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INDONESIA
Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 5 Documents
 1 
Search results for , issue " Vol 17, No 2 (2002)" : 5 Documents clear
MODEL MATEMATIS DAN SIMULASI PERPINDAHAN PANAS PROSES PENGECORAN KONTINYU BAJA SLAB Darmanto, Prihadi Setyo; Syahlan, Arief; Koesnohadi, Koesnohadi
Mesin Vol 17, No 2 (2002)
Publisher : Mesin

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Abstract

This paper presents mathematical model and numerical simulation using CFD software FLUENT 5.4 applied on continuous casting process of steel slab. The distribution of temperature of the steel slab since it exits the mould till straightening region was evaluated. The result of numerical evaluation was also compared to the measurement temperature taken at some selected points. The comparison showed that there was a good agreement between the numerical result and the measurement data. The percentage of both liquid and solid phases along the slab was also simulated. It seems that the simulation of solid phase growth could be used as a method for determining the cross section position where the solidification ceases.
DESAIN GEOMETRI SCREW PRESS DENGAN METODE NUMERIK ELEMEN HINGGA Budiwantoro, Bagus; Hermawan, Arief Teguh
Mesin Vol 17, No 2 (2002)
Publisher : Mesin

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Abstract

Screw Press is one of the main component of Crude Palm Oil (CPO) extraction machine. Until these days, the Indonesian CPO industries still import this component from Malaysia with longer delivery-order period that means a problem for productivity. This paper was written as alternative solution for Screw Press geometrical design by doing some engineering analysis. The analysis was limited to the geometrical design matter of component by modifying the fillet part and thickness of screw, and also analyzing the surface pressure of component. Finite element model was developed using MSC.Nastran software package. The results of overall analysis show that the reduction rate of stress concentration as the effect of increasing fillet radius is 12% per 5 mm and the reduction rate of maximum stress as effect of increasing screw thickness is 9% per 2 mm. Surface pressure caused by loading is linear with fillet radius and its value is about 0,1 times of the mean principal stresses.
ROBUST IMPEDANCE ADAPTIVE CONTROL FOR CONSTRAINED MOTIONS Indrawanto, Indrawanto; Swevers, J; Brussel, H. Van
Mesin Vol 17, No 2 (2002)
Publisher : Mesin

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Abstract

This paper presents a robust adaptive impedance control for robot manipulators. The robust adaptive impedance control is designed to obtain fast and accurate force tracking. The proposed controller does not require special knowledge of robot dynamics and environment models. Lyapunov-based Model Reference Adaptive Control is used to establish a global stability of the tracking errors. Experimental results on an industrial robot are presented to verify the force tracking performance of the proposed controller.
ANALISIS KEGAGALAN DRUM REM PRODUKSI UKM UNTUK TRUK/BUS DENGAN DAYA MESIN 190 HP Puja, IGN Wiratmaja; Suratman, Rochim; Suprihanto, Agus; Reza, Reza; Ako, Henry
Mesin Vol 17, No 2 (2002)
Publisher : Mesin

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Abstract

Indonesian small and medium industries (UKM) have the ability to produce relatively cheap truck/bus brake drums, but the quality is needed to be improved. The drums usually fail in form of cracks or fractures before the design life is reached. This paper presents failure identification of the UKM’s brake drums that is including material aspects, operational loading, and stress analysis. The mechanical and physical properties of the materials are studied by conducting tensile test, hardness test, chemical composition, and metallography. Fractography is also conducted to study the type and process of the failures. The brake loads are analyzed for various operational conditions such as straight, curved, and downhill path, with various value of decceleration. Stress analysis of the drum due to the applied loads is conducted using finite element method. The complete analysis shows that the UKM’s drums are not strong enough for the applied braking load. It is also observed that the crack locations are in agreement with the highly computed stressed areas.
ANALISIS PERUBAHAN SIFAT MEKANIK DAN STRUKTUR MIKRO BESI COR NODULAR 700 SETELAH MENGALAMI PROSES PERLAKUAN PANAS Suratman, Rochim; Bandanadjaja, Beny
Mesin Vol 17, No 2 (2002)
Publisher : Mesin

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Abstract

Ferro casting ductile 700 (FCD 700) is a ferrous material with carbon content > 2 %. It has pearlitc microstructure with a little amount of ferrite and nodular graphite. In as-cast condition FCD 700 has tensile strength 700 N/mm2 , elongation 2 % min. , hardness 229 – 302 BHN and impact value 7 joule. Heat treatment process is a process that can be executed to ferrous material. With heating the material until a range of austenite temperature then controlling the cooling rate. The objective is to repair or to modify the mechanical properties of material belongs before. In this article there’s a research about how far the exchange of mechanical properties or microstructure in FCD 700 if it being heat-treated. Cooling rate is given by isothermal and continuous condition. The variation of cooling rate and holding in some isothermal temperature is also accomplished. Research data affirm some gradation of mechanical properties and microstructure. The variety associate with cooling rate and isothermal holding which is performed.

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