Randall L. Peterson and Muhammed S. Hoque, "Dynamic Response of NASA Rotor Test Apparatus and Sikorsky S-76 Hub Mounted in the 80- by 120-Foot Wind Tunnel," NASA TM-108847, September 1994, pp. 38.

Keywords: Modal analysis, Structural response, Dynamics

Abstract: A shake test was conducted in the 80- by 120-Foot Wind Tunnel at NASA Ames Research Center, using the NASA Ames Rotor Test Apparatus (RTA) and the Sikorsky S-76 rotor hub. The primary objective of this shake test was to determine the modal properties of the RTA, the S-76 rotor hub and the model support system installed in the Wind Tunnel. Random excitation was applied at the rotor hub, and vibration responses were measured using accelerometers mounted at various critical locations on the model and the model support system. Transfer functions were computed using the load cell data and the accelerometer responses. The transfer function data were used to compute the system modal parameters with the aid of modal analysis software.

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