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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 539 Documents
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KAJI NUMERIK DAN EKSPERIMENTAL PERPINDAHAN PANAS PADA KONDENSER BERPENDINGIN UDARA Prihadi Setyo Darmanto; Dedy Dwi Arjanto; Muhammad Ismail
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.
ANALISIS PERUBAHAN SIFAT MEKANIK DAN STRUKTUR MIKRO BESI COR NODULAR 700 SETELAH MENGALAMI PROSES PERLAKUAN PANAS Rochim Suratman; Beny Bandanadjaja
Mesin Vol. 17 No. 2 (2002)
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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.
MODEL MATEMATIS DAN SIMULASI PERPINDAHAN PANAS PROSES PENGECORAN KONTINYU BAJA SLAB Prihadi Setyo Darmanto; Arief Syahlan; Koesnohadi Koesnohadi
Mesin Vol. 17 No. 2 (2002)
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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 Bagus Budiwantoro; Arief Teguh Hermawan
Mesin Vol. 17 No. 2 (2002)
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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; J Swevers; H. Van Brussel
Mesin Vol. 17 No. 2 (2002)
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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 IGN Wiratmaja Puja; Rochim Suratman; Agus Suprihanto; Reza Reza; Henry Ako
Mesin Vol. 17 No. 2 (2002)
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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 KEANDALAN DALAM PERANCANGAN TEKNIK, STUDI KASUS SISTEM KENDALI ELEVATOR PESAWAT CN235-220 I Wayan Suweca; Rosyidin Sufyani
Mesin Vol. 17 No. 3 (2002)
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Abstract

This paper presents a reliability analysis of elevator control system for CN235-220 aircraft. The analysis is carried out using Bayes theorem. Reliability analysis is performed for several system configurations, existing system and two modified systems. Reliability calculation shows that one of the modified systems has reliability relatively higher than the existing system. To insure all requirement needed, the other analysis i.e. strength, stability, etc. must be conducted for the modified system.
PERANCANGAN ALGORITMA PENJADWALAN PEMBUATAN CETAKAN SESUAI DENGAN DUE DATE JADWAL PELEBURAN LOGAM UNTUK MENDUKUNG KONSEP SISTEM PRODUKSI TERDISTRIBUSI MANDIRI ( STUDI KASUS SEKSI FOUNDRY PT. BANINUSA INDONESIA ) Yatna Yuwana Martawirya; Bagus Arthaya; Yanni Yanni
Mesin Vol. 17 No. 3 (2002)
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Abstract

At this moment, manufacturing industries in Indonesia must have high flexibility that can quickly responds dynamic changes in production processes. Autonomous Distributed Manufacturing System (ADiMS) is one of the production system alternative that can increase system flexibility with ability to adapt dynamic changing condition in the system.ADiMS is a production system where productions elements are independent, which planning process and production control is distributed to each independent element. Each of production's element has autonomy in running the monitoring, taking the decision, controlling, and communications functions with the other production's elements. Because each of the production elements take the decision independently, there should be a coordination of decision making result so the conflict will not occur among independent production elements.In this research AdiMS concept is applied in Foundry section at PT. Baninusa Indonesia. The task is to make a sand mold producing schedule based on the schedule of melting of cast iron or cast steel so it can support cast's order and filling the customer order. This research is done with the help of application program that specialized developed so it is hoped will make results a better scheduling of making sand mold casting.
ANALISIS KELURUSAN GERAK DAN PEMOSISIAN MEJA MACHINING CENTER MILLAC 4H Komang Bagiasna; Darto Darto
Mesin Vol. 17 No. 3 (2002)
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Abstract

Accuracy measurements were carried out on a table movement of four axis machining center using laser interferometer based integrated measuring system. In this case the measurements included table positioning accuracy in x-axis direction and table angular as well as table straightness displacement accuracy. Following the obtained results, analysis of the machining center table displacement was carried out by modeling the table accuracy movement using a homogenous transformation matrix (HTM) method. Guide ways deflection was analyzed using five contact point method and other analysis performed by taking into account misalignment between ball screw & slideways. Diagnosis was conducted by comparing the theoretical table accuracy displacement curve and the one obtained from laser interferometer based measurement, for determining the slideways wear contour and the progressive wear of the ball screw.
ANALISIS KETIDAKSTABILAN PARAMETRIK MEKANISME EMPAT BATANG ELASTIK Syamsul Huda; Andi Isra Mahyuddin
Mesin Vol. 17 No. 3 (2002)
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Abstract

The need to increase operational speed and reduce the inertia effects led to the design of slender members. Consequently, elasticity of these members could no longer be neglected. The elasticity results in varying stiffness of the elastic member leading to parametric excitation. The dynamic behavior of an elastic coupler of a four-bar mechanism is investigated. The governing equation is nonlinear, partial differential equation with time-varying parameters. Perturbation method is employed to linearize the equation and the dynamic response is obtained using a closed-form numerical solution algorithm constructed through the discretization of the parameters continua. The dynamic stability of the system is evaluated based upon Floquet Theory. The results are presented in the form of parametric stability charts, and the dynamic stability analysis results were validated by a direct-integration method. The response become unstable at several bands of frequency. The effects of external force, damping and ratio of follower-to-coupler mass were examined. Results show that increase in tensile force, damping, and the mass ratio increased the stability of the elastic coupler.

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