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7 results on '"Hızarcı, Berkan"'

4. Yakınsak-Konik Nozulların Giriş ve Çıkış Çaplarının İtme Kuvveti ve Hacimsel Debi Üzerindeki Etkisinin Teorik, Nümerik ve Deneysel İncelemesi.

Author

Hızarcı, Berkan and Kıral, Zeki

Subjects
NOZZLES, COMPUTATIONAL fluid dynamics, EULER equations, DIAMETER, SHOCK waves
Abstract

Copyright of Dokuz Eylul University Muhendislik Faculty of Engineering Journal of Science & Engineering / Dokuz Eylül Üniversitesi Mühendislik Fakültesi Fen ve Mühendislik Dergisi is the property of Dokuz Eylul Universitesi Muhendislik Fakultesi Fen ve Muhendislik Dergisi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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6. Optimal extended state observer based control for vibration reduction on a flexible cantilever beam with using air thrust actuator

Author

Kıral, Zeki, Şahin, Savaş, and Hızarcı, Berkan

Subjects
Acoustics and Ultrasonics
Abstract

The idea of using air thrusts for vibration control of structures has gained attention since the 1990s. However, only discontinuous controllers and switching functions have been studied with these actuators. Therefore, the main motivation of this study is to investigate air thrusters with continuous control methods for vibration reduction on a flexible cantilever beam. First, the finite element model of the flexible cantilever beam is defined. The order of the model is reduced according to the effective mass participation factor using the mode displacement method to obtain a controllable and observable system. The fundamental dynamics of the air thrust actuator, such as time constant, delay time and bandwidth, have been determined by system identification and considered in the control system. In this study, optimal extended state observer-based control (optimal ESOBC) tuned by optimal control law and particle swarm optimization (PSO) is proposed and compared to linear quadratic Gaussian (LQG) and positive position feedback (PPF) controllers. The performance of the controllers has been evaluated under several experiments such as initial displacement, impulsive disturbance, structure uncertainty and actuator uncertainty. The effectiveness of the controllers is determined by the RMS value of the beam displacement and the total air consumption. The results show that the ESOBC controlled air thrust actuator has suppressed beam vibrations more successfully than LQG and PPF controllers. In addition, the proposed method is found to be effective for low-frequency vibration suppression on flexible structures.

Published
2022

7. Titreşim Bölgesi Analizi ile Bir Dişli Kutusunda Yüzey Oyukçuk Hata Seviyelerinin Tespiti.

Author

Hızarcı, Berkan, Ümütlü, Rafet Can, Kıral, Zeki, and Öztürk, Hasan

Abstract

The monitoring of gearbox is a matter of concern to the industry in terms of cost and downtime reduction. This work focuses on the condition monitoring of a helical gearbox and the determination of the effect of pitting faults formed on tooth surface on vibration of helical gearbox. In addition to studies related to determination of faults in gearboxes in the literature, the vibration zone of the gearbox is extracted by using instantaneous acceleration values taken from the helical gearbox on the two directions. This vibration zone is recorded as an image in a binary system and the area of the vibration zone is calculated by using image processing algorithms. The area of the vibration zone gives information about the condition of the gearbox. As a result of the experiments carried out, it has been seen that the vibration zone analysis is a successful method for condition monitoring of a gearbox. [ABSTRACT FROM AUTHOR]

Published
2018

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