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<![CDATA[Microstructures Changes in Aluminum 6061 Due To Oxidation before MMAW Welding ]]>
<![CDATA[Anrinal Anrinal]]>;
<![CDATA[Asmara Yanto]]>;
<![CDATA[Rahmad Hidayat]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[This work aims to provide an overview of the changes in the microstructure of Aluminum 6061 because it was oxidized prior to MMAW welding. The research was conducted by first allowing aluminum 6061 to oxidize in the air (atmosphere) with a time variation of 0, 120, and 240 hours. The MMAW welding process uses a 1G welded seam without a 1G position, Grilumin 14 electrode, AWS A5.3-99 specifications, E4043 3.2 mm in diameter, with a DC current of 90 Amperes. The welding results show that the weld surface appears sooty and rough spots where the longer the oxidation occurs produces more soot and spots, while the results of the microstructure examination on the weld area and the HAZ area show that the micro structure of the weld area and the HAZ area experiences increased grain size.]]>
<![CDATA[Exergy Study of Steam Flash Cycle & Kalina Cycle at Waste Heat Recovery Power Generation Operation System ]]>
<![CDATA[Arfidian Rachman]]>;
<![CDATA[Benny Arianto]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Waste Heat from cement kiln factories has begun developed to power generation in the world. Waste Heat Recovery Power Generation (WHRPG) is the one of power generation with use hot gas from cement kiln to increase water temperature in After Quenching Cooler (AQC) Preheater (SP) Boiler, and change water into superheated steam stage. Superheated Steam will delivery in to turbine and drive the generator. The quality of hot gasses will affect the turbine work and power generator. The temperature of hot gasses frequently at below 340°C. It will cause turbine not work in optimally condition. This research done for study using ammonia – water on kalina cycle at WHRPG to resolve the problem in WHRPG. From this study found that value of total exergy destruction at Steam Flash Cycle is 19,97 MW with power generator 7,011 MW. While at kalina cycle, total exergy destruction the kalina cycle is 18,33 MW with power generator at 8,459 MW.]]>
<![CDATA[A Mathematical Model of Desiccant Wheel in Desiccant Cooling ]]>
<![CDATA[Arfidian Rachman]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[The desiccant wheel performance of desiccant cooling system components is very important whose function is to regulate air humidity levels as well as to the capability, size and cost of the entire system. Mathematical models for predicting the performance of desiccant wheels in the development of mathematical models is one of the effective methods for analyzing the performance of wheel this moisture-reducing. This mathematical model can also be used in guiding system operation, delivering experimental results and automation in designing this cooling system. The purpose of this paper is to provide an overview of efforts to mathematically model the process of heat transfer and mass transfer that occurs in the moisture-reducing wheel. The desiccant wheel model built here is a gas and solid system including basic principles, heat and mass transfer mechanism and model building. The model is based on ideal assumptions, equations, additional conditions and the method of solution and also the main results. The gas-solid model is a more precise and more complex model than the other models. From these results the evolutionary process of the mathematical model is obtained and the aspects of calculation of pressure loss, air leakage, and optimal rotation speed of the drying wheel / dehumification.]]>
<![CDATA[Android-Based Control System of Lawn Mower Using Bluetooth Connection ]]>
<![CDATA[Asmara Yanto]]>;
<![CDATA[Anrinal Anrinal]]>;
<![CDATA[Prasetyo Subekti]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[The purpose of this research is to build and test the android-based control system of lawn mower using Bluetooth connection. The lawn mower has 4 DC motor actuators, where a DC motor for moving the rear wheels that serves to move the lawn mower back and forth, a DC motor to drive the front wheels that serves to turn the lawn mower, a DC motor to adjust the cutting blade elevation and a DC motor for turning the cutter blade. The four DC motors are controlled by a Arduino. The command or input to control the motion of the mower is sent via Android with a bluetooth connection to Arduino. The lawn mower control system testing is carried out to cut the grass. From the tests was conducted, it can be concluded that the lawn mower control system works well.]]>
<![CDATA[Design and Finite Element Analysis of Lawn Mower Machine ]]>
<![CDATA[Rozi Saferi]]>;
<![CDATA[Asmara Yanto]]>;
<![CDATA[Joko Sucipto]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Technological advances are now being found in everyday, one of them is an android smartphone. Android can be used to control motor speed without using cables with the help of microcontroller, motor driver and bluetooth module. In this study the autors designed and performed static analysis on the framework an android-based lawn mower using Autodesk Inventor. This grass cutting machine consists of several components, that is: framework, battery, microcontroller, motor driver, relay 5v, bluetooth module and others. The design result of an android-based lawn mower have a whole dimension with length = 298.89mm, width = 334.88mm and high = 241.02mm. After static analysis is carried out on the framework obtained results: Displacement minimum 0 mm and displacement maximum 0.0909735 mm, Safety factor minimum 1.93351 and safety factor maximum 15.]]>
