CN109033601A - A kind of CAE design method of pre-parsed boundary condition - Google Patents
A kind of CAE design method of pre-parsed boundary condition Download PDFInfo
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- CN109033601A CN109033601A CN201810788415.8A CN201810788415A CN109033601A CN 109033601 A CN109033601 A CN 109033601A CN 201810788415 A CN201810788415 A CN 201810788415A CN 109033601 A CN109033601 A CN 109033601A
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- G06F30/00—Computer-aided design [CAD]
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- 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 CAE design methods of pre-parsed boundary condition, further include the steps that pre-parsed is handled between preceding processing and finite element analysis intermediate step, it further comprises following steps: for boundary condition, described for boundary condition includes boundary condition identifier and boundary condition parameter for setting；It identifies the boundary condition identifier, and transfers the parsing scheme of corresponding boundary condition identity symbol from condition resolution library according to it；Set boundary condition parameter is solved using the parsing scheme；The solution acquired is patterned expression；According to model constructed by the modified result of the graphic representation.Based on technical solution of the present invention, designer more quickly quick can adjust product design, from without spending the process and time that more the time goes waiting parameter adjustment with interative computation, realize higher design efficiency.
Description
Technical field
The present invention relates to CAE design and analysis technical field more particularly to a kind of design sides CAE of pre-parsed boundary condition
Method.
Background technique
When carrying out performance evaluation and simulation to engineering or product using CAE software or method, following three will be generally undergone
A process: (1) pre-treatment: solid modelling and parametric modeling are given, the Boolean calculation of component, unit automatic division, node is automatic
Number is automatically generated with node parameter, and load and material parameter have directly inputted parameters of formulaization importing, and joint load is given birth to automatically
At finite element model Automatic generation of information etc.；(2) finite element analysis: finite elements library, material depot and related algorithm, at constraint
Adjustment method, finite element system assemble module, static(al), power, vibration, linearity and non-linearity solution Faku County；(3) it post-processes: will be limited
Meta analysis result is supplied to user to graphically, and auxiliary user determines the reasonability of calculated result and design scheme.
The problem of user examines product according to the result of post-processing, returns in Model Reconstruction and pre-treatment and goes to adjust
Product design, the above-mentioned simulation test process of carry out repeatedly, carries out volume production again after reaching design requirement.Thus, it cannot
Intuitively see specifying information of the boundary condition set in pre-treatment in node/finite element, is needed when adjusting product design
More simulation test, influences efficiency of research and development；And for preliminary design person, since its experience is more short of, adjusting
It does not usually know how to need more simulation test to adjustment is correctly oriented, take a substantial amount of time when design parameter
The product for meeting design requirement could be adjusted out.
How to provide it is a kind of more efficiently, can Computer Aided Design person quickly adjust product design CAE deisgn product or
Method is this field problem to be solved.
Summary of the invention
The purpose of the present invention is to provide it is a kind of more efficiently, can Computer Aided Design person quickly adjust product design
The method of CAE design, so that designer need not spend more time to go to wait the mistake of parameter adjustment and interative computation
Journey and time realize higher design efficiency.
To achieve the above object, the present invention provides a kind of CAE design methods of pre-parsed boundary condition, including walk as follows
It is rapid: building model, pre-treatment, finite element analysis, post-processing, adjusted design, actual production test；It is described it is preceding processing and it is limited
Further include the steps that pre-parsed is handled between meta analysis, the pre-parsed processing further comprises following steps:
Step 1: for boundary condition, described for boundary condition includes that boundary condition identifier and boundary condition are joined for setting
Number；
Step 2: identifying the boundary condition identifier, and transfer corresponding boundary condition identity from condition resolution library according to it
The parsing scheme of symbol；
Step 3: set boundary condition parameter being solved using the parsing scheme；
Step 4: the solution acquired is patterned expression；
Step 5: according to model constructed by the modified result of the graphic representation.
In a kind of possible embodiment: it is described for boundary condition be torque, surface pressure, force per unit length, acceleration,
Centrifugal force, default temperature load, node temperature load, node temperature heat are transmitted, concurrent condition heat is transmitted, heat stream heat is transmitted,
One of Level Set method；The boundary condition identifier corresponds to above-mentioned respectively for boundary condition.
In a kind of possible embodiment: the boundary condition parameter includes boundary value and parameter value；The boundary value
For boundary node set, the position of several boundary nodes comprising being set as boundary.
