A Technique to Locate Damage in a Beam Using Non-Resonant Frequency Response Vibration Data
NAVAL ACADEMY ANNAPOLIS MD DIV OF ENGINEERING AND WEAPONS
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This paper investigates a vibrational technique for the non destructive identification of damage in beams. There has been much work investigating the variation of natural frequencies with damage, but much less on the effect of damage on mode shapes. Very little attention has been directed to off-resonant performance. This paper develops a technique for identifying the location of structural damage in a beam using experimental frequency response function data. The procedure specifically has no requirement for knowledge about the undamaged structure. Although the technique is based on modal superposition, a modal analysis of the measured data is not required, and offers no additional information. This work was brought about by the need to locate damage in difficult-to-reach structures such as the underwater part of offshore oil platforms, and space structures such as satellites and the space station.