Publication Date:
2019-07-13
Description:
Twice during the spring of 1978, the two steel-plate "flex-walls" that form the variable-geometry nozzle of the 11- by 11-ft transonic wind tunnel at Ames Research Center experienced a severe dynamic instability. Both walls fluttered in the fundamental beam-bending mode and experienced stresses approaching the yield strength of the material. Both flutter incidents occurred at Mach numbers of about 1.15. The tunnel, operational for 24 years, had no history of such an instability. The cause of these flutter incidents, the steps taken to prevent a recurrence, and the requalification of the facility are described.
Keywords:
Research and Support Facilities (Air)
Type:
AIAA Paper 79-0797
,
Journal of Aircraft; 17; 7; 521-527|Structures, Structural Dynamics, and Materials; Apr 04, 1979 - Apr 06, 1979; Saint Louis, MO; United States
Format:
text
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