Dynamics-based Nondestructive Structural Monitoring Techniques

Abstract

A novel Ultrasonic Modal Analysis Technique (UMAT) capable of damage detection in 3-dimensional, non-homogeneous, anisotropic structures based on ultrasonic vibration signatures was developed and implemented into a portable inspection system. The system contains an annular array actuator that is capable of providing various guided wave modes and frequencies as the loading functions to achieve high sensitivity to different defects. An analytical theory on guided wave excitations by annular arrays with/without time delays was developed. The theory can be applied for optimizing annular array designs for UMAT and also conventional transient ultrasonic guided wave applications.

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Document Details

Document Type
Technical Report
Publication Date
Jun 21, 2012
Accession Number
ADA580525

Entities

People

  • Fei Yan
  • Michael J. Avioli

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Composite Materials
  • Computer Programs
  • Damage Detection
  • Finite Element Analysis
  • Laminates
  • Mechanics
  • Modal Analysis
  • Modulus Of Elasticity
  • Pattern Recognition
  • Resonant Frequency
  • Standing Waves
  • Structural Health Monitoring
  • Three Dimensional
  • Transducers
  • Two Dimensional
  • Wave Propagation
  • Waveforms

Fields of Study

  • Physics

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Pulsed Power and Plasma Physics.
  • Structural Health Monitoring of Composite Structures.