Feedback-responsive piezoelectric vibrating device
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United States of America Patent
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-
Aug 15, 2000
Grant Date -
N/A
app pub date -
Mar 25, 1998
filing date -
Apr 28, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method is disclosed for advantageously modifying the texture or character of a plastic work material by applying acoustic energy at the work material's natural resonant frequency via a transducer assembly including vibrating the transducer assembly in air to determine the natural resonant frequency of the transducer assembly; determining the natural resonant frequency of the work material and the transducer assembly together; subtracting the natural resonant frequency of the transducer assembly from the natural resonant frequency of the work material and the transducer assembly together to determine the natural frequency of the work material; and applying acoustic energy to the work material at the determined natural frequency of the work material. The transducer assembly includes piezoelectric actuators which provide the acoustic energy.
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