Session: 28-02 System Response / Blade-Tip-Timing

Paper Number: 125535

125535 - Forced Response of Rotating Blisks: Prediction and Correlation to Blade Tip-Timing Measurements 

Blade geometric variances generally have a significant impact on the structural dynamics of integrally bladed disks widely used in the advanced aero-engines. This paper presents a comprehensive study on the dynamic modelling and resonant vibration prediction of rotating blisks. Forced response tests of a simplified blisk structure are carried out in a spinning rig under the well-controlled laboratory condition. The Blade Tip-Timing technique is employed to give deep insights into the resonant vibration of the rotating blisk. The engine-order excitation is produced by a set of magnetic units and the non-contact force is measured to provide excitation  for the resonant vibration prediction.

Two different blisk dynamic models, namely, the Model-BDTID and GMM, are explored for resonant vibration predictions of the rotating blisk, respectively. The former represents a mistuned blisk model with blade mistuning pattern experimentally retrieved by the recently proposed blade mistuning identification method based on blade detuning tests (BDTID). It falls into the scope of the frequency-mistuning modeling approach. The latter refers to a geometrically mistuned model constructed upon high-precision blisk geometry measurement data by leveraging the advanced optical geometry measurement technology.

Benefitting from the all-blade vibration measurement by BTT, prediction capability of the two blisk dynamic models in terms of forced response variation of the rotating blisk are fully assessed.

Presenting Author: Biao Zhou Nanjing University of Aeronautics and Astronautics

Presenting Author Biography: Biao Zhou is an associate professor in structural dynamics from Nanjing University of Aeronautics and Astronautics, China. He had been awarded a Marie Skłodowska-Curie Individual Fellowship, working in cooperation with Prof. Teresa Berruti from Politecnico di Torino, Italy (May, 2021 ~ April, 2023). He holds a PhD’s degree at Ecole Centrale de Lyon, France (2009-2013).

Authors:

Biao Zhou Nanjing University of Aeronautics and Astronautics
Chengyu Xie Nanjing University of Aeronautics and Astronautics
Giuseppe Battiato Politecnico di Torino
Teresa Berruti Politecnico di Torino