Dynamic characteristic evaluation system and method for partitioned fixed balancing weight in narrow space

Abstract

The invention discloses a dynamic characteristic evaluation system for a partitioned fixed balancing weight in a narrow space. The dynamic characteristic evaluation system comprises a three-dimensional modeling unit, a finite element mechanical test analysis unit and a post-processing path mapping unit, the three-dimensional modeling unit is responsible for establishing a three-dimensional geometric model of the balancing weight and the weld joint; for a narrow space with vertical ribs, the balancing weights need to be fixed in a blocking mode, and the characteristics of material deformation and stress concentration of centrifugal force are reduced; the finite element mechanical analysis unit is used for importing the established model into finite element analysis software, modeling a balancing weight and a welding seam, dividing grids, giving boundary conditions, debugging and calculating; and the post-processing path mapping unit is used for analyzing the overall stress deformation of the balancing weight and the deformation of the weld joint, and calculating the dangerous section by adopting a path marking method. Defects can be found in advance, precision is high, and evaluation is accurate.

Description

technical field [0001] The invention relates to the technical field of hydraulic machinery dynamic balance, in particular to a dynamic characteristic evaluation system and method for dividing and fixing counterweights in a narrow space. Background technique [0002] Due to the limitations of process control, hydroelectric generator sets are prone to mass eccentricity and electromagnetic eccentricity. The radial centrifugal force generated by the rotation will directly act on the guide bearing, which will cause changes in operating parameters during the change of working conditions. Therefore, in order to ensure that the vibration and swing parameters of the machine are within a reasonable range within the operating speed range, it is necessary to add counterweights to the rotor bracket at a specific position according to the rotor rotation parameters to balance the dynamic unbalanced component. [0003] At present, the method of adding counterweight to the guide bearing bra...

AI Technical Summary

Problems solved by technology

In the past, most of the fixing methods for counterweights relied on experience. This method has the following disadvantages: First, because most of the welding methods rely on workers' experience and lack of scientific guiding process methods, the danger points of stress concentration and the greatest risk of displacement Second, there is a lack of a dynamic evaluation method for the welding mass, and a lack of analysis methods for the dynamic failure characteristics of the welding block; third, it is impossible to weld and reinforce the entire end face in a narrow space, which is It is necessary to use a reasonable method to systematically calculate the installation form of the counterweight

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