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All Journal Journal of Mathematical and Fundamental Sciences Mesin
Komang Bagiasna
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Astronomy Chemistry Earth & Planetary Sciences Mathematics Mechanical Engineering Physics

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PENERAPAN ANALISIS MODUS GETAR EKSPEFNMENTAL UNTUK IDENTIFIKASI PARAMETER MODUS GETAR STRUKTUR MEKANIK Komang Bagiasna
Mesin Vol. 9 No. 1&2 (1990)
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Abstract

Dalam analisis modus getar eksperimental peranan aspek pengukuran Fungsi Respon Frekuensi adalah penting karena hasilnya digunakan sabagai acuan dalam menguji keabsahan model teoritik (misal: model elemen hingga) analisis dinamik suatu struktur mekanik. Keluaran yang diperoleh dari analisis di atas adalah berupa parameter modus getar yakni: frekuensi pribadi, perbandingan redaman dan bentuk modus getar dari struktur mekanik tersebut. Besaran tersebut diperoleh melalui proses curve fitting. Dalam pengkajian ini dilakukan analisis modus getar eksperimental atas suatu struktur mekanik dan pengernbangan proses curve-fitting data eksperimental dalam domain waktu.
SEMI OTOMASI MESIN PENYEIMBANG Zainal Abidin; Komang Bagiasna; Sigit Purwowinarwan; Ishak S Iskandar
Mesin Vol. 11 No. 2 (1996)
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Abstract

This paper presents research on the development of semi automation technique for balancing machines. Using this technique, rotational speed of rotors, data acquisition process, and amplitude and phase of vibration calculations could be performed by a computer. Consequently, faster and more accurate balancing process can be achieved. The effectiveness of the proposed control method was verified using experimental results. In this test, the rotor speed was measured by and compared to the results obtained from software, a digital oscilloscope, a digital tachometer and a Multi Channel Spectrum Analyzer M/ISA). Furthermore, to verify the accuracy of amplitude and phase calculations, the values obtained from the developed software were compared to those from analytical results obtained from MSA.
PENGEMBANGAN METODE PENYEIMBANGAN LANGSUNG TANPA MENGGUNAKAN MASSA COBA Ishak S Iskandar; Zainal Abidin; Komang Bagiasna
Mesin Vol. 11 No. 2 (1996)
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Abstract

This paper deals with the development of direct balancing method that uses no trial mass. This activity is the continuation work of the previous research on semi automation of balancing machine that has been performed at the Dynamics Laboratory IUC-ES ITB. This method has been developed by using Frequency Response Function (FRF) data of a balancing machine as a function of frequency and rotors masses that will be balanced. These FRF data are used as aconversion factor of voltage, which is the output of velocity transducer, to unbalance flzrce. Using this method, the balancing process can be perfiarmed faster and more accurately than that of conventional balancing methods.
ANALISIS TEORITIK DAN KAJI EKSPERIMENTAL UNTUK MENENTUKAN KEKAKUAN STATIK DARI BANTALAN ROL Ishak S Iskandar; Komang Bagiasna; Zainal Abidin
Mesin Vol. 12 No. 2 (1997)
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This paper describes theoretical and experimental study of the static bearing stiffness. This research is motivated by the role of bearing stiffness in determining the natural frequency of a rotor-shaft system. Previous investigators, White and Harris, have developed an analytical tool to calculate the bearing stiffness. However, this analytical results were not supported by experimental data. In this work, an experimental study was done in order to determine the static bearing stiffness. These experimental results are then compared to those obtained by White and Harris analysis. The analysis and experimental study will pave the way toward the determination of the dynamic bearing stiffness.
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.
ANALISIS KELURUSAN GERAK DAN PEMOSISIAN MEJA MACHINING CENTER MILLAC 4H Komang Bagiasna; Darto Darto
Mesin Vol. 17 No. 3 (2002)
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Abstract

Accuracy measurements were carried out on a table movement of four axis machining center using laser interferometer based integrated measuring system. In this case the measurements included table positioning accuracy in x-axis direction and table angular as well as table straightness displacement accuracy. Following the obtained results, analysis of the machining center table displacement was carried out by modeling the table accuracy movement using a homogenous transformation matrix (HTM) method. Guide ways deflection was analyzed using five contact point method and other analysis performed by taking into account misalignment between ball screw & slideways. Diagnosis was conducted by comparing the theoretical table accuracy displacement curve and the one obtained from laser interferometer based measurement, for determining the slideways wear contour and the progressive wear of the ball screw.
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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Abstract

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.
KAJI KOMPUTASIONAL PENGARUH BEBAN DAN KEAUSAN TERHADAP KEKAKUAN BANTALAN ROL Carolus Bintoro; Komang Bagiasna; Djoko Suharto; Zainal Abidin
Mesin Vol. 19 No. 2 (2004)
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Abstract

This paper explores the study of numerical determination of roller bearing stiffness as a result of wear increment by using contact Hertzian method. This study is part of the research on the determination of roller bearing vibration response as a result of wear increment. In this paper, wear is assumed as diametral clearance, Cd, and force work in radial direction. Computational method shows that increasing wear causes the decrease of stiffness. The relationship between deflection and stiffness, radial load and stiffness as a function of Cd can be determined.
MEASURING AND COMPENSATING FOR OFF-LINE TO RUNNING MACHINERY MOVEMENT Phan Anh Tuan; Zainal Abidin; Komang Bagiasna
Mesin Vol. 20 No. 2 (2005)
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Abstract

Actually, all rotating equipments which connected one to each other undergo a change in position during start-up (off-line) and this condition will affect the alignment of the shafts while running. The off-line to running movement characteristics of the vast majority of rotating machinery in industries have never been measured. It is very important to know how much movement occurred before concluding that it is insignificant and can be ignored. This paper will show the characteristics of both cold and hot misalignment. The purpose of this work is to analyze the influence of temperature to misalignment of rotating equipments that has been mentioned in some references but never been investigated. The objective of this work is to find out the characteristics of hot misalignment and to compensate for Off-Line to Running (OL2R) machinery movement. The results of the experiments and analysis show that the misalignment condition changes during operation and it strongly influences on the vibration level of the rotating machinery. In this case, the smaller the misalignment value, the smaller vibration level of the rotating machinery.
ANALISIS BESAR KESALAHAN MAGNITUDE FUNGSI RESPON FREKUENSI HASIL PENGUJIAN DENGAN METODE EKSITASI KEJUT AKIBAT KETERBATASAN PANJANG WAKTU REKAM Agusmian Partogi; Zainal Abidin; Komang Bagiasna
Mesin Vol. 21 No. 1 (2006)
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Abstract

This paper describes the mathematical analysis concerning the influence of time record length on the magnitude error of the Frequency Response Function (FRF) using impact hammer testing. In this paper, the value of damped natural frequency is assumed to be the same with the value of positive integer multiple of the frequency resolution in response spectrum. The mathematical analysis results an equation which can be used to calculate the error value of FRF magnitude due to the finite time record length. As an illustrative example, the simulated FRF using impact hammer testing on four S-DOF vibration system models is presented in this paper. The simulation is performed using a computer program which is constructed using MATLAB software. The simulation results show that the error of FRF magnitude obtained from the simulated testing is almost the same with the error value derived from theoritical equation.
Co-Authors Agus Hidayat Agusmian Partogi Bintoro, Carolus Darto Darto Djoko Suharto Harsono Wiryosumarto Hendra lndra Wirawan Ishak S Iskandar K Magiano Phan Anh Tuan R Monhendri Sigit Purwowinarwan Trihono Sewoyo Wayan Noviyantha Zainal Abidin