An optimization method for controlling the vibration of combined cycle unit by adjusting the bearing elevation

Abstract

The invention discloses an optimization method for controlling vibration of a combined cycle unit by adjusting the bearing elevation. The method comprises the steps that 1, substructure partitioning is conducted; 2, coefficients after the bearing elevation changes are solved; 3, a motion equation at any revolving speed is determined and established according to a fast system matrix algorithm; 4, degree-of-freedom reduction is conducted according to a fixed interface modal synthesis method; 5, system synthesis is conducted, and a motion equation after reduction is established; 6, steady-state response solution is conducted on a reduction system; 7, an optimization model is built; and 8, an optimization model is solved by adopting a genetic algorithm. According to the optimization method, the fast system matrix algorithm at any revolving speed is developed, bearing parameters are calculated by adopting a difference model, degree-of-freedom reduction is conducted according to the modal synthesis method, the requirement on computer resources is reduced, the solution speed is increased, and the optimization model is solved by adopting the genetic algorithm finally. The optimization method has the advantages of being high in calculation speed, saving calculation resources and the like.

Description

technical field [0001] The invention belongs to the numerical simulation technical field of a turbomachinery rotor bearing system, and in particular relates to an optimization method for controlling the vibration of a combined cycle unit by adjusting the bearing elevation. Background technique [0002] In the gas-steam combined cycle heating unit, in order to maximize the heat supply of the unit, the SSS clutch technology can be used and placed between the medium pressure rotor and the low pressure rotor. By controlling the engagement and disengagement of the SSS clutch, the unit can be switched between the condensate heating condition and the pressure heating condition. The separation of the SSS clutch corresponds to the condensate heating condition and the back pressure heating condition, and the engagement Correspondingly, the back pressure heating condition is converted to the condensate heating condition. Theoretical analysis and experimental research show that the exi...

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Problems solved by technology

Due to the existence of nonlinear bearing oil film force, the traditional calculation method of shafting cannot simulate the influence of bearing elevation on the vibration characteristics of shafting

In addition, due to the existence of the asymmetrical motor rotor, the finite element method must establish a three-dimensional machine model. At the same time, in order to study the response at multiple speeds under different bearing elevations, a large number of calculations are required to obtain the influence of the bearing elevation on the unit. , such repeated calculations will increase the demand for calculation time and computer resources

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