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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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PACK CARBURIZING PADA SPROCKET SEPEDA MOTOR DENGAN MATERIAL BAJA KARBON RENDAH Setiamarga, Budi Hartono; Kurniawati, Novi; Rumendi, Umen
Mesin Vol 21, No 1 (2006)
Publisher : Mesin

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Abstract

High quality motorcycle sprocket with cheaper price has been achieved by giving additional processing to non original locally made sprocket such that it has an almost the same quality as the original Japanese made sprocket . The additional processing was pack carburizing which was done to the non-original sprocket, followed by quench hardening and tempering so that the quality of the non-original sprocket will be almost the same as the original sprocket. Pack carburizing was applied with active carbon as the carbon source and 10% BaCO3 as the energizer. This process was done at 950°C and one hour holding time. For heat treatment, the heating was done at 850°C for 15 minutes, followed by water quenching and tempering at 150°C for 30 minutes. The carburizing result indicated that there was a carbon penetration depth of about 1.05 mm. After tempering, an effective case depth of about 0.2 mm was achieved. The process variables for obtaining an effective case depth of original sprocket (0.2 mm) are selected by applying pack carburizing using active carbon granule with 10%wt BaCO3 as the carburizing medium, processed at 950°C for an hour, followed by water quenching from 850°C and tempering at 150°C for 30 minutes.
PERANCANGAN DAN STUDI KARAKTERISTIK PRFSSURIZER PADA UNTAI UJI NILO-1 UNTUK TEKANAN NOMINAL 6 MPa Suryanto, Hari; Suwono, Aryadi
Mesin Vol 11, No 1 (1996)
Publisher : Mesin

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Abstract

Pada reactor air bertekanan, pressurizer mempunyai peranan yang sangat penting diantaranya yaitu sebagai surge-tank untuk menampung perubahan volume dan sebagai pengendali tekanan pendingin primer pada berbagai kondisi perubahan beban reactor yang sangat erat kaitannya dengan system keselamatan. Pemahaman yang mendalam dari gejala yang berlangsung pada alat ini merupakan landasan utama baik untuk perancangannya maupun prediksi karakteristiknya terutama saat berlangsung kelalaian kondisi operasi dari reaktor. Untuk tujuan pemahaman tersebut dengan bertitik tolak dari persamaan kekekalan massa dan energy untuk volume atur serta persamaan tingkat keadaan dilakukan analisis untuk perancangan dan prediksi karakteristik sebuah model pressurizer yang bersesuaian dengan kondisi operasi untai uji NILO-1 pada tekanan operasi nominal 6 MPa. Melalui penerapan metode numeric untuk menyelesaikan persamaan differensial dilakukan simulasi kondisi operasi model pressurizer hasil rancangan termasuk respon waktu yang berlangsung pada saat mengalami kondisi operasi.
STUDI BLOCKAGE EFFECT TERHADAP ALIRAN PADA KONFIGURASI WING-BODY FAIRING Rozi, Khoiri; Sasongko, Herman
Mesin Vol 23, No 2 (2008)
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Abstract

The study was performed to acquire information on the qualitative flow condition and dynamical blockage effect on wing-body fairing configuration. The study was used to computational fluid dynamics to provide the pathlines patters and the total static pressure distribution in the vicinity junction region. Results of study in the research indicated that flow pattern influences by variation of angle of attack. As increasing of angle of attct so that the saddle point position move in to pressure side and away from wing surface. Meanwhile, separation line or imprint horseshoe vortex due to increasing angle of attack became more than opened. Results of total static pressure distribution show that the blockafe effect area seems deeply on incoming trailing edge location. Therefore, as increasing of angle of attack will be blockage effect to fluid flow on pressure side and suction side stronger.
EFFECTS OF HYDROGEN ADDITION INTO INTAKE AIR ON THE HYDROCARBON EMISSION OF GASOLINE ENGINES AT COLD START CONDITION Hariyanto, Arief; Arismunandar, Wiranto; Engel, Gerard George
Mesin Vol 22, No 2 (2007)
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Abstract

Start process, particularly cold start condition is considered important to be focused in terms of emission reduction due to high unburned hydrocarbon (HC) concentration in the exhaust gas. Several methods have been proposed and implemented for reducing exhaust gas emission during starting condition. In this paper will be discussed the addition of hydrogen into intake air in order to reduce the level of HC emission during cold start condition. Using this method, the combustion process during starting will be improved to produce better combustion. This paper describes an experiment conducted to find the optimal amount of hydrogen added on start process at various coolant temperatures, which is effective to reduce the total HC concentration at each start temperature, respectively. The results show that the HC concentration in the exhaust gas is influenced by the temperature of engine and can be reduced significantly by hydrogen addition into intake air.
ANALISIS TEORITIK DAN KAJI EKSPERIMENTAL UNTUK MENENTUKAN KEKAKUAN STATIK DARI BANTALAN ROL Iskandar, Ishak S; Bagiasna, Komang; Abidin, Zainal
Mesin Vol 12, No 2 (1997)
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Abstract

