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Self-adaptive degree-of-freedom electromagnetic-temperature multi-physical field coupling analysis method

A multi-physics, coupled analysis technology, applied in special data processing applications, complex mathematical operations, computer-aided design, etc., can solve the problems of mapping function selection, large mapping errors, etc.

Active Publication Date: 2021-02-09
SHANGHAI UNIV
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  • Application Information

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Problems solved by technology

The electromagnetic-temperature multi-physics field weak coupling analysis method based on the independent numerical solution of the physical field is the main research and development direction at present. The mapping program realizes the transfer of coupling quantities between physical fields. However, the traditional weak coupling analysis method has problems such as the selection of mapping functions and large mapping errors.

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  • Self-adaptive degree-of-freedom electromagnetic-temperature multi-physical field coupling analysis method
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  • Self-adaptive degree-of-freedom electromagnetic-temperature multi-physical field coupling analysis method

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Embodiment 1

[0065] On the basis of considering the discretization requirements difference between the electromagnetic field and the temperature field, the present invention proposes an adaptive degree-of-freedom finite element method for the weak coupling analysis of the electromagnetic-temperature multi-physics field based on the unstructured grid, on a set of grids Realize the independent and flexible adjustment of the two degrees of freedom of the physical field, meet the different requirements of the physical field for discreteness with smaller computing resources, and avoid the use of grid mapping functions and the errors that may be introduced; in this invention, the increase of the degree of freedom Realized by mesh refinement and synchronized after the two physics meshes are independently refined; the removal of degrees of freedom is only realized in the finite element space by master-slave technology, and resumed after the solution is completed, thereby avoiding the actual mesh Sp...

Embodiment 2

[0143] refer to Figure 3-6 , is another embodiment of the present invention. In order to verify and explain the technical effect adopted in this method, this embodiment uses the traditional weak coupling analysis method to conduct a comparative test with the method of the present invention, and compares the calculation results by means of scientific demonstration to verify The real effect of this method.

[0144] This embodiment is a transient electromagnetic-temperature coupling problem. The adaptive degree of freedom finite element step calculation is calculated with a time step of 0.5ms to the time node 25ms. During the adaptive calculation process, a grid with 467202 elements is generated. And about 17% of the magnetic field degrees of freedom and 29% of the thermal field degrees of freedom are moved out of the finite element space in each calculation step, such as Figure 4~6 As shown, the Z-direction component of the magnetic flux density obtained at the time node 25ms...

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Abstract

The invention discloses a self-adaptive degree-of-freedom electromagnetic temperature multi-physical field coupling analysis method. The method comprises the steps of establishing an electrical equipment geometric model and initial unstructured grid discretization; establishing an electromagnetic temperature multi-physical field weak coupling numerical model; analyzing finite element calculation format derivation based on an electromagnetic temperature multi-physical-field weak coupling numerical model of an unstructured grid unit; calculating and solving an electromagnetic temperature multi-physical field in the electrician equipment, and carrying out error analysis on a numerical solution; and adjusting the degree of freedom of each physical field, and solving again according to the adjustment result until the precision of the numerical solution meets the requirement to finish analysis. According to the method, independent and flexible adjustment of the freedom degrees of two physical fields is achieved on one set of grids, different requirements of the physical fields for discretization are met with small computing resources, grid sparsity and subsequent complex operation of actual operation are avoided, a grid mapping function and errors possibly introduced by the grid mapping function are prevented from being used, and the calculation efficiency of electromagnetic temperature coupling analysis calculation is effectively improved.

Description

technical field [0001] The invention relates to the technical field of electrical equipment and simulation calculation, in particular to an adaptive electromagnetic-temperature multi-physical field coupling analysis method with degrees of freedom. Background technique [0002] With the development of electric power, energy and other industries, high-energy density and high-efficiency electrical equipment has become the pursuit goal of many applications. In the corresponding design, it is necessary to comprehensively consider multiple physical fields such as electromagnetic field and temperature field to achieve the ultimate utilization of materials; As an important part of the optimization design, the multi-physics simulation analysis method is the key support to achieve this goal. The electromagnetic-temperature multi-physics field weak coupling analysis method based on the independent numerical solution of the physical field is the main research and development direction a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F17/15G06F17/16G06F111/10G06F119/08
CPCG06F17/15G06F17/16G06F30/23G06F2111/10G06F2119/08
Inventor 张云鹏王清旋乔振阳邵定国赵剑飞
Owner SHANGHAI UNIV
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