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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 22, No 1 (2007)" : 5 Documents clear
PENGARUH WAKTU AUSTENITISASI PADA PROSES PELARUTAN KARBIDA BAJA MANGAN AUSTENITIK Widyanto, Bambang; Sambas, Achmad
Mesin Vol 22, No 1 (2007)
Publisher : Mesin

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Abstract

Austenitic manganese steel is used for components which need good wear resistance and impact resistance. The application examples of austenitic manganese steel castings are in the mining industries such as rock crusher and dredge buckets, and in transportation industry, this material was used in railroad track work such as frog. However as-cast austenitic manganese steel is brittle with low toughness due to the presence of carbides. Hence, the as-cast austenitic manganese steel should be solution treated to dissolve the carbides into austenite phase, to improve its mechanical properties. Additionally, this research is enriched by using thickness parameter, to understand the influence of the dimension. The chemical composition in the casting process is in accordance with ASTM A 128 grade A. The solution treatment processes was done using a step heating procedure at temperature 575oC and 1050oC and determined heating time. Heating temperatures were determined based on Fe-Mn-C phase diagram and by the previous researches. Holding time was determined based on the literature, and heat transfer simulation result. The effects of the solution treatment were observed in the microstructure, grain size, and hardness of the specimens to obtain the optimal solution treatment that can be used. The objective of this research is to find the suitable heat treatment method in order to produce the desirable material properties and in this case, 160HB was obtained.
OPTIMASI PELAPISAN MATERIAL PEREDAM VISKOELASTIK PADA STRUKTUR PELAT ELASTIK Suweca, I Wayan; Yusuf, Mokhamad Nuriman
Mesin Vol 22, No 1 (2007)
Publisher : Mesin

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Abstract

This paper discusses a method to optimize the distribution of viscoelastic-damping layer on elastic plate structures. This method is based on well known SUMT (Sequential Unconstrained Minimization Technique) algorithm. An innovation where elements’ strain energy distribution over the plate structure is used to determine the search direction vector. The method models the two layers damped plate as a single layer damped plate. The mechanical properties of single layer damped plate were determined such that they are equivalent to those of two-layers elasticviscoelastic laminate. MSC/Nastran finite element software was used to calculate the dynamic characteristics and the elements’ strain energy distribution of the single layer plate. The proposed innovation has successfully determined the optimum distribution of viscoelastic material. The results show that the optimum distribution of viscoelastic material on elastic structure is strongly influenced by structural support type and number of modes retained for the analysis.
KARAKTERISTIK AERODINAMIS DUA SILINDER TERIRIS TYPE 1 YANG TERSUSUN SIDE BY SIDE PADA BILANGAN REYNOLDS SUBKRITIS Siregar, Indra Herlamba; Muis, Abdul
Mesin Vol 22, No 1 (2007)
Publisher : Mesin

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Abstract

Experimental studies of aerodynamics characteristics of two cylinders type I in side by side configuration at sub-critical Reynolds number were carried out at open circuit of subsonic wind tunnel. Gap of side by side configuration T/D was varied from 1.1 to 4 and sliced angle both of frontage an behind cylinder at 45°, 53° and 65°. Total drag reduce since gap of cylinders increase for sliced angle 45° and 53° but increase for sliced angle 65°. Bias flow phenomenon showed at close and moderate gap of cylinders tend to symmetries at width gap. Visualization have done with smoke method to get more information about characteristics of two cylinders type I in side by side configuration
KAJI NUMERIK DAN EKSPERIMENTAL PENYERAPAN ENERGI TABUNG ALUMINIUM BERGALUR DENGAN BEBAN AKSIAL Hadi, Bambang K; Putra, Ichsan S; Basuki, David; Tedy S, Yanyan
Mesin Vol 22, No 1 (2007)
Publisher : Mesin

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Abstract

Grooved tubes under axial compression are widely used as efficient energy absorption structures. The energy absorption uses plastic folding mechanisms that are formed during the loading. In this paper, the behaviors of grooved tubes under axial compression loading are discussed. The diameter of the tubes is 100 mm, with 2 mm thickness and the length is 72 mm. The number of grooves is 3 and 7, with the groove’s depth is 1 mm. The study uses analytical method, numerical method using explicit dynamic of ABAQUS as well as experimental methods. The results show that increasing the number of grooves will reduce the mean crushing load, Pm. The numerical analysis is able to predict precisely the final plastic folding form of the tubes compared to the experimental results. The difference of Pm among the three methods varies between 1 – 20%. Further investigation is needed to reduce the differences. In all the studies conducted here, the mean crushing loads of the experimental data are always greater than both numerical and analytical methods.
PEMBUATAN DAN PENGUJIAN SENSOR ULTRASONIK SEBAGAI FEEDBACK PADA SISTEM KENDALI OTOMATIK PITCH ATTITUDE HOLD Zaeny, U. M; Indriyanto, T; Muhammad, H
Mesin Vol 22, No 1 (2007)
Publisher : Mesin

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Abstract

Standard altimeter, i.e. static tube, does not work accurate enough for vehicle flying several meters from the ground. One alternative for measuring altitude in this case is using ultrasonic range-meter. This idea is brought further by using two range-meters to measure pitch attitude. Laboratory experiments were conducted to study this idea statically by constructing them in an inclined moving bar and dynamically by arranging them in a Pitch Attitude Hold control system.

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