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Buried flexible pipeline finite element simplification method based on global optimization iterative algorithm

An iterative algorithm and global optimization technology, applied in the field of pipelines, can solve the problems of difficult-soil effects, difficult-to-manage soil interactions, complicated calculation parameter settings, etc., to simplify calculation parameter settings, shorten calculation time, and speed up calculation convergence. Effect

Active Publication Date: 2020-07-17
HUANGGANG NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of spring simulation method greatly simplifies the problem of soil pressure simulation by finite element method, and the determination of soil spring parameters has the following difficulties: (1) it is difficult to reflect the complex actual soil effect; (2) it is difficult to reflect the fine pipe-soil interaction (3) It is difficult to realize the buckling analysis of the pipeline; (4) It is difficult to realize the failure mechanism research of the pipeline
The pipe-soil contact method has great difficulties in modeling complex pipe fittings and pipelines, the calculation parameters are complicated to set, and the calculation time is long

Method used

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  • Buried flexible pipeline finite element simplification method based on global optimization iterative algorithm
  • Buried flexible pipeline finite element simplification method based on global optimization iterative algorithm
  • Buried flexible pipeline finite element simplification method based on global optimization iterative algorithm

Examples

Experimental program
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Effect test

Embodiment 1

[0063] An example of the finite element simplification method for buried flexible pipelines based on the global optimization iterative algorithm under the same buried depth and different pipe diameters.

[0064] Taking the 10m-long buried glass steel pipe as an example, the inner diameters of the pipes are: 1200mm, 1400mm, 1600mm, 1800mm, and 2000mm. The model analysis parameters are shown in Table 1.

[0065] Table 1 Analysis model parameters

[0066]

[0067]

[0068] Use finite element software to establish 10m long and pipe inner diameters: 1200mm, 1400mm, 1600mm, 1800mm, 2000mm pipe models;

[0069] Define material parameters according to the parameters in the analysis model parameter table, related parameters include tube density, tube isotropic elastic modulus, tube shear modulus, tube Poisson's ratio, etc.;

[0070] Carry out grid division for the established model, the unit length of the axial pipeline grid is 0.1mm, and the unit length of the circumferential ...

Embodiment 2

[0089] An example of finite element simplification method for buried flexible pipeline based on global optimization iterative algorithm under the same pipe diameter and different soil conditions.

[0090] Taking the 10m-long buried glass steel pipe as an example, the inner diameter of the pipe is 1800mm, and the soil reaction moduli are: 3Mpa, 4Mpa, 5Mpa, 6Mpa, 7Mpa. The model analysis parameters are shown in Table 3.

[0091] Table 3 Analysis model parameters

[0092]

[0093]

[0094] Use finite element software to establish a pipeline model with a length of 10m, an inner diameter of 1800mm, and a wall thickness of 27.07mm;

[0095] Define the material parameters according to the parameters in the analysis model parameter table. The relevant parameters include pipe density, pipe isotropic elastic modulus, pipe shear modulus, pipe Poisson's ratio, etc.; the soil reaction moduli are: 3Mpa, 4Mpa , 5Mpa, 6Mpa, 7Mpa

[0096] Carry out grid division for the established mo...

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Abstract

The invention discloses a buried flexible pipeline finite element simplification method based on a global optimization iterative algorithm. The method comprises the following steps: establishing a pipeline model; calculating to obtain a theoretical soil pressure value in the horizontal direction of the flexible pipe and the radial total elongation of the pipe; applying the static earth pressure initial value around the flexible pipe to each node of the finite element model; calculating to obtain a finite element solution of the radial total elongation of the pipe; establishing a global optimization iterative algorithm objective function, and judging a radial deformation error; judging whether the radial deformation error is too large or not, and calculating a sensitivity matrix of a globaloptimization iterative algorithm to obtain a horizontal soil pressure value of next iteration; and applying the soil pressure value to the finite element model to obtain the stress distribution condition of the buried flexible pipe. According to the method, the complex interaction between the pipe and the soil is simplified, the finite element modeling difficulty is reduced, the combined action of the soil body and the structure can be reasonably reflected, and three-dimensional structural performance calculation and analysis are realized, so that the stress distribution condition of the buried pipe is obtained, and the pipe danger occurrence area is determined.

Description

technical field [0001] The invention relates to the technical field of pipelines, in particular to a finite element simplification method for buried flexible pipelines based on a global optimization iterative algorithm. Background technique [0002] At present, the methods for analyzing the structural performance of buried flexible pipes mainly include semi-empirical formula and finite element method. [0003] The semi-empirical formula believes that under the action of the vertical pressure of the overlying soil, the additional stress of the ground load, and the reaction force of the foundation support at the bottom of the pipe, the cross-section of the buried flexible pipe may appear elliptical, that is, the pipe wall will produce uneven radial deformation. The theory assumes that the two sides of the vertical center line are symmetrical, but it does not assume that the horizontal center line is symmetrical up and down. The relationship between bending moment, shear and lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F113/14
Inventor 肖俊卢雪松方玺李俊吕泳
Owner HUANGGANG NORMAL UNIV
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