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Multi-Order Mode Excitation and Separation of Ultrasonic Guided Waves in Rod Structures Using 2D-FFT
Gang Li1, Jing Zhang1, Juke Cheng1
1Department of Civil Engineering, Hefei University of Technology, Hefei 230009, China.
This study introduces a novel method for separating single ultrasonic guided wave modes from mixed signals in cylindrical rods. The technique accurately isolates specific wave modes for enhanced structural integrity analysis.
Area of Science:
- Materials Science and Engineering
- Acoustics and Ultrasonics
- Non-Destructive Testing
Background:
- Ultrasonic guided waves are crucial for non-destructive structural testing.
- Extracting pure single modes from multi-order mixed modes is a key challenge.
- Accurate mode separation is essential for reliable structural health monitoring.
Purpose of the Study:
- To develop and validate a method for exciting and separating single ultrasonic guided wave modes in cylindrical rods.
- To demonstrate the effectiveness of frequency-wavenumber domain analysis for mode isolation.
- To provide a foundation for utilizing isolated modes in advanced structural analysis.
Main Methods:
- Simulation of ultrasonic guided wave propagation in cylindrical rods.
- Broadband signal excitation to generate multi-order modes within a specific frequency range.
- Two-dimensional Fourier transform to convert time-space signals to the frequency-wavenumber domain.
- Dynamic programming for frequency-wavenumber ridge extraction.
- Reconstruction of single-mode time-domain signals.
Main Results:
- Accurate excitation of multi-order ultrasonic guided wave modes in rod structures was achieved.
- High-purity single-mode wave separation was successfully demonstrated.
- Comparison with theoretical results confirmed the accuracy of the excited and separated modes.
Conclusions:
- The proposed method effectively excites multi-order modes in rod structures.
- The dynamic programming-based approach enables high-purity single-mode separation.
- This technique lays the groundwork for advanced applications utilizing isolated ultrasonic guided wave modes.
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