In a kind of possible embodiment: the parsing scheme is static force analysis method, kinematic analysis method, thermal-stress analysis
Method, hot fluid simulation analysis method；
Wherein, the static force analysis method corresponds to the torque, surface pressure, force per unit length etc. for boundary condition；It is described dynamic
Force analysis corresponds to the acceleration, centrifugal force etc. for boundary condition；The thermal-stress analysis method corresponds to the default temperature
Load, node temperature load, the transmitting of node temperature heat etc. are for boundary condition；It is described right that the hot fluid simulation analysis method corresponds to
The transmitting of stream condition heat, the transmitting of heat stream heat, Level Set method etc. are for boundary condition.
In a kind of possible embodiment: before the application parsing Scheme Solving, introducing the boundary value and parameter value；
The solution acquired is to correspond on each boundary node accordingly for the numerical solution of boundary condition type.
In a kind of possible embodiment: processing is patterned to the solution acquired by computer graphics techniques, with
Realize the graphic representation in step 4.
In a kind of possible embodiment: the computer graphics techniques are the 3 D image drawing technology based on MFC.
In a kind of possible embodiment: in steps of 5, according to the graphic representation obtained in step 4 as a result, simultaneously
In conjunction with inherent constraint, constructed model is corrected, makes it without departing from the inherent constraint；The inherent constraint includes material load
Constraint, temperature range constraint, spatial position constraint
In traditional CAE design method, it is necessary to which comprehensive multiple boundary condition operations, the result post-processed can just know
Constructing model whether there is problem, and designer is difficult to know the where for having constructed model in the presence of scarce according to calculating structure
It falls into, thus the efficiency of R & D design is more low.After above step, design method of the invention is proposed with pre-parsed
The CAE design method of processing step transfers general analytical algorithm according to boundary condition identifier, calculates on given boundary
Under the conditions of, the corresponding information of model is constructed, so that designer understand that the existing of under boundary condition product design
Defect, and product design is adjusted according to the single boundary condition, also it is the parameter of the model constructed, has reached refinement and adjusted
Perfect square to effect, further such that each successive step in product design all has adjustment direction definitely, design
The adjustment direction that the comprehensive all kinds of boundary conditions of personnel are presented, just can obtain all kinds of boundaries for meeting corresponding product demand quickly
The optimal design of condition, and corresponding best model is constructed, overcome the defects of traditional CAE design method.
Detailed description of the invention
Fig. 1 shows the flow diagram of method provided by the present invention；
Fig. 2 shows the boundary condition schematic diagrames of embodiment 1；
Fig. 3 shows the graphic representation schematic diagram after embodiment 1 parses；
Fig. 4 shows the boundary condition schematic diagram of embodiment 2；
Fig. 5 shows the graphic representation schematic diagram after embodiment 2 parses.
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with attached drawing.Fig. 1 is please referred to, is shown in Fig. 1
Go out a kind of flow diagram of the CAE design method of pre-parsed boundary condition provided by the present invention comprising following steps:
Construct model, pre-treatment, finite element analysis, post-processing, adjusted design, actual production test.
Particularly, in the present invention, further include the steps that pre-parsed is handled between the pre-treatment and finite element analysis, specifically
, the pre-parsed processing further comprises following steps:
Step 1: for boundary condition, described for boundary condition includes that boundary condition identifier and boundary condition are joined for setting
Number；
Step 2: identifying the boundary condition identifier, and transfer corresponding boundary condition identity from condition resolution library according to it
The parsing scheme of symbol；
Step 3: set boundary condition parameter being solved using the parsing scheme；
Step 4: the solution acquired is patterned expression；
Step 5: according to model constructed by the modified result of the graphic representation.
In traditional CAE design method, it is necessary to which comprehensive multiple boundary condition operations, the result post-processed can just know
Constructing model whether there is problem, and designer is difficult to know the where for having constructed model in the presence of scarce according to calculating structure
It falls into, thus the efficiency of R & D design is more low.After above step, design method of the invention is proposed with pre-parsed
The CAE design method of processing step transfers general analytical algorithm according to boundary condition identifier, calculates on given boundary
Under the conditions of, the corresponding information of model is constructed, so that designer understand that the existing of under boundary condition product design
Defect, and product design is adjusted according to the single boundary condition, also it is the parameter of the model constructed, has reached refinement and adjusted
Perfect square to effect, further such that each successive step in product design all has adjustment direction definitely, design
The adjustment direction that the comprehensive all kinds of boundary conditions of personnel are presented, just can obtain all kinds of boundaries for meeting corresponding product demand quickly
The optimal design of condition, and corresponding best model is constructed, overcome the defects of traditional CAE design method.
