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INDONESIA
Jurnal Energi Dan Manufaktur
Published by Universitas Udayana
ISSN : 23025255     EISSN : 25415328     DOI : -
Core Subject : Science, Engineering,
Energy Industrial & Manufacturing Engineering
"Jurnal Energi dan Manufaktur" is a journal published by Department of Mechanical Engineering, University of Udayana, Bali since 2006. During 2006-2011 the journal's name was "Jurnal Ilmiah Teknik Mesin CAKRAM" (Scientific journal in mechanical engineering, CAKRAM). "Jurnal Energi dan Manufaktur" is released biannually on April and October, respectively. We invite authors to submit papers from experimental research, review work, analytical-theoretical study, applied study, and simulation, in related to mechanical engineering (energy, material, manufacturing, design) to be published through "Jurnal Energi dan Manufaktur".
Arjuna Subject : -
Articles 387 Documents
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Studi Hubungan Struktur Mikro dan Keaktifan Zeolit Alam Akibat Proses Pengasaman Made Cuaca Vahindra Suriawan; Tjokorda Gde Tirta Nindhia
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Natural zeolite is known as metal pollutant adsorbent in industrial waste treatment. As initial study for utilization ofnatural zeolite from Indonesia for metal pollutants adsorbent in liquid waste, then the physical properties should berecognized first. Activation is the first step in order to the natural zeolite able to adsorb the metal pollutants in the waste.One method to activate is by applying acid solution such as sulfuric acid (H2SO4) to activate the natural zeolite. The purposeof this research is to observe the change on microstructure of natural zeolite obtained from the mining at Tasikmalaya, WestJava, Indonesia due to chemical activated, to be compared to one without chemical activation. The variation of concentrationof H2SO4 namely: 2 4 , 6, 8, and 10 % , with 30 minutes soaking time , in a room temperatur. The microstructure then isobserved by using optical microscope following standard for ceramography. The change in microstructure then is analyzedand studied to be related with the ability of natural zeolite in adsorb the metal pollutant. The level activity of the zeolite canbe recognized by measuring its porosity.
Komposit Epoksi Diperkuat Serat Corypha Utan: Karakterisasi Morpologi, Kekuatan Tarik Dan kekuatan Lentur Nasmi Herlina Sari; Agus Dwi Catur; Ahmad Safii
Jurnal Energi Dan Manufaktur Vol 12 No 1 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (369.997 KB) | DOI: 10.24843/JEM.2019.v12.i01.p05

Abstract

Serat Corypha utan lamarck, yang kaya selulosa, murah, berlimpah memiliki potensi untuk penguatan pada komposit termoset. Penelitian ini bertujuan untuk menyelidiki sifat-sifat dari komposit epoksi berpenguatan serat Corypha utan lamarck. Pembuatan komposit telah dilakukan dengan menggunakan teknik vacuum bagging. Efek penambahan fraksi volume serat Corypha Utan (CU) dengan variasi 20, 25 dan 30 % (fraksi volume) terhadap morpologi, sifat kekuatan tarik dan lentur dari komposit telah diselidiki dan dianalisa. Hasil studi menunjukkan bahwa penambahan fraksi volume serat Corypha Utan secara siknifikan meningkatkan kekuatan tarik dan lentur dari komposit; dikarenakan penyebaran serat merata dalam resin, dan interface yang cukup kuat terbentuk antara serat dan epoksi. Komposit CU/epoksi dengan variasi fraksi volume serat 30% (spesimen komposit CUh) memiliki nilai kekuatan dan modulus tarik sebesar tur paling tinggi sebesar 28.13 MPa dan 39.40 MPa, berturut-turut. Modulus lentur paling tinggi dimiliki oleh komposit dengan fraksi volume serat CU sebesar 30%. Analisa foto SEM memperlihatkan ikatan interface antara serat-epoksi dan fiber breakage. Hasil ini menunjukkkan bahwa komposit Cu/epoksi dapat menjadi alternatif sebagai papan komposit komersil. Corypha Utan fiber, which is rich cellulose, cheap and abundant has the potential for reinforcement in thermoset composites. This study aim is to investigate the properties of epoxy composites reinforced Corypha Utan fibers. The manufacture of composite has been done using vacuum bagging technique. The effect of increasing of the volume fraction of the Corypha utan fibers with variations of 20, 25 dan 30 % (volume fraction) on morphology, the tensile and flexural strength of composites have been investigated and analyzed. The results show that the increase of the volume fraction of Corypha utan fibers significantly increased tensile and flexural of composites; it is due to the dispersion of the fibers in epoxy, and interface bond between fiber and epoxy formed strong enough. The CU/epoxy composite with the volume fraction of the fiber of 30% (Composite CUh specimens) has the highest tensile and flexural strength value of 28,13 MPa and 39,400 MPa, respectively. The moduli’s flexural gives higher value at 30% volume fraction. SEM images demonstrate that interfacial adhesions between fiber-epoxy, and fiber breakage. The result suggests that Corypha utan fibers/epoxy composites can be a good alternative as commercial composites boards, especially for interior applications.
