Online monitoring bearing load was presented to exposit the bearing load character of rotor-bearing system.The lateral vibration model of the rotor system was established with considering the bearing load.By simulation and experimental research

the coupling relationship between the bearing load and vibration of support was studied.The method detected the bearing load by installing a sensor under the bearing chock

and the acceleration of support was monitored simultaneously.The load signal detected was substituted into the model of vibration to simulate the acceleration.Results show that

the detected acceleration and the simulated one have the same peak cyclic period

the vibration of support is superimposed by the forced vibration aroused by bearing load and the other vibration signals

and its characters are affected by bearing load.So change of bearing load can be as an important condition of state estimation of the rotor system.