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Bagus Budiwantoro
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KONTRIBUSI PENELITIAN BEBERAPA ASPEK SISTEM PERPIPAAN PADA PROSES PERANCANGAN Darmawan Harsokoesoemo; I Wayan Suweca; Bagus Budiwantoro
Mesin Vol. 10 No. 1&2 (1994)
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Makalah ini mengetengahkan dua program dasar proyek penelilian berjudul "Penelitian Beberapa Aspek Sistem Perpipaan dan Penyusunan Konsep Kode Perancangan, Pembuatan, Perakitan dan Pengujian Sistem Perpipaan Indonesia", yaitu : (1) penyusunan konsep kode perancangan sistem perpipaan industri dan (2) penelitian tentang distribusi regangan pada percabangan pipa dan pipa belokan serta penelitian tentang fleksibilitas sistem perpipaan.Hasil proyek penelitian ini, yaitu (1) konsep kode perancangan, (2) algoritma analisis fleksibilitas sistem perpipaan dan (3) diagram distribusi tegangan umuk berbagai percabangan pipa dan pipa belokan, akan memberikan kontribusi dalam meningkatkan kemampuan rekayasa dan perancangan sistem perpipaan dalam bidang industri proses dan industri perminyakan, yang merupakan industri penting bagi ekonomi negara.
OPTIMASI PELAPISAN MATERIAL VISKOELASTIK I Wayan Suweca; Bagus Budiwantoro; Gatot Santoso; Djoeli Satrijo
Mesin Vol. 11 No. 1 (1996)
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Dalam tulisan ini dibahas suatu penerapan dari metode optimasi untuk mendapatkan redaman struktur melalui pelapisan material viskoelastik secara optimal. Algoritme optimasi yang digunakan didasarkan pada metode kriteria optimalitas (optimality criteria) dari Kuhn-Tucker, di mana berat total struktur di ambil sebagai fungsi objektif dengan kendala dinamik berupa redaman struktur. Model redaman yang digunakan adalah redaman jenis histeritik. Gradien fungsi kendala terhadap disain variabel dihitung dengan menggunakan perhitungan sensitivitasdengan variabel kompleks. Sebagai contoh numerik diberikan satu kasus optimasi pelapisan material viskoelastik pada suatu beam Euler-Bernoulli.
ANALISIS DAERAH BINTIK MANIS PADA PERANCANGAN RAKET BULUTANGKIS Bagus Budiwantoro; I Wayan Suweca; Roby C. M Sibuea
Mesin Vol. 13 No. 2 (1998)
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One method to increase badminton racket performance is by improving individual player's racket. For this purpose, two measurements are necessary, i.e. (1) the racket 's location of sweet spot that is inherent due to its manufacturing process and (2) the players "sweet spot", i.e. the spot that the player consistently hit the badminton cock, which for factory manufactured racket is not the racket 's inherent sweet spot. If the two spots do not coincide, than the original racket meet spot can be shi/ted until it coincides with the player sweet spot, making the racket performance to be maximised.
PERANCANGAN ALAT PENCAMPUR PASIR CETAK “TURBO MIXER” Bagus Budiwantoro; Bayu Pratama Adikara
Mesin Vol. 13 No. 3 (1998)
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Turbo Mixer with 350 kg capacity is designed to mix greensand by mixing it using turbo blade rotation so it creates a mix using scatter method. Using this method, the greensand will not be damaged during the process. The turbo blade rotation with lateral mixing arm was set in a way that the mixer could work efficiently. The construction of this turbo mixer is rigid but simple to ensure the easiness of operating, maintenance and manufacturing. In other application, Turbo Mixer could be developed for mixing of fertilizers, drugs etc. Several design practice figures for 350 kg turbo mixer, are taken from the recalculation of 750 kg turbo mixer that have been made before.
STUDI PERBANDINGAN METODE MODAL TESTING KLASIK DAN MODAL TESTING KOMPLEKS DENGAN METODE ANALITIK DALAM IDENTIFIKASI ARAH WHIRLING ORBIT SISTEM ROTOR. Bagus Budiwantoro; Zulhendri H
Mesin Vol. 16 No. 2 (2001)
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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.
