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INDONESIA
MESIN
Published by Universitas Trisakti
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Mechanical Engineering
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Articles 52 Documents
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Simulasi Numerik dan Validasi Experimental Distribusi Aliiran Udara di Dalam Cooling Tower Prasetyo, Bambang Teguh
MESIN Vol 9, No 3 (2007): Ocean Thermal Energy Conversion (OTEC) untuk "Pulau-pulau Kecil"
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Numerical Simulation and Experimental Validation ofAir Flow Distribution in CoolingTower. Numerical simulation and experimental validation of air flow distribution in induced draftCooling Tower (CT) has been done. Numerical simulation was done by using Computational FluidDynamics (CFD) software, while measurement was conducted by using a testfacility exist in BTMPBPPTThis studyis aimedto assist thepreliminary analysis predicting thatone ofcause a higherofmakeup waterconsumption in CTis mal-distribution ofair stream in CT. The results ofnumerical simulationand testing shows that tendency of mal-distribution of air stream is true happened. But to ensure thatwhether this mal-distribution ofairflow mentioned as the root cause ofheight consumemake waterstillrequireto be proved after theCTprovided withhomogeniser ofair stream.
KARAKTERISTIK UNJUK KERJA MOTOR DIESEL INJEKSI LANGSUNG BERBAHAN BAKAR GANDA CNG-SOLAR Prawoto, Prawoto; Sumartono, H.; Shalahuddin, L.
MESIN Vol 8, No 2 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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This paper describes a study that compared heat release, performance and exhaust emission from asingle cylinder direct injection engine fueled with dual-fuel (Compressed Natural Gas, CNG), with thoseIndonesian dieselfuel (solar). The dualfuel tested was mixture of about 80% CNG-20% Solar. The study isbased on the engine test bed results from Centerfor Thermodynamics, Engines and Propulsion-BPPT. Thetest results have shown that for a given engine speed, the diffusive combustion phase period on the enginefueled with dualfuel were shorter than dieselfuel, whereas the late combustion phase were longer. However,premixed orrapid combustion phase periodfor dualfuel were shorter at low speedandlonger at high speedthan thosefoundfor dieselfuel. Enginefueled with dualfuel pratically produced the same maximum torqueandpower asenginefueled with dieselfuel 100%, andean be operated on large range ofspeed. The emissiontest results have shown a lower particulate matter, slightly higher hydrocarbon (HC) andcarbon monoxide(CO) than the same enginefueled. Oxide ofNitrogen (NOx) emissionfrom dual-fueled however was generallyhigher. The data obtained in this study indicate that dualfuel has promise asan emission reducing alternativefuelfor dieselengine, mainly onparticulate emission.
Analysis of Ni25at%Cr Debye-Waller Factor Jahja, Aziz K.; Effendi, Nurdin
MESIN Vol 9, No 3 (2007): Ocean Thermal Energy Conversion (OTEC) untuk "Pulau-pulau Kecil"
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

Analysis of Ni25at%Cr Debye-Waller Factor. Intensity analysis on X-ray diffractionexperiment was carriedout on Ni25at%Cr solid bulk sample to study the effect ofheat treatment on thephysical properties. Rietveld analysis (RIETAN) on both the untreated and heat-treated samplesincorporates both structural parameters such as Debye-Waller temperature factor and non-structuralparameters such as peak-position, peak-width, and peak broadening. Changes in these parameters havebeen observed in these samples, normally associated with changes in the materials properties after heattreatment,although previous residts show that the samplesmicrostructure and crystal group symmetryhave not been altered. Careful analysis revealed that on the atomic scale, the materials physicalcharacteristics such as Debye temperature, molar heat capacity, and homogenous and inhomogeneousstrain, thermal coefficient expansion have experienced some changes. Therefore this finding should havephysical impact onthe materials, such as convection-heat rate and thermal conductivity.
Pengembangan Perangkat Lunak Untuk Pengukuran 2D Berbasis Citra Triyono, Triyono; Aditya, Aditya
MESIN Vol 9, No 2 (2007): MEMINIMALKAN KERUGIAN KAMPUS AKIBAT BANJIR
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Software Development for 2D Measurement Based on an Image. Theprincipal ofdigitalimage measurement program is transferring a taken image object to computer to be process to digitaldata andfrom digital data to numeric value. Digital camera and USB can be used as transferring dataequipment, and to retain the objectflatness, a measurement table is used as the based. The imageobjectthat shownin the computer monitor will be use as a guidefor the dimensional measurement by choosingthesurface target area. The dimension attain is theresult ofthe Cartesian coordinate system reading ofthe measured imageobject. The superiority ofthissoftware is the object can beplaced anywhere aroundthe measurement table. The software is made with Visual Basic language and can be usedfor objecttharare: easy to deflect, electrostatic free, small and thin.
PERBANDINGAN KARAKTERISTIK SKD 11 MOD TERHADAP SKD 11 Ariobimo, Rianti Dewi Sulamet
MESIN Vol 9, No 1 (2007): Bahan Bakar Alternatif
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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As mentioned in the previous paper, SKD-11 Mod. is made to upgrade SKD-11properties especially in heat treatment process by modify its chemical composition. This research isconducted to see the improvement that SKD-11 Mod. gain compare to its origin metal, which isSKD-11.