This paper describes theoretical and experimental study of the static bearing stiffness. This research is motivated by the role of bearing stiffness in determining the natural frequency of a rotor-shaft system. Previous investigators, White and Harris, have developed an analytical tool to calculate the bearing stiffness. However, this analytical results were not supported by experimental data. In this work, an experimental study was done in order to determine the static bearing stiffness. These experimental results are then compared to those obtained by White and Harris analysis. The analysis and experimental study will pave the way toward the determination of the dynamic bearing stiffness.
THE ENERGY CONSUMPTION OF REFRIGERATOR USING CFC 12 AND HFC 134A Budihardjo, Budihardjo
Mesin Vol 14, No 2 (1999)
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Abstract

A market survey found ± 7 companies registered to assemble refrigerators, with annual production capacity 600,000 units (1995) using CFC 12 as a refrigerant. The Association of Indonesia Electric Appliance Manufacturers and Suppliers has decided to convert refrigerant from CFC 12 to HFC 134a by January 1998. The influence of ODS and non ODS substances in refrigerators on energy consumption has been performed. The energy consumption of a manually defrost, single door, 150 Liter typical capacity refrigerators were measured at the Refrigerator Testing Laboratory University of Indonesia based on the protocol of ISO 7371 (E) 1995 under the ambient temperature of 30 "C with relative humidity between 60 % to 75 %.The averaged energy consumption of 7 units CFC-refrigerator were between 1. 11 and 1.38 kWh/24h, and for the HFC 134a-refrigerators between 1.03 and 1.22 kWh/24h. The energy consumption differences were approximately between 2 to 16 %.
KINEMATIKA TRANSMISI CYCLO Sutjiatmo, B
Mesin Vol 1, No 1 (1982)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (108.548 KB) | DOI: 10.5614/MESIN.1982.1.1.3

Abstract

Perkembangan pengetahuan tentang kinematika, kinetika,teknik produksi dan material telah menghasilkan suatu sistem transmit reduksi putaran yang emptmyai perbandingan putaran konstan, efisiehsi, ringan, kompak dan batons. Sistem transmisi ini disebut Cyclo dan akan segera merupakan altematif tain yang tebih unggul disamping transmisi roda gigi. Dalam tulisan ini akan diperkenal- kqn dan diunfukkan kinematika sistem trasmisi Cyclo tersebut.
KAJI EKSPERIMENTAL PENGARUH WAKTU PENAHANAN CAIR TERHADAP PEMBENTUKAN GRAFIT BULAT PADA PROSES PENGECORAN BESI COR NODULAR 700 Suratman, R; Widodo, R
Mesin Vol 15, No 3 (2000)
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Abstract

Nodular graphite on iron casting can be formed because of the present of Mg element from 0.02% - 0.05%, which is alloyed with iron base material to form FeSiMg through inoculation effect. At the pouring stage, especially in continuous production, Mg in the melting fluid and its inoculation effect decrease so that the formed graphite will not round as expected and certainly weaken its mechanical properties.This writing discuss the maximum holding time for the melting fluid in a ladle to assure acceptable mechanical properties, through experimental analysis of roundness of nodular graphite and tensile strength of the material by casting it in every 2 minutes right after adding the Mg element.By referring to the decreasing Mg, iron fluid can be held up to 100 minutes, provided that the iron fluid contain maximum 0.01% Sulfur and maintained to the lowest holding temperature without ignoring pouring temperature standard for iron, maximum temperature in the ladle set 1400 “C. However, the tensile strength will be decreased to the acceptable value only up to 24 minutes, as a result of refraction of graphite that is affected by decreasing inoculation effect.
DAMPAK INDUSTRIALISASI TERHADAP PERKEMBANGAN PENDIDIKAN BIDANG TEKNOLOGI MESIN Diran, O; Suwono, A
Mesin Vol 2, No 1 (1983)
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Abstract

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OPTIMALISASI SALURAN PENAMBAH PADA CORAN ROLL PRESS Suratman, Rochim; Yudiyanto, Oyok
Mesin Vol 17, No 1 (2002)
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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.

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