Method for performing a ground vibration test in airplanes

Details Method for performing a ground vibration test in airplanes Method for performing a ground vibration test in airplanes

2008-04-22

2010-12-28

Williams, Hezron (Department: 2856)

Measuring and testing

Vibration

Vibrator

Reexamination Certificate

active

07856884

ABSTRACT:
The invention relates to an improved method for a ground vibration test (so-called “ground vibration test”) on an airplane. In the method according to the invention, the airplane is jacked up essentially undamped (“rigidly”) in conventional holding points with lifting devices. For purposes of the ground vibration test, the airplane is then excited to vibrate in a known manner using a plurality of vibration exciters, and the vibrations are acquired with a plurality of measuring transducers, in particular accelerometers. A dynamic vibration model of the airplane theoretically calculated beforehand can here be adjusted. The boundary conditions are removed during or after the ground vibration test, meaning the influence of the lifting device is “mathematically canceled out”, so that the determined measured values reflect the so-called “free-free” state of the airplane, as if the airplane had actually been in free flight during the ground vibration tests.

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Fullenkrug, U., Gloth G., Degener M., Lubrina P., “Ground Vibration Test on the Airbus A380-800” Foiliensatz zur: Aerospace Testing Expo 2005 Conferences. http://www.ukintpress-conferences.com/conf/aero05/open tech html.
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Office Action for Patent Application 102007019402.3-51 (and relevancy statement).

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