Mapping Ultrasound Pulse--Echo Non-Stationarity

Seggie, D.A.; Hoddinott, John; Leeman, S.; Costa, Eduardo Tavares

doi:10.1117/12.940273

Cited by 3 publications

(1 citation statement)

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“…While the FFT is more suitable for the analysis of stationary linear signal. Actually, the SHG signal in higher harmonic experiments is a non-stationary [9], weak and complicated nonlinear time series which indirectly reflects the cumulative fatigue damage of metallic components [10]. Therefore, how to effectively extract the SHG signal and more reasonably evaluate the fatigue damage state of metallic components are key issues in nonlinear ultrasonic technique.…”

Section: Introductionmentioning

confidence: 99%

Fatigue evaluation of metallic components based on chaotic characteristics of second harmonic generation signal

Zhang¹,

Mao²,

Mao³

et al. 2018

J. vibroeng.

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In the nonlinear ultrasonic technique, the nonlinear received signal, such as second harmonic generation (SHG) signal in higher harmonic experiments, is complicated and non-stationary time series which reflects the fatigue damage of metal components. To effectively evaluate the fatigue damage of metal components, especially the earlier fatigue damage, the chaos and fractal theory are proposed to analyze the received signal of higher harmonic experiments. Chaotic characteristics, for example Lyapunov exponent, correlation dimension and Kolmogorov entropy, are extracted to evaluate the fatigue damage. Experiments results indicate that chaotic characteristics can reasonably characterize and evaluate the fatigue state of beams, which the variation trend of chaotic characteristics has a close relationship with fatigue crack propagation. Furthermore, chaotic characteristics are very sensitive to earlier fatigue damage of used connecting rods, especially the Lyapunov exponent. Therefore, chaos and fractal theory could effectively extract the nonlinear received signals, and chaotic characteristics could reasonably evaluate the fatigue damage state of metal components.

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Section: Introductionmentioning

confidence: 99%

Fatigue evaluation of metallic components based on chaotic characteristics of second harmonic generation signal

Zhang¹,

Mao²,

Mao³

et al. 2018

J. vibroeng.

View full text Add to dashboard Cite

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A Novel Pulse-Echo Attenuation Imaging Technique

1995

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Nonlinear Properties Analysis of Metallic Fatigue Damage Process Based on the Combined Nonlinear Parameter

Zhang¹,

Quan²,

Li³

et al. 2021

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To effectively extract the nonlinear properties of fatigue crack extension and evaluate the fatigue damage of metallic specimens, the chaos and fractal theory is applied to analyze the nonlinear output signal in a nonlinear ultrasonic experiment. A combined nonlinear parameter using the Lyapunov exponent, Kolmogorov entropy, and correlation dimension is proposed to evaluate the nonlinearity of fatigue damage. The nonlinear ultrasonic experiment is carried out on specimens with different stages of fatigue life, wherein the ultrasonic nonlinear output signal is collected and its combined nonlinear parameters are calculated. With the increase of fatigue damage in metallic specimens, the combined nonlinear parameter increases monotonically and tends to become saturated when a macroscopic crack appears, which indicates that complexity and randomness gradually increase during the accumulation of fatigue damage. According to microcrack propagation, the combined nonlinear parameter is very sensitive to the evolution of fatigue damage in metallic specimens, especially earlier fatigue damage. The relationship between the combined nonlinear parameter and the fatigue damage of specimens is established, which can provide an effective analytical method for evaluating fatigue damage and predicting the service life of specimens.

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Mapping Ultrasound Pulse--Echo Non-Stationarity

Cited by 3 publications

References 0 publications

Fatigue evaluation of metallic components based on chaotic characteristics of second harmonic generation signal

Fatigue evaluation of metallic components based on chaotic characteristics of second harmonic generation signal

A Novel Pulse-Echo Attenuation Imaging Technique

Nonlinear Properties Analysis of Metallic Fatigue Damage Process Based on the Combined Nonlinear Parameter

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