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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.
PENERAPAN METODE ENVELOPING UNTUK MENDETEKSI CACAT LOKAL BANTALAN GELINDING Abidin, Zainal; Bagiasna, Komang; Noviyantha, Wayan
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.
ANALISIS TEORITIK DAN KAJI EKSPERIMENTAL UNTUK MENENTUKAN KEKAKUAN STATIK DARI BANTALAN ROL Iskandar, Ishak S; Bagiasna, Komang; Abidin, Zainal
Mesin Vol 12, No 2 (1997)
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Abstract

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 KELURUSAN GERAK DAN PEMOSISIAN MEJA MACHINING CENTER MILLAC 4H Bagiasna, Komang; 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.
KAJI EKSPERIMENTAL CIRI GETARAN PADA BANTALAN ROL DENGAN PEMBEBANAN STATIK Magiano, K; Bagiasna, Komang
Mesin Vol 24, No 1 (2009)
Publisher : Mesin

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Abstract

Any rolling bearing defect has a certain vibration response signature which can be observed through its waveform as well as frequency spectrum, such as the sideband frequencies, which indicate there is modulation phenomena among the vibration response signals. This research was carried out to study the vibration response signatures in the roll bearings due to the interaction between the static load and bearing inner/outer race waviness. This experimental research consists of FRF (Frequency Response Function) measurements to obtain the dynamic characteristics of the rolling bearing vibration, and power spectrum testing to measure the vibration response that occurs in the bearing. The shaft speed and static loads (vertical, horizontal, combination) are varied during the experimental study. Experimental results reveal Roll Passage Frequency (RPF) and its sidebands caused by the static load, and it was also found that waviness in the order of 4 at  the inner race and in the order of 6 at the outer race of the bearing.
ANALISIS EKSPERIMENTAL GETARAN BANTALAN BOLA DENGAN MENGGUNAKAN FRF ORDE TINGGI Sewoyo, Trihono; Bagiasna, Komang; Abidin, Zainal
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.
SEMI OTOMASI MESIN PENYEIMBANG Abidin, Zainal; Bagiasna, Komang; Purwowinarwan, Sigit; Iskandar, Ishak S
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.
PENERAPAN ANALISIS MODUS GETAR EKSPEFNMENTAL UNTUK IDENTIFIKASI PARAMETER MODUS GETAR STRUKTUR MEKANIK Bagiasna, Komang
Mesin Vol 9, No 1&2 (1990)
Publisher : Mesin

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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.
PENGEMBANGAN METODE PENYEIMBANGAN LANGSUNG TANPA MENGGUNAKAN MASSA COBA Iskandar, Ishak S; Abidin, Zainal; Bagiasna, Komang
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.
KONSTRUKSI MESIN PERKAKAS KONVENSIONAL DAN NC Bagiasna, Komang
Mesin Vol 4, No 3&4 (1985)
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Abstract

Mesin perkakas merupakan tulang punggung suatu proses manufakturing maupun suatu sistem produksi, kualitas produk yang dihasilkan tergantung pada interaksi yang terjadi antara benda kerja, perkakas potong dan mesin perkakasnya, dalam hal ini mesin perkakas merupakan salah satu faktor dominan yang mempengaruhi ketelitian benda kerja yang dihasilkan, karenanya mesin perkakas disebut juga sebagai induk dari mesin-meisn yang ada, Dalam makalah ini dibahas pula secara singkat hasil-hasil pengkajian baik eksperimental maupun teoritik yang telah dirintis selama ini di Laboratorium Teknik Produksi, Jurusan Teknik Mesin FTI-ITB.
Co-Authors Bintoro, Carolus Darto Darto Iskandar, Ishak S Magiano, K Monhendri, R Noviyantha, Wayan Purwowinarwan, Sigit Suharto, Djoko Trihono Sewoyo Tuan, Phan Anh Zainal Abidin