Analisa Performa Mesin dengan Biodiesel Terbuat dari Virgin Coconut Oil pada Mesin Diesel Annisa Bhikuning
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

AbstrakIndonesia membutuhkan energi yang setiap tahun semakin meningkat sedangkan penemuansumber minyak baru sangat sedikit. Hal ini mengakibatkan Indonesia saat ini menjadi negaranet importer energi. Untuk mengatasi hal ini pemakaian energi alternatif harus dipacu. Salahsatu energi alternatif yang sangat menjanjikan adalah konversi minyak nabati menjadi bahanbakar diesel. Salah satu sumber energi yang dapat dipakai untuk menggantikan bahan bakardiesel adalah biodiesel. Pada penelitian ini, dianalisa performa mesin dengan menggunakanbiodiesel yang terbuat dari minyak kelapa murni atau VCO. Pada pembuatan biodieseldigunakan katalis berbeda yaitu KOH dan NaOH. Penelitian dilakukan dengan denganmenjalankan mesin diesel satu silinder selama satu jam pada 1500 rpm dengan tanpa beban,beban 20%, beban 40%, beban 60% dan beban maksimum (80%). Bahan bakar yangdigunakan yaitu bahan bakar solar, VCO katalis KOH (100%VCOKOH), VCO katalis NaOH(100%VCONaOH), VCO katalis KOH sebanyak 20% dicampur dengan 80% solar(20%VCOKOH), dan VCO katalis NaOH sebanyak 20% dicampur dengan 80% solar(20%VCONaOH). Hasil performa mesin menunjukkan bahwa pada beban maksimum,20%VCONaOH dapat menekan opasitas sebesar 30% dibandingkan solar. Pada bebanmaksimum 20%VCONaOH dapat menekan opasitas sebesar 33,15% dibandingkan dengan100%VCONaOH. Angka setane yang dihasilkan menunjukkan bahwa biodesel dari VCOmemiliki angka setane masih dibawah nilai 40 sedangkan VCONaOH angka setanenya lebihtinggi 3.06% dibandingkan biodiesel VCOKOH.Kata kunci: Biodiesel, angka setane, performa mesinAbstractIndonesia is one of the country that consume higher in energy. Nevertheless, currentlyIndonesia is still become a net importer of energy. To overcome this, the use of alternativeenergy should be encouraged. One of the most promising alternative energy is the conversionof vegetable oils into diesel fuel. One of the sources of energy that can be used to replacediesel fuel is biodiesel. In this study, the engine performance of Biodiesel made from virgincoconut oil (VCO) had been analyzed. Biodiesel VCO used two catalysts, named KOH andNaOH. Experiment was conduct in a single -cylinder diesel engine for one hour at 1500 rpmwith no load , 20 % load , 40 % load , 60 % load and maximum load ( 80 % ) . The fuels werediesel fuel as a datum , VCO catalyst KOH ( 100 % VCOKOH ) , VCO catalyst NaOH ( 100 %VCONaOH ), VCO 20 % and KOH catalyst blended with 80 % diesel fuel ( 20 % VCOKOH ) ,VCO 20 % NaOH catalyst blended with 80 % diesel fuel ( 20 % VCONaOH ). As the results, theperformance of the engine can be seen in the maximum load , 20 % VCONaOH can reducedthe opacity by 30% compared to diesel fuel. In maximum load, 20 % VCONaOH can reducedthe opacity up to 33.15 % compared with 100 % VCONaOH. In cetane numbers , biodieselsfrom VCO is still below of 40. And the cetane number for VCONaOH is higher 3.06 % thanbiodiesel VCOKOH .Keywords: Biodiesel, cetane number,engine performance
STUDI EKSPERIMENTAL ORIFICE FLOW METER DENGAN VARIASI TEBAL DAN POSISI PENGUKURAN BEDA TEKANAN ALIRAN MELINTASI ORIFICE PLATE Nata Septiadi Wayan
Jurnal Energi Dan Manufaktur Vol 3, No.1 Juni 2008
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Pengujian orifice flow meter telah dilakukan dengan menggunakan plat orifis dan pipa berbahan akrilik. Plat orifis dibuat dengan memberikan sedikit bevel pada bagian sisi masuknya dengan rasio diameter (?) = 0.5; 0.6; dan 0.7 dengan tebal plat orifis 10 mm dan 20 mm. Pengujian dilakukan dengan rentang kapasitas aliran yang memiliki bilangan Reynolds ± 9333.33 sampai ± 28000. Pengujian dilakukan dengan mengalirkan air melintasi plat orifis. Kapasitas aktual dari orifice flow meter dapat diukur pada V-notch weir dan sight glass. Sedangkan untuk kapasitas teoritis dari orifice flow meter dapat dihitung dengan menggunakan persamaan kontinuitas dan persamaan Bernoulli yang dimodifikasi. Hasil penelitian menunjukkan bahwa prosentase irrecoverable pressure drop semakin turun jika kapasitas aliran semakin besar. Pada rasio diameter (?)