CN109165408A - Without rod-type open cylinder combined seal structure optimization method - Google Patents
Without rod-type open cylinder combined seal structure optimization method Download PDFInfo
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- CN109165408A CN109165408A CN201810820552.5A CN201810820552A CN109165408A CN 109165408 A CN109165408 A CN 109165408A CN 201810820552 A CN201810820552 A CN 201810820552A CN 109165408 A CN109165408 A CN 109165408A
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- 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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Abstract
The invention discloses a kind of no rod-type open cylinder combined seal structure optimization methods, when the actuating plunger speed of no rod-type open cylinder reaches 30m/s, being seriously worn at sealing element contact lip is easily caused using combined seal structure (this spy's envelope, VL envelope etc.) common at present, the cross sectional shape for changing sealing element after optimization can reduce the maximum contact pressure at lip, and then reduce abrasion.Optimization Steps are as follows: 1) according to the selection of the box-like design of Sealing Structure parameter of the preliminary given group of operating condition and o-ring groove dimensional parameters；2) combined seal structure geometrical model is established in ABABQUS, 3) premised on geometrical model, parameterized model needed for establishing optimization process, 4) determine the big element of optimization design three, establish the optimized mathematical model of combined seal structure；5) finite element software ABAQUS is integrated using multidisciplinary optimization software I sight；6) suitable optimization algorithm is selected to carry out operation solution, the design parameter of the combined seal structure after being optimized.
Description
Technical field
The present invention relates to high speed dynamic sealing technology fields, and in particular to a kind of no rod-type open cylinder combined seal structure
Optimization method.
Background technique
No rod-type open cylinder be the pneumatic actuator of a kind of specific use, it can be achieved that the linear motion of high speed heavy load and
It moves back and forth, drive piston sealing element is under the working environment of high pressure, high speed, rigorous service condition, to sealing element
Performance requirement is also higher and higher.Combined seal structure is poly- four by a rubber o-ring and a high abrasion resistance
Vinyl fluoride slip-ring combination forms, when work, realized using the support force after O-ring elastomer polytetrafluoroethylene (PTFE) slip ring and
The sealing function of metal surface, the inner surface of polytetrafluoroethylene (PTFE) slip ring directly participate in quiet, the dynamic sealing in complexed metal face, rise main
Sealing function, O-ring is in addition to providing support force for slip ring, while it is auxiliary to provide the static state between cooperation groove face and primary seal slip ring face
Sealing is helped, and compensates the abrasion of slip ring.In use by the excellent sealing performance of rubber o-ring and polytetrafluoroethylene (PTFE)
Good antifriction antiwear is perfectly combined, and gives full play to respective advantage, is widely used in sealing industry.
As long as guaranteeing that sealing element contact pressure is greater than sealing-fluid pressure in static seal, and due to connecing in dynamic sealing
There are relative motions between contacting surface, it is therefore necessary to consider Sealing friction properties, need to establish good lubrication in contact surface.Frictional force
The larger response speed for not only influencing actuator, and accelerate sealing part abrasion, reduce sealing life.The increase meeting of contact pressure
Lead to the increase of frictional force；Lubricating film is too thick, then the mill vibration that rubs reduces, and leakage rate increases, and in addition the increase of sliding speed can make
The oil film that lubricating action must be played is destroyed, and sealing element causes the service life to be dropped significantly because cannot get good lubrication due to frictional heating
It is low.
Combined seal structure is represented with this spy's envelope and VL Feng Wei of Trelleborg company, is most able to satisfy dynamic sealing
Typical requirements, according to the product manual of Trelleborg company, this spy's envelope and the applicable highest sliding speed of VL envelope are
Therefore 15m/s is up to slip ring present in the dynamic sealing of 30m/s for sliding speed and is easily worn to cause seal failure
Problem reduces slip ring using the cross sectional shape that effective optimum structure design method changes sealing element and contacts lip contact pressure.
Problem of the existing technology: 1) existing combined sealing structure, which fails to be ensured of, meets under certain working condition requirement most
Good structural parameters；2) reasonable optimum structure design method is not used, combined seal structure is optimized.
Summary of the invention
The purpose of the present invention is to provide a kind of no rod-type open cylinder combined seal structure optimization methods, change after optimization
The cross sectional shape for becoming sealing element reduces contact pressure, solves under the premise of meeting seal request and is up to 30m/ for sliding speed
Slip ring present in the dynamic sealing of s is easily worn to cause seal failure problem.
