Vibration Parameters Estimation by Blade Tip-Timing in Mistuned Bladed Disks in Presence of Close Resonances

• DOI: 10.3390/app10175930
• Publication Date: 2020-08-27T12:05:18Z
• Authors: Saeed Bornassi; Christian Maria F...; Teresa Maria Berruti
• Keywords: Mistuning; Sine

The present paper is focused on the post processing of data coming from Blade Tip-Timing (BTT) sensors in case where two very close peaks are frequency response vibrating system. This type dynamic with can occur quite often bladed disks. It related to fact that disk not perfectly cyclic symmetric and so called “mistuning” present. A method based fitting BTT by means a 2 degrees freedom (2DOF) model proposed. Nonlinear least square optimization technique employed for identification vibration characteristics. numerical test lump parameter assembly used simulate different curves corresponding signals. Frequency Response Function (FRF) constructed at resonance region compared traditional Sine results, frequencies damping values estimated procedure also reported. Accurate predictions achieved results demonstrate considerable capacity 2DOF be as standalone or complement standard method.