Modelling and characterization of a piezoceramic inertial actuator

G. A. Lesieutre, R. Rusovici, G. H. Koopmann, J. J. Dosch

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Abstract

An inertial actuator (also known as a proof mass actuator) applies forces to a structure by reacting them against an "external" mass. This approach to actuation may provide some practical benefits in the active control of vibration and structure-borne noise: system reliability may be improved by removing the actuator from a structural load path; effective discrete point-force actuation permits ready attachment to curved surfaces, and an inherent passive vibration absorber effect can reduce power requirements. This paper describes a class of recently developed inertial actuators that is based on mechanical amplification of displacements of an active piezoceramic element. Important actuator characteristics include resonance frequencies, clamped force, and the drive voltage to output the force frequency response function. The paper addresses one particular approach to motion amplification, the "dual unimorph," in detail. A model of actuator dynamic behavior is developed using an assumed-modes method, treating the piezoelectrically induced stresses as external forces. Predicted actuator characteristics agree well with experimental data obtained for a prototype actuator. The validated actuator dynamic model provides a tool for design improvement.

Original languageEnglish (US)
Pages (from-to)93-107
Number of pages15
JournalJournal of Sound and Vibration
Volume261
Issue number1
DOIs
StatePublished - Mar 13 2003

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Acoustics and Ultrasonics
  • Mechanical Engineering

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