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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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STUDI PERBANDINGAN METODE MODAL TESTING KLASIK DAN MODAL TESTING KOMPLEKS DENGAN METODE ANALITIK DALAM IDENTIFIKASI ARAH WHIRLING ORBIT SISTEM ROTOR. Budiwantoro, Bagus; H, Zulhendri
Mesin Vol 16, No 2 (2001)
Publisher : Mesin

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Abstract

The classical modal testing theory has been widely and successfully used for modal parameter identification of structures of all kinds, except rotating machinery. In this paper a new modal testing theory is explained to separate the rotor vibration into positive and negative frequenc regions. The dynamic characteristics of nonrotating structures in negative frequency region have no meanings, but the dynamic characteristics of rotor systems in negative frequency region havesignificant physical meanings. Since all dynamic characteristics of rotor systems are closely related with rotor rotations, the directivity of modes is very important in rotor dynamics. The frequency response function are obtained by the new modal testing method using complex notation can be used to identify the directivity of modes such as forward and backward. Applications of the classical and complex modal testing method are compared with the analytical method to identify the whirl directions of single/multi rotor systems.
PERAN DAN PERKEMBANGAN PROFESI JASA ENGINEERING TEKNIK MESIN Taufik, Iman
Mesin Vol 2, No 2&3 (1983)
Publisher : Mesin

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Abstract

Dalam makalah ini, kami ingin menjelaskan secara singkat bagaimana peran profesi jasa engineering teknik mesin dalam pengingkatan kemmapuan manajemen dan teknologi nasional dalam pelaksanaan proyek-proyek pembangunan di sektor tersebut di atas teruatama proyek-proyek berteknologi menengah dan tinggi dan bagaimana perkembangannya di Indonesia sejak tahun 1968.
DESAIN GEOMETRI SCREW PRESS DENGAN METODE NUMERIK ELEMEN HINGGA Budiwantoro, Bagus; Hermawan, Arief Teguh
Mesin Vol 17, No 2 (2002)
Publisher : Mesin

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Abstract

Screw Press is one of the main component of Crude Palm Oil (CPO) extraction machine. Until these days, the Indonesian CPO industries still import this component from Malaysia with longer delivery-order period that means a problem for productivity. This paper was written as alternative solution for Screw Press geometrical design by doing some engineering analysis. The analysis was limited to the geometrical design matter of component by modifying the fillet part and thickness of screw, and also analyzing the surface pressure of component. Finite element model was developed using MSC.Nastran software package. The results of overall analysis show that the reduction rate of stress concentration as the effect of increasing fillet radius is 12% per 5 mm and the reduction rate of maximum stress as effect of increasing screw thickness is 9% per 2 mm. Surface pressure caused by loading is linear with fillet radius and its value is about 0,1 times of the mean principal stresses.
ANALISA TEGANGAN EKSPERIMENTAL DENGAN METODA FOTOELASTISITAS Mahyuddin, Andi Isra; Boestaman, Refrizal; Suharto, Djoko
Mesin Vol 3, No 4 (1984)
Publisher : Mesin

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Abstract

Analisa tegangan dengan metode fotoelastisitas tembus cahaya dua diemsi adalah salah satu metoda optik yang digunakan dalam yang akan diuji dibuat modelnya dari bahan polimer tembus cahata. Model kemudian diletakkan pada perangkan pengujian dan dibebani serupa dengan pembebanan prototip. Hasil pengujian berupa pola garis isokromatik yang merupakan tempat kedudukan titik dengan selisih tegangan utama yang sama, dan pola garis isoklinik yang merupakan tempat kedudukan titik dengan arah tegangan utama yang sama. Data orde isokromatik dan parameter isoklinik digunakan untuk menentukan distribusi tegangan.
KONTROL AKTIF KEKAKUAN DAN MASSA STRUKTUR DENGAN MENGGUNAKAN JARINGAN SARAF TIRUAN Setio, Sangriyadi; Setio, Herlien D; Arismunandar, Wiranto
Mesin Vol 18, No 1 (2003)
Publisher : Mesin

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Abstract

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.
LONJAKAN THERMAL RUANG BAKAR S, Pawito
Mesin Vol 4, No 3&4 (1985)
Publisher : Mesin

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Abstract

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A PLAUSIBLE ENERGY YIELD FROM PALM OIL MILL EFFLUENT Cundr, Ing. Ondřej
Mesin Vol 19, No 2 (2004)
Publisher : Mesin

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Abstract

Application of biogas generated from palm oil mill effluent for producing electricity has been proven as an ecological alternative to naphtha and fossil fuels. In the first part of this article, the process of making oil from fresh fruit bunches is briefly described together with amounts of waste gained. After that, different types of treatment of palm oil mill effluent (POME) as one of results of the process are examined, resulting in a suggestion of anaerobic digestion under thermophilic conditions as the best way to treat POME. Finally, attention is also paid to the emission reduction during an anaerobic digestion in close tanks. The aim of the article is to stress the overwhelming energy potential of POME that can bring high increase in electrification ratio and recognizable decrease of air pollution on the island of Sumatra.
PENGARUH MATRIKS INERSIA ELEMEN BALOK LENTUR DENGAN POTONGAN TAK SERAGAM Harsokoesoemo, Darmawan
Mesin Vol 8, No 1&2 (1989)
Publisher : Mesin

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Abstract

Makalah ini menyajikan penyusunan matriks inersia elemen balok lentur dengan potongan tak seragam, yang merupakan salah satu langkah paling awal dalan pemecahan numerik dengan metode elemen hingga untuk menghitung frekuensi alami balok lentur.Disajikan pula perbandingan hasil perhitungan frekuensi alami batang kantilever dengan potongan tak seragam dengan frekuensi alami batang kantilaver yang dianggap terdiri dari beberapa elemen yang masing-masing dianggap terdiri dari potongan seragam.
OPTIMASI NUMERIK STRUKTUR GONG UNTUK MEMPEROLEH RASIO FREKUENSI PRIBADI TERTENTU Suweca, I Wayan; Cahyono, Eko
Mesin Vol 21, No 2 (2006)
Publisher : Mesin

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Abstract

The sound quality of a gong is influenced by its dynamic characteristics (its structural eigenmode). By controlling natural frequency ratio of the gong to a certain value, we can expect to obtain the optimum gong design. The subject of the present research is to establish an analysis of the application of design optimization in obtaining an optimum gong design. The optimum gong is defined as a gong that has a certain natural frequency ratio. The natural frequency ratio adopted in this reseach is based on those of English bell [1]. The Sequential Unconstrained Minimization Techniques from Ansys 5.4 is used to perform the optimization process. The design optimization method has been successfully applied on the optimization of the gong. The results obtained from the three case studies show that the most sensitive part of the gong is at its around free end. This indicates that in manufacturing gong, this part must be carefully treated.
PERBANDINGAN PERSAMAAN KOEFISIEN PERPINDAHAN KALOR KESELURUHAN UNTUK PERANCANGAN PENUKAR KALOR Indartono, Yuli Setyo; Pasek, Ari Darmawan
Mesin Vol 11, No 2 (1996)
Publisher : Mesin

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Abstract

This paper concerns with comparison of various heat transfer equations which can be used in the design of a shell and tube heat exchanger for combustion gas and air. A computer programme which also includes the thermodynamics properties of the gas and air was made for that purpose. Characteristics of the heat exchangers are then compared with the existing industrial heatexchanger. It was found that the overall heat transfer coefficient equation proposed by Babcock & Wilcock gives the best results .

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