Asymptotic Description of Damping Mistuning Effects on the Forced Response of Turbomachinery Bladed Disks.

摘要

This is the final report of the research grant FA8655-11-1-3084 issued by the European Office of Aerospace Research and Development. This research effort is devoted to the analysis of the effect of damping mistuning on the forced response of turbomachinery bladed disks using asymptotic techniques. In particular it includes: (i) the derivation of the simplified Asymptotic Mistuning Model (AMM) for the general problem of the forced response of a bladed disk with damping mistuning, starting from the full general FE model description of the vibration of the rotor, (ii) the analysis of the most frequent situations of forcing (iia) isolated, disk dominated modes and (iib) clustered, blade dominated modes, and (iii) the checking of the AMM predictions against the results form a 1 DOF per sector mass-spring system, and the computation, for both forcing cases, of the damping mistuning pattern that produces the maximum amplification of the vibration.