Dynamic characteristics of the national full-scale aerodynamic complex drive fan bladesAn extensive experimental test program was conducted to define the dynamic characteristics of the newly installed fan blades of the NASA Ames 40- by 80-/80- by 120-Foot Wind Tunnel. The tests were intended to substantiate the blade design and manufacturing process, verify installation integrity, and guarantee safe fan-drive operation. The program included a shake test of each fan blade after installation and before operation as well as the monitoring of blade strain levels during initial operation. Structural characteristics, as determined by the shake test, include the modal frequency and damping values for elastic bending and torsion modes between 5 and 130 Hz. Operational testing defined the maximum and oscillatory blade-bending strains throughout the drive-system operational envelope. Results are presented for the shake test and initial operation of the 40- by 80-Foot Wind Tunnel circuit.
Document ID
19870052369
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Peterson, Randall L. (NASA Ames Research Center Moffett Field, CA, United States)
Graham, Todd (NASA Ames Research Center Moffett Field, CA, United States)
Lau, Benton (NASA Ames Research Center Moffett Field, CA, United States)