The analysis of nonlinear systems in the frequency domain using Nonlinear Output Frequency Response Functions

Nonlinear Analysis of Nonlinearly Loaded Dipole Antenna in the Frequency Domain Using Fuzzy Inference

In this paper, inference model is proposed so as to analyze nonlinearly loaded dipole antenna. In modeling process, linear and nonlinear behavior of the problem is saved as simple and unchanged membership functions and the effect of incident wave on the induced voltage at different harmonies are then extracted easily. Consequently the model achieved is more efficient than previous studies using...

Relationships between the Nonlinear Output Frequency Response Functions of Multi- Degree-of-Freedom Nonlinear Systems

Crack detection using nonlinear output frequency response functions

The new concept of nonlinear output frequency response functions (NOFRFs) is introduced in this paper to detect cracks in beams using frequency domain information. The results show that the NOFRFs are a sensitive indicator of the presence of cracks providing the excitation is of an appropriate intensity. They also constitute an indicative and promising basis, which must further be explored, so ...

Output Frequency Response Function based Analysis for Nonlinear Volterra Systems

Analysis of nonlinear systems has been studied extensively. Based on some recently developed results, a new systematic approach to the analysis of nonlinear Volterra systems in the frequency domain is proposed in this paper, which provides a novel insight into the frequency domain analysis and design of nonlinear systems subject to a general input instead of only specific harmonic inputs using ...

Nonlinear median transform domain denoising of frequency response functions

ABSTRACT Frequency response functions (FRF) are the primary means of experimentally evaluating the structural characteristics of vibrating systems. Vibration analyzers estimate the FRF through the ratio of the output/input power spectral densities (PSD); which in turn are estimated using periodograms. However, periodograms are inconsistent estimators. In addition, noise in the input and output ...