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INDONESIA
TEKNIK
Published by Universitas Diponegoro
ISSN : 08521697     EISSN : 24609919     DOI : -
Core Subject : Engineering,
Engineering
Journal yang mempublikasikan artikel-artikel ilmiah dari berbagai disiplin ilmu rekayasa/keteknikan. Artikel-artikel yang dipublikasikan di Jurnal TEKNIK meliputi hasil-hasil penelitian ilmiah asli (prioritas utama), artikel ulasan ilmiah yang bersifat baru (tidak prioritas), atau komentar atau kritik terhadap tulisan ilmiah yang dipublikasikan oleh Jurnal TEKNIK.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Volume 28, Nomor 2, Tahun 2007" : 15 Documents clear
APLIKASI FIS MODEL SUGENO PADA PENGENDALIAN VALVE UNTUK MANGATUR TINGGI LEVEL AIR Wahyudi, Wahyudi; Setiawan, Iwan; Nainggolan, Martina
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (606.828 KB) | DOI: 10.14710/teknik.v28i2.2144

Abstract

Fuzzy control is one of the controller alternative using expert system ( human being logic) as controller sothat do not need knowledge concerning parameter of systems. Fuzzy control also have ability of lightcomputing. This paper goal is making a Fuzzy control and observe the response of the plant had beencontrolled. The experiment’s purpose is to show the performance of Fuzzy control in control valve systemin order to liquid level controlling on-linely. Water level controlled by opening the load valve in the holdtank. The project experiment’s include examination conduct logic of Fuzzy program of Codevision AVR,examination of system at some references, examination the changing of liquid level reference, andexamination of system with the influence of disturbance. From the test, it is known that Fuzzy control withAVR ATmega8535 can yield eliminate offset in arranging opening of valve. Offset in examination ofsystem at some references are 0,4 cm , 0,02 cm , 0,17 cm, 0,11 cm, and 0,54 cm. Offset in examination thechanging of liquid levels are 0,07 cm, 0,02 cm, and 0,04 cm.
ANALISIS RESIKO KONSENTRASI DEBU (TSP) DAN TIMBAL (Pb) DI PINGGIR JALAN TERHADAP KESEHATAN MANUSIA STUDI KASUS KOTA YOGYAKARTA Setyo Huboyo, Haryono; Syafrudin, Syafrudin
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (659.681 KB) | DOI: 10.14710/teknik.v28i2.2115

Abstract

Motor vehicle emission generate numerous harmful pollutants in the street every day, some of them arecarcinogenic such as TSP and lead. Yogyakarta is one of represent city which has high traffic load so that thecontamination effect is pronounced. This research was aimed at analysing the risk from related pollutant forpeople who live or work in the vicinity of main streets. This work consists of four steps i.e hazardidentifications, exposure assessment, toxicity assessment, and risk characterization. High volume samplerwas used to catch ambient TSP, spektrophotometer was used for Pb analysis further. Fifteen main streets hadbeen selected for field sampling. Hazard identifications to TSP and Pb concentration was mirrored toambient air standard that maximal concentration for the TSP is 230 μg/m3 and for Pb is 2 μg/m3. Onexposure assessment the TSP concentration in Wates street, Janti, Godean street, Solo street, PKUMuhammadiyah, and STTL exceed ambient air standard (Kep. Gub. DIY No. 513/ 2002), whereas for Pb, allstreets comply to standard. Toxicity assessment revealed that TSP intake in all place was safe since thecalculated intake were still under maximal intake 0,074 mg/kg.day. The circumstance was also true for Pbthat the intake do not exceed 0,00065 mg/kg.day. Based on risk characterization result, it can be concludedthat level of total risk in all places was less than unity so it implies that in those area was safe for dailyactivities in specified time with respect to pollutants of interest. However the relative high risk was pointedout to the Ahmad Dahlan street and the lowest risk was in the Magelang street. Average total risk inYogjakarta city was 0,034.
TEGANGAN SEKUNDER PADA STRUKTUR RANGKA BATANG Purba, Parhimpunan
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (162.14 KB) | DOI: 10.14710/teknik.v28i2.2134

Abstract

In our previous analysis of trusses, it was always assumed that the truss members are joined by ideal hingesand that loads are applied only at joints. The centroidal axes all of members are stright, coincide with thelines connecting the joint center, and lie in a plane that also contains the lines of action of all the loads andreaction. Thus the members of truss are subjected to axial force only, and these can be determined by staticmethod. A stress analysis base on these assumtion leads to the determination of so – called “primarystresses”.In actual cases the joint are usually riveted or welded; and because of this fact the members undergo, notonly axial forces, but also bending stresses from secondary moment, cuased by this condition are called“secondary stresses”. In discusing secondary stresses we shall consider only trussses in one plane andassume that this plane represents the plane of symmetri for all members and that external loads are acting inthe same plane. Of these the most important are caused by the fact that the joint are rigid, and hence themembers are not free to change their relative directions when the truss is deformed. This problem canlikewise be solved very eficiently by means of moment distibution.From the first analyze result, it was obtained the scondary tension ratio with the primary tension at the pullshaft about 19.20 %. This result is significant that it will increase the existence of primary tension. At theanalyze by SAP 2000 is obtained that the end tension much more lower than the scondary tension in the firstanalyze. This is need to obtain attention at planning trusses.
PENAMBAHAN HAMBATAN DALAM PERHITUNGAN TAHANAN KAPAL AKIBAT GERAK KAPAL PADA GELOMBANG Ariany, Zulfaidah
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (124.112 KB) | DOI: 10.14710/teknik.v28i2.2147

Abstract

Addition of resistance in calculation of ship resistance effect of ship motion at wave. Six natural degree offreedom by a ship thai is surging, swaying, heaving, rolling, pitching and yawing.In general movement bounce up ship have very complex geometry form and is influencing each other, eachother couple in an style system.Degradation of speed at ship done and conducted by at sea transport wayving (including wind) aim to avoidto damage or effect from green water on deck, slamming, racing propeller, and others. Is so that concludedthat calculation of ship resistance at ship progressively increase effect of ship motion at wave
PEMBUATAN BIODIESEL DARI MINYAK GORENG BEKAS DENGAN PROSES CATALYTIC CRACKING Buchori, Luqman; Widayat, Widayat
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (395.817 KB) | DOI: 10.14710/teknik.v28i2.2116

Abstract

Crude oil is a source of energy which is not be renewable. This fact motivates so much countries ineconomizing on fuel. Many researches have been done to gets another fuel substitute the crude oil.Biodiesel is represented as fuel instead of diesel fuel, and it is produced from vegetable oil. In the otherside, ex-cooking oil is waste-product from food industry, restaurant and household which is potential tobe alternative fuels because of the high contents of carbon and hydrogen atoms. Commonly the biodieselmade from vegetable oil by esterification and transesterification process. But if using esterification andtransesterification process to ex-cooking oil material, it is not economically feasible because the processmakes another reaction between alkaly catalist and oil to produce soap. One of biodiesel process iscatalytic cracking of the ex-cooking oil. This research is aimed to analyze zeolite catalist size effect(0.125mm; 0.3375mm; 0.425mm; 0.85mm; 1.18mm), and acid concentration on the product (2N; 3N;4N). This result shows that at 4N acid concentration and 0.125 mm zeolite catalist size is optimal whichcan reach diesel specification.

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