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Komang Bagiasna
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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)
Publisher : Mesin

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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.
CRACK DETECTION USING OPERATING DEFLECTION SHAPE Djoko Suharto; Komang Bagiasna; Zainal Abidin
Mesin Vol. 21 No. 1 (2006)
Publisher : Mesin

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This research presents development of vibration-based crack detection method using operating deflection shape (ODS) analysis from data measured by a Laser Doppler Vibrometer (LDV). Two types of work are conducted in this research. The first work is a numerical study, while the second work is an experimental study to verify the proposed method. In the numerical study, two types of specimen are used to simulate 2-Dimensional and 3-Dimensional problems using NASTRAN code. For the 2-Dimensional model, beams with two types of crack are tested, namely center and edge cracks. For the 3-Dimensional model, a plate specimen is tested. The length of the cracks and their locations are used as parameters to observe the ability of the proposed method to detect the existence and the location of the cracks. The results of numerical study show that the existence of cracks can be detected by using the natural frequency drops and the location of the cracks can be pinpointed by using the proposed S.Sd.D.Ms method (Square of the Second Derivative of the Deviation of the Mode Shape). In order to test the reliability of the proposed method, an experimental study is required. In this experimental study, FRF ODS measurements are conducted to derive the mode shape. Three types of specimen are measured, namely intact beam, center cracked beam, multiple center cracked beam and multiple edge cracked beam. The results of experimental study confirm that the proposed method can be used to detect the location of the cracks.
KAJI EKSPERIMENTAL CIRI GETARAN PADA BANTALAN ROL DENGAN PEMBEBANAN STATIK K Magiano; Komang Bagiasna
Mesin Vol. 24 No. 1 (2009)
Publisher : Mesin

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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.
EVALUASI POLA FUNGSI RESPON FREKUENSI PADA RESPON GETARAN BANTALAN GELINDING R Monhendri; Komang Bagiasna
Mesin Vol. 24 No. 2 (2009)
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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.
KONSTRUKSI MESIN PERKAKAS KONVENSIONAL DAN NC Komang Bagiasna
Mesin Vol. 4 No. 3&4 (1985)
Publisher : Mesin

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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 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