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Finite element precise modeling method for stator bar of large turbine generator

A steam turbine generator and stator wire rod technology, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of inconsistency of the actual wire rod structure, time-consuming and laborious modification, and easy confusion of models. 3D solid modeling, easy loading, and the effect of reducing modeling workload

Active Publication Date: 2014-02-12
SHANGHAI ELECTRICGROUP CORP
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Problems solved by technology

[0004] In view of this, the present invention proposes a finite element accurate modeling method for the stator bar of a large turbogenerator to solve the above-mentioned difficulties in analysis and modeling, the modification is time-consuming and laborious, and it is easy to be confused when building the model, which does not match the actual bar structure The problem

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  • Finite element precise modeling method for stator bar of large turbine generator
  • Finite element precise modeling method for stator bar of large turbine generator
  • Finite element precise modeling method for stator bar of large turbine generator

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[0028] See Figure 1-10 As shown, a finite element accurate modeling method of a large turbogenerator stator bar is characterized in that the steps of the method are:

[0029] Step 1: According to the size requirements of the drawing, establish a conic curve plane expansion diagram, and obtain the basic parameters: base circle radius R a , the starting radius R of the starting arc A , starting and ending arc radius r 1 、r 2 , the central angle φ corresponding to the starting point of the involute, and the span angle γ of the expansion line; at the same time, the plane expansion curve is discretized into a series of points and their coordinates are saved (such as Figure 5 shown), and then generate the corresponding key points in the finite element software ANSYS; then use the spline command to connect the above key points, and establish the conic involute, transitional arc and end straight segment of the line bar axis to obtain the line bar A two-dimensional model of the a...

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Abstract

The invention discloses a finite element precise modeling method for a stator bar of a large turbine generator. The method includes the following steps: 1) obtaining a two-dimensional model of the bar axis according to the dimension requirements of a drawing; 2) building a three-dimensional geometrical model of the bar axis by using the cone enveloping method; 3) dividing the section into a plurality of small rectangles according to the location of each material in the bar and the geometrical shape of each layer structure, and centering the section direction; 4) after a section in the accurate direction is generated at each key point of a space three-dimensional curve, connecting in sequence the corresponding nodes on adjacent sections and generating a hexahedral element, so as to form a complete three-dimensional finite element model of the bar. The three-dimensional finite element modeling method for the bar is based on finite element software and the cone enveloping algorithm, so as to dispense with three-dimensional solid modeling and simplify the analysis steps; the three-dimensional finite element modeling method for the stator bar of the large turbine generator provided by the invention has the advantages of high efficiency and precision.

Description

technical field [0001] The invention relates to the technical field of a modeling method, in particular to a finite element accurate modeling method for a stator bar of a large turbogenerator. Background technique [0002] Turbogenerators play an important role in the supply of modern electric energy. With the development of turbogenerators in the direction of large capacity and high power, large currents and magnetic fields will be generated inside them. The structure of the stator end is loose, and the vibration is aggravated. Therefore, it is necessary to carry out modal, electromagnetic and other vibration analysis on the end structure of the turbogenerator, and propose methods to prevent and solve the vibration problem at the end of the generator. In finite element analysis, the model of the object to be analyzed should be obtained first. For turbogenerators, the stator end structure is complex, especially the stator bar winding, which has a basket structure, and the ...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张青雷郭井宽陈吉杜跃斐赵清龙亚文桂士弘
Owner SHANGHAI ELECTRICGROUP CORP
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