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Proceedings Paper

Effect of material loss on energy transfer in a laminated beam actuated by a piezoceramic layer
Author(s): Kai D. Wolf; B. Ravindra
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Paper Abstract

The electromechanical coupling factor (EMCF) defined as the ratio of convertible electric energy to the total energy stored in a electroelastic structure is a good measure to evaluate the performance of PZT transducers. The concept of the EMCF can be utilized to optimize the design of actuators. Piezoelectric material properties are temperature dependent and the actuators must not reach the Curie temperature. The need for optimization of these devices results from nonideal behavior i.e. losses, saturation effects and other nonlinearities. In high power applications, where material losses can lead to excessive heat production, different loss mechanisms should be carefully considered to find the optimal design. A total loss factor, analogous to the concept of the EMCF, can be determined, which relates the dissipated energy to the energy stored in an electromechanical system for a given steady-state cycle of deformation. A periodic laminated beam model is considered to investigate the loss factor dependence on the thickness of the piezoceramic layer. Using the Bernoulli-Euler assumption for the electromechanical variables, the state equations of a planar laminated beam are derived. Different losses are determined by employing the complex material constants. The influence of different loss mechanisms on the total dissipated energy is investigated.

Paper Details

Date Published: 24 July 1998
PDF: 8 pages
Proc. SPIE 3323, Smart Structures and Materials 1998: Mathematics and Control in Smart Structures, (24 July 1998); doi: 10.1117/12.316319
Show Author Affiliations
Kai D. Wolf, Darmstadt Univ. of Technology (Israel)
B. Ravindra, Darmstadt Univ. of Technology (Germany)

Published in SPIE Proceedings Vol. 3323:
Smart Structures and Materials 1998: Mathematics and Control in Smart Structures
Vasundara V. Varadan, Editor(s)

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