Specifically, the type described in step 1 for boundary condition includes torque, surface pressure, force per unit length, acceleration
Degree, centrifugal force, default temperature load, node temperature load, the transmitting of node temperature heat, the transmitting of concurrent condition heat, heat stream heat pass
It passs, Level Set method.When setting, for boundary condition be one of which, the boundary condition identifier correspond to it is above-mentioned respectively for
Boundary condition.
In addition to the boundary condition identifier, the input of designer further includes boundary condition parameter, the boundary condition
Parameter includes boundary value and parameter value, and the parameter value is the parameter value of corresponding boundary condition；And the boundary value is then progress
The set of the upper boundary node of model after pre-treatment, the positions of several boundary nodes comprising being set as boundary.
In step 2 and step 3, the parsing scheme is static force analysis method, kinematic analysis method, thermal-stress analysis method, hot-fluid
Body simulation analysis method.The above method is stored in condition resolution library, and is respectively provided with corresponding analytical range, corresponds to one
Determine type for boundary condition, only corresponding parsing scheme need to be transferred from condition resolution library i.e. according to boundary condition identifier
It can.
As described above respectively for boundary condition, wherein the static force analysis method corresponds to the torque, surface pressure, line point
Cloth power etc. is for boundary condition；The kinematic analysis method corresponds to the acceleration, centrifugal force etc. for boundary condition；The heat is answered
Force analysis corresponds to the default temperature load, node temperature load, the transmitting of node temperature heat etc. for boundary condition；The heat
Fluid emulation analytic approach corresponds to the concurrent condition heat transmitting, the transmitting of heat stream heat, Level Set method etc. for boundary condition.It is described
It further include corresponding torque parsing scheme, surface pressure parsing scheme, force per unit length parsing scheme etc. in static force analysis method, other are same
Reason, therefore do not repeat.
Before the application parsing Scheme Solving, need to introduce the boundary value and parameter value.After carrying out step 3, institute
Stating the solution acquired is to correspond on each boundary node accordingly for the numerical solution of boundary condition type.
Further, the embodiment of the present invention is patterned processing to the solution acquired by computer graphics techniques, with reality
Graphic representation in existing step 4.Specifically, the computer graphics techniques may be based on the 3 D image drawing technology of MFC.
It imports the numerical solution of the model constructed and corresponding boundary condition obtained above, and is drawn accordingly according to internal algorithm
Calculated result figure is referred to for designer.
In steps of 5, according to the graphic representation obtained in step 4 as a result, and combine inherent constraint, constructed by amendment
Model, make it without departing from the inherent constraint.The inherent constraint is material load constraint, temperature range constraint, space bit
Constraint etc. is set, is mainly the influence factor of certain external inherent limitations.After providing the parsing result of graphic representation, herein
Adjustment, the Knowledge Capability and design experiences for relying primarily on designer are adjusted correspondingly, but its difficulty still compares biography
It unites technically simple much more convenient.
Specific embodiments of the present invention are described below in conjunction with Fig. 2-5.
Embodiment 1
Referring to figure 2. -3, the present embodiment is by taking the sunykatuib analysis of automobile frame as an example, and automobile is when operation, vehicle frame meeting
It further include issuable various complexity in operational process other than the car body weight that automobile itself has by various load
Dynamic stress and thermal stress.
It, can be by confirming single load in mesh after adjusting Vehicle Frame Design with CAE design method of the present invention
The function and effect for marking fulcrum, judge whether Vehicle Frame Design adjusts to reasonable direction, to reduce unnecessary simulation test
Process improves design efficiency.
Specifically, the corresponding position of the target fulcrum is identified with node location, in Fig. 2, if representing boundary value
The position of dry boundary node is indicated with solid stain, corresponding, and the parameter value is that corresponding boundary condition types are force per unit length
10000.00N, call static force analysis method in include corresponding force per unit length analytic method, the solution acquired as shown in figure 3, its
The graphic representation result clearlying show after solving, it can be seen that the setting load is in corresponding target fulcrum and preceding
Function and effect after processing on corresponding each boundary node.Designer according to Fig.3, as a result, bond material it is allowable
The parameters such as stress, maximum load just can be defined more, correct and adjust the model constructed with having direction.
Embodiment 2
Referring to figure 4. -5, the present embodiment is the embodiment that a boundary condition type is surface pressure, boundary condition parameter
Including boundary value and parameter value.The corresponding side of all node on behalf in the range of being surrounded by several solid stains in Fig. 4
Boundary's node, and then indicate the boundary value, and corresponding parameter value is the 10000.00N of corresponding boundary condition types surface pressure.