The technical solution for realizing the aim of the invention is as follows: a kind of no rod-type open cylinder combined seal structure optimization side
Method, comprising the following steps:
Step 1, first according to the box-like design of Sealing Structure parameter of the preliminary given group of working condition requirement and o-ring groove size
Parameter is transferred to step 2.
Step 2 establishes combined seal structure geometry mould according to combined seal structure design parameter in ABABQUS
Type including selecting unit type, definition material attribute, grid dividing, defines contact relation, determines boundary condition and load
Lotus is transferred to step 3.
Step 3, premised on above-mentioned geometrical model, parameterized model needed for establishing optimization process, generate input file,
Optimization for next step Isight provides interface, is transferred to step 4.
Step 4, according to objective function, constraint condition and design variable, establish the optimization mathematical modulo of combined seal structure
Type is transferred to step 5.
Step 5 integrates ABAQUS software using Isight, completes input-output file and parses and carry out parameter list setting,
It is transferred to step 6.
Step 6, the suitable optimization algorithm of selection are iterated operation to optimized mathematical model and solve, the group after being optimized
The design parameter of box-like sealing structure.
Compared with prior art, the present invention its remarkable advantage is:
(1) it is integrated, is given full play to each soft using finite element software ABAQUS and multidisciplinary optimization software I sight
In place of the respective advantage of part, polytetrafluoroethylene (PTFE) slip ring and metal watch are effectively reduced under the premise of meeting seal request, after optimization
The maximum contact pressure of slip ring lip at face contact, to reduce the abrasion at lip.
(2) it is optimized using combinatorial optimization strategy and has played global optimization approach in whole design space traversal side
The advantage in face can quickly position design sensitizing range, while also play gradient optimal method in local optimum side
The advantage in face can accurately find design optimal solution.
(3) optimization method is applicable to the optimization of multiple combinations formula sealing structure.
Detailed description of the invention
Fig. 1 is sealing structure optimization process flow chart of the present invention.
Fig. 2 is Isight integrated optimization flow chart of the present invention.
Fig. 3 is step sealing structure figure of the present invention.
Fig. 4 is the stress-strain data curve graph that uniaxial compression of the present invention experiment obtains.
Fig. 5 is that present invention experiment obtains the stress-strain data curve graph after data and fitting.
Fig. 6 is finite element geometrical model figure of the present invention.
Fig. 7 is this spy's envelope design variable schematic diagram of the present invention.
Fig. 8 is present invention optimization front and back contrast schematic diagram.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing.
In conjunction with Fig. 1, a kind of no rod-type open cylinder combined seal structure optimization method of the present invention, including it is following
Step:
Step 1, first according to the box-like design of Sealing Structure parameter of the preliminary given group of working condition requirement and o-ring groove size
Parameter, wherein combined seal structure is formed by a rubber o-ring and a wear-resisting polytetrafluoroethylene (PTFE) slip-ring combination,
The sealing function of polytetrafluoroethylene (PTFE) slip ring and metal surface is realized when work using the support force after O-ring elastomer.
It is transferred to step 2.
Step 2 establishes combined seal structure geometry mould according to combined seal structure dimensional parameters in ABABQUS
Type including selecting unit type, definition material attribute, grid dividing, defines contact relation, determines boundary condition and load
Lotus.
For the rubber o-ring in combined seal structure, even same category of rubber material, different
There is also certain difference between model, therefore the more accurate material parameter in order to obtain in step 2), by being uniaxially stretched
Compression experiment obtains the load-deformation curve of rubber used in O-ring, and stress-strain data are imported into ABAQUS material parameter
In module, the constitutive model of O-ring rubber material is fitted, essentially rubber is a kind of elastic material, is applied
Its mechanical property shows as complicated material nonlinearity and geometrical non-linearity in sealing structure, adopts to the analysis of its strain energy function
With widely used two parameter Mooney-Rivlin constitutive model, which can handle up to 200% strain.Polytetrafluoroethyl-ne
The constitutive relation of alkene is described using linear elastic materials model.It is transferred to step 3.
Step 3, premised on above-mentioned geometrical model, parameterized model needed for establishing optimization process, generate input file,
Optimization for next step Isight provides interface, is transferred to step 4.
