The Fundamental Mistuning Model (FMM) is a reduced-order model for efficiently calculating the forced response of a mistuned bladed disk. FMM ID is a companion program that determines the mistuning in a particular rotor. Together, these methods provide a way to acquire mistuning data in a population of bladed disks and then simulate the forced response of the fleet.
This process was tested experimentally at the NASA Glenn Research Center, and the simulated results were compared with laboratory measurements of a “fleet” of test rotors. The method was shown to work quite well. It was found that the accuracy of the results depends on two factors: (1) the quality of the statistical model used to characterize mistuning and (2) how sensitive the system is to errors in the statistical modeling.
Comparison between the cumulative distribution function of simulated blade amplitudes and laboratory measurements.
Glenn contact: Dr. Shantaram S. Pai, 216-433-3255, Shantaram.S.Pai@nasa.gov
Carnegie Mellon University contact: Dr. Jerry H. Griffin, 412-268-3860, jg9h@andreqw.cmu.edu
Author: Dr. Jerry H. Griffin
Headquarters program office: OAT
Programs/Projects: Ultra Safe, UEET
Last updated: July 21, 2005 10:49 AM
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