Issue 65

V. Le-Ngoc et alii, Frattura ed Integrità Strutturale, 65 (2023) 300-319; DOI: 10.3221/IGF-ESIS.65.20

Feature extraction Using vibration signal analysis, researchers can study the frequency components of a mechanical system by measuring its vibration response to external stimuli or internal forces. The spectrum of a vibration signal provides valuable information about the mechanical behaviour of the system, including its natural frequencies, damping ratios, and mode shapes. Spectrum analysis is a powerful tool in signal processing that allows us to understand a signal's sinusoidal components at different frequencies. By performing a Fourier transform on a signal, it is possible to determine its spectrum. The spectrum can provide insights into the underlying physical processes that generate the signal. Additionally, the spectral analysis of the vibration signal can identify anomalies or defects in the system by analyzing the frequency response number of a structure for external forces. Furthermore, researchers can obtain information about its stiffness and damping properties to evaluate structures' performance and safety. Therefore, we use the spectrum in this study to look for the sensitive feature.

Figure 7: Original signal of twelve states.

Figure 8: The spectrums of twelve states.

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