title: Effect of material constants on power output in piezoelectric vibration-based generators.
abstract: A possible power output estimation based on material constants in piezoelectric vibration-based generators is proposed. A modified equivalent circuit model of the generator was built and was validated by the measurement results in the generator fabricated using potassium sodium niobate-based and lead zirconate titanate (PZT) ceramics. Subsequently, generators with the same structure using other PZT-based and bismuth-layered structure ferroelectrics ceramics were fabricated and tested. The power outputs of these generators were expressed as a linear functions of the term composed of electromechanical coupling coefficients k(sys)(2) and mechanical quality factors Q*(m) of the generator. The relationship between device constants (k(sys)(2) and Q*(m)) and material constants (k(31)(2) and Q(m)) was clarified. Estimation of the power output using material constants is demonstrated and the appropriate piezoelectric material for the generator is suggested.
authors.affiliation: Graduate Schools of Science and Engineering, Tokyo Institute of Technology, Tokyo, Japan. htakeda@ceram.titech.ac.jp
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Takeda
authors.forename: Kensuke
authors.initials: K
authors.lastname: Mihara
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Yoshimura
authors.forename: Takuya
authors.initials: T
authors.lastname: Hoshina
authors.forename: Takaaki
authors.initials: T
authors.lastname: Tsurumi