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Orkun Özşahin

Department of Mechanical Engineering
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Identification of spindle dynamics by receptance coupling for non-contact excitation system
Özşahin, Orkun; Ritou, Mathieu; Budak, Erhan; Rabréau, Clément; Le Loch, Sébastien (Elsevier BV; 2019-01-01)
The identification of spindle dynamics plays a crucial role in accurate prediction of the stability diagrams for high speed machining operations. In this study, variations of the mode shapes of the tool-spindle assembly at...
Use of inverse stability solutions for identification of uncertainties in the dynamics of machining processes
Tunc, Lutfi Taner; Özşahin, Orkun (Springer Science and Business Media LLC, 2018-09-01)
Research on dynamics and stability of machining operations has attracted considerable attention. Currently, most studies focus on the forward solution of dynamics and stability in which material properties and the frequenc...
High speed tooltip FRF predictions of arbitrary tool-holder combinations based on operational spindle identification
Postel, M.; Özşahin, Orkun; Altintas, Y. (Elsevier BV, 2018-06-01)
The chatter vibrations in milling are avoided by selecting spindle speeds and depth of cuts from the stability lobes. However, it has been well observed that the structural dynamics of the spindle system change as a functi...
Determination of tool point FRF of micro tools under operational conditions using analytical methods
Özşahin, Orkun (Journal of the Faculty of Engineering and Architecture of Gazi University, 2018-01-01)
Tool point Frequency Response Function (FRF) for micro tools cannot be measured using impact testing and modal analysis. In addition, micro machining operations are performed at high spindle speeds and due to the gyroscopi...
Stability of Milling Operations With Asymmetric Cutter Dynamics in Rotating Coordinates
Comak, Alptunc; Özşahin, Orkun; Altintas, Yusuf (2016-08-01)
High-speed machine tools have parts with both stationary and rotating dynamics. While spindle housing, column, and table have stationary dynamics, rotating parts may have both symmetric (i.e., spindle shaft and tool holder...
Receptance coupling based algorithm for the identification of contact parameters at holder-tool interface
Matthias, W.; Özşahin, Orkun; Altintas, Y.; DENKENA, B. (Elsevier BV, 2016-05-01)
To identify stable cutting conditions with a high depth of cut, stability lobe diagrams are used. In order to predict these diagrams, frequency response functions (FRF) at the tool tip are required for every tool, holder a...
Identification of bearing dynamics under operational conditions for chatter stability prediction in high speed machining operations
Özşahin, Orkun; Budak, E.; Özgüven, Hasan Nevzat (2015-10-01)
Chatter is a major problem causing poor surface finish, low material removal rate, machine tool failure, increased tool wear, excessive noise and thus increased cost for machining applications. Chatter vibrations can be av...
Prediction of frequency response function (FRF) of asymmetric tools from the analytical coupling of spindle and beam models of holder and tool
Özşahin, Orkun; Altintas, Y. (2015-05-01)
The prediction of chatter stability diagrams in milling requires accurate frequency response functions (FRF) at the tool - workpiece contact zone. Traditionally, the most accurate FRFs are best obtained through the experim...
In-process tool point FRF identification under operational conditions using inverse stability solution
Özşahin, Orkun; Budak, E.; Özgüven, Hasan Nevzat (2015-02-01)
Self-excited vibrations of machine tools during cutting result in process instability, poor surface finish and reduced material removal rate. In order to obtain stability lobe diagrams to avoid chatter vibrations, tool poi...
Analytical modeling of asymmetric multi-segment rotor - bearing systems with Timoshenko beam model including gyroscopic moments
Özşahin, Orkun; Özgüven, Hasan Nevzat; Budak, E. (2014-11-01)
In this study, analytical modeling and an analysis approach for asymmetric multi-segment rotor bearing systems are presented. Timoshenko beam model which includes the effect of gyroscopic moments is employed for modeling r...