CN112949128A - Finite element analysis method for outer tank model of LNG storage tank - Google Patents
Finite element analysis method for outer tank model of LNG storage tank Download PDFInfo
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- CN112949128A CN112949128A CN202110235917.XA CN202110235917A CN112949128A CN 112949128 A CN112949128 A CN 112949128A CN 202110235917 A CN202110235917 A CN 202110235917A CN 112949128 A CN112949128 A CN 112949128A
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- 238000004458 analytical method Methods 0.000 title claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 230000003993 interaction Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 2
- 239000003949 liquefied natural gas Substances 0.000 abstract description 19
- 238000004364 calculation method Methods 0.000 abstract description 3
- 230000001788 irregular Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 4
- 239000000725 suspension Substances 0.000 description 3
- 239000007769 metal material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/04—Constraint-based CAD
Abstract
The invention discloses a finite element analysis method of an outer tank model of an LNG (liquefied natural gas) storage tank, which comprises the steps of compiling a storage tank latticed shell and a suspender unit in PYTHON (PYTHON) software, assigning section directions of different beam units, creating an entity model of the storage tank in ABAQUS (analog-to-digital converter) software and applying constraint, analyzing and calculating the model in the ABAQUS software, and checking a calculation result. By adopting the finite element analysis method for the outer tank model of the LNG storage tank, the modeling time is shortened, the modeling efficiency of the irregular free reticulated shell is improved, and the modeling accuracy is ensured.
Description
Technical Field
The invention relates to the field of LNG storage tank design, in particular to a finite element analysis design method for an integral model of an outer tank made of a metal material.
Background
The LNG (liquefied natural gas) has methane as the main component, is known as the cleanest energy on earth, and has the advantages of high heat value, low pollution, low price and the like. The storage scale tends to be large-scale due to high storage efficiency and land occupation saving. At present, large LNG storage tanks built in China all adopt overground full-capacity tanks, and mainly comprise steel sub-support inner tanks, concrete outer tanks, foundations, thermal protection systems and auxiliary equipment.
However, the research on the conventional LNG storage tank with metal materials for the inner tank and the outer tank is less, the structure and the scale of the storage tank have serious single characteristics, and the innovation is serious and insufficient. When the LNG storage tank adopts a free reticulated shell and the like, the structure is complex, and when the ABAQUS is directly used for modeling, a large amount of time is needed, and the efficiency and the operation accuracy are reduced.
Disclosure of Invention
The invention aims to provide a finite element analysis method for an outer tank model of an LNG storage tank, which solves the problem that the modeling of the LNG storage tank by adopting a free latticed shell is complex.
In order to achieve the above object, the present invention provides a finite element analysis method for an outer tank model of an LNG storage tank, comprising the steps of:
s1: vault modeling, namely compiling a py-format script file in PYTHON software, defining component parameters of a latticed shell and a suspender, and writing a txt-format first text; then, beam unit modeling is carried out on the latticed shell and the suspender by using a cyclic statement to form a grid structure;
s2: solid modeling, namely reading a first text in ABAQUS software and running a script file, and then performing shell unit simplified modeling on a ceiling board, an outer wall board, a tank bottom board and a reinforcing ring;
s3: defining the trend of the beam units, defining the section direction of each beam unit in PYTHON software, and writing a txt format second text;
s4: establishing constraint, reading the second text in ABAQUS software, running script text, and establishing constraint between the beam unit and the shell unit and between the shell unit and the shell unit to complete interaction setting between nodes;
s5: and (3) analyzing and calculating the model, applying dead weight load to the model by ABAQUS software, sequentially checking the stress and displacement borne by each component, comparing the stress and displacement with the allowable stress and the allowable displacement, and judging whether each component of the model is qualified.
Preferably, the parameters of the components of the net shell and the boom in step S1 are written in the form of node coordinates into the first text.
Preferably, before the latticed shell and the hanger rod are generated into the grid structure in step S1, whether the different latticed shells and the rod pieces can be spliced or not is judged through boolean operations.
Preferably, the beam section direction is written in the second text in the form of a normal vector in step S3.
Preferably, the constraints in step S4 include TIE constraints and boundary constraints.
The finite element analysis method of the outer tank model of the LNG storage tank adopting the structure has the following advantages:
1. the method has the advantages that the innovation is realized, the PYTHON and the ABAQUS are combined to carry out parametric modeling, the modeling time is shortened, and the modeling accuracy is improved;
2. the method solves the problems of complex finite element modeling and non-convergence of finite element calculation caused by complex structure of the large LNG storage tank.
Drawings
FIG. 1 is a diagram of a prior art external LNG storage tank;
FIG. 2 is a flow chart of an embodiment of the present invention.
Reference numerals
1. A dome; 2. an outer wall panel; 3. and a reinforcing ring.
Detailed Description
The technical solution of the present invention is further illustrated by the accompanying drawings and examples.