= 0.7 tebal 10 mm irrecoverable pressure drop terhadap maximum pressure drop mencapai nilai yang cukup rendah yaitu (<40%) pada bilangan Reynolds ±13000 sedangkan untuk orifice flow meter yang tebalnya 20 mm pada rasio diameter (?)= 0.7 irrecoverable pressure drop terhadap maximum pressure drop mencapai nilai yang cukup rendah yaitu (<40%) pada bilangan Reynolds ±15000. Cd (discharge coefficient) untuk orifice flow meter yang tebalnya 10 mm berkisar antara 1.17÷0.88 dan tebal 20 mm nilainya berkisar 1.048÷0.94 dengan nilai untuk rasio diameter 0.5 semua lebih besar dari1. Nilai ini menyerupai nilai Cd nozzle namun trend atau fluktuasinya masih tetap seperti trend orifice flow meter. Sedangkan posisi pengukuran yang menghasilkan kapasitas teoritis yang paling mendekati kapasitas aktualnya adalah yang menggunakan posisi pengukuran D - 0.
Drag Reduction Suspensi Bakteri Selulosa pada Aliran Crude Oil dalam Pipa Spiral Yanuar Yanuar; Kurniawan Kurniawan; Rendi Rendi; Habib Habib; Edwin Edwin; Vaul Vaul
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Pressure drop adalah salah satu aspek penting yang mempengaruhi konsumsi energi yangdigunakan dalam suatu transportasi fluida menggunakan pipa. Drag Reduction Agent (DRA)merupakan salah satu alternatif untuk mengurangi timbulnya pressure drop pada aliran fluidadalam pipa dengan menambahkan sejumlah zat aditif kedalam aliran. Zat aditif yang digunakandalam penelitian ini berupa fiber bakteri selulosa. Penelitian ini bertujuan untuk mengetahuikarekteristik drag reduction dalam aliran minyak mentah (crude oil) dalam pipa spiral denganrasio P/Di 7.6. Re= 10^3 - 5.10^4. Dalam penelitian ini juga digunakan pipa bulat dengandiameter 17 mm sebagai pembanding. Penambahan bakteri selulosa dengan konsentrasi 250ppm, 500 ppm, dan 750 ppm pada aliran crude oil dapat mengurangi drag pada pipa spiralataupun pipa bulat. Drag reduction pada pipa bulat sebesar 15 % dan pada pipa spiral 13 %.Kata kunci : Pressure drop, bakteri selulosa, crude oil, pipa spiral.Pressure drop is one of the important aspects that influence the energy consumption used in atransport fluid using a pipe. Drag Reduction Agent (DRA) is one alternative to reduce theoccurence of pressure drop in the fluid flow in a pipe by adding additives into the flow. Additivesused in this study is bacterial cellulose fiber suspension. This study aims to determine thecharacteristics of drag reduction in the flow of crude oil in a spiral pipe with the ratio P/Di 7.6.Reynolds number was 10^3 - 5.10^4. In this study also used a circular pipe with a diameter of17 mm for comparison. The addition of bacterial cellulose with a concentration of 250 ppm, 500ppm, and 750 ppm in the crude oil flow to reduce drag in spiral pipe or circular. From thisresearch, the drag reduction on circular pipe by 15% and 13% in the spiral pipe.Keywords : Pressure drop, bacterial cellulose, crude oil, spiral pipe
Pengaruh Temperatur Operasi Dan Kecepatan Superfisial Terhadap Komposisi Gas Produser Pada Gasifikasi Fluidized Bed Berbahan Bakar Sampah Terapung I Nyoman Suprapta Winaya; Made Sucipta; I Dewa Made Susila
Jurnal Energi Dan Manufaktur Vol 5, No.1 April 2011
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Management of waste into energy that is economically possible with fluidized bed gasification technology. Gasification is athermo-chemical process that converts biomass/solid waste into producer gas (CO, H2, CO2 and HC) by using air, steam, oxygenor its mixtures as a gasification agent. In a study of floating waste fuel gasification in pellet form with 1,25 cm diameter and 1.25cm height and of 1.22 gram mass, where is used oxygen enriched air as gasification agent. The operating temperature (Top) atreactor selected 500oC and 600oC with superficial velocities (Uo) are 0.105 m/sec, 0.125 m/sec, 0,145 m/sec., and 0,165 m/sec.From the research results showed that by increasing the operating temperature of 500oC to 600oC and increasing the superficialvelocity of 0.105 m/sec to 0.125 m/sec, did not influence directly the increasing of percentage/levels of CO, CO2 and HC gas thatproduced.
