Identification of structural non linearities using describing functions and Sherman Morrison matrix inversion method

Özer, Mehmet Bülent
Royston, Thomas J


Identification of structural non-linearities using describing functions and the Sherman-Morrison method
Ozer, Mehmet Bulent; Özgüven, Hasan Nevzat; Royston, Thomas J. (Elsevier BV, 2009-01-01)
In this study, a new method for type and parametric identification of a non-linear element in an otherwise linear structure is introduced. This work is an extension of a previous study in which a method was developed to localize non-linearity in multi-degree of freedom systems and to identify type and parameters of the non-linear element when it is located at a ground connection of the system. The method uses a describing function approach for representing the non-linearity in the structure. The describing ...
Identification of nonlinearities in structural dynamics by using artificial neural networks and optimization
Koyuncu, Anıl; Özgüven, Hasan Nevzat; Ciğeroğlu, Ender; Department of Mechanical Engineering (2013)
Many real life engineering structures exhibit nonlinear behavior in practice. Although there are sophisticated methods including the effect of nonlinearities on dynamic response of structures in literature, uncertainties about nonlinear elements make further investigation necessary for modeling nonlinearity, and this is usually achieved by using experimental data taken from real systems. Therefore, identification of nonlinearities -determining location, type and parameters of the nonlinear elements- is crit...
Identification of electromagnetic scattering mechanisms by two dimensional windowed fourier transform approach
Germeç, K. Egemen; Kuzuoğlu, Mustafa; Department of Electrical and Electronics Engineering (2004)
In this thesis, it is demonstrated that the two-dimensional Windowed Fourier Transform (WFT) can be effectively used to analyze the local spectral characteristics of electromagnetic scattering signals in the two-dimensional spatial frequency domain. The WFT is the extension of the Short Time Fourier Transform (STFT), which was originally derived to analyze the local spectral characteristics of one dimensional time functions. Since the WFT focuses on the local spectral behavior of the scattered field, the si...
Identification of spindle dynamics by receptance coupling for non-contact excitation system
Özşahin, Orkun; 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 high spindle speeds are examined using numerical models and hypotheses are formulated. An identification method of spindle dynamics is proposed, dedicated to non-contact excitation system; from which only cross FRF can be obtained (instead of tool tip FRF classically). Then, spindle dynam...
Identification of localized nonlinearity for dynamic analysis of structures
Aykan, Murat; Özgüven, Hasan Nevzat; Department of Mechanical Engineering (2013)
Most engineering structures include nonlinearity to some degree. Depending on the dynamic conditions and level of external forcing, sometimes a linear structure assumption may be justified. However, design requirements of sophisticated structures such as satellites, stabilized weapon systems and radars may require nonlinear behavior to be considered for better performance. Therefore, it is very important to successfully detect, localize and parametrically identify nonlinearity in such cases. In engineering ...
Citation Formats
M. B. Özer and T. J. Royston, “Identification of structural non linearities using describing functions and Sherman Morrison matrix inversion method,” 2005, Accessed: 00, 2021. [Online]. Available: