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Journal of Mechanical Science and Engineering
Published by Universitas Sriwijaya
ISSN : -     EISSN : 23549467     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Editors receive manuscripts in Mechanical Engineering from various academics, researchers and industry practitioners. The authors in the Journal of Mechanical Science and Engineering derived from various Higher Education institutions and national research institutes. Editorial Board of Journal of Mechanical stated that online media is both a scientific and specialized publishing scientific articles on original scientific research results (original) and review the field of mechanical engineering science. Publication covering area of research and review papers are as follows but not limitted to: Thermo-Fluid, ,Energy, Machine Design, Manufacture Engineering, Materials Engineering, etc
Arjuna Subject : -
Articles 40 Documents
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Mechanical Behavior of Medium Carbon Steel welded with SMAW And Corroded with Sea Water Diah Kusuma Pratiwi; Rasyidi Rasyidi
Journal of Mechanical Science and Engineering Vol 2, No 1 (2015): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

The problem of  metal corrosion is a very serious to be observed, especially the corrosion of medium carbon steel because it can reduce the economic value of the metal. Corrosion of carbon steel is influenced by the environmental conditions. This paper discusses the effect of the corrosion rate of medium carbon steel with SMAW welding and corrodes it with sea water during several hour. Electrodes of AWS A5.1E7016 type were used in the welding. The test results show that the medium carbon steel which was corroded with sea water has small weight loss. It seem that the weight loss has small influence on the mechanical behavior of the metal. For the welded medium carbon steel, the ultimate strength and surface hardness are smaller than the un-welded one. The microstructure of welded medium carbon steel has unsimilar structure with un-welded steel because it has about the same amount of ferlite, ferrite and martensite.
Characteristics of Mixture fuel of Biodiesel from Waste Cooking Oil and Solar used as fuel in Diesel Engine Susila Arita; Marwani Zahri Kadir; Siti Miskah
Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

Abstract Biodiesel from waste oil fried food out of fuel can be used as an alternative to replaced diesel fuel or diesel. Biodiesel blended with diesel (B0) at the level of a certain ratio so obtained B5, B10, B15 and B20 (B5 is a mixture of 5% biodiesel and 95% diesel, etc.) is used as fuel in diesel engines. Then tested for their physical properties such as heating value, cetane number, and flash point. Performance compared to diesel engines that use diesel engines (B0). Engine operated on constant engine revolution in 1500, 1750, 2000, 2250 and 2500 rpm. From the test results in fact indicate that the B5 fuel to obtain the best performance of the engine at 2000 rpm (engine revolution).. At this engine revolution produced the lowest specific fuel consumption of 0.34 kg / kWh, thermal efficiency of 24.02%  while the effective power on all fuels are the same ie 1:26 kw .   Keywords: Biodiesel, cooking oil, diesel fuel, diesel engine
The Records Of The Power Produce Of Solar Cell Of 50 Wp As Long As March 2016 At Kenten Area Darmawi Bayin
Journal of Mechanical Science and Engineering Vol 4, No 1 (2017): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

Solar cell of 50 WattPeak capacity is used on this research. The measurements are conducted for eight hours a day from 9.00 o’clock a.m. till 5.00 o’clock p.m.  This research is mainly aimed at to find out the electric power outcome of the solar cell at varies weather conditions in March of 2016 year. All of the equipments and measurements apparatus is stationed at Kenten BMKG Station of Palembang. The solar cell position is facing to the north at an angle of 10º. The total output of electric power is 4384,99 Watt and the total solar light intensity 134062,91 W/m² along March 2016. On full shinny and clear day the maximum power obtained is 49,2 W/hr and the sun light intensity is 1464,6 W/m². On cloudy day, the maximum power obtained is   42,8 W/hr and the sun light intensity is 1216,9 W/m². On rainny day the maximum power obtained is 34,1 W/hr and the sun light intensity is 1042,5 W/m². The results shown the relations between the power obtained and the light intensity, atmosfir temperatur and clouds in the sky
The Prototype of the Neo- heat exchanger from exchaust gas motor diesel Hatta Dahlan; Ahmad Darwis
Journal of Mechanical Science and Engineering Vol 3, No 1 (2016): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

