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Journal of Energy, Mechanical, Material and Manufacturing Engineering
Published by Universitas Muhammadiyah Malang
ISSN : 25416332     EISSN : 25484281     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Journal of Energy, Mechanical, Material and Manufacturing Engineering Scientific (JEMMME) is a scientific journal in the area of renewable energy, mechanical engineering, advanced material, dan manufacturing engineering. We are committing to invite academicians and scientiests for sharing ideas, knowledges, and experiences in our online publishing for free of charge. It would be our pleasure to accept your manuscripts submission to our journal site.
Arjuna Subject : -
Articles 14 Documents
 1   2 
Search results for , issue "vol. 6 no. 2 (2021)" : 14 Documents clear
The Effect of Nitrogen on Methane Gas Flame Propagation Characteristic in Premix Combustion Djoko Wahyudi; Dani Hari Tunggal Prasetiyo; Alief Muhammad
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i2.16164

Abstract

The electric engine is a serious opponent of the fuel engine. However, this does not mean that fossil fuels should be abandoned, but rather makes it a great challenge and a strong reason to develop fossil fuels to be even more efficient. Increasing the combustion efficiency of the current fuel engine can be done in various ways and methods. One of the many ways to increase combustion efficiency in terms of fuel is by mixing the fuel with other compounds. This article examines the effect of mixing variations of methane gas with nitrogen gas. The flame propagation speed in the midpoint of the mixture of stoichiometry (methane-air) and Nitrogen (N2) on the top ignition is 2233.33 mm/s at N2 10% of the third frame and at lower ignition, the speed is 3550.03 mm/s at N2 20% of the second frame. In addition, the bottom ignition experiment has a very large effect on maximizing the speed of flame propagation, especially in the 20% N2 sample. Therefore, the highest improvement in combustion efficiency is obtained by using a 20% N2 mixture and at the bottom ignition condition.
Microstructure and Mechanical Properties of a Partially Recrystallized Aluminium Alloy having Varying Cu/Mg Ratio Md. Jasim Uddin; Hossain Rashed
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i2.16587

Abstract

Heat treatable Al-Zn-Mg-Cu alloys are widely used in automobile industries, aerospace and military applications. This study investigates the effects of different amounts of copper and magnesium on microstructure and mechanical properties. The as-cast alloys prepared in a permanent mould showed a dendritic microstructure and the intermetallic phase surrounded by secondary phases. As-cast microstructure was refined substantially during hot rolling processes. The ultimate tensile strength and hardness values both in hot-rolled and aged conditions along longitudinal and transverse directions were found greater for the alloy containing 1.33 wt.% copper and 1.01 wt.% magnesium, whereas strain to fracture values for alloy 01 with 1.09 wt.% copper and 1.8 wt.% magnesium. The fracture surface of the tensile sample having relatively lower amount of copper content revealed dimple rupture behaviour, while higher 4.32 wt.% copper content indicated transgranular and cleavage fracture. A similar pattern was also observed along the transverse direction. Overall, copper appeared to be more effective in strengthening of the studied alloys.
Application of RSM Method in Optimization of 3D Printing Machine Process Parameters Using Biocomposite Materials (PMMA/Hydroxyapatite) to Get the Highest Tension Strength Angger Bagus Prasetiyo; Kartinasari Ayuhikmatin Sekarjati; Alva Edy Tontowi
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i2.17780

Abstract

Solution developed to improve the structure of human bone in synthetic bone. Composites manufactured from polymethylmetacrylate are frequently employed in the medical field (PMMAPure PMMA, on the other hand, has restricted mechanical qualities, as well as being less compatible, rigid, and non-bioactive. This research will mix PMMA material with hydroxyapatite (HA) material. The material's composition is PMMA: MMA = 1: 1, with a hydroxyapatite (HA) to PMMA powder ratio of 0.50: 1 (w/w). The material will be printed through a 3D Printing machine which has a 1.5 mm nozzle. This 3D Printing machine undergoes periodic development, but the results obtained are not in accordance with the needs, especially the tensile strength of the specimen. Therefore, it is necessary to conduct research to determine the ability of the 3D Printing machine printing process by optimizing the parameters of the 3D Printing machine. Experimental results and analysis using the RSM method show the machining parameters of the 3D printing machine on PMMA/HA material to get the highest optimal tensile strength at the point of 13,670 mm/s for the perimeter speed parameter, 76,330 mm/s for the infill speed parameter and 33,670% point for the fill density
Pitch ratio effect on the effectiveness of condenser for essential oil distillation Nicolas Titahelu; Jonny Latuny; Cendy Sophia Edwina Tupamahu; Sefnath Josep Etwan Sarwuna
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i2.19006

