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A.
Mal, F. Ricci, S. Banerjee, F. Shih, 2005, “A
Conceptual Structural Health Monitoring System Based
on Wave Propagation and Modal Data,” Structural
Health Monitoring, 4, 283-293
A Conceptual Structural Health
Monitoring System based on
Vibration and Wave Propagation
ABSTRACT
Development
of efficient methodologies to determine the presence,
location, and severity of hidden damage in critical
structural components is an important task in the
design and construction of structural health monitoring
systems in aging as well as new structures. In this
article, a methodology for automatic damage identification
and localization is presented. The structure is assumed
to be instrumented with an array of actuators and
sensors to excite and record its dynamic response,
including vibration and wave propagation effects.
In the vibrational approach, the data consist of the
modal response of the structure produced by the actuators
while in the wave propagation approach, they are the
broadband signals due to ultrasonic waves propagating
in the structures. Both types of signals are affected
by the presence of defects. The approximate location
and severity of an unknown defect is determined using
a damage correlation index calculated from the frequency
response function (FRF) of the structure. The damage
index is a relative measure whose value depends on
the differences in the dynamical properties of the
undamaged (baseline) and damaged structures. The method
is applied to simple structural components involving
aluminum beams and plates with reduced local stiffness
and a composite plate with impact damage. The potential
application of the technique to practical health monitoring
problems is discussed.
(Article
in PDF, SAGE Publications)
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