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Jurnal Penelitian Saintek

saintek
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Published by Universitas Negeri Yogyakarta

ISSN : 14123991 EISSN : 25287036 DOI : 10.21831

Core Subject : Science,

Decision Sciences, Operations Research & Management

Arjuna Subject : -

Articles 4 Documents

Search results for , issue "Vol 11, No 1: April 2006" : 4 Documents clear

MODIFICATION OF TRIGGER SYSTEMS ON THIRD POWER ELECTRICAL CONTROL OF MEDANG VEDC PHASE Haryanto Haryanto; Sunomo Sunomo
Jurnal Penelitian Saintek Vol 11, No 1: April 2006
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

AbstractThe fault of the pulse transformer and the TCA 785 triggering systems in themodule of Power Electronics made by VEDC Malang make it difficult tosubstitute due to the high prices and unavailability in Yogyakarta market.The purpose qf this application research is to substitute of TCA 785 with twooutputs by two pieces of NE 555 which work in the same manner, and tosubstitute ofpulse transformer for SCR and TRIAC phase control (firing) withoptocoupler MDC 302/ in module 501 for laboratorium practicum: Themodification is needed because of unavailability of the two components and theprice. For three phase control, the system need three pieces of both TCA 785 '.I'and pulse transformers. So, the substitution needs six pieces of both NE 555 '.I'and MOC302I '.1'. Using of optocouplerfor coupling offiring the SCR '/TRlAC '.I'is to avoid induction voltage from the main to the controlling part system whenthere is afault or short circuit in the main system.This experiment applied to the SCR firing of 0"-180" phase control and to theTRIAC of U' -180" and 180" -360" phase control. in this action. the performanceofthe NE555's and the MDC 3021 '.I' must be the same of the TCA 785 and thepulse transformer.The result shows that without the compensation circuit of main networksynchronization, NE 555 's have good performance for SCR half wave phasecontrol. For TRIAC phase control, the control of positive and negative cycledone in serial manner, not in the same period, the first action is/rom (/' to 180",and then followed from 180" to 360". With the compensation circuit of mainnetwork synchronization, the behavior offiring 111 phase control has the same manner with TCA 785 but notforfiring of 0"-45" The cause is comingfrom the fact that the firing signalfrom the of NE 555 is done by the rear of the output pulses. and the histeresis of serial synchronization system for NE 555 triggering To improve the performance, new design of main network synchronization is needed, that work in the leading scheme of zero crossing.

STATEMENT OF MECHANICAL PROPERTIES OF MATERIALS WHICH HAVE ANALYZED Edi Istiyono
Jurnal Penelitian Saintek Vol 11, No 1: April 2006
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The experiment purposes to observe 0(' (1) the influence of temperatureto the [ensile strength of material. (2) the influence of anneal lime to the tensile strength of material. (3) the influence (if temperature to the torsion modulus (if material, (4) the irfluence (if anneal lime to the torsion modulus of material. and (5j discover the material that has optimum of tensile strength and torsion modulus.Sample of the experiment is win! of ion. steel and copper which areannealed 011 temperature of 15()°C, 25{)°C, 350°C, 45()"C, 550"C,650"C. 750°C. 850°C, and 950°Cfor 30 minutes. Besides. the wires are annealed on temperature 350°Cfor 30.60, 9().120. 150. IBO. ]J() and240 minutes. The tensile strength of materials is measured with atensometer. Tension modulus of materials is measured with tension modulus meter.Based on data analysis is concluded thai. ( l ) Increasing of thetemperature anneal causes decreasing of ttle tensile strength of the materials. (2) increasing of the time anneal causes decreasing of the tensile strength (if the materials. (3) increasing (if the temperature anneal causes decreasing of the torsion modulus of the materials. (-/) increasing of the anneal time causes decreasing of the torsion modulus of the materials. and (5) the optimum tensile strength is the steel which anneal temperature of 450°C and anneal time (if 30 minutes. The optimum torsion modulus is iron, which is not annealed.

ANALYSIS OF DISTRIBUTION SIMULATION OF SUSPENDED SLAB AND CYLINDER SUPERKONDUCTOR USING ELEMEN METHOD Supardi Supardi
Jurnal Penelitian Saintek Vol 11, No 1: April 2006
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Investigation of creation of ordered parameter distribution on superconductor material, especially cylinder form has been conducted. Distribution of ordered parameter inside the material is obtained by applying external magnetic field parallel to the surface of the material. When the external magnetic field is reduced carefully, ordered parameter distribution will create at a certain value called He).The method applied to obtain the ordered parameter distribution isfinite element method. To make easy in computation work, be applied FEMLAB software. The software works under MATLAB running. Principles of finite element method have been covered in FEMLABThe result of the numerical simulation show in line between the beginning hypothesis of researcher and computation result. Compared with previous result, the result does not deviate significantly.

PERFORMANCE OF BACKPROPAGATION NEURAL NETWORKS FOR CULTIVATION DAILY LOADS IN JAW A CENTRAL-DIY Kustono Kustono; Yuwono Indro Hatmojo
Jurnal Penelitian Saintek Vol 11, No 1: April 2006
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Goals of this research are implementing Artificial Neural Network (ANN) algorithm for load forecasting and getting its performance. The training data was takenfrom UPB Ungaran. The performance can be got through comparing ANN test result with the real load at that time. The research methodology usc experimental and design models approach. The phases of this research were: I. analyzing and identifying of need 2. developing of load forecasting application software with C programming. 3. entering and training the data to get data pattern.The result of this research. the load forecasting result by ANN was close with UPB loadforecasting. but several ANN test result have more deviation than UPB. because number of training data was less. so the forecasting pattern 111as not too accurate Beside that. another possibility was the number of iteration must be more than / ()()(J timesiterations in order to get more less error. There was 33,3% of ANN result that has more less deviation, although the number of training data was not different, because that data has no extrem variation, sothe pattern was faster to be recognized. Generally, ANN will give an accurate pattern recognation if the data is valid and the number of the data is quite enough.

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