Abstract

This research is focused on the usage of the helical coil pipe to shorten the distillation time which then aimed to obtain a helical coil pipe condenser configuration with an effective pitch ratio to shorten the distillation time. The pitch ratio value is varied from 2.10 to 4.20. The experimental results show that the effectiveness of the condenser decreases as the pitch ratio increases, where the maximum effectiveness at the pitch ratio of 2.10 is 74.13%, while the minimum pitch ratio of 4.20 is 67.19%. The maximum effectiveness is obtained at a pitch ratio of 2.10 due to a larger heat transfer contact area which results in an increase in the actual heat transfer as well. The experimental results with a pitch ratio of 2.10 obtained a condensate temperature of 37.29 °C which is 22.71 °C and a distillation time of only 2 hours compared to the results of the straight pipe condenser used by the SME group. The effect of the helical coil pipe pitch ratio obtained from the experimental results with a mean deviation value of 2.81% compared to the numerical study. It is concluded that the maximum condenser effectiveness is at the minimum pitch ratio value and then the pitch ratio of 2.10 can be used for the clove essential oil distillation process.
Prediction Coefficient of Pressure and Wall Friction for Turbulent Flow over a Backward Facing Step Zaid Al Kahfi Ramadhan; Mohamad Yamin
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i2.19250

Abstract

Backward Facing Step(BFS) has been widely recognized for its application to turbulence fields in deep flow. The flow separation occurs due to a sudden change in geometry. To know the phenomenon of flow in BFS can be done with a numerical approach. In some cases, numerical studies have a weakness in the computational time aspect. This study focuses on the prediction of Cp and Cf on BFS flow using Machine Learning. It begins with a meshing sensitivity approach with the number of elements as much as 22188 cels in a numerical simulation with a step height of 12.7 mm. This numerical study will be carried out using Reynolds number in the turbulent region of Re 36000. The turbulent k-omega shear stress transport model was used to perform numerical simulations in the open-source software package OpenFOAM®. Simulation data in the form of speed and pressure at each node that represents the form of turbulence is used as a dataset in Machine Learning. Three Machine Learning models, namely Multi-Layer Perceptron, RandomForrest, and Multiple Linear Regression are used to predict Cp and Cf. The effectiveness of each of these models is -101.5% for Multi-Layer Perceptron, 96% for RandomForrest, and 99% for Multiple Linear Regression. With the best effectiveness value, the Machine Learning Multiple Linear Regression model is used to get the predicted Cp and Cf values ​​from variations in step height of 9.525 mm, 6.35 mm, and 3.175 mm. With these results, it shows that the Machine Learning model can be used to predict the BFS turbulence flow obtained from the results of the OpenFoam® numerical approach.
Design of Hollow Cone Water Gate with Hydraulic System in Karangkates Dam Mulyono; M Irkham Mamungkas; Candra Dwi Febrian
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i2.19461

Abstract

Water gate system in a dam is to control the water flow. It also controls the water surface elevation being stored or routed. The hollow cone type was designed as it has the most efficient energy of dissipation. It also has a simple construction, a relatively affordable cost, and it can be operated electromagnetically or in the hydraulic system. The hollow cone design gives a stable debit coefficient and can be implemented on a big scale. The method used in this design is the data collection and calculation of dimension scale and water gate capacity. The result of the calculation determined the capability of the hollow cone water gate to control the maximum debit of 5,9251 m³/s, the operation load of 2.875,92 kg, tensile stress around the valve 2,0108 kg/mm2. The design of the hollow cone system used the SC30C of the M20 nut.
Analysis of Composite Mechanical Strength from Waste Chicken Feather and Sawdust Aswan Munang; Achmad Zaki Yamani
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i3.15470

Abstract

The objective of the study is to determine the mechanical strength of chicken feather and sawdust waste in making biocomposites. The use of natural fibers because they are cheap and environmentally friendly. Preparation of biocomocytes with several folume fractions. The volume fraction to be researched is 80%, 20%, 0%, 80%, 15%, 5%, 80%, 10%, 10%, 80%, 5%, 15%, 80%, 0%, and 20%. Biocomposite testing with ASTM E8 specimen standards for tensile testing with a universal testing machine. Impact testing with ASTM E23 specimen standards with an impact testing machine. From the test results, it can be seen that the volume fraction of 80%, 15%, 5%, has the highest tensile strength with 6,390 MPa. Tensile test at a volume fraction of 80%, 15%, 5%, with an impact strength of 0.731 joules. From the research results, it can be concluded that the same volume fraction as the tensile and impact test has a high mechanical strength. The use of the dominant fiber does not affect its mechanical strength. The combination of natural fibers and polymers used will affect its mechanical strength.
The Effect of Wire Straighness Electric Current Variation on Size Diversion and Rude of The Cutting Current Profile of Medium Carbon Steel Dental from Wire (EDM) Anang Subardi; Aladin Eko Purkuncoro; Achmad Taufik
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i3.16403

