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An overhead conductor shape finding method based on ABAQUS finite element software

An overhead wire and finite element technology, applied in geometric CAD, special data processing applications, instruments, etc., can solve the problems of limited use of prefabricated model update method, low calculation accuracy, poor operability, etc., and achieve stable calculation results , good operability and high precision

Active Publication Date: 2019-04-05
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Among them, both the direct iteration method and the small elastic modulus iterative method have the disadvantage of poor coherence. The small elastic modulus method also needs to set an external loop, so as to continuously update the model, which has poor operability, and the prefabricated model update method has limitations. property, cannot correspond to more complex situations, and the calculation accuracy is not high

Method used

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  • An overhead conductor shape finding method based on ABAQUS finite element software
  • An overhead conductor shape finding method based on ABAQUS finite element software
  • An overhead conductor shape finding method based on ABAQUS finite element software

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Such as figure 2 As shown, there is an existing wire model, and its specific data are, elastic modulus E=55GPa, diameter 26.81mm, and cross-sectional area 426.28mm 2 , with a self-weight of 1.18kg / m, it is now installed between two towers with a span of 300m and no height difference. The horizontal stress during installation is 30Mpa. Analyze and calculate the shape and internal force of the wire.

[0152] Detailed process:

[0153] Calculate the required parameters

[0154]

[0155] Among them, h 0 is the catenary equation parameter determined by the wire properties, σ 0 is the horizontal stress under the gravity of the conductor,

[0156] A is the cross-sectional area of ​​the wire, p is the mass per unit length of the wire, and g is the acceleration due to gravity;

[0157] Calculate the curve left endpoint, right endpoint

[0158]

[0159] l b =l+l a =150

[0160] Among them, l a is the abscissa of the left endpoint of the wire, l b is the abscissa...

Embodiment 2

[0182] There is a wire model, the specific data is, elastic modulus E=55GPa, diameter 26.81mm, cross-sectional area 426.28mm 2 , with a self-weight of 1.18kg / m, it is now installed between two towers with a span of 300m and a height difference of 50m. The horizontal stress during installation is 55.1Mpa. Analyze and calculate the shape and internal force of the wire.

[0183] Detailed process:

[0184] Calculate the required parameters

[0185]

[0186] Among them, h 0 is the catenary equation parameter determined by the wire properties, σ 0 is the horizontal stress of the conductor under gravity, A is the cross-sectional area of ​​the conductor, p is the mass per unit length of the conductor, and g is the acceleration due to gravity;

[0187] Calculate the curve left endpoint, right endpoint

[0188]

[0189] l b =l+l a =-186.6710

[0190] Among them, l a is the abscissa of the left endpoint of the wire, l b is the abscissa of the right end of the wire, l is th...

Embodiment 3

[0212] There is a wire model, the specific data is, elastic modulus E=55GPa, diameter 26.81mm, cross-sectional area 426.28mm 2 , with a self-weight of 1.18kg / m, it is now installed between two towers with a span of 300m and no height difference, and the horizontal stress during installation is 30Mpa. Analyzing and calculating the shape and internal force of the wire, this embodiment 3 is the same as the embodiment 1, but the coordinates of the inflection point are changed.

[0213] Detailed calculation process:

[0214] Calculate the required parameters

[0215]

[0216] Among them, h 0 is the catenary equation parameter determined by the wire properties, σ 0 is the horizontal stress of the conductor under gravity, A is the cross-sectional area of ​​the conductor, p is the mass per unit length of the conductor, and g is the acceleration due to gravity;

[0217] Calculate the curve left endpoint, right endpoint:

[0218]

[0219] l b =l+l a =150

[0220] Among the...

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Abstract

The invention discloses an overhead conductor shape finding method based on ABAQUS finite element software, and the method comprises the following steps: S1, calculating the length and elongation of aconductor under the action of gravity, and solving the length of the conductor under an unstressed condition, namely, the original length of the conductor; S2, calculating the linear distance of a wire hanging point, and comparing the linear distance of the wire hanging point with the original length of the wire calculated in the step S1 so as to judge the initial shape of the wire; S3, modelingis carried out according to the initial shape of the wire, initial assembly stress is preset, finite element analysis is carried out after the attenuation coefficient in the analysis step is set, a resolving result is obtained, and simulated sag and simulated maximum stress are obtained; And S4, calculating a relative error value of a resolving result, judging the correctness of modeling, finishing resolving if the error value conforms to a preset threshold condition, and returning to S3 to correct the attenuation coefficient in the analysis step and continuously executing until the error value conforms to the preset threshold condition if the error value does not conform to the preset threshold condition. The method is simple to operate, stable in calculation result and high in accuracy.

Description

technical field [0001] The invention belongs to the technical field of form-finding for electric overhead wires, and in particular relates to a form-finding method for overhead wires based on ABAQUS finite element software. Background technique [0002] For transmission line safety, analyzing its various stress conditions is the basis of researching line safety. As a suspension cable structure, the transmission line can only be subjected to tension but not compression, and does not bear bending moment. The initial configuration relationship of the conductor plays an important role in the dynamic analysis of the conductor. Determining the initial configuration of the conductor is the key to analyzing the conductor. The starting point of the dynamic response is directly related to the calculation accuracy in the future. [0003] Currently, there are several form-finding methods based on finite element software: [0004] 1. Direct iteration method, which can be found in Zhang...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2113/16G06F30/17
Inventor 曹咏弘白天明李海涛关学锋
Owner ZHONGBEI UNIV
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