First, the presentation will deal with fundamental aspects of mistuned bladed disk vibration. Next, the development of an accurate reduced-order model of a bladed rotor with geometric mistuning will be presented. This technique is being called Modified Modal Domain Analysis (MMDA), which utilizes proper orthogonal decomposition (POD) of Coordinate Measurement Machine (CMM) data on blades’ geometries, and sector analyses using ANSYS and solid modeling. Numerical results will be presented and compared to those from full 360 degree bladed rotor modeling in ANSYS. It will be shown that MMDA provides accurate estimates of natural frequencies, mode shapes and forced response.

Next, novel algorithms for estimating forcing function, mistuning and modal damping will be presented. The approach is based on Unscented Kalman Filter and augmented state space model to include unknown parameters. The approach to represent the unknown forcing function in the state space model will be presented. Requirements on the nature of measured vibration data for simultaneous estimation of forcing function, mistuning and damping will be discussed.