Mistuning identification of blisk based on antiresonance

Differences between blades in aero-engine blisks, known as mistuning, can lead to vibration localization and amplified dynamic response, ultimately resulting in high-cycle fatigue failure. Accurate mistuning identification is essential for predicting such vibration amplification but remains challenging due to blade-disc coupling effects in conventional resonance-based methods. Most existing identification methods rely on resonance measurements, yet they cannot fully eliminate the influence of blade-disc coupling. In this work, we propose a novel antiresonance-based mistuning identification method that leverages cyclic-metamaterial wave phenomena: by treating each blade as a local resonator, its blade-alone frequency is revealed as an antiresonance. A Measurement Point Correction strategy is introduced to ensure that the antiresonant frequencies approximate the blade-alone frequencies, thereby eliminating blade-disc coupling errors. The method incorporates a detuning strategy to isolate individual sector responses, enabling accurate blade-by-blade mistuning extraction. Validated both numerically (on a Rotor37 model) and experimentally (on a 12 blades dummy blisk), the approach achieves response amplification prediction errors below 1%. The proposed method is particularly effective for lightweight blisks with strong blade-disc coupling.