Experimental Validation of an Optically Measured Digital Replica of a Geometrically Mistuned Rotor Using a System ID Approach

摘要

This work validates a digital replica of a mistuned rotor created from a point cloud produced from a structured light topological measurement system. The measurement system accurately captures the manufacturing deviations of each airfoil and allows prediction of the mistuned dynamic response of the rotor subject to harmonic excitation. A reverse engineering process is used to first create a nominal finite element model of the point cloud and subsequently transform each airfoil geometry to the measured point cloud. Model results are compared to a traveling wave excitation vibration test that approximates engine harmonic loading using phase shifted magnetic actuators. Uncertainties are assessed in point cloud collection, reverse engineering process, and the experiment. Results show minimal variation in the model predictions and experimental measurements. Comparison between analysis and test show excellent agreement, validating the process to create digital replicas that accurately predict complex dynamic behavior of rotor mistuned response.