A Finite Element Accurate Modeling Method for Large Turbine Generator Stator Bars

A technology for turbogenerators and stator bars, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of inconsistent structure of actual bars, time-consuming and laborious modification, easy confusion of models, etc., to achieve omission 3D solid modeling, easy loading, and reduced modeling workload

Active Publication Date: 2018-01-02
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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  • A Finite Element Accurate Modeling Method for Large Turbine Generator Stator Bars
  • A Finite Element Accurate Modeling Method for Large Turbine Generator Stator Bars
  • A Finite Element Accurate Modeling Method for Large Turbine Generator Stator Bars

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Embodiment

[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 accurate modeling method for a stator bar of a large turbogenerator, wherein the steps of the method are as follows: Step 1: Obtain a two-dimensional model of the bar axis according to the size requirements of the drawing; Step 2 : Use the conical envelope method to establish a three-dimensional geometric model of the wire rod axis; Step 3: Divide the section into many small rectangles according to the position of each material in the wire rod and the geometric shape of each layer structure, so that the direction of the section is centered; Step 4: After the section with the correct direction is generated at each key point on the three-dimensional space curve, the corresponding nodes on the adjacent sections are connected in turn to generate hexahedral elements to form a complete three-dimensional finite element model of wire rod. The invention proposes a three-dimensional finite element modeling method for wire rods based on finite element software and conical envelope algorithm, which omits three-dimensional solid modeling and simplifies analysis steps; provides an efficient and accurate three-dimensional method for large-scale turbogenerator stator wire rods Finite Element Modeling Method.

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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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