CN103995928A - Finite element analysis method for structure of interstage cooling equipment in space division industry - Google Patents
Finite element analysis method for structure of interstage cooling equipment in space division industry Download PDFInfo
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- CN103995928A CN103995928A CN201410205627.0A CN201410205627A CN103995928A CN 103995928 A CN103995928 A CN 103995928A CN 201410205627 A CN201410205627 A CN 201410205627A CN 103995928 A CN103995928 A CN 103995928A
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Abstract
The invention relates to a finite element analysis method for the structure of interstage cooling equipment in the space division industry. The method comprises the following processing steps that 1, main structures are extracted, and three-dimensional models with double-screw bolt connection are built; 2, finite element mesh division is carried out on double-screw bolts, nuts and other main structures; 3, the characteristic attributes of the double-screw bolts, the nuts and the three-dimensional models and the characteristic attributes between the three-dimensional models are set; 4, constraints are built, working pressure is exerted, and calculation is conducted; 5, a calculation result is analyzed. According to the finite element analysis method for the structure of the interstage cooling equipment in the space division industry, technicians can rapidly, safely and effectively design the interstage cooling equipment.
Description
Technical field
The present invention relates to cooling structure between air separation industry-level.Be specifically related to a kind of finite element method of empty branch trade inter-stage cooling device structure.Belong to field of heat exchange equipment.
Background technology
Aspect construction of pressure vessel design and check, be mainly to adopt Design with Rule method to design at present, application SW6.0 software is checked, and the design that can only be used for normal structure is checked.Tend to occur exceeding the problem of Design with Rule check scope for non-standard structure.Therefore, in the time there is this class problem, it is a good mode that the method for employing finite element is calculated, but the model of setting up while adopting at present analysis of finite element method to calculate is too simplified, the mode that adopts stud nut to connect for connecting portion is simplified processing (see figure 1), (step 1, sets up the three-dimensional model after simplifying to its concrete implementation step as shown in Figure 2; Step 2, finite element grid is divided; Step 3, sets up constraint, applies working pressure, calculates; Step 4, result of calculation analysis), the model that this simplification processing mode adopts, with in kind inconsistent, is not enough to reflect actual condition, can there is potential safety hazard in the result calculating by the heat transmission equipment of such modeling.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, a kind of finite element method of the empty branch trade inter-stage cooling device structure that relatively approaches real working condition is provided.
Technical scheme of the present invention is: a kind of empty branch trade inter-stage cooling device structural finite element analysis method, comprises following processing step:
Step 1, extraction primary structure, set up the three-dimensional model with Stud connection
According to St. Venant principle, set up the three-dimensional model of primary structure after simplifying, this three-dimensional model connects and composes bobbin carriage by channel cover and bobbin carriage housing by the first double-screw bolt and the first nut and tube sheet, tube sheet is connected with end plate with the second nut by the second double-screw bolt again, end plate and barrel soldering, finally formed the three-dimensional model of primary structure;
Step 2, stud nut and all the other primary structures are carried out to finite element grid division
According to the structure of step 1 gained, generate the grid of the three-dimensional model of primary structure by the mode of APDL command stream, form parametric modeling by the mode of command stream, comprise the division of basic grid, the attribute assignment of unit material;
Between step 3, the characteristic attribute that stud nut is set and stud nut and bobbin carriage, tube sheet and end plate, contact attribute
Positioning stud prestretched cross section, the attribute in definition double-screw bolt prestretched cross section, the surface of contact of definition nut and primary structure; Define between primary structure because the surface of contact of stud nut fastening effect; Attribute between definition surface of contact;
Step 4, foundation constraint, apply working pressure, calculates;
In software, utilize nonlinear solver, adopt the mode of load step, impose restriction according to actual conditions, to the double-screw bolt prestretched cross section imposed load of step 3 definition, the predeformation that after calculating, locking obtains, apply again the pressure under single operating mode and calculate, then apply all pressure and calculate result;
Step 5, result of calculation analysis
According to relevant criterion, adopt Stress Linearization mode to extract linearization stress result, according to pressure vessel material standard rating result; If do not meet the demands, revise three-dimensional model, calculate if meet the demands.