The use of diesel motor  may be to increase  with the development of the medium industry in the last time. The energy crisis that befell the world industry still felt until this time while increasing energy consumption resulting in the ability of the electric power supplied by PLN still limited which culminated with the drop current (byar-pet) electricity.More information from this development diesel motor sales continues to increase and growing fast. Along with the luster of diesel engine appears in the new issue is the increasing air pollution coming out of diesel engines that have a negative impact on the surrounding environment.Heat exhaust gas from diesel motor still not useable diesel as an alternative energy source for heat boiler and other uses.This research done for exploiting the exhaust from diesel engines with prototyping appliance heat exchanger(heat exchanger) shaped double tubes 1 pass shell 2 pass tubes. The Neo-heat exchanger consists of a tube with a diameter of the jug 0.426 ft, long 1.48 ft. The diameter of the tube 0,032 ft, the length of the 1,148 ft .The total length of the tube 22,956 ft. The measurement was conducted with record gas temperature and heat out from diesel.,The results of this study found that the hot gas that comes out of the motor fuel is 183,608 F, hot gas that comes out of the prototype HE was 145,382F with energy fraction of heat 27.44 percent and heat efficiency of 67.5% in accordance with standard conditions.
The Influence of Matrix Banana Stem Fiber Volume Fraction Recycled Polypropylene (RPP) toward Bending Test Diah Pratiwi Kusuma; Hendri Chandra; Tumpal Ojahan Rajagukguk
Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

ABSTRAKSerat alam telah terbukti sebagai material yang kuat, mampu untuk menggantikan serat sintetik sebagai penguat. Serat batang pisang kepok yang memiliki kekuatan tarik 68,44 MPa dengan bundalan rata-rata 0,698 mm salah satu serat yang memiliki potensi sebagai penguat untuk polymer material komposit. Pada material komposit bermatriks recycled polypropylene (RPP) berpenguat serat batang pisang kepok dapat menahan beban yang diterima material komposit. Sedangkan recycled polypropylene (RPP) sebagai pengikat serat batang pisang, bekerja menahan beban dan melindungi serat dari kerusakan.  Hasil pengujian yang paling optimal terdapat pada volume fraksi 35% fiber : 65% matriks dengan  tegangan bending 122,09 N/mm2, modulus elastisitas 2975 MPa, momen bending 126,59 N/mm2 dan tegangan lentur 64,34 MPa. Pada pengamatan SEM fraksi volume 35% filler : 65% matriks paling optimal karena adanya ikatan matriks dan serat menyatu dengan sempurna. Dari penelitian ini dapat disimpulkan bahwa pengaruh fraksi volume serat batang pisang kepok sebagai penguat (fiber) dan recycled polypropylene (RPP) sebagai pengikat (matriks) pada material komposit akan mempengaruhi kekuatan material komposit lebih kuat dan getas. Apabila ditinjau dari keseluruhan pengujian yang dilakukan maka fraksi volume yang paling optimal terdapat pada fraksi volume 35% filler : 65% matriks.
Performance Evaluation Of Feed And Recycle Gas Chiller Influence On Environmental Conditions In The Production Process Plant Astuty Astuty
Journal of Mechanical Science and Engineering Vol 3, No 2 (2016): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

Heat transfer by convection is strongly influenced by the geometric shapes of heat exchangers and three dimensionless number, the Reynolds number, Nusselt number and Prandtl number with the environmental conditions of the surrounding air. Any environmental influences cause actual results and theoretical conditions differ. This is one of the problems at the plant in the production process results, especially the heat exchanger type of chiller. In this paper aims to determine the impact of the ammonia production process of the influence of changing environmental conditions and to apply the concept of heat and mass transfer in the Chiller as knowledge development models ammonia optimum production equipment in the ammonia. In this study, measurements were performed during the morning, afternoon, evening, and night on normal weather and rain by using thermo-anemometer and thermo-hygrometer. The results showed an increase in heat during heavy rains and decrease the heat when the normal environmental conditions. With the highest increase in the heat on the morning of 14 July 2015 where the air temperature was recorded at 26.3 ℃, the speed of 6.79 m / s, the air flow rate of 19 688 Watt heat and mass flow rate of the ammonia evaporates increased 49.797 kg / h to with 50.368 kg / h. Mass flow rate that evaporates due to the heat transfer air is not decreased by more than 1% despite the chiller effectiveness decreased from 90.422% to 61.259% due to boundary conditions which allowed fouling factor.
Study On The Experiment of Medium Carbon Steel Welded With Smaw and Quenched With Sea Water Erizal .; Diah K Pratiwi
Journal of Mechanical Science and Engineering Vol 2, No 2 (2015): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

