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The centrifugal force balance machine can be divided into the soft support and the hard bearing balancing machine. The balancing speed is higher than the natural frequency of the rotor bearing system. The support stiffness of the balancing machine is small, and the signal of the sensor is proportional to the vibration displacement of the support. The balance rotation speed is lower than the natural frequency of the rotor support system, which is a hard bearing balancing machine. The support stiffness of the balancing machine is large, and the signal of the sensor is proportional to the vibration force of the support.