Specifically, the effective object of the surface pressure in Fig. 4 is the sphere of action of entire boundary value, the size of the surface pressure
It is known that according to the coordinate for carrying out each node after finite element segmentation to the model in pre-treatment step, it can be in the hope of corresponding
Limited elemental area, and then obtain the stress value in each finite element.After calling the parsing scheme of corresponding force per unit area to be solved,
Its graphic representation result is as shown in figure 5, stress value of each node under above-mentioned load is clearly indicated.Designer according to
It is shown in fig. 5 as a result, the parameters such as allowable stress, maximum load of bond material, just can more define, correct and adjust with having direction
The whole model constructed.
The above description is only a preferred embodiment of the present invention, is not intended to limit its scope of the patents, all to utilize the present invention
Equivalent structure transformation made by specification and accompanying drawing content is directly or indirectly used in other related technical areas, similarly
It is included within the scope of the present invention.
Claims (8)
1. a kind of CAE design method of pre-parsed boundary condition includes the following steps: to construct model, pre-treatment, finite element fraction
Analysis, post-processing, adjusted design, actual production test；It is characterized in that, further including pre- between the preceding processing and finite element analysis
The step of dissection process, the pre-parsed processing further comprises following steps:
Step 1: for boundary condition, described for boundary condition includes boundary condition identifier and boundary condition parameter for setting；
Step 2: identifying the boundary condition identifier, and transfer corresponding boundary condition identity symbol from condition resolution library according to it
Parsing scheme；
Step 3: set boundary condition parameter being solved using the parsing scheme；
Step 4: the solution acquired is patterned expression；
Step 5: according to model constructed by the modified result of the graphic representation.
2. a kind of CAE design method of pre-parsed boundary condition as described in claim 1, it is characterised in that: described for side
Boundary's condition is torque, surface pressure, force per unit length, acceleration, centrifugal force, default temperature load, node temperature load, node temperature
One of heat transmitting, the transmitting of concurrent condition heat, the transmitting of heat stream heat, Level Set method；The boundary condition identifier corresponds to
It is above-mentioned respectively for boundary condition.
3. a kind of CAE design method of pre-parsed boundary condition as claimed in claim 2, it is characterised in that: the perimeter strip
Part parameter includes boundary value and parameter value；The boundary value is boundary node set, and several boundaries comprising being set as boundary are saved
The position of point.
4. a kind of CAE design method of pre-parsed boundary condition as claimed in claim 3, it is characterised in that: the parsing side
Case is static force analysis method, kinematic analysis method, thermal-stress analysis method, hot fluid simulation analysis method；
Wherein, the static force analysis method corresponds to the torque, surface pressure, force per unit length etc. for boundary condition；The power point
Analysis method corresponds to the acceleration, centrifugal force etc. for boundary condition；The thermal-stress analysis method correspond to the default temperature load,
Node temperature load, the transmitting of node temperature heat etc. are for boundary condition；The hot fluid simulation analysis method corresponds to the convection current item
The transmitting of part heat, the transmitting of heat stream heat, Level Set method etc. are for boundary condition.
5. a kind of CAE design method of pre-parsed boundary condition as claimed in claim 4, it is characterised in that: apply the solution
Before analysing Scheme Solving, the boundary value and parameter value are introduced；The solution acquired be on each boundary node it is corresponding accordingly for
The numerical solution of boundary condition type.
6. a kind of CAE design method of pre-parsed boundary condition as claimed in claim 5, it is characterised in that: pass through computer
Graph technology is patterned processing to the solution acquired, to realize the graphic representation in step 4.
7. a kind of CAE design method of pre-parsed boundary condition as claimed in claim 6, it is characterised in that: the computer
Graph technology is the 3 D image drawing technology based on MFC.
8. a kind of CAE design method of pre-parsed boundary condition as claimed in claim 6, it is characterised in that: in steps of 5,
According to the graphic representation obtained in step 4 as a result, and combine inherent constraint, correct constructed model, make its without departing from
The inherent constraint；The inherent constraint includes material load constraint, temperature range constraint, spatial position constraint.
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| CN107742042A (en) * | 2017-10-30 | 2018-02-27 | 江苏银基烯碳能源科技有限公司 | A kind of CAE emulation preprocessing systems and method |
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| JPH0512386A (en) * | 1991-07-02 | 1993-01-22 | Hitachi Ltd | Cae system |
| JP2004326296A (en) * | 2003-04-23 | 2004-11-18 | Hitachi Ltd | Analytic model creation support system |
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