Method for acquiring dynamic balance coefficient of rotor

A method for acquiring a dynamic balance coefficient of a rotor belongs to the technical field of a rotor of a rotary machine. The invention aims to provide the method for acquiring the dynamic balance coefficient of the rotor, by which the balance weight of rotary machines of the same type can be obtained by simple calculation. The method comprises the following steps of: measuring amplitude and phase angle generated by original unbalanced weight; trying to add weight, and then starting the rotor to measure amplitude and phase angle; acquiring an amplitude and phase angle independently generated by weight adding by vector triangle calculation; calculating out amplitude phase influence coefficient according to the data, so as to obtain the dynamic balance coefficient. The method is applicable for the measuring of dynamic balance of the rotors of all rotary machines. The method is characterized in that the unbalanced weights and positions of the rotors of the same type can be calculated by the coefficient calculation method after the dynamic balance of the rotors of one type is found. The dynamic balance acquiring of the rotary machines of the same type is simple, fast and safe; by the coefficient calculation method, the operation steps of dynamic balance acquiring of the rotors of the same type can be simplified.