| Abstract:A high-fidelity whole engine solid finite element model can realistically reflect the vibration characteristics of the
aeroengine, however, it is difficult to take into account the complex dynamic model rolling element bearing fault, and its computational
workload is too large to handle the whole engine nonlinear dynamic simulation under the excitation of main bearing spalling faults. In order
to effectively diagnose main bearing faults, it is crucial to study the vibration response mechanism of the whole engine under the excitation
of main bearing spalling faults. A hybrid simulation analysis method of main bearing fault dynamics based on solid finite element model
and beam element finite element model was proposed. The support reaction forces of the main bearing connected to the casing were
obtained by the simulation analysis of the whole engine beam element model, then, the rotor solid finite element model was removed from
the whole engine solid finite element model, and the support reaction forces were directly applied to the bearing housing at each support,
and the transient response analysis method was used to obtain the whole engine vibration response under the excitation of main bearing
faults. Finally, the method was verified using the whole engine beam element model. The results show that the simulation signal under the
excitation of main bearing faults can be obtained by using the hybrid finite element simulation method, with errors less than 1%, indicating
the correctness and effectiveness of the proposed method. |
