Wave propagation in isogrid structures

Whitney D. Reynolds; Derek Doyle; Brandon Arritt

doi:10.1117/12.879829

29 March 2011 Wave propagation in isogrid structures

Whitney D. Reynolds, Derek Doyle, Brandon Arritt

Proceedings Volume 7984, Health Monitoring of Structural and Biological Systems 2011; 798402 (2011) https://doi.org/10.1117/12.879829
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

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.

Citation Download Citation

Whitney D. Reynolds, Derek Doyle, and Brandon Arritt "Wave propagation in isogrid structures", Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 798402 (29 March 2011); https://doi.org/10.1117/12.879829

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