Damage Detection through Analysis of Modes in a Partially Constrained Plate
Publication: Journal of Aerospace Engineering
Volume 20, Issue 2
Abstract
The need for aircraft, both military and civilian, to serve longer and cost less to operate is ever present. The ability to potentially extend service life and reduce operating and maintenance costs are key factors in the many choices with aircraft programs. The field of structural health monitoring attempts to reduce labor and cost by allowing technicians to monitor selected properties of an aircraft’s structure to detect impending failure. This research examines methods to detect damage to a thermal protection system tile using representative aluminum plates. Plates are subjected to modal analysis in single and joined conditions in an attempt to provide the capability of sensing damage to a tile on the surface of a vehicle whereas the sensors remain on the substructure of the airframe. Jointly, the development of a means to model the system using finite-element techniques is explored. It is found that the finite-element modeling technique produces correlating modal frequencies within a 7.19% worst case average when compared to the physical tests. This leads to the ability to compare mode shapes and frequencies to detect damage in such a system.
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Acknowledgments
The writers would like to thank Mark Derriso from the Air Force Research Laboratory for his financial support during this project. The views expressed in this work are those of the writers and do not reflect the official policy or position of the U.S. Air Force, the Department of Defense, or the U.S. Government. This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States.
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Copyright
© 2007 ASCE.
History
Received: Mar 22, 2005
Accepted: Aug 9, 2005
Published online: Apr 1, 2007
Published in print: Apr 2007
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