期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 84, 期 4, 页码 385-389出版社
SPRINGER
DOI: 10.1007/s00339-006-3641-x
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This paper presents a large displacement, piezoelectric-metal structure actuator, named the piezoelectric drum actuator. The drum actuator consists of a short, thick-walled steel cylinder sandwiched by two thin composite disks, which are fabricated from a brass disk bonded with a piezoceramic disk. The piezoceramic disk, which is polarized in its thickness direction, has a large diameter thickness ratio, producing a large radial displacement under an applied voltage in the thickness, leading to a large transverse deflection of the composite disks in the drum. The drum (outer diameter: 12.0 mm) has a displacement that is about eight times larger than that of a cymbal actuator made with the same ceramic material and comparable dimensions under the same dc driving voltage of 270 V. The drum actuator also showed a large resonance displacement of 56.7 mu m under an ac voltage of 90 V. The effective piezoelectric charge coefficient d'(33) of the drum is about twice as large as that reported for the cymbal.
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