Directivity and Excitability of Ultrasonic Shear Waves Using Piezoceramic Transducers-Numerical Modeling and...

Area of Science:

• Acoustics
• Materials Science
• Mechanical Engineering

Background:

• Piezoceramic transducers are crucial for generating ultrasonic waves.
• Shear horizontal waves have unique properties valuable in various applications.
• Controlling wave modes and directivity is essential for efficient energy transfer.

Purpose of the Study:

• To investigate piezoceramic-based excitation of shear horizontal waves.
• To model and analyze the directivity and excitability of shear horizontal fundamental modes.
• To optimize transducer design for maximizing shear wave generation and minimizing unwanted modes.

Main Methods:

• Finite-element method (FEM) modeling of a thickness-shear d15 piezoceramic transducer.
• Numerical simulations to assess directivity and excitability.
• Experimental validation of the simulated results.

Main Results:

• Transducer geometry significantly impacts wave directivity more than excitability.
• Experimental results confirm that transducer bonding critically affects directivity and amplitude.
• FEM simulations accurately predict wave behavior, validated by experiments.

Conclusions:

• Tailoring transducer geometry at resonant frequency is crucial for achieving desired directivity.
• Transducer bonding is a significant factor in controlling excited shear wave modes.
• Optimized piezoceramic actuators can efficiently generate shear horizontal waves for specific applications.