Step 4, according to objective function, constraint condition and design variable, establish the optimization mathematical modulo of combined seal structure
Type:
Objective function: min f (X)
Design variable: X=[X1, X2……Xn]
Constraint condition: Xi_min≤Xi≤Xi_ max, i=1,2 ... n
Wherein f (X) is the maximum contact pressure of polytetrafluoroethylene (PTFE) slip ring and metal surface contact position slip ring lip；XiIt is close
I-th of design variable of seal structure；Xi_ min is the lower limit value of i-th of design variable, Xi- max is its upper limit value；N is that design becomes
The number of amount.It is transferred to step 5.
Step 5 integrates ABAQUS software using Isight, completes input-output file and parses and carry out parameter list setting,
Wherein optimization process is integrated refers to using Isight optimization software, ABAQUS finite element software is integrated, in Command running environment
Lower calling sealing structure parameterized model file input.py submits to ABAQUS solver and carries out finite element analysis computation, obtains
It obtains and extracts target response (output.txt).The parsing function of Isight software to the design variable assignment in input file simultaneously
Differentiated, meet variable space condition and then submit to parameterized model file operation, target response knot is extracted after operation
Fruit；It is unsatisfactory for condition and then returns to a relatively very big penalty factor, while returning to input file to design variable again assignment, from
And entire optimization process is integrated into the optimization system that can be performed automatically, integrated optimization process is as shown in Figure 2.It is transferred to step
Rapid 6.
Step 6, the suitable optimization algorithm of selection are iterated operation to optimized mathematical model and solve, the group after being optimized
The design parameter of box-like sealing structure.Wherein optimization algorithm uses archipelago genetic algorithm (MIGA) and sequential quadratic programming algorithm
(NLPQL) combinatorial optimization strategy is first explored entire design space with genetic algorithm, positioning target extreme value is designing
Locating region in space, and globally optimal solution is obtained with this, then iterate to it by sequential quadratic programming algorithm
It more newly arrives the accurate globally optimal solution of Step wise approximation.
Embodiment 1
Si Te is sealed as common one of combined seal structure, by taking step sealing structure is as shown in Figure 3 as an example in detail
Illustrate optimum design method of the present invention.
A kind of no rod-type open cylinder combined seal structure optimization method of the present invention, comprising the following steps:
Step 1 tentatively selectes step sealing structure used according to the size of the actuating plunger of no rod-type open cylinder
Model, and o-ring groove size is rationally designed according to technical specification.
Step 2, in order to obtain more accurate O-ring rubber material property parameters are carried out single using electronic universal tester
Axis compression test obtains the load-deformation curve of rubber used in O-ring as shown in figure 4, stress-strain data are imported into
In ABAQUS material parameter module, the constitutive model of O-ring rubber material is fitted, it is two parameter that the present invention, which selects,
Mooney-Rivlin constitutive model, fitting result are as shown in Figure 5.
Step 3 establishes combined seal structure geometrical model according to the parameter in step 1) in ABABQUS, this spy's envelope
Sealing element can be reduced to planar axisymmetric model due to structure and the symmetry of load, be calculated to improve
Efficiency.Finite element geometrical model is as shown in Figure 6.
Step 4, premised on the geometrical model in step 3), write and established needed for optimization process using Python
Parameterized model saves the script file for being .py at suffix, so that the design parameter of combined seal structure can be convenient tune
It is whole, new model is automatically generated, the optimization for next step Isight provides interface.
5) optimized mathematical model of combined seal structure is established according to the requirement of design object:
Objective function: min f (X)
Design variable: X=[L β L0 H α]
Constraint condition:
Wherein f (X) is the maximum contact pressure at slip ring lip；L β L0Parameter shown in H α is as shown in Figure 7.
Step 5 integrates ABAQUS software using Isight, completes input-output file and parses and carry out parameter list setting.
Step 6, the suitable optimization algorithm of selection are iterated operation to optimized mathematical model and solve, using Task Plan
Component set is optimized at global optimization approach and gradient optimal method, and global optimization approach uses archipelago genetic algorithm
(MIGA), gradient optimal method uses sequential quadratic programming algorithm (NLPQL).
L β L can be obtained after operation in output file0Each parameter value of H α is to get to final optimization pass as a result, optimization
Front and back comparison is as shown in Figure 8.
