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Ground Vibration Test of the Aerostructure Test Wing 2The Aerostructures Test Wing (ATW) was developed to test unique concepts for flutter prediction and control synthesis. A follow-on to the successful ATW, denoted ATW2, was fabricated as a test bed to validate a variety of instrumentation in flight and to collect data for development of advanced signal processing algorithms for flutter prediction and aviation safety. As a means to estimate flutter speed, a ground vibration test (GVT) was performed. The results of a GVT are typically utilized to update structural dynamics finite element (FE) models used for flutter analysis. In this study, two GVT methodologies were explored to determine which nodes provide the best sensor locations: (i) effective independence and (ii) kinetic energy sorting algorithms. For measurement, ten and twenty sensors were used for three and 10 target test modes. A total of six accelerometer configurations measured frequencies and mode shapes. This included locations used in the original ATW GVT. Moreover, an optical measurement system was used to acquire data without mass effects added by conventional sensors. A considerable frequency shift was observed in comparing the data from the accelerometers to the optical data. The optical data provided robust data for use of the ATW2 finite element model update.
Document ID
20090009755
Acquisition Source
Armstrong Flight Research Center
Document Type
Conference Paper
Authors
Herrera, Claudia
(NASA Dryden Flight Research Center Edwards, CA, United States)
Moholt, Matthew
(NASA Dryden Flight Research Center Edwards, CA, United States)
Date Acquired
August 24, 2013
Publication Date
February 9, 2009
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
DFRC-844
Meeting Information
Meeting: 27th IMAC Conference and Exposition on Structural Dynamics
Location: Orlando, FL
Country: United States
Start Date: February 9, 2009
End Date: February 12, 2009
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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