The tool allows for the instantaneous estimation of parameters of nonlinear systems. It relies on the Short Time Fourier Transform (STFT) time-frequency approach.
The proposed tool for the instantaneous identification of nonlinear systems relies on a time-frequency approach. The entailing formulation determines model parameters that minimize an error function between time-frequency representations of measured and simulated signals, respectively. In greater detail, the representation adopted here is the Short Time Fourier Transform (STFT). The tuning of a simple single degree of freedom oscillator endowed with a Bouc-Wen hysteretic spring is provided as application example. In order to start the algorithm:
- Download and extract the archive
- Enter the extracted folder
- Run the MatLAB script “Script_TF_v1.m”.
The implementation of a generic state space model is straightforward.
Oreste S. Bursi, Giuseppe Abbiati, Rosario Ceravolo
Bursi, O. S., Ceravolo, R., Erlicher, S., & Zanotti Fragonara, L. (2012). Identification of the hysteretic behaviour of a partial-strength steel-concrete moment-resisting frame structure subject to pseudodynamic tests. Earthquake Engineering & Structural Dynamics, 41(14), 1883–1903. doi:10.1002/eqe.2163
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