Wave propagation in isogrid structures
2011
This work focuses on an analysis of wave propagation in isogrid structures as it
relates to Structural Health Monitoring (SHM) methods. Assembly, integration,
and testing (AI&T) of satellite structures in preparation for launch includes
significant time for testing and reworking any issues that may arise. SHM methods
are being investigated as a means to validate the structure during assembly and
truncate the number of tests needed to qualify the structure for the launch
environment. The most promising of these SHM methods uses an active wave-based
method in which an actuator propagates a Lamb wave through the structure; the
Lamb wave is then received by a sensor and evaluated over time to detect structural
changes. To date this method has proven effective in locating structural defects in a
complex satellite panel; however, the attributes associated with the first wave
arrival change significantly as the wave travels through ribs and joining features.
Previous studies have been conducted in simplified ribbed structures, giving initial
insight into the complex wave propagation phenomena. In this work, the study has
been extended numerically to the isogrid plate case. Wave propagation was
modeled using commercial finite element analysis software. The results of the
analyses offer further insight into the complexities of wave propagation in isogrid
structures.
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