Constrained Layer Damping and Piezoceramic Active Control

Abstract

The work described in this paper is concerned with controlling the strain of the constraining layer of a composite structure in such a way as to enhance the shear generated in the viscoelastic material and hence improve the overall damping of the composite structure. The results have indicated that this concept of active damping produces very effective levels of vibration suppression. In the case of cantilever beams the vibration levels in the first two modes can be almost eliminated when velocity feedback of the beam tip is used. The results show that the addition of active control and passive damping in a single structure combines the advantages of passive damping in the higher modes and active control in the lower modes. In addition active damping as defined in this paper produces a fail-safe mechanism in case of instability occurring in the feedback loop since a considerable level of passive damping is always present.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1997
Accession Number
ADA380157

Entities

People

  • Geoffrey R. Tomlinson

Organizations

  • University of Sheffield

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors
  • Space

DTIC Thesaurus Topics

  • Air Force
  • Amplifiers
  • Composite Materials
  • Computational Science
  • Control Systems
  • Elastic Properties
  • Finite Element Analysis
  • Frequency
  • Materials
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Piezoceramics
  • Piezoelectric Materials
  • Piezoelectric Polymers
  • Resonant Frequency
  • Shear Modulus

Fields of Study

  • Engineering

Readers

  • Acoustics.
  • Control Systems Engineering.
  • Reinforced Composite Materials