An off-resonance synchronous vibration based method for rotor system damage detection

This paper presents a methodology for detecting rotor imbalances, such as mass imbalance and crack-induced imbalance, using shaft synchronous vibrations.A vibration detection algorithm is derived based on the first order synchronous vibration response.A detection system was integrated by using state-of-the-art commercial analysis equipment.A laboratory rotor test rig with controlled mass imbalances was used to verify the integrated system.The system was then deployed to an engine subassembly test setup.Four specimens were used in the subassembly test and the test results are reported in the final section.