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Structure of a rotor and other design parameters are all viewed as constant using finite element software to analyze reliability of the rotor. In this case,reliability analysis of the rotor can’t be realized for design parameters as random. Based on theory of elastic mechanics,starting with the micro element of the rotor,stress formulas on arbitrary point of turbine disc with equal and variable thickness are deducted under the influence of centrifugal force and temperature field on rotor system simultaneously. Considering the random of structural size of the turbine rotor,temperature stress,rotating speed,external loads and material strength,the reliability of a rotor is studied with stress-strength interference model,integral stochastic finite element method(ISFEM) and Gram-Charlier series method,and random structural reliability of the rotor is computed with higher accuracy.
Structure of a rotor and other design parameters are all viewed as constant using finite element software to analyze reliability of the rotor. In this case, reliability analysis of the rotor can not be realized for design parameters as random. Based on theory of elastic mechanics , with the micro element of the rotor, stress formulas on arbitrary point of turbine disc with equal and variable thickness are deducted under the influence of centrifugal force and temperature field on rotor system. Considering the random of structural size of the turbine rotor, temperature stress, rotating speed, external loads and material strength, the reliability of a rotor is studied with stress-strength interference model, integral stochastic finite element method (ISFEM) and Gram-Charlier series method, and random structural reliability of the rotor is computed with higher accuracy.