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Characterization of Mechanical Loss in Piezoelectric Materials Using Temperature and Vibration Measurements
Author(s) -
Shekhani Husain N.,
Uchino Kenji
Publication year - 2014
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12998
Subject(s) - vibration , materials science , piezoelectricity , mechanical impedance , electrical impedance , loss factor , mechanical resonance , acoustics , ceramic , sweep frequency response analysis , composite material , electrical engineering , optoelectronics , physics , dielectric , engineering
In this research, a unique approach for characterizing mechanical loss in piezoelectric materials is developed. Instead of characterizing mechanical loss through electrical measurements, thermal and mechanical measurements are used. A comprehensive heat transfer model has been developed to describe the temperature rise due to heat generation in piezoelectric materials in resonance conditions. Using this model, along with experimental temperature and vibration measurements, the mechanical quality factor can be calculated. Advantages of this method over electrical impedance methods include high sensitivity to change in losses due to precise temperature and vibration measurements and evaluation of losses from a single frequency (versus a frequency sweep). This method has been applied to a hard PZT ceramic at several frequencies near its fundamental resonance at a tip vibration velocity of 300 mm/s RMS. In these high power conditions, the standard deviation of the mechanical quality factor resulting from the impedance data was 15%, while those resulting from the new method are less than 2.5%. The results from the impedance measurements using a constant vibration velocity sweep agree with the magnitude of the quality factor calculated from new method, giving evidence to its validity.