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Location identification of closed crack based on Duffing oscillator transient transition
- Source :
- Mechanical Systems and Signal Processing. 100:384-397
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The existence of a closed micro-crack in plates can be detected by using the nonlinear harmonic characteristics of the Lamb wave. However, its location identification is difficult. By considering the transient nonlinear Lamb under the noise interference, we proposed a location identification method for the closed crack based on the quantitative measurement of Duffing oscillator transient transfer in the phase space. The sliding short-time window was used to create a window truncation of to-be-detected signal. And then, the periodic extension processing for transient nonlinear Lamb wave was performed to ensure that the Duffing oscillator has adequate response time to reach a steady state. The transient autocorrelation method was used to reduce the occurrence of missed harmonic detection due to the random variable phase of nonlinear Lamb wave. Moreover, to overcome the deficiency in the quantitative analysis of Duffing system state by phase trajectory diagram and eliminate the misjudgment caused by harmonic frequency component contained in broadband noise, logic operation method of oscillator state transition function based on circular zone partition was adopted to establish the mapping relation between the oscillator transition state and the nonlinear harmonic time domain information. Final state transition discriminant function of Duffing oscillator was used as basis for identifying the reflected and transmitted harmonics from the crack. Chirplet time-frequency analysis was conducted to identify the mode of generated harmonics and determine the propagation speed. Through these steps, accurate position identification of the closed crack was achieved.
- Subjects :
- Engineering
business.industry
Noise (signal processing)
Mechanical Engineering
Autocorrelation
Aerospace Engineering
Duffing equation
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Computer Science Applications
Nonlinear system
Lamb waves
Control and Systems Engineering
Control theory
Harmonics
0103 physical sciences
Signal Processing
Harmonic
Transient (oscillation)
0210 nano-technology
business
010301 acoustics
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 08883270
- Volume :
- 100
- Database :
- OpenAIRE
- Journal :
- Mechanical Systems and Signal Processing
- Accession number :
- edsair.doi...........22a35cbbfc28bb4f7be01a0df6c47349