Abstract. This research was conducted to find the effect of sea water cooling media on mechanical properties and physical properties of the medium carbon steel welded SMAW. Testing performed on two types of specimens were medium carbon steel welded and non-welded, quenching performed at temperatures of 850ºC, then tested the hardness, tensile strength and microstructure . The results of the study of media of sea water cooling on mechanical properties of carbon steel welded medium SMAW on tensile test is known.  the average tensile ductility in the welded specimens is lower than that is not welded. In both specimens were quenched welded and non-welded experienced an average increase in tensile ductility . However, the average value of tensile ductility  on welded specimens and quenched lower than that is not welded. In the hardness test show the increase of average of hardness against Vickers. Likewise welded specimens and quenched on average HAZ area hardness, whereas in the weld area is not quenched hardness higher than that is not welded. However, welded is lower  the hardness quenched specimens quenched and not welded. Test results on the microstructure of specimens made quenching the metal HAZ area was clear and its martensite Ferrite grain boundaries and the area looks ferrite weld metal and its martensite dominant.
Influence of Blending of Diesel Certified and Biodiesel CPO on Efficiency of 60 MMT SB Boiler Type Novia Sumardi; Ellyanie Ellyanie; Rosdiana Moeksin
Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

Abstract Combustion is the process of mixing  oxygen and carbon in speed and produces heat. Oxygen  from the air, while carbon derived from fuel. Combustion  boilers as a chemical process of unification of the fuel and oxygen from the air with the speed of a particular reaction that produces energy. Calculation of the combustion process is the starting point  the design of boilers, furnaces and other appliances that generate heat from the combustion process derived from the number of elements involved in a chemical reaction, the amount of heat generated and the efficiency of combustion. The fuel is a mixture of diesel and biodiesel certified crude palm oil, ratio B0, B5, B10, B15, B20, B30 testing using Fire Tube BoilersSB60MMT. From the ultimate analysis and dry flue gas emissions (gas Analyzer), then calculated based on stoichiometric combustion and efficiency using the indirect method, the calculation results obtained from the more mixed crude palm oil biodiesel is added then the content of SO2, CO, NOx  increasingly reduced. Also obtained the largest heat loss due to dry flue gas and 8,209% heat loss due to evaporation of water formed in  H2 fuel efficiency of 7,002% to 85.637% on the  blend B20. Keywords: Solar Certified, CPO Biodiesel, Fire Tube Boilers, Emissions, Effici
The Effect Of Sinking Parameters To Optimize Response At Edm Of Aisi H13 Using Taguchi – Fuzzy Method Diah Kusuma Pratiwi
Journal of Mechanical Science and Engineering Vol 4, No 1 (2017): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

The development technology in today's manufacturing is very fast, the desire of the market will need products and components with complex shapes and a high level of accuracy as well as hardness material which has high strength. High degree of hardness and precision widely used non-conventional sinking of EDM. End cutting depth (CDE), the maximum rate of erosion material(REM) and rate of electrode wear (RWE) as well as minimal surface roughness (SR) is the performance of the process of machine sinking EDM to be achieved. Aims of a study conducted to determine the contribution of the process parameters in order to reduce the variation of response parameters simultaneously and determine the value of setting the appropriate parameter process. The parameters were varied current, on time, off time and machining voltage. This research used experimental design of Taguchi method with orthogonal matrix L16 44. Combination of Taguchi-Fuzzy is used as a method of optimization by experimenting as much as two times. Optimization results show the contribution of each parameter on all responses simultaneously is current at 41.35%, energy on time amounted to 37.90%, off time amounting to 10,11%and machining voltage by 5%. End cutting depth (CDE) with a specific target, the maximum rate of erosion material (REM), ), the rate of wear of the electrode (RWE) and the surface roughness (SR) are both derived parameter value of at least current, 15A the energy on time 300ìs, off time 5ìs and machining voltage of 12V.
The Effect of Fluid Flow Current to 30º Blades Achard Turbine Performance Muhammad Faizal; Dodi Tafrant
Journal of Mechanical Science and Engineering Vol 3, No 1 (2016): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

Achard turbine is one kind of vertical axis water turbine that can use to low head water current. Achard turbine can use to river flow or irrigation canal. This is will make an additional function of river and irrigation canal to be a renewable energy resource. The experiment use three blades NACA 0020 Achard turbine in the irrigation canal at Belitang District, West Ogan Komering Ulu. The flow current is 0.55 m/s, 0.61 m/s, and 0.71 m/s. The result shows increasing of CP and CT by increasing of flow current. Maximum CP is 0.1797 at flow current 0.71 m/s. Maximum CT is 0.206 at flow current 0.71 m/s.

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