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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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PENGEMBANGAN PERANGKAT AKUISISI DATA PORTABEL BERBASIS MIKROKONTROLER AT89C52 UNTUK PENYEIMBANGAN DI LAPANGAN Zainal Abidin; Arief Indrabayu; Adi Santoso; Hariyadi Hariyadi
Mesin Vol. 17 No. 3 (2002)
Publisher : Mesin

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Abstract

This paper describes the development of a portable microcontroller-based data acquisition system suitable for field balancing. The prototype was designed to have three channels. Channel 0 was designed to receive a DC signal and therefore suitable for reference signal, such as generated by optical sensor. In contrast, channels 1 and 2 were designed to receive AC signals and therefore suitable for vibration signals. In the design, the acquisition process was performed by three ADCs which sample data simultaneously, thus minimizing the phase difference between channels. The data obtained by ADC are then stored within memory, capable to store data as many as 8192 for each channel. The hardware is also equipped with a keypad modul as an input medium, an LCD modul as an output medium, and a rechargeable battery as a power supply. The software of this data acquitition system is classified into data-acquitition program and interface program. The performance of the prototype was tested using unbalance demontration setup and the results of measurement are compared to those obtained by MSA HP 35650 as a reference instrument. The measurement shows that results of measurement obtained by theprototype are relatively similar to those obtained by MSA.
PENGARUH PERUBAHAN TEMPERATUR AIR PENDINGIN TERHADAP SAAT PENYALAAN PADA MOTOR BENSIN Tri Yuswidjajanto Zaenuri; Arief Hariyanto; Harki Apri Yanto
Mesin Vol. 18 No. 1 (2003)
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Abstract

This paper contains the testing of a spark ignition engine to observe the influence of the engine temperature variation on the ignition timing. The engine temperature of Toyota 7K equipped with EFI self developed by LMBSP is varied and the performance test is conducted over the variations of load and rpm, which simulate the real condition on the road. The aim of the experiments is to yield the ignition timing which produces the optimum performance at any load condition.
PEMILIHAN TIPE MOTOR BAGI PESAWAT ANGKUT SIPIL DAN PESAWAT MILITER Djakaria Wiradisuria
Mesin Vol. 18 No. 1 (2003)
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Abstract

Since the begining of the first world war, the development and production of aircraft, especiallythe aircraft engine is booming, due to the urgent need of several leading countries to compete and gain superiority in the air for its survival and also to achieve hegemony politically as well as in the field of economy.World aircraft and engine producer were all involved in this competition, supported by its national - research - industrial and technological as well as high education centers. Many engine types, with various technological - level and specification is now available in the world market. For the customer it is a necessity to evaluate and select out of all those products the best choice to complete the airfleet which suits to the need from operational - economical - and logistic point of view.
PENERAPAN METODE ENVELOPING UNTUK MENDETEKSI CACAT LOKAL BANTALAN GELINDING Zainal Abidin; Komang Bagiasna; Wayan Noviyantha
Mesin Vol. 18 No. 1 (2003)
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This paper describes the study and implementation of enveloping method to detect a local bearing defect. First, it discusses the limitation of the conventional methode in bearing defect detention which is widely used in industry nowadays. The steps required to implement enveloping method are then studied and parameters influencing the success of detection process is identified. To demonstrate the effectiveness of the enveloping method, an experiment is performed to detect defect of a bearing with a simulated inner-race defect. The results of this study show that the enveloping method capable of detecting inner-race defect on a bearing in the situation where the conventional method fail to detect it.
KONTROL AKTIF KEKAKUAN DAN MASSA STRUKTUR DENGAN MENGGUNAKAN JARINGAN SARAF TIRUAN Sangriyadi Setio; Herlien D Setio; Wiranto Arismunandar
Mesin Vol. 18 No. 1 (2003)
Publisher : Mesin

