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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
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Articles 5 Documents
 1 
Search results for , issue " Vol 17, No 1 (2002)" : 5 Documents clear
OPTIMALISASI SALURAN PENAMBAH PADA CORAN ROLL PRESS Suratman, Rochim; Yudiyanto, Oyok
Mesin Vol 17, No 1 (2002)
Publisher : Mesin

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Abstract

The high yield rate of casting product indicates the efficiency of casting process. Yield of casting is defined as a ratio between the casting weight to the total weight included the riser and gating system. Increasing yield could be accomplished through the optimizing of riser. Trial and error of the existing alternative designs is the most commonly method. This requires a lot of time and money. Computer software is used in order to reduce this effort. The applied software is AFS solidification system which enable us to simulate the cooling and solidification process. The alternative designs could be simulated on the computer. By using FCD 700 as the base material of Roll press, the research gave an increase of yield, i.e. from 68,5 % yield to 76,6%. yield This is significant for a casting weight of 139 kg.
SIMULASI PERAMBATAN RETAK LELAH PADA POROS AISI 1045 YANG DIKENAI BEBAN DINAMIK LENTUR AMPLITUDO TEGANGAN KONSTAN Akhyar, Akhyar; Joenoes, Ahmad Taufik; Suprijanto, Syoni
Mesin Vol 17, No 1 (2002)
Publisher : Mesin

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Abstract

The current research was carried out to study the change of stress intensity factor (KI) on the semielliptical cracked crank subject to a constant amplitude cyclic loading. This research was also carried out to find the fatigue crack propagation model, the critical crack depth and to predict the fatigue life. The study was performed by using computer modeling and simulation, verified by series of fatigue tests on 15 mm diameter rod specimens made of AISI 1045 steel. The crack (0.5 mm) was introduced on the specimen surfaces as a crack initiation site. The result shows that, for the same crack depth, the higher the loading magnitude, the higher the stress intensity factor, and also, at the end of the crack propagation, semi-elliptical crack tends to be semi-circular one, or a/c ratio approaching unity (1.0). The fatigue experiment has been successfully verified that the critical crack depth and the fatigue life lie within 89% to 92% accuracy, and 8% to 10% deviation , respectively, compared to those obtained by the computer simulation. Fractography study has also revealed that the fracture path consist of; i) crack initiation site, ii) crack propagation, as indicated by beach mark, and iii) the final fracture.
MINIATUR SISTEM TRANSFER FLEKSIBEL DENGAN PENGENDALIAN TERDISTRIBUSI MENGGUNAKAN PLC Martawirya, Yatna Yuwana; Kusuma, Akhmad Hery; Pamungkas, Yohanes Kurnia
Mesin Vol 17, No 1 (2002)
Publisher : Mesin

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Abstract

The objective of the present research is to develop a miniature of a module of the Flexible Transfer System (STF). STF is the alternative solution of system transportation in advance manufacturing system environment which considered flexible on its components. The flexibility that can be fulfilled by STF is the flexibility in a route of transportation and the ability to be developed in the future. For these purposes, the control architecture of STF is designed to be distributed and each of the controllers has autonomy to carry out decision making based on its condition. At this research a miniature of STF that consists of a mechanical system module, an executor controller, and a manager controller has been developed, and the communication among the distributed controllers has been carried out and successfully.
KAJI NUMERIK DAN EKSPERIMENTAL PERPINDAHAN PANAS PADA KONDENSER BERPENDINGIN UDARA Darmanto, Prihadi Setyo; Arjanto, Dedy Dwi; Ismail, Muhammad
Mesin Vol 17, No 1 (2002)
Publisher : Mesin

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Abstract

This paper presents numerical and experimental study of the heat transfer on fins-tube heat exchanger that was employed as an air cooled condenser of the air conditioning system. In this case change of phase occurs on refrigerant side while air remain at gas phase. The proposed numerical analysis is based on the application of mass and energy balances implemented at a small control volume that is part of the condenser. The result of numerical evaluation was then compared with the experimental observation. A good agreement between experimental and numerical results was achieved and the numerical method is proposed that to be used as a tool for fins tube condenser design.
UJI COBA PROFIL AUS UNTUK MENGURANGI KEAUSAN FLENS RODA GERBONG KKBW KA BABARANJANGK Dahlan, Dahlan; Soemantri, Satryo
Mesin Vol 17, No 1 (2002)
Publisher : Mesin

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Abstract

This research aims at finding out the impact of the change of wheel-tread profile from conical profile of 1:40 to worn profile of ORE S 1002 against the wheel wear rate of the cars. To find out the impact of the change of the wheel-tread profile on the ride quality, ride index is measured at the initial stage of the test. The result shows that the ride index value – horizontal as well as vertical – of the test car is better than that of the reference cars. The wheel wear rate of the test car with worn profile is much lower than that of the reference cars. The lifetime of the reference cars’ wheels is around 40 months (± 458,182 km), while the test car with worn profile is estimated to reach 80 months (± 916,364 km).

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