Title page for etd-0719110-175233


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URN etd-0719110-175233
Author Ting-chun Chen
Author's Email Address m973020034@student.nsysu.edu.tw
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Department Mechanical and Electro-Mechanical Engineering
Year 2009
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Determination of Piezoelectric Parameters from Measured Natural Frequencies of a Piezoelectric Circular Plate
Date of Defense 2010-07-03
Page Count 128
Keyword
  • piezoelectric constants
  • genetic algorithm
  • piezoelectric material
  • vibration
  • elastic constants
  • piezoelectric circular plate
  • dielectric constants
  • Abstract Due to the complexity of electro-elastic coupling characteristics in piezoelectric material, some of the elastic, dielectric and piezoelectric parameters are difficult to be measured. Usually, these parameters are determined by assuming that all offer parameters are remained constant during the measurement. However, the interactive effect between material properties makes this assumption be not always true. In this study, the measured natural frequencies of the specified circular piezoelectric plate are used to extract these parameters simultaneously. In other words, all these parameters are determined with considering the interactive electro-elastic coupling effect.
      The analytic model of free-free circular piezoceramic plate was derived and solved to establish the relationship between natural frequencies and its material parameters, to cover most all the parameters, the out-of-plane(non-symmetric transverse) and in-plane(symmetric extensional) modes are considered. The genetic algorithm is employed to determine most all elastic, dielectric and piezoelectric parameters from a least square error between the calculated and measured natural frequencies. Numerical results derived from the parameters proposed in this work reveal a good agreement with the measured data. In other words, the proposed method to extract the piezoelectric parameters is feasible and effective.
    Advisory Committee
  • Ying-chien Tsai - chair
  • Der-min Tsai - co-chair
  • Yung-chuan Chen - co-chair
  • Shyh-chour Huang - co-chair
  • Jao-hwa Kuang - advisor
  • Files
  • etd-0719110-175233.pdf
  • indicate access worldwide
    Date of Submission 2010-07-19

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