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Bagiasna, Komang
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Mechanical Engineering

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

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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.
CRACK DETECTION USING OPERATING DEFLECTION SHAPE Suharto, Djoko; Bagiasna, Komang; Abidin, Zainal
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.
MEASURING AND COMPENSATING FOR OFF-LINE TO RUNNING MACHINERY MOVEMENT Tuan, Phan Anh; Abidin, Zainal; Bagiasna, Komang
Mesin Vol 20, No 2 (2005)
Publisher : Mesin

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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.
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