As shown in fig. 1, the LNG storage tank outer tank module includes a dome 1, an outer wall plate 2, and a reinforcing ring 3, wherein the dome 1 includes a net shell and a suspension rod, and the net shell and the suspension rod are integrated with each other.
Aiming at the LNG storage tank adopting the free latticed shell and the asymmetric suspender component, the application provides a new modeling mode and a finite element analysis method.
As shown in fig. 2, the method comprises the following steps:
s1: and (3) vault modeling, writing a py format script file in PYTHON software, defining component parameters of a latticed shell and a suspender, and writing a txt format first text according to a node coordinate form. The member parameters comprise the dimension parameters of the rod piece and the strong axis direction. And then, carrying out beam unit modeling on the latticed shell and the suspender by using a cycle statement to form a grid structure. Before the latticed shell and the suspender generate the grid structure, whether the different latticed shells and the rod pieces can be spliced or not is judged through Boolean operation.
S2: and (3) solid modeling, reading the first text in ABAQUS software, running a script file, and performing shell unit simplified modeling on the ceiling plate, the outer wall plate 2, the tank bottom plate and the reinforcing ring 3.
S3: defining the trend of the beam units, defining the section direction of each beam unit in PYTHON software, and writing a txt format second text in the form of a normal vector.
S4: and (4) establishing constraints, reading the second text in ABAQUS software, running a script text, and then establishing constraints between the beam unit and the shell unit and between the shell unit and the shell unit to complete the interaction setting between the nodes. During modeling, TIE constraint is established between the suspension rod and the suspended ceiling plate, TIE constraint is established between the arch crown 1 and the reinforcing ring 3, TIE constraint is established between the outer wall plate 2 and the reinforcing ring 3, boundary constraint is established on the tank bottom plate, and boundary conditions of the nodes are consistent with actual conditions.
S5: and (3) analyzing and calculating the model, applying dead weight load to the model by ABAQUS software, sequentially checking the stress and displacement borne by each component, comparing the stress and displacement with the allowable stress and the allowable displacement, and judging whether each component of the model is qualified.
In conclusion, by adopting the finite element analysis method of the outer tank model of the LNG storage tank with the structure, the boundary conditions of the nodes are consistent with the actual conditions, and the accuracy of the calculation result is ensured. The ABAQUS software and the PYTHON software are combined for use, so that the modeling time is shortened, and the modeling efficiency of the irregular free reticulated shell is improved.
The above is a specific embodiment of the present invention, but the scope of the present invention should not be limited thereto. Any changes or substitutions that can be easily made by those skilled in the art within the technical scope of the present invention are included in the protection scope of the present invention, and therefore, the protection scope of the present invention is subject to the protection scope defined by the appended claims.
Claims (5)
1. A finite element analysis method for an outer tank model of an LNG storage tank is characterized by comprising the following steps:
s1: vault modeling, namely compiling a py-format script file in PYTHON software, defining component parameters of a latticed shell and a suspender, and writing a txt-format first text; then, beam unit modeling is carried out on the latticed shell and the suspender by using a cyclic statement to form a grid structure;
s2: solid modeling, namely reading a first text in ABAQUS software and running a script file, and then performing shell unit simplified modeling on a ceiling board, an outer wall board, a tank bottom board and a reinforcing ring;
s3: defining the beam section trend, defining the section direction of each beam unit in PYTHON software, and writing a txt format second text;
s4: establishing constraints, reading the second text in ABAQUS software, running script texts, and then establishing constraints between the beam unit and the shell unit and between the shell unit and the shell unit to complete the interaction setting between nodes;
s5: and (3) analyzing and calculating the model, applying dead weight load to the model by ABAQUS software, sequentially checking the stress and displacement borne by each component, comparing the stress and displacement with the allowable stress and the allowable displacement, and judging whether each component of the model is qualified.
2. The finite element analysis method of an outer tank model of an LNG storage tank according to claim 1, characterized in that: the component parameters of the latticed shell and the suspender in the step S1 are written into the first text in the form of node coordinates.
3. The finite element analysis method of an outer tank model of an LNG storage tank according to claim 1, characterized in that: before the latticed shell and the suspender generate the grid structure in the step S1, whether the different latticed shells and the rod pieces can be spliced or not is judged through boolean operation.
4. The finite element analysis method of an outer tank model of an LNG storage tank according to claim 1, characterized in that: the beam section direction is written in the second text in the form of a normal vector in step S3.
5. The finite element analysis method of an outer tank model of an LNG storage tank according to claim 1, characterized in that: the constraints in step S4 include TIE constraints and boundary constraints.
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2021
- 2021-03-03 CN CN202110235917.XA patent/CN112949128A/en active Pending
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