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Mesin
Published by Institut Teknologi Bandung
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Articles 539 Documents
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PENERAPAN KENDALI JARINGAN NEURAL PADA SISTEM GERAKAN LURUS PRESISI Ilham Budi Santoso; Zainal Abidin
Mesin Vol. 14 No. 3 (1999)
Publisher : Mesin

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Abstract

This paper presents an empirical result on the application of neural network controller in a precision straight motion system. As a controller, neural networks learn in two phase. In the first learning phase, neural network was doing inverse system identification. It is called general learning. In the second learning phase, neural network was applied as an adaptif controller which doing online learning. It is ca//ed special learning. Through these two learning phases, neural network shows a good performance for wide range operation with a minimum operator/human intervention.
KARAKTERISTIK PENGAYAK GETAR DENGAN SUMBER EKSITASI POROS EKSENTRIK M Bur; Nazaruddin Nazaruddin; A. I Mahyuddin; J Samudra
Mesin Vol. 15 No. 1 (2000)
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Abstract

Vibrating screen is an equipment used to seperate material according to its particle size. It is usually operated in combination with a crusher. A vibrating screen prototype has been developed. This prototype, called as "Pengayak Getar Semen Padang Prototipe"”0l" (PGSP PRO-01), employs an eccentric shafi' to excite the screen. The prototipe was designed to obtain several experimental parameters such as deck elevation, eccentric shaft rotational speed, screen capacity,types of material and screen mesh, gradation of material and spring stiffness. The characteristics of vibrating screen and material sieved may be determined experimentally. In this study, the performance of PGSP PRO-01 is examined by using silica sand, with a bulk density (ρ) of 1.54ton/m3, and material gradation of 50% of the grains larger than 5 mm, 35 % between 2.5 - 5 mm and 15% are less than 2.5 mm in size. Assuming a 92% screen efliciency and a 0.32 m2 screening area, theoretical screen capacity of 7.5 ton-per-hour (tph) is obtained. Experimentally, optimum screening parameters obtained are 7.2tph capacity at 91.7% efliciency resulting from a 900 rpm speed of eccentric shafi and a 10° deck elevation.
ANALISIS NUMERIK KONVEKSI ALAMI DALAM ANNULUS KONSENTRIK DEN GAN METODE ARTIFICIAL COMPRESSIBILITY Pranowo Pranowo
Mesin Vol. 15 No. 1 (2000)
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Abstract

This paper discusses numerical solution of natural convection in concentric annulus. Artificial Compressibility Method has been used to solve two dimensional Navier Stokes equations. And to strengthen the relationship between pressure and velocities, pressure was placed on the cell center, whereas the velocities and temperature were placed on cell vertex. Navier Stokes Equations were divided into discrete forms by finite volume method, so that flow conservation could be kept balance. The computation results show no significant difference with the other results solved using other computation method.
ANALISIS EKSPERIMENTAL GETARAN BANTALAN BOLA DENGAN MENGGUNAKAN FRF ORDE TINGGI Trihono Sewoyo; Komang Bagiasna; Zainal Abidin
Mesin Vol. 15 No. 1 (2000)
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Abstract

This work is based on method developed by Storer, Lee and Tomlinson [1,2,3]. Storer [1] determined parameter of nonlinear system by curve fitting of higher order FRF that was obtained by measuring stimulus and response of nonlinear system in the frequency domain. While Lee [2] determined spatial model parameter i.e. mass, stiffness and damping constant based on higher order FRF that was obtained from measurement of excitation force amplitude in time domain and complex response in frequency domain. In this paper the two methods will be compared by conducting experiment on the ball bearing which shows nonlinear behavior [4,5]. The result shows the two methods have a significant difference. While the amplitude of excitation force affect the higher order Transfer Function and also the dynamical parameter of the system.
SISTEM PRODUKSI TERDISTRIBUSI MANDIRI: PERANGKAT LUNAK INTI PENGEMBANGAN SISTEM PRODUKSI Yatna Yuwana Martawirya; Rochmad Setyadi
Mesin Vol. 15 No. 1 (2000)
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Abstract

The objective of the present research is to develop an application software called MSC (Manufacturing System Core) which is used as a core in the development of a manufacturing system software. The development of MSC is based on ADiMS (A utonomous Distributed Manufizcturing System). An object-oriented modeling method is adopted to represent the autonomous component of the manufacturing systems. The example of minimum application of MSC and the method of extent are discussed to understand the modularity of MSC. Software development technology applied at MSC are discussed to see the ability of MSC in the data sharing with other application.
PERHITUNGAN PERAMBATAN RETAK PADA LAP-JOINT DENGAN METODE FINITE ELEMENT ALTERNATING Dibyo Legowo; Husen Juarsa; Adirakhmantyo P. H; Utama H Padmadinata; Djoko Suharto
Mesin Vol. 15 No. 2 (2000)
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Abstract

