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MESIN
Published by Universitas Trisakti
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue " Vol 8, No 1 (2006)" : 6 Documents clear
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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Abstract

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.
IDENTIFIKASI PARAMETER FISIK MASSA, KEKAKUAN DAN REDAMAN DENGAN MENGGUNAKAN METODE ESTIMASI Hutahaean, Ramses
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

Due to progressively expand ofthe complication machine structure, hence the accurate mathematicsmodels will become important in order machine structure design. But sometimes we found that themathematics modeling cannot forecast the dynamics behavior in comparison with real dynamicscharacteristic ofthe structure. Thatis becauseofinaccurate whendetermining the parameter whenmodellingprocess. In order to get the real dynamics characteristic, we need a teqnique to identify the dynamicscharacteristic of the structure by measuringfrequency respon function, while the constraint often is verydifficult to get the damping matrix from data containing noise. At this handing out method, writer willestimate mass, stiffness and damping matrix which developed by Chen, Ju And Tsuei (1996) to determinedynamics characteristic ofrotating rotor.
ANALISA METALURGI DAN SUPERVISIPERBAIKAN POROS FORCED DRAFTFAN SEBVAK UNIT PLTU Adnyana, D. N.
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

Aforceddraftfan (FDF) shaft of a steam generatingpower plantfailed after several years inservice.Thefailed shaft showed a deep surface scratch on its one end and this was likely caused and advanced by thebearingfailure. The scratched endshaft was decided to repair by in-situ welding and machining. Anumber ofin-situ metallurgical examinations were performed to determine type ofmaterial and degree ofdamage thathave occurred on the shaft including: dye-penetrant test, chemical composition analysis, metallography byreplica technique and hardness test. From the test results obtained itwasfound that the FDFshaft was madeof material with specification ofJIS S45C or equivalent toAISI1045 - 1050. The test results obtained wereused to determine the machining depth being made onthe scratched shaft before performing welding repairand the welding process parameters required such as type of welding electrode and diameter, weldingcurrent, pre-heat temperature and post-weld heat treatment. The result of weld repair obtained showed thatthe hardness value of the repaired shaft was approximately close to the hardness value of the normal shaftmaterial, namelyrangedfrom 170 to 173 HB.
EFEK KOMPOSISI BIODIESEL TERHADAP PARAMETER KUALITAS BAHAN BAKAR DAN UNJUK KERJA MESIN (PERBANDINGAN BIODIESEL SAWIT DENGAN BIODIESEL JARAK CASTOR) Fajar, Rizqon; Suryantoro, Taufik; Sugiarto, Bambang; Setiawan, Frans
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

Biodiesel is the mono alkyl esters oflong chain fatty acids derivedfrom renewable lipid sources.Biodiesel as asubstitute ofpetroleum dieselfuel has some advantages: itproduces cleaner exhaust gas, betterin lubrication, and doesnt need engine modification. This paper presents the results ofresearch concerningthe effect ofdifferentfatty acid composition ofbiodiesel onfuel quality and its performance in diesel engine.For this purpose three different fuel sample were tested, Indonesian diesel fuel (solar) as a reference,blending solar 70%- oil palm methyl ester 30%(B-3 sawit) and blending ofsolar 70%- castor methylester 30 %(B-30 castor) . All ofthese fuels are tested using Hydra diesel engine, single cylinder indirectinjection (IDI). The test results shows that the performance (peak pressure in the cylinder) ofthreefuels arequite similar, however the two biodiesel blends show lower emission in smoke, hydrocarbon, and CO atdifferent injection timings and different loads. For NOx emission, it is slightly higher. B-30 castor containsmore unsaturatedfatty acids than B-30 sawit and therefore produced higher emission bfNOx. Beside, castormethyl ester contains an extra hydroxyl group in ricinoleic acid that probably leads to lower smoke andhydrocarbon compared to B-30 sawit. It is still aquestion that CO emission ofB-30 castor higher than ofB-30sawit. Research in the effect of chemistry andfatty acid composistionof biodiesel on the emission areneeded to be able describe mechanism ofCO, hydrocarbon andNOxformationfrom biodiesel.
INTERAKSI Ag DENGAN SUPERKONDUKTOR BSCCO FASA 2223 Purwamargapratala, Yustinus; Adi, Wisnu Ari
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

Interaction Ag with 2223phaseBSCCO superconductor. The addition o/Ag20 (0, 2.5, 5, and10 wt%Ag) to matrix of2223 phase BSCCO superconductor that sintered at 845 oCfor 72 hours in air have beeninvestigated. The Agadditions promote thedecomposition of2223phasesto 2212phasesBSCCO andcausedpresent some impurities phases. The impurities areproducted bythe Agaddition ableto be usedas effectivelypinning sources to hold vortex (flux line) movement. The Tcmeasurement results are 111 K, 107 K, 105 K,and103Kwith addition ofO, 2.5, 5, and10 wt%Ag respectively. The Jc measurement results are 3.6xl(f,5.6x1(f, 6.9x1(f, and U.8xl(fAm2 with addition ofO, 2.5, 5, and 10 wt%Ag respectively. From theXRDanalysis shown that the addititon ofAg caused peaks of 2212phases BSCCO are clearly visible and thesamples contain some impurities phases (CuO, Ca^CuO^, dan CajPbOJ. From the SEM analysis shown thatthe addititon ofAg should lead to a slight increase of the plate like grain size of 2223phase BSCCO withincreasing Ag content. From this experiment we conclude that the Tc depress and the Jc enhance withincreasing Agcontent. The addititon ofAg should leadtoa slight increase ofthe platelike grain size of 2223phase BSCCO with increasingAg content.
STUDI APLIKASI KERAMIK ZnBiCo SEBAGAI TERMISTOR NTC Syarif, Dani Gustaman; Henny, Henny; Suhandi, Andi
MESIN Vol 8, No 1 (2006)
Publisher : Program Studi Teknik Mesin, Universitas Trisakti

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Abstract

STUDY ON THE APPLICA TION OF ZnBiCo CERAMICS AS NTC THERMISTORS. A study onthe application ofZnO-Bi203-CoO (ZnBiCo) ceramicsfor NTC thermistors had been carried out. The aim ofthisstudywas tofind alternative NTCthermistors. The studywas done as follow. Powder ofZnO, CoO andBi203 with concentration of Bi203 of 0, 0.25, 0.5, and 0.75 mole % and of CoO of 2 mole % werehomogeneously mixed. The mixedpowder was pressed with pressure of3.9ton/cm2 into pellets and sinteredat HOCfC in airfor 1 hour. The sintered pellets were evaluated using x-ray diffraction (XRD), opticalmicroscope andSEM(Scanningelectron microscope). Resistivity-temperature characteristic (p-Tcurve) wasdetermined through measurement of resistivity at various temperatures from room temperature to WCfC.XRD andmicrostructure datashowed thatmostofCoOformed a solid solution withZnOmatrix while Bi203was segregated at grain boundaries as ZnO,24Bi203 second phase. It was known that the all ceramicsproducedin this studyhad the same structure i.e. hexagonal. It was known also that the addition ofBi203increased the average grain size of the ZnBiCo ceramics. Electrical data showed that Bi203 increased theroom temperature resistivity (ps^) and the thermistor constant (B) of the ZnBiCo ceramic thermistors. Thethermistor constant and sensitivity (a) of the thermistor ceramics in this study were relatively high (largerthan 200(fKfor Band larger than 2.2 (°K)~lfor a)andsuitableforcommercial application.

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