The double-screw bolt of being more than referred to as all refers to the first double-screw bolt and the second double-screw bolt, and the nut of general designation all refers to the first nut and the second nut.
The invention has the beneficial effects as follows:
Pass through said method, not only there is Fig. 1 Fig. 2 repertoire, consider again the first double-screw bolt, the attribute of the second double-screw bolt in reality connects, connected piece is consistent with actual conditions, can accurately simulate the first double-screw bolt, the second double-screw bolt, channel cover, bobbin carriage housing, tube sheet, end plate, deformational behavior and the stress state of the each parts of cylindrical shell under design conditions, improve simulation accuracy, be convenient on this basis the weakness of technician's discovering device and then provide foundation for revising design, thereby improve the security performance of equipment, adopt the mode of ANSYS APDL command stream to carry out parametric modeling simultaneously, seek the rule of modeling, can effectively reduce the time of finite element modeling, fast effectively, being convenient to technician grasps.
Brief description of the drawings
Fig. 1 is the modeling schematic diagram of former empty branch trade inter-stage cooling device structure that finite element analysis computation adopts.
Fig. 2 is the finite element analysis FB(flow block) of Fig. 1.
Fig. 3 is the modeling schematic diagram of empty branch trade inter-stage cooling device structure that finite element analysis computation adopts of the present invention.
Fig. 4 is the finite element analysis FB(flow block) of Fig. 3.
Reference numeral
Adapter 1, the first double-screw bolt 2.1, the second double-screw bolt 2.2, the first nut 3.1, the second nut 3.2, channel cover 4, bobbin carriage housing 5, tube sheet 6, end plate 7, cylindrical shell 8.
Embodiment
Below in conjunction with embodiment and accompanying drawing, describe the technical scheme of the inventive method in detail.
As shown in Fig. 3 ~ 4:
A finite element method that relatively approaches the empty branch trade inter-stage cooling device structure of real working condition, in conjunction with example, illustrates that its key step comprises as follows:
Step 1, extraction primary structure, set up the three-dimensional model with Stud connection
According to St. Venant principle, set up the three-dimensional model of primary structure after simplifying, this three-dimensional model connects and composes bobbin carriage by channel cover and bobbin carriage housing by the first double-screw bolt and the first nut and tube sheet, tube sheet is connected with end plate with the second nut by the second double-screw bolt again, end plate and barrel soldering, finally formed the three-dimensional model of primary structure;
Step 2, stud nut and all the other primary structures are carried out to finite element grid division
According to the structure of step 1 gained, generate the grid of the three-dimensional model of primary structure by the mode of APDL command stream, form parametric modeling by the mode of command stream, comprise the division of basic grid, the attribute assignment of unit material;
Between step 3, the characteristic attribute that stud nut is set and stud nut and bobbin carriage, tube sheet and end plate, contact attribute
Positioning stud prestretched cross section, the attribute in definition double-screw bolt prestretched cross section, the surface of contact of definition nut and primary structure; Define between primary structure because the surface of contact of stud nut fastening effect; Attribute between definition surface of contact;
Step 4, foundation constraint, apply working pressure, calculates;
In software, utilize nonlinear solver, adopt the mode of load step, impose restriction according to actual conditions, to the double-screw bolt prestretched cross section imposed load of step 3 definition, the predeformation that after calculating, locking obtains, apply again the pressure under single operating mode and calculate, then apply all pressure and calculate result;
Step 5, result of calculation analysis
According to relevant criterion, adopt Stress Linearization mode to extract linearization stress result, according to pressure vessel material standard rating result; If do not meet the demands, revise three-dimensional model, calculate if meet the demands.
The double-screw bolt of being more than referred to as all refers to the first double-screw bolt and the second double-screw bolt, and the nut of general designation all refers to the first nut and the second nut.
