, which was a well-known 5R kinematic chain. Then, the closed-form solutions for the inverse kinematic and the direct kinematic of the PPM were obtained by using the equivalent kinematic chain. Afterward, the velocity analysis was carried out to acquire Jacobians of the PPM. Hence, the singularity analysis can be performed to investigate singularity conditions that existed on the manipulator using these Jacobians. The singularity analysis showed that three singularity conditions existed on the manipulator, i.e. inverse, direct, and combined kinematic singularity. An insightful schematic was provided to illustrate each singularity condition.

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