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Sugeng Tirta Atmadja
Dosen Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro. Jl. Prof. Sudharto, SH., Tembalang-Semarang 50275, Telp. +62247460059
Mechanical Engineering

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PENGARUH JARAK SWIRL FAN TERHADAP LAJU PENURUNAN TEMPERATUR CASE, HAMBATAN TERMAL DAN EFEKTIFITAS FIN PADA EXTRUDE FIN Atmadja, Sugeng Tirta
ROTASI Volume 8, Nomor 4, Oktober 2006
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (432.925 KB) | DOI: 10.14710/rotasi.8.4.41-49

Abstract

In the electronical series, the cooling upon electronical component is highly required. In this final assignment, the writer discusses about the effect of cooling using swirl fan effect with distance variation which is usually called as a wind flow effect. This effect is obtained from the fluids flow turned by a fan, in which the direction of fluids flow is spreed by fan located between the source of flow and cooled component. By using swirl fan effect which its distance is modified, it is expected to increase turbulence effect of fluids flow and recognize the most optimum distance that will effect to the flow of air cooling. The used distance variation are 1cm, 3cm, 5cm, 7cm, 9cm and 11cm. By using the method, the fast heat cooling is generated. The standard of swirl fan effect using is by not using swirl fan, so that the flow is just let without any obstacles. The existing result indicated that the using of swirl fan effect on the distance of 3cm is more optimum than on the other distance and it is better than the one wich does not use swirl fan. In the speed of 6,6 m/s for all variation, the power generates smaller thermal resistance than the speed of 2,8 m/s and 4,3 m/s and the effectivity in the condition without swirl fan is better than the fin using swirl fan for both kinds of heat sink
ANALISA HEAT EXCHANGER KNL 5-2015 DENGAN TEKNIK KONTROL FUZZY Atmadja, Sugeng Tirta
ROTASI Volume 9, Nomor 1, Januari 2007
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (455.872 KB) | DOI: 10.14710/rotasi.9.1.52-59

Abstract

Suatu mesin transmisi penerus putaran dan daya di dalam gearbox menggunakan oli atau minyak pelumasyang berfungsi sebagai pendingin dan juga berguna untuk mengurangi gesekan yang terjadi. Akan tetapi oli tersebutjuga membutuhkan pendinginan yang dinamakan heat exchanger. Selama ini metode yang digunakan dalam duniaindustri, kebanyakan menggunakan metode kontrol konvensional yaitu on-off dan kecepatan aliran yang konstan.Namun demikian, terkadang metode kontrol konvensional kurang mampu bekerja sesuai dengan yang diharapkan,sehingga memungkinkan untuk mengaplikasikan metode kontrol yang lebih modern, salah satunya adalah denganteknik kontrol fuzzy.Heat exchanger merupakan salah satu bagian alat di mesin finish mill yang terdapat di PT. IndocementTunggal Prakarsa Citeureup yang berfungsi untuk menurunkan temperatur oli dan menjaga suhu pada keadaan normalsekitar 480C, dengan mengatur kecepatan aliran oli masuk dan keluari. Pada keadaan tunak, output temperatur olitidak sesuai dengan setting point-nya walaupun hanya terdapat sedikit perbedaan Hal ini menunjukkan bahwa dalampraktek variabel kontrol tidak selalu sama dengan set-point, disebabkan adanya faktor dinamika dari proses yangdikendalikan, juga pengaruh faktor lingkungan
ANALISA KELUAR REL KERETA API Atmadja, Sugeng Tirta
ROTASI Volume 3, Nomor 1, Januari 2001
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (73.155 KB) | DOI: 10.14710/rotasi.3.1.33-38

Abstract

journey beside that, “derailment” that caused high speed can threaten passenger’s life. There are two cases willbe discussed :1. “Kontel-moment” consequence centrifugal force when train to be in motion on rail-road which has bend archwith certain radius.2. “Quasi static effect” that cause derailment.
PENGENDALIAN KOROSI PADA SISTEM PENDINGIN MENGGUNAKAN PENAMBAHAN ZAT INHIBITOR Atmadja, Sugeng Tirta
ROTASI Volume 12, Nomor 2, April 2010
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (476.792 KB) | DOI: 10.14710/rotasi.12.2.7-13

Abstract

Corrosion is defined as the destruction or deterioration of a material because of reaction with its environtment. Corrosion can attack all kinds metals. Corrosion can occur at cooling system which always contact with water. It is caused by chemical reaction between metal surface and water. This corrosion can be controlled by adding inhibitor substance into cooling system. Inhibitor is a substance that when added in smalled concentration to an environtment decrease the corrosion rate. With adding inhibitor properly into cooling system, agresivity of corrosion attack will be reduced. Therefore we keep performance of cooling system.
ANALISA CACAT COR PADA PROSES PENGECORAN BURNER KOMPOR Atmadja, Sugeng Tirta
ROTASI Volume 8, Nomor 3, Juli 2006
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (416.18 KB) | DOI: 10.14710/rotasi.8.3.41-46

Abstract

Objective of this research is to analyse casting defect in burner casting process. The research have been conducted in Small Medium Enterprise PT. Suyuti Sido Maju. Casting deffects were observeb by visual inspection. There are some casting deffect such as : cold shut, shearing and void.Composition of casting product, pouring temperature and characterization of sand casting have been done to investigate the casting process that caused casting deffect.
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