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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
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Articles 5 Documents
 1 
Search results for , issue " Vol 24, No 2 (2009)" : 5 Documents clear
EVALUASI POLA FUNGSI RESPON FREKUENSI PADA RESPON GETARAN BANTALAN GELINDING Monhendri, R; Bagiasna, Komang
Mesin Vol 24, No 2 (2009)
Publisher : Mesin

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Abstract

Rolling bearing is a mechanical component which is commonly used in industrial machinery to suppress mechanical losses due to friction. Health condition of those machines are monitored by measuring its vibration responses as normally conducted in predictive maintenance (PdM) technology. There are two important steps in PdM, i.e. frequency spectrum analysis for diagnostic purpose and control trip value which is based on the root mean square (RMS) vibration level evaluation of the machine in operation. The vibration response measuring results show, the floor noise level contributs to the increase in RMS vibration level. Floor noise found in the frequency spectrum of the rolling bearings vibration resembles the pattern obtained from the frequency response function (FRF) measurements of the rolling bearing assembly unit. The objective of this study is to evaluate the FRF patterns detected in the vibration response of a new rolling bearing installed in the measuring set up. The vibration response and FRF measurements were performed and the frequency spectrum is measured for various shaft rotating speeds as well as static loads. Floor noise signal obtained from frequency spectrums measurement shows a pattern which resembles the FRF curve of the roller bearing measuring set up. The FRF pattern of the floor noise is caused by rolling friction phenomena which generates random vibration excitation signals on the tested rolling bearing and its supporting structure.
DEVELOPMENT OF AUTO-GENERATING AERODYNAMIC LOADS FOR WING-BOX FINITE ELEMENT MODEL BASED ON SCHRENK METHOD Zain, R; Pamungkas, I. R; Wafiqni, Wafiqni; Yusni, A
Mesin Vol 24, No 2 (2009)
Publisher : Mesin

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Abstract

This paper describes the development of computer application for computing the wing lift distribution and auto-locating each sectional lift force to the appropriate nodes of wing-box finite element model (FEM). In Catia-V5 environment, Visual Basic .Net is intensively utilized to access several Catia’s Component Object Models (COMs) by implementing several user interfaces for collecting flight data from user and for linking to the wing-box finite element model that already created in the previous work. The distribution of lift force is governed by Schrenk method, where the distribution is multiplied by limit load factor and safety factors in order to conform to the airworthiness requirement. The lift force is computed for each rib-space area and located on a point of quarter chord called a Handler. Correspondingly each upper wing surface of rib-space called Agent conducts as media to transform each lift force from a handler into their associated nodes of FEM. To demonstrate this work, a hypothetical N250 wing box structures is utilized for a case study. The result of this work is very useful to be utilized for wing design involving aerodynamic and structure analysis.
PENGEMBANGAN ALGORITMA PEMBANGKITAN G-CODE MESIN PERKAKAS CNC OKUMA&HOWA BERFASILITAS AUTOMATIC TOOL CHANGER DAN INDEXING PADA SOFTWARE CaSTPro Martawirya, Y. Y; Arthaya, B; Sunil, A. W
Mesin Vol 24, No 2 (2009)
Publisher : Mesin

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Abstract

This research deals with the integration product design phase, the process planning phase, and manufacturing operation planning phase through the feature-based product modeling. The competition in manufacturing industries demands a short production lead time. Autonomous Distributed Manufacturing Systems which has autonomic production elements enable to integrate those three phases through its autonomic product model. One of the proposed methodologies is a feature-based product modeling. At feature base product modeling, a product was defined as a model that is an interaction among features. Product model enable to identify the decreasing or additional volume influence to its geometry. At the final stage of product design, a model product enables to identify all features it’s has, features interaction, and features manufacturing sequences. At this research, G-Code was generated by product model that was designed by using CaSTPro software. The developed product model enriched its functionality with new facility that was a G-Code generation. As an example, G-Code fit for a horizontal machining center Okuma&Howa MILAC 4H FANUC 6M which was equipped with a tool changer and indexing had been developed.
DEVELOPMENT OF COAXIAL ROTOR MICRO UNMANNED AERIAL VEHICLE Thien, H. P; Mulyanto, T; Muhammad, H; Suzuki, S
Mesin Vol 24, No 2 (2009)
Publisher : Mesin

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Abstract

Micro Unmanned Helicopter with ability of takeoff, landing and hovering offeres excellent support tool for missions in indoor environment. In this paper, a review of preliminary studies towards the development of autonomous coaxial helicopter MAV is presented. The paper starts with the statement of coaxial helicoper MAV development. Then, it is continued by the introduction of development of dynamic model for a typical coaxial rotor platform. In the third issues, initial steps in development of sensory system and control system will be dealt with. In brief, an analytical mathematical model has successful derived. This model together with the developed sensor system will act important role towards the full development of the dynamics model as the system identification is carried out.
PEMODELAN DAN SIMULASI SISTEM PEMBANGKIT TURBIN GAS PLTGU TANJUNG PRIOK Indrawanto, Indrawanto; Cahyono, H
Mesin Vol 24, No 2 (2009)
Publisher : Mesin

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Abstract

This paper presents the modeling and simulation of the gas turbine generating system of Tanjung Priok Combined Cycle Power Plant. The gas turbine model is approximated using steam turbine systems. The model developed only accepts load changes as input to the system. Three types of control systems; speed-droop governor, speed-droop governor with integral control, and speed-droop governor with integral and derivative control have been tried to control the frequency of the system. The simulation results show that, in the presence of load changes, the speed-droop governor with integral and derivative control is able to bring back the system frequency to 50 Hz without oscillation.

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