Vibratory Response of a Rotating Disk Incorporating Image Derotation Techniques and Holographic Interferometry

This report covers work carried out at AFAPL's Turbo Structures Research Laboratory (TSRL) on the vibratory response of an internally clamped annular disk under both static and rotational conditions. Standard holographic interferometry was used to experimentally determine the frequencies and mode shapes of a 10 inch disk under nonrotating conditions. Incorporating an image derotator and double-pulsed ruby laser, resonant conditions and mode shapes were again determined, but this time the interferograms were constructed while the disk was rotating at specified speeds. The finite element computer program NASTRAN was used to model the steel disk and analytically determine the mode shapes and frequencies as a function of speed. The analytical frequency predictions were compared to the experimental results and found to deviate by about 4%. (Author)