KAJI NUMERIK PENGARUH CACAT RETAK MELINTANG PADA POROS TERHADAP PERILAKU DINAMIK SISTEM POROS ROTOR Bagus Budiwantoro; Ojo Kurdi; Kurnia Nugraha
Mesin Vol. 16 No. 3 (2001)
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The stiffness of a cracked shaft changes due to the position of the crack. The problem is how to make a general equation of motion that can be used for all crack positions, so frequency response resulted represents the real frequency response of the cracked shaft. The cracked shaft modelling uses the moment inertia of cracked shaft at various crack positions is the first step. The second step is determining frequency response of significant crack position. The third step is determining the equivalent moment inertia of a cracked shaft that represents the condition of the crack. Next, by using Rayleight-Ritz Method and equivalent moment inertia of cracked shaft, the equation of motion that represents condition of cracked shaft can be determined. The results of this equation are Campbell Diagram and response to force excitation due to mass unbalance and asynchronous force. Dynamic behaviors of system are presented for three positions of crack, namely 0o, 90o, and average position. 0o position is the significant position, 90o position gives the smallest change to dynamic behavior of cracked shaft and the average position represents the condition of the cracked shaft.
DESAIN GEOMETRI SCREW PRESS DENGAN METODE NUMERIK ELEMEN HINGGA Bagus Budiwantoro; Arief Teguh Hermawan
Mesin Vol. 17 No. 2 (2002)
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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.
APLIKASI METODE RAIMONDI DAN BOYD PADA PERBANDINGAN ANALISIS PERFORMANSI JOURNAL BEARING LOKOMOTIF YANG MENGALAMI BEBAN IMPAK Bagus Budiwantoro; Ridha Firmansyah; IGN Wiratmaja Puja
Mesin Vol. 21 No. 2 (2006)
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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 .
Study Correlation Wear Rate Measurement Technique of Flared Chisel Bucket Teeth Using 3D Scan Imaging and ASTM G105 Bagus Budiwantoro; Kurniawan Kurniawan; R. Suratman; S.S Brodjonegoro
Mesin Vol. 26 No. 2 (2017)
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Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2017.26.2.3

Abstract

The aim of this study is searching a new method to provide wear rate measurement which simple and have better accuracy that occur in worn mining component surface addressed like flare chisel bucket teeth. Having correlation between Wet Sand Abrasion Test ASTM G105 and 3D scan modeling of worn surface, the validation of a new method to provide wear rate measurement using 3D scan technology would be elaborated. The preliminary study to provide wear rate measurement using 3D scan imaging have been established. The study related volume comparison by which 3d scan imaging process generated and buoyancy. Specimens were abraded using Wet Sand Abrasion Test ASTM G105 to provide specimen in certain percentage of volume loss. Several specimens consist of different percentage of volume loss were prepared. Specimens measured its volume over buoyancy and 3D scan imaging in two grade of meshing which are normal and smooth. Both of volume generated from 3D scan imaging compared to buoyancy volume measurement.  Study focused on dissimilarity among volume data generated. Analysis are carried out through the center and variability both 3D scan volume compared to buoyancy volume. The study shows that normal meshing has less dissimilarity level compare to smooth meshing. Both dissimilarity level span at -0.01% and -0.027% respectively. Higher mesh level tends to inaccurate volume measurement. Further study to determine suitable mesh level should be conduct in near future.
Co-Authors Adikara, Bayu Pratama Arief Teguh Hermawan Darmawan Harsokoesoemo Djoeli Satrijo I Wayan Suweca IGN Wiratmaja Puja Ir. Gatot Santoso Kurnia Nugraha Kurniawan, Kurniawan Ojo Kurdi R. Suratman Rachmad Indrakusuma Ridha Firmansyah Roby C. M Sibuea S.S Brodjonegoro Satrio Wicaksono Zulhendri H