A rotor structure optimization method based on central composite design

Abstract

The invention discloses a rotor structure optimization method based on central composite design, which comprises the following steps: 1, determining design variables of the rotor structure optimization, and determining the range and constraint conditions of the design variables; 2. The central composite design model is used to generate N groups of design variables, and the parameterized finite element method is used to compute the N groups of samples, and the maximum equivalent stress value corresponding to the N groups of samples is obtained as the objective function. 3. The least square method is used to fit the second-order polynomial regression model of the design variable and the objective function. 4. The fitting regression model is optimized, the initial point, initial step, acceleration coefficient, shrinkage coefficient and precision are given, the constraint conditions are set, and the axial detection movement and mode movement mode are judged by voting until the convergencecondition is satisfied, and the optimization of rotor structure is completed. The invention can quickly and accurately solve the problem of rotor structure optimization.

Description

technical field [0001] The invention belongs to the technical field of steam turbine rotors, in particular to a rotor structure optimization method based on central composite design. Background technique [0002] With the widespread use of high-parameter and large-capacity thermal power units, the safety and reliability of steam turbine units have become increasingly prominent. For the steam turbine rotor, which has been in the harsh environment of high temperature and high pressure, it bears the joint action of various loads such as centrifugal force, air flow force, and alternating thermal stress. The sudden change of shape on the rotor, such as rounded corners, shoulders, and grooves, will generate greater thermal stress concentration. The thermal stress at these positions may exceed the yield limit of the material at the corresponding temperature, resulting in greater plastic deformation. After a certain The cycle of alternating thermal stress cycles will produce fatigu...

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Problems solved by technology

This optimization method has the advantage of high accuracy of optimization results, but due to the huge number of finite element meshes in the thermal-structural coupling analysis model, the optimization process requires a lot of time and computer resources

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