Pengaruh variasi kuat arus dan kecepatan pengelasan terhadap sifat mekanik hasil pengelasan SAW plat baja SS41 grade A IN Budiarsa; IGN Nitya Santhiarsa
Jurnal Energi Dan Manufaktur Vol 1, No 1 Juni 2006
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Welding is a method used to joint metal or metal alloy that take heat energy from welding machine. On welding process, there is occurred the fusion between base metal with filled metal. In base metal, there is founded heat affected zone(HAZ) which to go throw heating and cooling cycles that produce the changes of microstructure of metal so that make mechanical behavior of material changes. This research discuss the affect of variation of electric current and welding speed on mechanical behavior of steel plate SS41 Grade A, that is for understanding the changes of toughness caused by welding process, so then could choice the right parameter welding and know the changes of material toughness. The method that used in this research is factorial experiment with two factor are electric current and welding speed. Based on research results, both of electric current and welding speed have real impact for toughness, where electric current more and more high make toughness decrease, afterward, welding speed more and more high make toughness increase.
Analisis Kegagalan Korosi pada Tangki Penyimpan Air Panas Terbuat dari Baja Nirkarat Tjokorda Gde Tirta Nindhia; I Putu Widya Semara; I Wayan Putra Adnyana; I Putu Gede Artana
Jurnal Energi Dan Manufaktur Vol 7 No 1 (2014): April 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak : Suatu tangki penyimpanan air panas yang dalam kasus ini terbuat dari baja nirkarat (stainless steel)mengalami kegagalan karena korosi terutama pada bagian sambungan las. Korosi juga terjadipada bagian bawah tanki. Tanki telah digunakan kurang lebih di bawah satu tahun namun sudahmengalami korosi parah terutama pada bagian sambungan las dan juga mengalami korosi padabagian bawah. Penelitian ini bertujuan mengetahui penyebab terjadinya korosi. Penelitiandilakukan dengan menggunakan teknik pengamatan metalografi langsung dilapangan denganmenggunakan mikroskop metalurgi portable. Hasil pengujian menunjukkan korosi terjadi akibatkorosi galvanik yaitu sambungan dua jenis logam nirkarat yang berbeda dan diperparah denganterjadinya korosi pitting. Pengujian dengan menggunakan sinar X fluorisensi juga membuktikanbahwa pelat bagian bawah tanki dan pelat bagian samping dan atas ternyata memiliki kandunganyang berbeda. Untuk mengatasi hal ini maka teknik pengelasan harus ditingkatkan denganmenggunakan logam pengisi yang tepatKata kunci: tanki, air panas, korosi, baja nirkarat, galvanik, pittingAbstract : Hot water storage tank that was made from stainless still was investigated in this case. The tankwas found failure in service due to corrosion in welded section. Corrosion also was found at thebottom part of the storage tank. The tank was used for no longer than one year but unfortunatelysevere corrosion was found. The purpose of this research is to find the reason why the tank easilycorroded especially at the bottom part and at the welding section. The research was carried out byconducting metallographic examination directly in situ by utilizing portable metallographicmicroscope. It is found from investigation that the corrosion was happen due to galvanic corrosion.Investigation by using X ray fluorescence also agree that the composition of the bottom part of thetank was different with the wall, and upper section. The welding filler also was found not correctlyprepared that make pitting corrosion to occur. It is suggested to conduct advance research toinvestigate the correct composition for the filler during welding.Key word: Tank, hot water, corrosion, stainless steel, galvanik,pitting
Perancangan Sistem Pengendalian Suhu pada Gedung Bertingkat dengan Teknologi Wireless Sensor Network Bambang Sugiarto
