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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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KAJI EKSPERIMENTAL MOTOR BAKAR BENSIN 2 LANGKAH DENGAN SISTEM PENYEMPROTAN LANGSUNG BAHAN BAKAR MEKANIS PADA RUANG BAKAR Reksowardojo, Iman Kartolaksono; Setyawan, Aan; Sudarwanto, Budi; Syaharuddin, Ibrahim
Mesin Vol 18, No 1 (2003)
Publisher : Mesin

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Abstract

In this study, a mechanical fuel direct injection system is used in a two-stroke 70 cc gasoline engine. The injection system is using a high pressure pump (injection pump) and an injector (Nozzle) from a 5 hp diesel engine that mechanically is operated by a cam. The modifications on the two stroke gasoline engine are unthrottle intake system, additional hole in the cylinder head for the injector and a camshaft system. The camshaft is connected to the crankshaft. Theperformance of the engine is tested and the result is compared with the performance of the carburetor system engine in the same testing condition. The performance of the direct injectionsystem engine is better than the carburetor system engine in 1600-1750 rpm range. The power of the engine increases in about 143%, the specific fuel consumption decreases in about 35%, the thermal efficiency increases in about 59%, the air intake increases in about 244%, the scavenging efficiency increases in about 110% and the air-fuel ratio increases in about 116%. The improvement of the performance is caused by the increase of the air-fuel ratio also causing a lean combustion and an unthrottle intake process. But in other operation condition the mechanical fuel direct injection system cannot operate with good performance because the system cannot full fill the need of a complex system control.
PENELITIAN BATANG KAWAT JENIS SWRY 11 UNTUK KAWAT INTI ELEKTRODA LAS LISTRIK RD - 260 Batam W, Durman; Suratman, Rochim
Mesin Vol 4, No 3&4 (1985)
Publisher : Mesin

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Abstract

Tulisan ini mengetengahkan hasil penelitian terhadap batang kawat jenis SWRY 11 buatan dalam negeri, serta buatan Jepang sebagai pembanging. Di samping terhadap batang kawatnya, penelitian dilakukan terhadap kualitas logam las dan pengaruhnya pada kekuaran sambungan yang dihasilkan, Pembahasan dan kesimpulan ditinjau dari hasil pemeriksaan komposisi kimia, metalografi, makroets, uji tarik serta uji keras.
PERANCANGAN DAN PEMBUATAN ALAT UJI KOMPRESOR REFRIGERASI Adriansyah, Willy
Mesin Vol 20, No 1 (2005)
Publisher : Mesin

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Abstract

A compressor testing device based on vapor compression cycle has been designed and built successfully. Simple and easy operation is the main differences between the device and conventional compressor testing device. A reciprocating compressor performance was tested for two kind of refrigerants; R22 and HCR22 using this device. From the experimental results it is found that the isentropic efficiency can be represented by a two degrees polynomial function. The experimental results also shows that the isentropic efficiency of the compressor using R22 is higher compared to the same compressor using HCR22.
KAJI TEORIK KARAKTERISTIK PEMBAKARAN CAMPURAN BATUBARA-AIR (CBA) Suwono, Aryadi
Mesin Vol 8, No 1&2 (1989)
Publisher : Mesin

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Abstract

Melalui analisis termodinamika, karakteristik pembakaran campuran batubara-air (CBA) dengan contoh batubara dari Bukit Asam Tanjung Enim telah dikaji. Pengaruh konsentrasi terhadap nilai kalor ditunjukkan serta dibandingkan dengan bila batubara dari jenis standar. Demikian pula pengaruh suhu gas buang pembakaran terhadap kalor pembakaran dibahas.
APLIKASI METODE RAIMONDI DAN BOYD PADA PERBANDINGAN ANALISIS PERFORMANSI JOURNAL BEARING LOKOMOTIF YANG MENGALAMI BEBAN IMPAK Budiwantoro, Bagus; Firmansyah, Ridha; Puja, IGN Wiratmaja
Mesin Vol 21, No 2 (2006)
Publisher : Mesin

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Abstract

Axle Lining is a type of journal bearing at wheel driver shaft in which makes locomotive traction motor possible to be supported on the mover shaft. According to hydrodynamic lubrication theory, journal bearing is designed to work under hydrodynamic lubrication condition. Film layer between journal and bearing surfaces can give less contact between those surfaces. When the bearing is working, all performance parameters such as minimum film thickness, eccentricity ratio, bearing friction coefficient, lubricant flow, maximum lubricant pressure, temperature rise of lubricant, have to be achieved thus the bearing can reach the desired life and performances. Impact load, which works to bearing, is one important factor to be noticed because it can affect bearing performance comprehensively. Using numerical Raimondi and Boyd method which developed in form of computer program, the process to determine journal bearing performance calculation can be easier and give more accurate result. The application of this method for the calculation performance import and local product show that imported journal bearing work under hydrodynamic condition for low value of impact load up to 1500 lbf (6,68 kN). Local product work under elastohydrodynamic condition for low value of impact load up to 1000 lbf (4,45 kN). Critical impact load is 1500 lbf (6,68kN) for both product which calculated using Trumpler criteria .
PENGEMBANGAN PERANGKAT LUNAK UNTUK PENERAPAN TEKNIK PINCH DENGAN MELIBATKAN KENDALA RUGI TEKANAN Adriansyah, Willy; Suwono, Aryadi
Mesin Vol 11, No 2 (1996)
Publisher : Mesin

