Wednesday, February 25, 1987 1:00 p.m.
R. Lowell Smith
Texas Research Institute, Inc.
For many years the broadly analogous behavior of resonant mechanical structures and electrical circuits has been recognized and exploited. Usually the direction this takes is to allow the methods of electrical network analysis to be brought to bear on mechanical and electromechanical problems. Two-terminal electrical immittance measurements are routinely interpreted in this way to obtain the piezoelectric coefficients of transduction materials and a variety of figures of merit of fully articulated transducers. In spite of competitions from bond graph formalisms and finite element analysis, equivalent circuit modeling remains a powerful tool for modal analysis and the characterization of transduction processes. Lumped and distributed attributes, viscous losses, inertial clamping effects, mode coupling, structural features, electrical tuning, and other (than immittance) measurement scenarios all have very natural equivalent circuit modeling descriptions.