Accession Number : ADA580525


Title :   Dynamics-based Nondestructive Structural Monitoring Techniques


Descriptive Note : Final rept. 27 Oct 2011-27 Oct 2012


Corporate Author : FBS INC STATE COLLEGE PA


Personal Author(s) : Avioli, Michael J ; Yan, Fei


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a580525.pdf


Report Date : 21 Jun 2012


Pagination or Media Count : 184


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.


Descriptors :   *NONDESTRUCTIVE TESTING , STRESS WAVES , STRUCTURAL HEALTH MONITORING , ULTRASONICS , VIBRATION


Subject Categories : Test Facilities, Equipment and Methods
      Acoustics
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE