Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-07-26
2005-07-26
Williams, Hezron (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S602000, C073S644000
Reexamination Certificate
active
06920790
ABSTRACT:
A method and apparatus for determining stiffness of a plate-like structure including a monolithic or composite laminate plate entails disposing a device for generating an acoustical pulse against a surface of the plate and disposing a detecting device against the same surface spaced a known distance from the pulse-generating device, and using the pulse-generating device to emit a pulse so as to create an extensional wave in the plate. The detecting device is used to determine a time of flight of the wave over the known distance, and the wave velocity is calculated. A Young's modulus of the plate is determined by a processor based on the wave velocity. Methods and apparatus for evaluating both isotropic plates and anisotropic laminates are disclosed.
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DeLangis Leo M.
Huang Jerry Qixin
Perez Robert J.
Saint-Surin Jacques M.
The Boeing Company
Williams Hezron
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