Hasan Nevzat Özgüven

Experimental modal analysis of nonlinear systems by using response-controlled stepped-sine testing
Karaağaçlı, Taylan; Özgüven, Hasan Nevzat (Elsevier BV, 2021-1)
Although the identification and analysis of structures with a localized nonlinearity, either weak or strong, is within reach, identification of multiple nonlinearities coexisting at dif- ferent locations is still a challen...
A frequency domain nonparametric identification method for nonlinear structures: Describing surface method
Karaagacli, Taylan; Özgüven, Hasan Nevzat (Elsevier BV, 2020-10-01)
In this paper a new method called 'Describing Surface Method' (DSM) is developed for nonparametric identification of a localized nonlinearity in structural dynamics. The method makes use of the Nonlinearity Matrix concept ...
A novel modal superposition method with response dependent nonlinear modes for periodic vibration analysis of large MDOF nonlinear systems
Ferhatoglu, Erhan; Ciğeroğlu, Ender; Özgüven, Hasan Nevzat (Elsevier BV, 2020-01-01)
Design of complex mechanical structures requires to predict nonlinearities that affect the dynamic behavior considerably. However, finding the forced response of nonlinear structures is computationally expensive, especiall...
Evaluation of Surrogate-Based Modeling Methods for the Optimization of Helicopter Rotor Structures for Minimum Vibration
Bilen, Muhammed Emre; Ciğeroğlu, Ender; Özgüven, Hasan Nevzat (null; 2019-11-02)
Helicopters are notorious for their high vibration levels and the rotors are the main contributors. At preliminary stages, it is essential to design the rotors to achieve minimum vibration amplitudes, which is generally re...
Comparison of Linear and Nonlinear Modal Reduction Approaches
Ferhatoğlu, Erhan; Dreher, Tobias; Ciğeroğlu, Ender; Krack, Malte; Özgüven, Hasan Nevzat (null; 2019-01-31)
Periodic vibration response of nonlinear mechanical systems can be efficiently computed using Harmonic Balance Method. However, computational burden may still be considerable and impede extensive parametric studies needed ...
Dynamic characterization of double-relief profile modifications in planetary gear systems, (27 - 29 Ağustos 2018)
Öztürk, Veysel Yalın; Ciğeroğlu, Ender; Özgüven, Hasan Nevzat (null; 2018-08-27)
Being similar to parallel-axis gear systems, application of proper profile modifications inplanetary gearing is an effective way of reducing the adverse dynamic effects, such asexcessive noise and reduced fatigue life due ...
A new modal superposition method for nonlinear vibration analysis of structures using hybrid mode shapes
Ferhatoglu, Erhan; Ciğeroğlu, Ender; Özgüven, Hasan Nevzat (Elsevier BV, 2018-07-01)
In this paper, a new modal superposition method based on a hybrid mode shape concept is developed for the determination of steady state vibration response of nonlinear structures. The method is developed specifically for s...
FRF decoupling of nonlinear systems
Kalayclogiu, Taner; Özgüven, Hasan Nevzat (2018-03-01)
Structural decoupling problem, i.e. predicting dynamic behavior of a particular substructure from the knowledge of the dynamics of the coupled structure and the other substructure, has been well investigated for three deca...
Extended Abstract: Dynamic Behavior of a Compliant Mechanism Driven by Stacked Piezoelectric Actuators
Koyuncu, A.; Şahin, Melin; Özgüven, Hasan Nevzat (2018-02-15)
Mechanical amplifiers are employed to enhance output displacement of piezoelectric actuators. Dynamic behavior of such an amplified piezoelectric actuator needs to be known accurately in order to verify its suitability for...
Localization and identification of structural nonlinearities using cascaded optimization and neural networks
Koyuncu, A.; Ciğeroğlu, Ender; Özgüven, Hasan Nevzat (Elsevier BV, 2017-10-01)
In this study, a new approach is proposed for identification of structural nonlinearities by employing cascaded optimization and neural networks. Linear finite element model of the system and frequency response functions m...