Claims (6)
1. a kind of no rod-type open cylinder combined seal structure optimization method, which comprises the following steps:
Step 1, first according to the box-like design of Sealing Structure parameter of the preliminary given group of working condition requirement and o-ring groove dimensional parameters,
It is transferred to step 2；
Step 2 establishes combined seal structure geometrical model according to combined seal structure design parameter in ABABQUS,
In include selecting unit type, definition material attribute, grid dividing, define contact relation, determine boundary condition and load, be transferred to
Step 3；
Step 3, premised on above-mentioned geometrical model, parameterized model needed for establishing optimization process, generate input file, under
The optimization of one step Isight provides interface, is transferred to step 4；
Step 4, according to objective function, constraint condition and design variable, establish the optimized mathematical model of combined seal structure, turn
Enter step 5；
Step 5 integrates ABAQUS software using Isight, completes input-output file and parses and carry out parameter list setting, is transferred to
Step 6；
Step 6, the suitable optimization algorithm of selection are iterated operation to optimized mathematical model and solve, the combined type after being optimized
The design parameter of sealing structure.
2. no rod-type open cylinder combined seal structure optimization method according to claim 1, it is characterised in that: above-mentioned
In step 1, combined seal structure includes O-ring seals and a polytetrafluoroethylene (PTFE) slip ring made of rubber, when work
The sealing function of polytetrafluoroethylene (PTFE) slip ring and metal surface is realized using the support force after O-ring seals elastomer.
3. no rod-type open cylinder combined seal structure optimization method according to claim 2, it is characterised in that: above-mentioned
In step 2, for the O-ring seals in combined seal structure, because rubber material is a kind of elastic material, drawn by single shaft
The load-deformation curve that compression experiment obtains rubber used in O-ring seals is stretched, stress-strain data are imported into ABAQUS material
Expect to fit the constitutive model of O-ring seals rubber material in parameter module, that is, can determine the material properties of O-ring seals.
4. no rod-type open cylinder combined seal structure optimization method according to claim 1, it is characterised in that: above-mentioned
Optimized mathematical model in step 4 is as follows:
Objective function: minf (X)
Design variable: X=[X1, X2……Xn]
Constraint condition: Xi_min≤Xi≤Xi_max, i=1,2 ... n
Wherein f (X) is the maximum contact pressure of polytetrafluoroethylene (PTFE) slip ring and metal surface contact position slip ring lip；XiFor sealing knot
I-th of design variable of structure；Xi_ min is the lower limit value of i-th of design variable, Xi_ max is its upper limit value；N is design variable
Number.
5. no rod-type open cylinder combined seal structure optimization method according to claim 1, it is characterised in that: above-mentioned
In step 5, using Isight optimization software, ABAQUS finite element software is integrated, sealing knot is called under Command running environment
Structure parameterized model file input.py submits to ABAQUS solver and carries out finite element analysis computation, obtains and extract target
Response file output.txt；The parsing function of Isight software is to the design variable assignment in input file and differentiates,
Meet variable space condition and then submit to parameterized model file operation, target response result is extracted after operation；It is unsatisfactory for
Condition then returns to a relatively very big penalty factor, while returning to input file to design variable again assignment, thus entire
Optimization process is integrated into the optimization system that can be performed automatically.
6. no rod-type open cylinder combined seal structure optimization method according to claim 1, it is characterised in that: step
In 6, optimization algorithm uses the combinatorial optimization strategy of MIGA and NLPQL.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112749449A (en) * | 2019-10-31 | 2021-05-04 | 中核苏阀科技实业股份有限公司 | Implementation method of pressure self-tightening sealing structure |
| CN113761767A (en) * | 2021-08-25 | 2021-12-07 | 同济大学 | Design method for hydrogen fuel cell sealing element section taking alternating temperature influence into account |
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| CN104573212A (en) * | 2014-12-30 | 2015-04-29 | 中国石油天然气集团公司 | Optimization design method for oil casing screwed-joint sealing structure |
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| CN104573212A (en) * | 2014-12-30 | 2015-04-29 | 中国石油天然气集团公司 | Optimization design method for oil casing screwed-joint sealing structure |
Non-Patent Citations (1)
| Title |
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| 赵国伟等: "ISIGHT集成CATIA和ABAQUS的制动蹄轻量化设计", 《中南大学学报（自然科学版）》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112749449A (en) * | 2019-10-31 | 2021-05-04 | 中核苏阀科技实业股份有限公司 | Implementation method of pressure self-tightening sealing structure |
| CN113761767A (en) * | 2021-08-25 | 2021-12-07 | 同济大学 | Design method for hydrogen fuel cell sealing element section taking alternating temperature influence into account |
| CN113761767B (en) * | 2021-08-25 | 2024-03-26 | 同济大学 | Method for designing section of sealing element of hydrogen fuel cell by accounting for alternating temperature influence |
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