Reliability Design of Turbine Rotors
Shi Jinyuan  Sun Qing  Cheng Daolai
(Shanghai Power Equipment Research Institute Shanghai 200240)
Yuan Boyin  Li Ying
(East China Electric Power Test & Research Institute Shanghai 200437)

Abstract: A reliability design method of turbine rotors is presented. It is based on conventional strength and vibration design for rotors, but all the static stress, the  material static strength, the alternating stress, the dimension correction factor, the surface quality correction factor, the stress concentratin correction factor, the material fatigue limit, the creep life, the accumulation of thermal fatigue damage, the low cycle fatigue strength for material, the natural frequency, the excitation force frequency and the unbalance vibration response of the rotors are considered as random variables. A reliability for the rotor design is determined by means of probabilistic mechanical design. Reliability calculation methods for static strength, fatigue strength, thermal fatigue, creep life, distancing from resonance of bending and torsional vibration as well as limiting unbalance response of turbine rotors are given together with some practical examples.
Keywords: steam turbine, gas turbine, rotor, strength, vibration, reliability.