UJI STATISTIK PADA PENELITlAN PENGARUH PERLAKUAN PERMUKAAN TERHADAP UMUR FATIK DENGAN DATA TERBATAS Suhartono, H. Agus
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Justifications on the influences of two or more parameters on fatigue strength are some timesproblematic due to the nature scatter of the fatigue data. Statistic test canfacilitate the evaluation, wether thechanges in material characteristics as a result ofspecific parameters of interest is significant. Thestatistictests were applied tofatigue data ofAISI 1045 steel specimens. Thespecimens are consisted ofas receivedspecimen, shotpeenedspecimen with 0,0147 and0,0161 Almen intensity as well as carburizedspecimen. Thefatigue tests of the specimens are conducted in three horizonts of loading. The fatigue datas are thendescribed by S-N diagrams (Stress - Cycles to Failure diagrams). A transformation to one stress horizon iscarriedout dueto limitedamount ofthefatigue data. Statistic tests, which are appliedto the datasshow, thattheshotpeeningandcarburization processprovide a significant effect to thefatigue strength ofthespecimen.However additional timein shotpeeningprocess with thepurposeofincreasing theshotpeening intensity hasnosignificant effectto the increasingoffatigue strength ofthesteel specimens.
AUnifying Perspective to Understanding Computational Intelligence Techniques and Their Applicability in Various Application Romyaldy, Romyaldy
MESIN Vol 9, No 3 (2007): Ocean Thermal Energy Conversion (OTEC) untuk "Pulau-pulau Kecil"
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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A Unifying Perspective to Understanding Computational Intelligence Techniques andTheir Applicability in Various Applications. Computational intelligence techniques, such as NeuralNetworks, Support Vector Machine (SVM) and Fuzzy Inference System (FIS), has been receiving a largeattention in research area nowadays. Their application has covered vast area from engineering andbusiness. This paper highlight a perspective that could provide newcomer to this field (especially) reasonsand explanations for theirsuch wide range of applications. Throughout thepaper, control applications inwill be used as an example for the implementation of this perspective in real mechanical engineeringapplication.
PENGARUH PENDINGINAN UDARA DALAM PROSES PENCETAKAN TERHADAP MIKROSTRUKTUR BAJA COR STAINLESS TAHAN PANAS SS 309 Pujadi, Pujadi; Irawan, Dimas
MESIN Vol 8, No 2 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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This research is designed to studythe microstructure properties of309 (HHtype) cast stainless steel.The materialwas manufacturedon an air cooling castingprocess. SS309 ACnotation is given to the materialto differ itfrom the same material made by mould cooling casting process (SS309 MC). The compositioncontrolduringcastingprocess has proven to ensurebothmaterials having austenitic structure. TheSS309 ACand SS309 MC austenite microstructure is stabilized with chromium carbide precipitate Cr7C3 aroundaustenite grain boundary and intergranullarly. However the optical microscope test showed the carbideprecipitate in SS309 AC is distributedmore homogenthan in SS309 MC. Thisstructure isfavorable for heatresistantcast stainless steel because it acts as austenite stabilizer in high temperature application. Thetensiletest shows that the SS 309 AC tensile strength (568.89 MPa) is qualified with the HH grade standard(550 MPa). This value is also better compared withSS309 MCtensile strength (543.9 MPa). TheSS309 MChas bigger carbideprecipitate grain size whichreduces its ductility.
Simulasi Efek Ukuran dan Lokasi Kebocoran Pipa Pendingin Reaktor Nuklir Menggunakan Fasilitas Eksperimen UUTR.Mod-l Antariksawan, Anhar R.; Juarsa, Mulya; Prasetyo, Joko; Sumarno, Edy; Kiswanta, Kiswanta; Handoyo, Ismu
MESIN Vol 9, No 2 (2007): MEMINIMALKAN KERUGIAN KAMPUS AKIBAT BANJIR
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Experimental Simulation of The Effect of Size and Location of Coolant Pipe Break inNuclear Reactor Using UUTR.Mod-l. Several experiments of LOCA with various break size andlocations have been conducted using UUTR.Mod-l testfacility. The break sizes studied are 2 mm, 5 mmand 10 mm, each at hot-leg and cold-leg side. The initial conditions ofthe experiment are 1 MWofpower,primary side pressure of 155 bar approximately, coolant flow rate of 9.8 kg/s and only accumulator isfunctioned as emergency coolant. Both at hot-leg and cold-leg, the break size of 2 mm showed slowerpressure decrease rate and the occurrence of temperature increase early after break. For larger breaksize, pressure decrease is faster and showed rod temperature excursion due to rod uncovering.Concerning the breaklocation, in large break area, cold-leg breakshowed heater temperature excursionearly than in case of hot-leg break. Size and location of break determine the timing of event and, asconsequence, different behavior of response system. In any cases to prevent the fuel temperatureexcursion, the addition ofautomatic depressurizationsystem and installation ofinjection system in upperhead ofpressure vessel have been consideredin the nuclearreactor design.
PENENTUAN KUALITAS PELUMASAN MESIN Fajar, Rizqon; Yubaidah, Siti
MESIN Vol 9, No 1 (2007): Bahan Bakar Alternatif
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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The monitoring on commercial engine lubricants have resulted that the properties ofmost lubricants (synthetic, semi synthetic and mineral type) have met the requirements specifiedforcommon engine oil. However, significant variations have been found in the properties such asviscosity, viscosity index and additive contents (anti oxidant &detergent). Too high in viscosity willgive difficulty during engine staring and increases the fuel consumption. Meanwhile if the viscosity istoo low this will create more risks for engine damage (metal to metal contact). Some of the samplesfrom synthetic, semi synthetic and mineral lubricants have shown that the additives contents (antioxidant, antiwear anddetergent) are too low. Lower additive contents means that the service life ofthelubricants will be shorter than the usual recommendation. Most of mineral lubricants are too highviscosity at normal temperature of engine operation (lOffC). This will decrease the efficiencyfor theengine operations (highfuel consumption).

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