The finite element model of dual rotor-supporting system was constructed.Based on the finite element model

vibration signal under the faults of mass unbalance and local shaft bow was simulated.A model-based method was developed to identify the fault in the dual rotor-supporting system.1-fault search method

2-fault search method and 3-fault search method were utilized to identify the fault efficiently and accurately.The validation results show that the method could identify single fault and multi-concurrent faults accurately and confirm the fault location

severity and phase simultaneously.This method optimizes fault search process

which is used to decreases 98.9% calculation amount in the ideal situation

and accelerates fault identification.Besides

if comparing with the identification results by adding different adding noises

the relative error is around 1% which validates good robustness to noise.