Jurnal Energi Dan Manufaktur Vol 4, No.1 April 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

At the building, for example the office building, hotels or the apartment, is needed by a controlsystem of the temperature. This is caused the number of rooms so it is difficult to monitor the use ofAir Conditioning (AC) for each room. This control system is used to monitor the temperature ofeach room so as to be able to control the use of AC. This paper will discuss the designing of controltemperature by using technology of Wireless Sensor Network (WSN). WSN technology made use ofthe Zigbee wireless network as the data communication, where each room was installed by atemperature sensor (the node sensor). The node sensor that is installed in each room are connectedwith each other and make the star, the tree or mesh network formation. The advantages of thissystem is using Zigbee wireless that is free of the licence. The results of the temperaturemonitoring of each node sensor are afterwards gathered in the Base Stasion Controller (BSC) thatbecame the centre of managing and processing the data, so as to be formed a control system of thetemperature of each room to this building.
Analisis Airfoil Double-Slot Flap LS(01)-0417 MOD Dengan Airfoil Tanpa Flap Nasa SC(2) 0610 Gaguk Jatisukamto; Mirna Sari
Jurnal Energi Dan Manufaktur Vol 11 No 2 (2018): Published in Oktober 2018
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (663.8 KB) | DOI: 10.24843/JEM.2018.v11.i02.p03

Abstract

Kestabilan pesawat terbang ditentukan oleh desain airfoil sayap dan ekor. Perbedaan kecepatan aliran udara antara permukaan atas dan bawah airfoil menghasilkan perbedaan tekanan sehingga akan memberikan gaya angkat (lift) pada sayap. Perbedaan tekanan udara pada permukaan sayap dinyatakan dengan pressure coefficient (Cp), yaitu perbedaan tekanan statik lokal dengan tekanan statik aliran bebas. Koefisien lift (Cl) adalah rasio antara gaya angkat (lift) dengan tekanan dinamis. Peningkatan angka CL sebesar 20,4% pada riset sebelumnya diperoleh berdasarkan simulasi penambahan flap. Tujuan penelitian ini adalah membandingkan hasil simulasi airfoil double slot flap LS(01)-0417 MOD dengan airfoil NASA SC(2) 0610 yang tanpa flap dan mencari korelasi antara sudut serang (?) dengan koefisien lift (Cl ).Metodologi penelitian dilakukan dengan simulasi Computational Fluid Dynamic (CFD). Hasil penelitian dapat disimpulkan bahwa koefisien lift CL untuk airfoil double slot flap LS(01)-0417 MOD menghasilkan CL = 1,498 sedangkan dengan sudut serang ? = 16o sedangkan airfoil NASA SC(2) 0610 tanpa flap memiliki nilai CL = 1,095 dengan sudut serang 13o. The stability of the aircraft is ordered by the airfoil design of the wings and the tail. The difference in flow velocity between the surface and the bottom of the airfoil will produce styles that will present lift on the wings. The difference in airflow velocity between the top and bottom surfaces of the airfoil produces a pressure difference so it will provide lift (lift) on the wing. The lift coefficient (CL) is the ratio between lift with dynamic pressure. The difference of air pressure on the wing surface is expressed by pressure coefficient (Cp), the difference of local static pressure with free flow static pressure. The lift coefficient (Cl) is the ratio of lift to dynamic pressure. An increase in CL value of 20.4% in previous research was obtained based on the simulation of flap addition. The purpose of this research is comparison between airfoil double slot flap LS (01)-0417 MOD with airfoil NASA SC (2) 0610 without flap and search between angle of attack (?) with coefficient of lift (Cl). Method research is done by Computational Fluid Dynamic (CFD). The result of this research can be concluded that lift coefficient CL for double slot airfoil flap LS (01)-0417 MOD yield CL = 1,498 while with angle of attack ? = 16o while airfoil NASA SC (2) 0610 without flap have value CL = 1,095 with angle of attack 13o

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