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Accession Number
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ADA566383
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Title
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Embedded Ultrasonics for SHM of Space Applications.
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Publication Date
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Jul 2012
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Media Count
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118p
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Personal Author
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A. N. Zagrai
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Abstract
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The project explores application of embedded ultrasonics for monitoring integrity of space structures. Particular attention is given to the acoustic-elastic method for assessing the condition of bolted joints. The utility of the method is demonstrated for bolted structures of simple and complex geometries. The method allows for locating a loose bolt based on temporal variation of signal phase and, in structures of simple geometry, inferring correlation between torque on a bolt and associated shift in the phase of the elastic wave. A baseline-free acousto-elastic method was developed and validated on several representative structures. The opportunity to infer material parameters and boundary condition variations from embedded ultrasonic tests is highlighted. Acousto-elastic detection of a loose bolt is validated in tests involving the Plug and Play satellite and a suborbital payload. Sensor statistics and shielding are considered. It is advocated that the acousto- elastic structural health monitoring method may find a broad range of applications in space industry, particularly in pre-launch qualification and diagnosis and re-certification for a next flight.
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Keywords
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Acousto-elastic
Artificial satellites
Bolted joints
Embedded ultrasonics
Piezoelectric sensors
Spacecraft
Structural health monitoring
Ultrasonics
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Source Agency
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Non Paid ADAS
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NTIS Subject Category
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41F - Joining
63A - Acoustic Detection
46A - Acoustics
46E - Structural Mechanics
84G - Unmanned Spacecraft
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Corporate Author
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New Mexico Inst. of Mining and Technology, Socorro.
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Document Type
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Technical report
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Title Note
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Final rept. 3 Feb 2009-23 May 2012.
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NTIS Issue Number
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1307
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Contract Number
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FA9453-09-1-0318
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