<![CDATA[The Effect of Rambutan’s Leaf Extract Inhibitor on Corrosion Rate on Cast Iron Block Car Sedan Nissan in HCl Solution 1% ]]>
<![CDATA[Ismet Eka Putra]]>;
<![CDATA[Pren Tanjung]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Corrosion in cast iron can be overcome by rambutan counter measures (Nepheliumlappaceum L.). The object of the study which is placed in 1% HCl solution each of 3 specimens in 1 vessel. 12 specimens in 4 vessels. In this study, soaking iron cast iron car block Sedan Nissan without inhibitor and the variation of inhibitor 5%, 10%, and 15% with immersion time 5, 10, and 15 days. The solution is coincides with 0.095 m3/hr of passage in a vessel with a volume of 1% 900 ml of HCl. The highest corrosion rate in cast iron soaked in 1% HCl without using rambutan leaf extract and immersion time of 15 days is 0,075054 mpy. The lowest corrosion rate in cast iron soaked in 1% HCl solution using 15% rambutan leaf extract and a 15 day immersion time of 0,025863 mpy.]]>
<![CDATA[The Effect of Addition of Powder Areca Nut Midrib on Polyester Matrix to the Tensile and Bending Strength ]]>
<![CDATA[Hendriwan Fahmi]]>;
<![CDATA[Putri Pratiwi]]>;
<![CDATA[Tri Maryanto]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[In this life, humans certainly need a variety of equipment called material. In its development the material continues to experience progress as in early life, humans only use equipment made from simple materials such as wood, stone and others. Then move to the metal and the last to use a lot of mixture in the refinement of these materials, one form of mixed material created by humans is composite. Betel nut has a lot of powder, how to take it without damaging the areca nut plant. After the extraction of powder is applied to the areca nut, the fiber will be mixed with polyester resin as its matrix. Polyester resin is a matrix of composites. This resin is also included in thermoset resin. In the thermoset polyester the liquid resin is converted into hard and brittle solids formed by chemical cross-bonds that form very strong polymer chains. The mixture will produce composite materials which have different mechanical properties and characteristics from the forming material. Composite materials have the properties of conventional materials from the manufacturing process through inhomogeneous mixing. The purpose of this study was to determine the effect of adding areca nut powder to the polyester matrix on tensile and bending strength. Research and testing are carried out in several stages, including the manufacture of specimens. Both materials are stirred manually until both materials are fused evenly, then tensile and bending tests are carried out, data analysis and conclusions. The results of this research got the best tensile test values on composite polyester resin specimens and areca nut powder with a composition of 90%: 10% with a value of 5.09 MPa. And the results of bending which got the best bending test values are polyester resin composites and nutmeg powder with a composition of 90%: 10% with bending test values of 3.77 MPa.]]>
<![CDATA[Efficiency Analysis of NACA 4412 Semi-Inverse Taper Wind Turbine For Power Plant ]]>
<![CDATA[Sulaiman Sulaiman]]>;
<![CDATA[Asmara Yanto]]>;
<![CDATA[Ikhsan Febryan]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[In this work, a horizontal axis wind turbine (HAWT) are designed and tested to determine turbine efficiency. The wind turbine is built with 3 blades of semi-inverse taper type. This blade is a modification of a type of inverse paper blade that is called semi-inverse taper. This blade is made for moderate wind speeds considering wind in Indonesia. To analyze turbine efficiency, it is necessary to do turbine design and turbine testing stages. From the blade design, the blade radius is 0.9 m. Based on the results of testing and analysis of wind turbine efficiency it can be concluded that the input power and output power are higher with increasing wind speed. However, for the same wind speed, the output power is always smaller than the input power. The increase in input power due to an increase in wind speed is greater than the increase in output power to an increase in wind speed, so the efficiency is lower. The highest wind turbine efficiency was obtained at 84.97% at the lowest wind speed of 5.9 m/s. Whereas at the highest wind speed of 9.3 m/s, turbine efficiency is the lowest at 37.05%.]]>
<![CDATA[Experimental Study of Wet Cells HHO Generator using Galvanized Steel Plate Electrodes ]]>
<![CDATA[Putri Pratiwi]]>;
<![CDATA[Ahmad Fachrurrozi]]>
<![CDATA[ Jurnal Teknik Mesin (JTM) Vol 10, No 1 (2020) ]]>
Publisher : <![CDATA[LP2M - Institut Teknologi Padang ]]>
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<![CDATA[Requirements of fuel oil increases along with the increasing their consumption in many sectors such as transportation, industrial and others. This issue has attracted great reseacher’s attention to find the alternative solution as a substitute for fossil fuel energy. Oxygen Hydrogen Hydrogen gas (HHO) can be used as one of this solution. HHO gas can be produced using wet cell HHO generator type. The objective of this research was to construct a simple wet cell HHO generator system and determine the performance of this generator. We use galvanized steel pelate as electrode with thickness 1,2 mm, NaOH catalyst in the electrolyte solution. The results showed that the HHO gas maximum productivity of the cell was 0,0022 L/h, the highest efficiency was 11% with a power consumption of 69.3 Watts.]]>
