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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 16 Documents
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Search results for , issue "Vol 4, No.2 Oktober 2010" : 16 Documents clear
Studi Sifat Impak Ketahanan Aus dan Koefisien Gesek Bahan Komposit Arang Limbah Serbuk Gergaji Kayu Glugu Dengan Matrik Epoxy I Gusti Ketut Puja
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (188.31 KB)

Abstract

Waste of sawdust materials of coconut wood is potential to be used as engineering materials of technology products, such asbrake pad for light vehicle. Some important properties of materials to be used as a brake pad is wear resistance, impactstrength and the friction coefficient. This study aims to investigate the coefficient of friction, wear and impact properties ofcomposite materials of coconut wood charcoal sawdust with epoxy matrix. Coconut wood charcoal sawdust produced attemperatures varies from 200, 300, 400 and 500 degrees Celsius for 2 hours respectively. The charcoal was tested for carboncontent. The charcoal with high carbon content then is used as filler composites. Composite is manufactured by hydraulic presscast method with content of filler (particle) varies from 28, 37, 46 and 55 percent (v/v). Testing was conducted on the coefficientof friction, wear, and Charpy impact. The results are verified with the properties of the commercial brake pad. Charcoal isproduced at a temperature of 200 and 300 degrees Celsius has the highest carbon content (91.98% and 89.64%). Compositefriction coefficient increases with increasing particle content. The largest friction coefficient (0.445) occurred in the compositewith particles content about 55 percent (v/v). Composite friction coefficient increases with increasing content of particleswhere the value is greater than the commercial brake pad (0.34). Composite with particle content of 46 percent has the lowestspecific wear rate, about 4.13 mm2/kg (the best wear resistance). This value still higher than the commercial brake pad (2.04mm2/kg). Composite with particles content of 37 percent has the fracture energy about 0.27 joules, and the thoughness about2.87 kJ/mm2. Composite with particle content of 37 percent was likely can as a brake pad, but the wear resistance still lowerthan the commercial products
Performansi Pengering Ikan Aliran Alami memanfaatkan Energi Kombinasi Kolektor Surya dan Tungku Biomassa Made Ricki Murti
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (675.554 KB)

Abstract

In a drying process usually used forced flow condition. The energy used a dryer is usually only a single type of energy. Thus,the study is conducted on the natural flow dryer system by using the chimney. The energy used as a dryer is solar energy andbiomass that can be used simultaneously or one turns in accordance with the needs and circumstances. Has done testing of aprototype natural flow dryers utilize a combination of solar collectors energy and biomass furnace. Testing is done threetimes a process by measuring the following: the inlet air temperature of the biomass furnace, the outlet air temperature of thebiomass furnace, the inlet air temperature of the solar collector, the outlet air temperature of the solar collector, airtemperature into the drying chamber, air temperature out of the drying chamber, the mass decreasing of dried material, andthe intensity of solar radiation. Data were collected at each interval of 30 minutes was followed by processing of these datato obtain system performance, then made in the form of performance versus time graph. Results obtained in the form ofdrying time is achieved for one-time drying process is 7,5 hours, the average Solar collector efficiency is 54.4%, the averagebiomass furnace efficiency is12.57 %, the average drying efficiency is 22%, and the average system total efficiency is 2,8%.
Efek Dendrite Arm Spacing terhadap Sifat Mekanis Paduan Perunggu Cu-20%Sn I Ketut Gede Sugita; R. Soekrisno; I Made Miasa; Suyitno -
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

The purpose of this work is to investigate the effect of dendrite arm spacing on mechanical properties bronze20%Sn alloys The commercial pure copper and tin were melted in crucible furnace at temperature 1000oC. The molten metalwas casted in permanent moulds which have variation temperature, i.e. 35oC, 200oC, 400oC. The history of coolingtemperature on castings was recorded using a computer aided data acquisition Lab view 8.2 system.The microstructure and mechanical properties of this alloy have been investigated. The results of this researchindicate that decreasing the mould temperature affected on increasing solidification rate that caused to reduce thesolidification time. On the other hand, the difference of solidification rate have effected on microstructure forms. Thedendrite arm spacing (DAS) decreases with increasing solidification rate. DAS affected on mechanical properties i.e.ultimate tensile strength and hardness as cast. The mechanical properties increase with decreasing DAS.
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.557 KB)

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.
Pengaruh Penempatan Penghalang Berbentuk Silinder Pada Posisi Vertikal Dengan Variasi Jarak Horisontal Di Depan Silinder Utama Terhadap Koefisien Drag Si Putu Gede Gunawan Tista
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (874.062 KB)

Abstract

One of the ways to reduce energy consumption on the air plane and the other bluff bodies are by decreasing the drag. Dragis closely related to the flow separation. The earlier separation, then the drag will increase more. Based of the fact the effortto decrease drag is conducted by manipulating the field of fluid flow. Stream manipulation was be done by installingcylindrical obstacle in front of main cylinder. The purpose of this research is to analyze the effect of placement cylindricalobstacle at vertical position in the various horizontal distance in front of main cylinder on drag coefficient . In thisresearch, the experiment was conducted in the wind tunnel, which consisted of blower, pitot pipe, manometer, cylinder pipe,and cylinder rod. The cylindrical obstacle was positioned at vertical (y=14 mm) in the various horizontal distanceL/D = 1.41, L/D = 1.56, L/D = 1.72, L/D = 1.88, L/D = 2.03, L/D = 2.19, and L/D = 2.81 by upstream from the maincylinder. Diameter cylinder obstacle was 8 mm.. The Reynolds number based on the main cylinder diameter (D = 42 mm)was Re = 3.42 x 104. The research results showed that the cylinder rod could decrease the drag coefficient of main cylinder.Drag coefficient for cylinder without cylinder rod was 0.167 while the biggest decrease of coefficient of drag with cylindricalobstacle was happened at L/D = 1.72 which was 0,0593. It means that the drag coefficient of main cylinder with cylindricalobstacle was 64.5% lower than the cylinder alone.
Interaksi antara Proyektil dan Komposit Polimer diperkuat Butiran Silikon Karbid (SiCp) dan Serat Karbon pada Pengujian Balistik Daud Simon Anakottapary; Tjokorda Gde Tirta Nindhia
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (662.429 KB)

Abstract

With increasing the security treat and terrorisms that involving the use of firearm and to optimize the security thenmaximum protection for he safety of the security guards, armies, and polices should be put in consideration. In order toconduct their duties properly and to protect their safety, the security guard should be completed with bulletproof body armor.Since the price of commercial bulletproof body armors is very expensive that only special force is possible to have it. It is thepurpose of this research to develop material for bulletproof body armor with reasonable price but having good performancethat can be used by security guard. In this research the SiCp was pressed in order to have a diameter surface in the 11.5cmand high 1 cm mould. Afterward the mixture of polyester and carbon fiber was poured in to the mold until reach 1 cmthickness. The natural cooling was done naturally for about 24 hours with addition of catalyst to solidify the composite. Theballistic test performance will be conducted with cooperation with the institution that has authority for this activity, and theresult will be analyzed and reported.

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