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This paper presents a theoretical and experimental study on active control structure excited by seismic loads using artificial neural network Artificial neural network is used to calculate the control force based on acceleration of the structure which is obtained by accelerometer measurement. The control mechanism is implemented on the structure using active stiflness and mass based on continuous vibration measurement. The reability of the active control system with artificial neural network has been tested experimentally using a reduced model of two=storey steel flame excited by base acceleration through a small shaking table. The experimental study shows that the artificial neural network control method gives satisfactory results for many types of base excitation such as random and El-Centro N-S earthquake accelerations. The neuro control algorithm is simple and reduces consideranbly computational time.
KAJI EKSPERIMENTAL MOTOR BAKAR BENSIN 2 LANGKAH DENGAN SISTEM PENYEMPROTAN LANGSUNG BAHAN BAKAR MEKANIS PADA RUANG BAKAR Iman Kartolaksono Reksowardojo; Aan Setyawan; Budi Sudarwanto; Ibrahim Syaharuddin
Mesin Vol. 18 No. 1 (2003)
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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.
PENERAPAN MODEL UP WIND, EKSPONENSIAL, DAN CENTRAL DIFFERENCE PADA METODA ANALISA SUB BULUH Nathanael P Tandian; Aryadi Suwono; Winarto Winarto
Mesin Vol. 18 No. 2 (2003)
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Sub-channel analysis is a method for analyzing thermal hydraulic aspects of nuclear reactors or heat exchangers. The analysis calculates distributions of fluid temperature, pressure, axial velocity, transverse velocity, and fuel rod temperature or heat flux. This paper deals with efforts for improving the accuracy of the sub-channel method. Three numerical schemes for evaluating transversal advective heat rates, i.e.: up wind, exponential, and central difference schemes, were compared. The differences among calculation results obtained by programs that apply these schemes were insignificant. The paper also seeks the best definition of averaged temperature for evaluating physical properties of control volume. It was found that accuracy of the sub-channel method can be improved if the volume-averaged and area-averaged enthalpy in the energy equation, and the volume-averaged density in the axial momentum equation were evaluated based on the fluid temperatures at the middle of control volumes.
PENGARUH ETANA PADA REFRIGERAN HIDROKARBON Zainal Abidin; Ari Darmawan Pasek; Abdurrachim Abdurrachim
Mesin Vol. 18 No. 2 (2003)
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Abstract

Hydrocarbon refrigerant is one kind of refrigerants, which is developed to substitute CFC and HCFC. The substances contained in hydrocarbon refrigerant are etane, propane, normal butane, and iso butane. Ethane is being suspected on reducing the performance of refrigerator. This paper deals with theoretical study of ethane influence in hydrocarbon refrigerant. First of all it is necessary to create software for evaluating thermodynamics properties. This software has many choices for prescribed thermodynamics properties. According to the analysis, it is known that the more ethane content in HCR-12, the more deviation of saturated pressure-temperature curves between HCR-12 and R-12. While in HCR-22 when the pressure is less that 4 bar, it is known that the more ethane content, the more deviation of saturated pressure-temperature curve between HCR-22 and R-22. However, if the pressure is above 4 bars, it is known that the more ethane, the saturated pressure-temperature curve is close to the one of HCR-22 with 4% ethane content. On performance test of standard refrigeration system using the refrigerant, it is known that the more ethane content in HCR-12 and HCR-22, COP of the system decreases gradually. The average temperature in evaporator and condensor also declines.
PEMODELAN DAN PERANCANGAN GAS COOLER UNTUK MESIN REFRIGERASI CO2 Willy Adriansyah
Mesin Vol. 18 No. 2 (2003)
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Abstract

Gas cooler is one of the important components in CO2 refrigeration system and it must be designed properly. Conventional mathematical modeling used in designing heat exchanger have some drawbacks when the working fluid has large variation on its thermo physical properties. This paper discusses detail modeling and designing one of heat exchanger types which takes into account unique characteristic of CO2 as refrigerant. The mathematical model is then validated by experimental data. The comparison shows that the model predicts gas cooler performance within 2% maximum deviation. The principles of modeling can be applied to various types of heat exchanger.
ANALISIS TEGANGAN THERMAL PADA TROMOL REM TRUK DENGAN KAPASITAS ANGKUT 6 TON IGN Wiratmaja Puja; Henry Ako Tampubolon; Untung Suhartanto
Mesin Vol. 18 No. 2 (2003)
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Abstract

This paper presents drum brakes thermal stress analysis for 6 ton truck capacity, due to friction between shoe and drum for two leading shoe brakes type. The mechanical and thermal loading are analyzed for various road conditions such as straight path, curved, and downhill path, with various value of deceleration. Based on the transient heat transfer, the drum temperature distribution are calculated for various deceleration and braking time period. Using finite element techniques, the thermal stressses are obtained and the results are compared to the actual failures evidences of brake drums. It is obeserved that the real heat crack locations are in agreement with the computed stressed areas. Based on the pressure and temperature distribution, the wear rate can be obtained to estimate the technical life of the brake drum.

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