Yazar "Orhan S." seçeneğine göre listele

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    Determination of physical faults in gearbox through vibration analysis
    (2003) Orhan S.; Aktürk N.
    Gears are important machine elements that provide motion or power transmission. Accuracy and quality of work done is directly related to the continuous motion transmission in a machine. Therefore, the determination of faults on a gear and replacing it without stopping the production is important, particularly in gear boxes used in the continuous production lines. In this study fault detection on a gear through vibration analysis is briefly given and results of vibration analysis of a compressor gearbox are also given as a case study. It is shown that vibration monitoring is an effective tool for fault diagnostics.
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    Determination of rolling element bearing defects through vibration analysis
    (2003) Orhan S.; Arslan H.; Aktürk N.
    Determination of rolling element bearing defects through the available vibration analysis method is studied in this paper. Rolling element bearing defect vibrations, vibration measurement and their analysis is briefly given. The outer ring rolling surface defect diagnosis of a cylindrical rolling element bearing is investigated as a case study. As stated the literature, it is determined in the waveform graph of the vibration that is formed by a single point defect on the outer ring of rolling element bearing that impact signals occur that its frequency equals to ball passage frequency on the outer ring and, in the spectrum graph the frequency of the impact signals is order of rolling element bearing defect frequencies. It is seen that vibration analysis can be effectively used to determine rolling element bearing defects from the obtained results.
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    Korovkin type theorems in weighted Lp-spaces via statistical A-summability
    (Universitatii Al.I.Cuza din Iasi, 2016) Orhan S.; Acar T.; Dirik F.
    In this paper, we study Korovkin type approximation theorems on weighted spaces (formula presented) and (formula presented), with help of statistical A-summability which is stronger than A -statistical convergence. Also, we construct examples such that our new approximation result works but its statistical case does not work. © 2016, Universitatii Al.I.Cuza din Iasi. All rights reserved.
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    Modeling of the vibrations caused by ball bearing defects
    (2003) Arslan H.; Orhan S.; Aktürk N.
    In this study a shaft-ball bearing system is modeled in order to investigate the vibrations of ball bearings with running surfaces defects. Shaft and bearing was modeled as mass-spring system and balls were assumed have masses in order to investigate the effects of the balls on the overall vibrations. It is well known that the behaviour of the system has a nonlinear character under dynamic conditions. Equations of motion were obtained and solved with a computer program developed in order to study the radial and axial vibrations. The results obtained from simulation program for shaft and balls were analyzed both time and frequency domains. The ball masses are shown not to have a significant effect on the overall vibration behaviour of the shaft bearing system. The vibrations of shaft and the ball bearing system have been observed to have sensivity for different working conditions. The effects of localized defects on bearing running surfaces (i.e. surfaces of inner and outer rings and balls) on the shaft-ball bearing vibrations were investigated by using the simulation program. When the results obtained from the computer simulation have been compared with previous studies available in the literature, a reasonably good agreement has been observed.