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Published on: August 21, 2018
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A variable-frequency bidirectional shear horizontal (SH) wave transducer based on dual face-shear (d24) piezoelectric
Hongchen Miao1, Qiang Huan2, Faxin Li2
1Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
Ultrasonics
|May 1, 2018
Summary
A novel bidirectional piezoelectric transducer excites shear horizontal (SH0) waves, enabling focused wave beams for structural health monitoring (SHM). This transducer offers directional control and broad frequency operation, enhancing SHM capabilities.
Area of Science:
- Materials Science
- Mechanical Engineering
- Nondestructive Testing
Background:
- Guided wave-based structural health monitoring (SHM) relies on efficient wave generation and control.
- The fundamental shear horizontal (SH0) wave is crucial for SHM due to its non-dispersive nature.
- Existing transducers have limited control over SH0 wave radiation patterns.
Purpose of the Study:
- To propose and evaluate a variable-frequency bidirectional SH0 wave piezoelectric transducer (BSH-PT).
- To enable focused SH0 wave beams for improved SHM signal interpretation and power efficiency.
- To assess the transducer's performance in generating and controlling SH0 waves.
Main Methods:
- Design and fabrication of a BSH-PT using two rectangular face-shear (d24) PZT wafers.
- Finite element simulations to model the transducer's behavior.
- Experimental testing to validate simulation results and assess performance.
Main Results:
- The BSH-PT successfully generates pure SH0 waves.
- Bidirectional focusing of the SH0 wave beam is achieved.
- The bidirectional characteristics are maintained over a wide frequency range (150-250 kHz).
Conclusions:
- The proposed BSH-PT offers effective bidirectional SH0 wave generation and focusing.
- Its wide frequency range and directional control are advantageous for SHM applications.
- The transducer shows potential for SHM systems in hollow cylindrical structures using circumferential SH0 (CSH0) waves.
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