Metode finite element alternating (FEAM) merupakan salah satu metode untuk menentukan faktor intensitas tegangan pada kasus retak berganda. Metode ini merupakan gabungan dari metode finite element dan solusi analitis untuk kasus retak pada pelat dengan lebar tak berhingga, Penelitian yang dilakukan merupakan penelitian lanjutan yang diterapkan untuk kasus khusus yaitu sambungan susun (lap-joint) yang merupakan salah satu sambungan penting pada struktur pesawat terbang. Untuk itu pada penelitian ini metode finite element alternating dikembangkan untuk geometri pelat berlubang. Penelitian yang dilakukan meliputi pemeriksaan program FEAM pada kasus pelat dengan satu lubang, pelat dengan beberapa lubang dan sambungan susun (lap-joint) untuk menghitung faktor intensitas tegangan (K). Hasil perhitungan K, ini kemudian digunakan untuk perhitungan perambutan retak pada sambungan susun tersebut.
Studi Eksperimental Hubungan Parameter Proses Pemesinan Wire EDM dengan Kekerasan Permukaan untuk Material AISI 1148 Sigit Yoewono Martowibowo; Satrio Pinandito
Mesin Vol. 15 No. 2 (2000)
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Abstract

Technology development advances in recent years produce materials having higher strength, complicated shape and high accuracy. These have placed demands on the new technology in machining processes. Non-conventional machining processes are providing effective solutions to the problem mentioned above.Wire EDM machining is one of some non-conventional machining processes which is using wire as tool. The limitation of this technique as also happened with other non-conventional machining processes is a lower rate of material removal comparing to the conventional processes.This study was conducted to obtain data in order to optimize machining condition of medium carbon steel using for die material.
METODA ULTRASONIK UNTUK MENENTUKAN ARAH KRISTAL TUNGGAL BERSTRUKTUR KUBIK Amoranto Trisnobudi; Benny Sugiharto
Mesin Vol. 15 No. 2 (2000)
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Abstract

Single crystal direction can be determined by x-ray diffraction. The determination of this crystal direction can also be carried out by using ultrasonic method. In this method the ultrasonic wave velocity propagating through the crystal is measured. From this velocity measurement then the crystal direction can be determined. This paper deals with the results of a research about the direction determination of cubic single crystal using ultrasonic wave. There are two methods used, namely graphical method and computer method. These two methods used the same data, i.e. velocity data for all possible direction that has been calculated based on the wave and elasticity theory. In the first method, the data are stored as several graphics whereas in the second method they are stored as database in a computer program. These two methods have shown the same results in aluminum for crystal directions [311], [331], [661], [631] and [611] where the computer method can be carried out quicker than the graphical method.
PENGARUH ARAH SERAT TERHADAP FAKTOR INTENSITAS TEGANGAN PADA UNIDIRECTIONAL LAMINA YANG MENGANDUNG CENTER CRACK IGN Wiratmaja Puja; Yedi R Supriyadi
Mesin Vol. 15 No. 2 (2000)
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Abstract

This paper presents the stress intensity factor (SIF) analysis for unidirectional fiber-matrix lamina containing center crack under uniaxial loading. Several variables are considered on the influence to the stress intensification factor i.e. fiber direction,θ, crack dimension parameter, 2a/L, fiber and matrix volume fraction, Vf, Vm, fiber and matrix stiffness ration, Ef/Em, and lamina thickness. The stress-strain equations for the lamina are derived using micromechanic approach. The governing equations are solved numerically using the finite element method with triangular type element. The element stifiness matrix is obtained using the polynomial shape functions. The software to calculate stress-strain in the lamina containing center crack is developed. Case studies jor numerical purposes consider the carbon-epoagz lamina with carbon type P-100. Numerical results for carbon epoxy lamina are presented in graphical form of SIF as a fimction of the fiber direction, fiber matrix stifihess ratio and volume ratio, and crack geometry.
MODEL HETEROGEN PENGERINGAN BUTIRAN JAGUNG DALAM UNGGUN DIAM Istadi Istadi; J. P Sitompul
Mesin Vol. 15 No. 3 (2000)
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Abstract

This paper deals with one-dimensional dynamic modelling and simulation of deep -bed com drying by two-phase model or heterogeneous model The models consider mass and heat transfer process within grain and drying air phase. This model also considers moisture content and temperature gradient within grain. The coupled of partial differential equations developed, then solves numerically by finite difference with altemating direction implicit method algorithm. The dynamic models predict not only humidity and temperature of outlet drying air, but also grain moisture content and temperature. The simulated profiles are compared with expenmental data, taken from available literature. The models can describe corn grain drying process in deep -bed dryer. However, the model parameters should be modified to get drying characteristic profiles that closed to the experimenal data.

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