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Abstract

The existing software of pinch technique provide only the tool for the heat exchanger network design. To improve the reliability of the software, in particularly for retrofitting the existing system, several additional aspects need to be included. In this paper, an algorithm to determine the optimum condition of heat exchangers for a specified allowable head loss is proposed. With this new method, the retrofit design of an existing system can be done even by taking into consideration of using the existing fluid circulation systems (i.e. pumps and compressors). The proposed method of heat exchanger can also be used under the pressure drop constraints on both tube and shell sides.
CORE SUB-COOLED BOILING OF THE BANDUNG TRIGA 2000 REACTOR Kamajaya, K; P.R, Henky; Umar, E; Yazid, P. Ilham
Mesin Vol 23, No 2 (2008)
Publisher : Mesin

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Abstract

In 2000, the TRIGA 2000 reactor in Bandung completed a commissioning program and received an operating license at 2000 kW. The Indonesia regulatory body (BAPETEN) issued a 15-year license, to operate the reactor at 2000 kW. During the commissioning tests, bubbling at the reactor core was observed and considered acceptable by General Atomic experts. The sub-cooled boiling observed during the commissiong tests confirmed the predictions of the thermal hydraulics calculations performed by General Atomics and presented in the safety analysis report. In 2004 the operating staff of the Bandung TRIGA 2000 Reactor observed an increase in the amount and size of the bubbles emanating from the core and in January 2005 the BAPETEN after an inspection and discussion with the operating irganization decided to limit the reactor power to 1250 kW. In January 2005, IAEA team mission organize a favt-finding mission to have a better understanding of the safety implications of the reactor bubbling and to propose an action plan to address and solve the issue. Followint this obligation, BATAN submitted to the Agency the current verison of the SAR at the end of 2007. In March 2007, IAEA team mission came to Indonesia di review the SAR was combined with the follow-up on the recommendation from previous mission on investigation of core bubbling phenomena,
PENYELESAIAN PENDEKATAN PROBLEM KONTAK HERTZIAN PADA KASUS KONTAK ANTARA RODA DAN REL Parwata, I. M; Puja, I. W; Budiwantoro, B; Brodjonegoro, S. S
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

In this paper, an approach of the formulation for Hertzian contact problem between wheel and rail is presented. This formulation used analytic and numerical approach, especially in solving elliptic integrals in order to obtain dimension relations of the contact, deformation, contact pressure and stress contours. The main curvature radius range of the smaller rail are from 300-260 mm. Modeling with finite element solution was also performed as an alternative approach solution to the contact pressure. Besides, it is with Finite Element Method (FEM) can show the contact stress distribution and the influence of contact at a certain depth. The result of this formulation and Finite Element approach are compared with the model equation by Fischer and Wiest [1] and the exact value calculated by Hertzs equation [2]. The results showed that the calculation of the contact dimensions and maximum contact pressure give more conform results. The difference results obtained by the method of Hertz are between 1.47-2.37% for the maximum contact pressure and 2.45-3.02% for the major axis the ellipse. The difference results using finite element method also gives conforming results of 0.09-3.5% for the maximum contact pressure.
TINGKAT URGENSI PENGUJIAN POLUSI GAS BUANG KENDARAAN BERMOTOR DI INDONESIA Hardianto, Toto; Suwono, Aryadi; Suyitno, Suyitno
Mesin Vol 12, No 3 (1997)
Publisher : Mesin

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Abstract

Until now, Indonesia does not have any dynamics exhaust pollution test standard, which is customized to Indonesian traffic and climate. On the other hand, the air pollution problem in Indonesian big cities has reached a critical level.Some researches done by some institutions (including ITB) show that the air pollution level in Jakarta and some other big cities is mainly caused by transportation, industry, domestic, and trash burning. Among those four pollution sources, transportation (motorized vehicles) is the most significant. Therefore, in order to solve the air pollution problem effectively, it has to be started from the transportation sector, and It is very important to do an intensive research which leads to a establishment of a test standard for exhaust gas pollution that is designed based on Indonesian condition.The application of a suitable dynamics exhaust gas pollution test standard is expected to support the pollution monitoring and control activities all over Indonesia, especially in big cities, so that the Indonesian air pollution can be reduced and maintained in a save level.
PENERAPAN METODE KRITERIA OPTIMUM DAN FAKTOR SKALA PADA OPTIMASI STRUKTUR RANGKA PENERAPAN METODA KRITERIA OPTIMUM DAN DENGAN KENDALA PERPINDAHAN TUNGGAL Kuntjoro, Wahyu
Mesin Vol 14, No 3 (1999)
Publisher : Mesin

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Abstract

An optimization process could be performed through a priori specification of a set of conditions to be satisfed by the optimum design. By manipulating the optimality criteria, simple redesign equations can be derived. This research looks at mathematical criteria obtained from diferentiation of Lagrangian with respect to the design variabels. In deriving the optimality criterion and developing the algorithm, fill use is made of the knowledge of the behaviour of the constraint imposed on the structure. Scale factor is applied to a design which meets the optimality criteria. “A computer program has been developed and applied to a frame structure. The design output is compared to the optirnumgdesign produced by NASIRAN Sol-200 optimization package.

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