Abstract

Wire Electric Discharge Machine (EDM) is a non-conventional metal cutting machine. This machine is commonly used to form machine components that have complex shapes and require high precision. Not many conventional and non-conventional machines are capable of producing small module gears. The cutting groove occurs from the erosion of the electric spark by the electrode wire moving from the coil of wire and forming or cutting the workpiece. One of the machining parameters that determine the quality of the product on an EDM wire is Current. So this study aims to determine the deviation of the gear profile cutting groove and the roughness that occurs in the straight gear profile cutting groove from the results of the Wire EDM process. In this thesis research, the varied parameters are electric current. The current used is 6 A, 7 A, 8 A, 9 A 10 A. The results of this research show that the current 6 A has an average deviation value of 0.0228 mm. At current 7 A has an average deviation value of 0.0255 mm. At current 8 A has an average deviation value of 0.0275 mm. At current 9 A has an average deviation value of 0.0313 mm. And at a current of 10 A has an average deviation value of 0.0362 mm. At current 6 A has an average roughness value. At current 7 A has an average roughness value. At current 8 A has an average roughness value. At current 9 A has an average roughness value. And at current 10 A has an average roughness value. This is due to the greater use of an electric current at the electric voltage, which will cause the sparking to get bigger too, this causes the movement of the electron flow to hit the surface of the workpiece faster, resulting in an increase in temperature which results in erosion of the workpiece surface. , this will change the result of the cut which affects the size precision and roughness of the wire EDM.
The Variation of Fuel Mixture of Pertalite and Corncob Bioethanol on Engine Performance Yuniarto Agus Winoko; Zulfikar Jabbaruddin Al Jihad Zulfikar; Umi Anis Ro'isatin
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i3.17779

Abstract

Year by year, fossil fuels start to run out due to the increasing marketing of fuel due to the increasing number of vehicles in Indonesia. It is proven by the increase in fuel prices in Indonesia, which means that the available oil is running low. To overcome the excessive use of fossil waste, researchers use alternative materials which are recycled from waste or commonly called bioethanol. The purpose of making a fuel mixture is that in addition to materials that are easily available, bioethanol does not damage the surrounding environment because it uses materials that do not contain harmful substances, which can be recycled such as fruit peels or plant waste. The study method used is experimental, using a Yamaha Force 115cc motorcycle. Data is obtained directly by observing the analysis of experimental results and then concluding in the form of graphs and tables. This test uses a dynamometer to determine the power and torque produced, while for testing the rate of fuel consumption using a measuring burette, then the calculation of fuel consumption is carried out. The results showed that there were differences in power, torque, Bmep and fuel consumption produced by variations in fuel. For maximum power produced on E15 fuel of 6.47 hp and a maximum torque of 5.16 Nm. For the lowest power produced on E20 fuel of 5.67 hp and the lowest torque of 4.39 Nm. The lowest fuel consumption was found in the use of E10 fuel of 0.000338 kg/hP while the highest fuel consumption was produced by E20 fuel of 0.0000406 kg/hP. For the highest Bmep on E15 fuel of 11.91 Psi and the lowest on E20 fuel of 11.39 Psi.
The Effect of Copper (II) Nitrate Addition and Tensile Stress on SCC of C44500 Material Tube Farhan Adi Farrasandi; Firmansyah Sasmita; Husaini Ardy
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol. 6 No. 2 (2021)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/jemmme.v6i3.19827

Abstract

The heat exchanger is an intermediary for two or more fluids that flow both inside and outside of the heat exchanger to distribute heat. This process was aimed to increase efficiency levels in the process industry. One of the suitable materials for the tube is UNS C44500, also known as admiralty brass consists of 70Cu-30Zn, which has high thermal conductivity and good corrosion resistance. However, admiralty brass was susceptible to stress corrosion cracking (SCC) when faced with nitrate since the tube was also loaded by internal stress. Moreover, SCC was also exacerbated by dezincification. The C-ring test method examined the effect of nitrate compounds and dezincification on SCC in C44500 Tube components. Tensile stresses varied between 15, 45, and 85% of yield strength, which were immersed into nitrate solutions consisting of NaNO3 and Cu(NO3)2. Some specimens were washed using 20% ​​HCl to bring up dezincification. The results obtained that SCC occurred at the highest Cu(NO3)2 concentration, identified by longitudinal crack and passivity breakdown. All of the dezincified specimens were found cracked due to SCC after immersion into 1 M Cu (NO3)2, while un-dezincified were failed when given tensile stress between 45% to 85% of maximum yield strength.

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