Research on identifying synchronous blade vibration using two-parameter-plot method

Based on vibration measuring principle of blade tip-timing(BTT),theoretical derivation is carried out to the two-parameter-plot method.Synchronous blade vibration is identified only by two blade tip timing probes.Analysis model of synchronous blade vibration is setup and simulated.Experiments of certain model of aerial equipments have completed successfully the blade vibration measuring system,which is designed independently.The data of the experiments is analyzed by using this method.The parameters include amplitude,natural frequency and engine order of the blade vibration are identified correctly.The result is accord with the theoretical derivation.