In the inventive method: first by technician, apparatus body is carried out to suitable simplification, obtain the feature of primary structure, set up with bolted three-dimensional model, stud nut and all the other primary structures are carried out to finite element grid division, characteristic attribute between stud nut and primary structure is set, boundary condition is set, then resolves in solver, finally judged whether to meet the demands to result aftertreatment and according to each class standard by technician.
Claims (1)
1. an empty branch trade inter-stage cooling device structural finite element analysis method, is characterized in that described method comprises following processing step:
Step 1, extraction primary structure, set up the three-dimensional model with Stud connection
According to St. Venant principle, set up the three-dimensional model of primary structure after simplifying, this three-dimensional model connects and composes bobbin carriage by channel cover and bobbin carriage housing by the first double-screw bolt and the first nut and tube sheet, tube sheet is connected with end plate with the second nut by the second double-screw bolt again, end plate and barrel soldering, finally formed the three-dimensional model of primary structure;
Step 2, stud nut and all the other primary structures are carried out to finite element grid division
According to the structure of step 1 gained, generate the grid of the three-dimensional model of primary structure by the mode of APDL command stream, form parametric modeling by the mode of command stream, comprise the division of basic grid, the attribute assignment of unit material;
Between step 3, the characteristic attribute that stud nut is set and stud nut and bobbin carriage, tube sheet and end plate, contact attribute
Positioning stud prestretched cross section, the attribute in definition double-screw bolt prestretched cross section, the surface of contact of definition nut and primary structure; Define between primary structure because the surface of contact of stud nut fastening effect; Attribute between definition surface of contact;
Step 4, foundation constraint, apply working pressure, calculates;
In software, utilize nonlinear solver, adopt the mode of load step, impose restriction according to actual conditions, to the double-screw bolt prestretched cross section imposed load of step 3 definition, the predeformation that after calculating, locking obtains, apply again the pressure under single operating mode and calculate, then apply all pressure and calculate result;
Step 5, result of calculation analysis
According to relevant criterion, adopt Stress Linearization mode to extract linearization stress result, according to pressure vessel material standard rating result; If do not meet the demands, revise three-dimensional model, calculate if meet the demands;
The double-screw bolt of being more than referred to as all refers to the first double-screw bolt and the second double-screw bolt, and the nut of general designation all refers to the first nut and the second nut.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106803002A (en) * | 2017-01-18 | 2017-06-06 | 北京林业大学 | A kind of function of mechanical steam recompression main heat exchanger exports method for arranging |
| CN110728084A (en) * | 2019-09-16 | 2020-01-24 | 中国第一汽车股份有限公司 | Forward design method for hollow thin-wall aluminum casting |
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| US20130078733A1 (en) * | 2011-09-25 | 2013-03-28 | Theranos, Inc., a Delaware Corporation | Systems and methods for fluid handling |
| CN103324797A (en) * | 2013-06-21 | 2013-09-25 | 上海交通大学 | Test and analysis method for overall fire resistance of high-rise steel frame structure |
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| CN101825501A (en) * | 2010-05-13 | 2010-09-08 | 哈尔滨工业大学 | Method for measuring power connector contact temperature rise based on finite element analysis of three-dimensional thermal field |
| US20130078733A1 (en) * | 2011-09-25 | 2013-03-28 | Theranos, Inc., a Delaware Corporation | Systems and methods for fluid handling |
| CN103324797A (en) * | 2013-06-21 | 2013-09-25 | 上海交通大学 | Test and analysis method for overall fire resistance of high-rise steel frame structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106803002A (en) * | 2017-01-18 | 2017-06-06 | 北京林业大学 | A kind of function of mechanical steam recompression main heat exchanger exports method for arranging |
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| CN110728084A (en) * | 2019-09-16 | 2020-01-24 | 中国第一汽车股份有限公司 | Forward design method for hollow thin-wall aluminum casting |
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Application publication date: 20140820 |