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A miniature class V flextensional cymbal transducer with directional beam patterns: the double-driver
J Zhang1, A C Hladky-Hennion, W J Hughes
1Materials Research Laboratory, The Pennsylvania State University, University Park 16802, USA. jindongzhang@hotmail.com
Ultrasonics
|March 29, 2001
Summary
Researchers developed a directional "double-driver" cymbal transducer using piezoelectric disks. This innovative transducer achieves a directional cardioid beam pattern, enhancing sound projection and enabling advanced acoustic applications.
Area of Science:
- Acoustic Engineering
- Transducer Technology
- Materials Science
Background:
- Directional sound projection is crucial for advanced acoustic systems.
- Flextensional transducers offer efficient acoustic power conversion.
- Piezoelectric materials provide electromechanical transduction capabilities.
Purpose of the Study:
- To describe the design and performance of a novel "double-driver" cymbal transducer.
- To investigate the acoustic directivity characteristics of the transducer.
- To demonstrate the feasibility of an array of these transducers for enhanced directional sound.
Main Methods:
- The transducer utilizes a bilaminar piezoelectric disk with metal caps for mechanical transformation.
- Directivity is achieved by exciting the transducer in a combined flexural and bending mode.
- Finite element modeling was used to predict the beam pattern, validated by experimental measurements.
Main Results:
- The "double-driver" cymbal transducer exhibits a cardioid beam pattern.
- Finite element modeling predictions closely matched experimental results.
- A 3x3 array demonstrated a front-to-back ratio exceeding 20 dB under optimal conditions.
Conclusions:
- The "double-driver" cymbal is an effective directional class V flextensional transducer.
- The design enables controlled sound pressure addition and cancellation for directivity.
- The array configuration shows potential for high-performance directional acoustic systems.
