A miniature class V flextensional cymbal transducer with directional beam patterns: the double-driver
✍ Scribed by J Zhang; A.C Hladky-Hennion; W Jack Hughes; R.E Newnham
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 308 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0041-624X
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✦ Synopsis
The ``double-driver'' cymbal, a directional class V ¯extensional transducer, is described in this paper. Its basic structure is a bilaminar piezoelectric disk with metal caps as mechanical transformers and ampli®ers. The directivity was accomplished by exciting the double-driver in a combined ¯exural and bending mode causing the sound pressure to add in one direction and cancel in the opposite direction. The cardioid beam pattern predicted by ®nite element modeling agreed well with the experimental measurements. A 3 Â 3 double-driver array was constructed to demonstrate that under optimal conditions the array can provide a directional beam pattern with a front-to-back ratio of more than 20 dB.