Abstract
In the active Lamb wave based monitoring of plate structural health, it is difficult to extract damage information from active Lamb waves based on single sensor collection. Based on the Hilbert–Huang transform (HHT) instantaneous processing method, this paper proposes to study the damage information carried by a single sensor monitoring signal from the instantaneous parameter characteristics of the signal. The instantaneous phase change caused by the phase difference between the damage scattering wave and the direct wave is studied. The change of the marginal spectrum amplitude in the effective range caused by the damage scattering wave is studied in continuous multiple frequency bands. Finally, the damage information extraction based on a single sensor monitoring signal is realized. From the model analysis and experimental results, it is reliable and feasible to realize the active Lamb wave based monitoring of plate structural health according to the instantaneous parameter change characteristics from a single sensor signal.
Highlights
Modern aircraft mostly adopt composite plate structures to meet the requirements for multifunctionality, high mobility, and high reliability
Lamb waves was studied in this paper, which proved the feasibility of extracting damage information from the instantaneous phase and marginal spectral changes of a single sensor signal
This paper provides a diagnostic method for active Lamb wave based monitoring based on instantaneous parameter characteristic changes
Summary
Modern aircraft mostly adopt composite plate structures to meet the requirements for multifunctionality, high mobility, and high reliability. In the research of active Lamb wave monitoring technology, finding an advanced signal processing method to extract damage information directly from a single sensing signal has been a hot spot of structural health monitoring research. Xu et al [25] introduced HHT signal processing technology into the active Lamb wave based monitoring of plate structural health. In their method, the marginal spectrum of the monitoring signal was obtained and compared with the spectrum. The rest of this paper is organized as follows: In Section 2, HHT-based signal processing and the principle of active Lamb wave based monitoring of a plate structural health is presented.
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