Abstract：The torsional vibration characteristics of the rotor of a centrifugal charging pump for 1 000 MW nuclear power plants were calculated by means of Ansys; and the vibration amplitude under different rotational speeds were obtained. The computational geometry model was built by using Pro/E and its mesh was generated in ICEM. The results showed that the stability of the rotor with three supports is better than the rotor with two supports since all the natural frequencies of the former are significantly higher compared with the latter, suggesting the former will help reduce vibration and noise issued from the pump in operation. When the pump is running at the 4 900 r/min rotational speed, a first order torsional resonance takes place quite clearly because the sixth harmonic frequency of the motor driving torque is around an integer multiple of the first order torsional vibration natural frequency of the rotor. The design operating speed of the charging pump is 4 500 r/min; since it is less than every order critical speed of the rotor, a torsional resonance cannot occur. This indicates that the structure design of the rotor shaft is reasonable.
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