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Signal Processing Techniques for Nonlinear Identification of Structures Using Transient Response

In this work, an alternate method for the nonlinear system identification of vibrating structures is investigated. This method makes use of transient vibrations in combination with advanced signal processing techniques to determine hardening or softening effects and strength of nonlinearity. In order to demonstrate this method’s practicality and how transient vibrations can be used to determine nonlinearity, an experiment involving a cantilever beam has been subjected to vibratory analysis. Furthermore, a novel signal tracking technique, known as the Harmonics Tracking Method, has been used in conjunction with experimental data for signal analysis and compared to another widely known signal processing tool called the Hilbert-Huang Transform. The nonlinear characteristics of a structure can play a significant role in its behavior or response to stimuli. Thus, knowing these characteristics can lead to better design analysis and predictions of system responses.