CN109033601B - CAE design method for pre-analyzing boundary conditions - Google Patents
CAE design method for pre-analyzing boundary conditions Download PDFInfo
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- CN109033601B CN109033601B CN201810788415.8A CN201810788415A CN109033601B CN 109033601 B CN109033601 B CN 109033601B CN 201810788415 A CN201810788415 A CN 201810788415A CN 109033601 B CN109033601 B CN 109033601B
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Abstract
The invention discloses a CAE design method for pre-analyzing boundary conditions, which also comprises a pre-analyzing treatment step between the steps of pre-treatment and finite element analysis, and further comprises the following steps: setting an expected boundary condition, wherein the expected boundary condition comprises a boundary condition identifier and a boundary condition parameter; identifying the boundary condition identifier, and calling an analysis scheme corresponding to the boundary condition identifier from a conditional analysis library according to the boundary condition identifier; solving the set boundary condition parameters by using the analysis scheme; graphically expressing the obtained solution; and correcting the constructed model according to the result of the graphical expression. Based on the technical scheme of the invention, a designer can quickly and quickly adjust the product design, so that the time for waiting for the parameter adjustment and iterative operation process and time is not needed to be spent, and higher design efficiency is realized.
Description
Technical Field
The invention relates to the technical field of CAE design and analysis, in particular to a CAE design method for pre-analyzing boundary conditions.
Background
When the CAE software or method is applied to perform performance analysis and simulation on a project or a product, the following three processes are generally performed: (1) pretreatment: solid modeling and parametric modeling, boolean operation of components, automatic subdivision of units, automatic node numbering and automatic node parameter generation, direct input of load and material parameters, formula parametric import, automatic node load generation, automatic finite element model information generation and the like; (2) finite element analysis: the system comprises a finite element library, a material library and related algorithms, a constraint processing algorithm, a finite element system assembly module and a static force, dynamic force, vibration, linear and nonlinear solution library; (3) post-treatment: and providing the finite element analysis result to a user in a graphical mode, and assisting the user in judging the reasonability of the calculation result and the design scheme.
And (4) examining the problem points of the product according to the post-processing result by a user, returning to the model reconstruction and the pre-processing to adjust the product design, and repeatedly carrying out the simulation test process until the design requirement is met and then carrying out mass production. Therefore, specific information of boundary conditions set in pretreatment on nodes/finite elements cannot be visually seen, and more times of simulation tests are needed when product design is adjusted, so that research and development efficiency is influenced; moreover, for the primary designer, due to the lack of experience, it is often unknown how to adjust the design parameters in the correct direction, and more simulation tests are required, which takes a lot of time to adjust the product meeting the design requirements.
How to provide a fast CAE design product or method that can assist designers in quickly adjusting product design is a problem to be solved in the art.
Disclosure of Invention
The invention aims to provide a faster CAE design method which can assist designers to quickly adjust product design, so that designers do not need to spend more time waiting for the process and time of parameter adjustment and iterative operation, and higher design efficiency is realized.
In order to achieve the above object, the present invention provides a CAE design method for pre-analyzing boundary conditions, comprising the following steps: constructing a model, preprocessing, finite element analysis, post-processing, adjusting and designing and actual production test; the method also comprises a step of pre-analysis processing between the pretreatment and the finite element analysis, and the pre-analysis processing further comprises the following steps:
step 1: setting an expected boundary condition, wherein the expected boundary condition comprises a boundary condition identifier and a boundary condition parameter;
and 2, step: identifying the boundary condition identifier, and calling an analysis scheme corresponding to the boundary condition identifier from a condition analysis library according to the boundary condition identifier;
and step 3: solving the set boundary condition parameters by using the analysis scheme;
and 4, step 4: graphically expressing the obtained solution;
and 5: and correcting the constructed model according to the result of the graphical expression.
In one possible embodiment: the boundary condition to be known is one of moment, surface pressure, line distribution force, acceleration, centrifugal force, default temperature load, node temperature heat transfer, convection condition heat transfer, heat flow stream heat transfer and virtual fluid; the boundary condition identifier corresponds to each of the aforementioned desired boundary conditions.
In one possible embodiment: the boundary condition parameters comprise boundary values and parameter values; the boundary value is a set of boundary nodes, containing the positions of a number of boundary nodes set as boundaries.
In one possible embodiment: the analysis scheme is a static analysis method, a dynamic analysis method, a thermal stress analysis method and a thermal fluid simulation analysis method;
wherein, the static analysis method is corresponding to the known boundary conditions such as the moment, the surface pressure, the line distribution force and the like; the dynamic analysis method corresponds to the expected boundary conditions such as the acceleration, the centrifugal force and the like; the thermal stress analysis method corresponds to the default temperature load, the node temperature heat transfer and other desired boundary conditions; the hot fluid simulation analysis method corresponds to the expected boundary conditions such as convection condition heat transfer, heat flow stream heat transfer, virtual fluid and the like.
In one possible embodiment: before the analytic scheme is applied to solving, introducing the boundary value and the parameter value; the obtained solution is a numerical solution corresponding to the corresponding to-be-known boundary condition type on each boundary node.
In one possible embodiment: and carrying out graphical processing on the obtained solution through a computer graphics technology so as to realize graphical expression in the step 4.
In one possible embodiment: the computer graphics technology is a MFC-based three-dimensional graphics rendering technology.
In one possible embodiment: in step 5, according to the result of the graphical expression obtained in step 4 and in combination with the inherent constraint, the constructed model is corrected so as not to exceed the inherent constraint; the intrinsic constraints include material loading constraints, temperature range constraints, and spatial position constraints.
In the traditional CAE design method, a plurality of boundary condition operations must be integrated, whether the constructed model has problems can be known only by obtaining the post-processing result, and a designer is difficult to know where the constructed model has defects according to a calculation structure, so that the research and development efficiency is low. After the steps are applied, the design method of the invention provides a CAE design method with a pre-analysis processing step, which calls a universal analysis algorithm according to boundary condition identifiers, calculates corresponding information of constructed models under given boundary conditions, enables designers to know the existing defects of product design under the boundary conditions, adjusts the product design according to the single boundary conditions, namely parameters of the constructed models, achieves the effect of refining the adjustment direction, further enables each step of adjustment in product design to have a more definite adjustment direction, and enables designers to quickly obtain the optimal design of various boundary conditions meeting the corresponding product requirements by integrating the adjustment directions presented by various boundary conditions, constructs the corresponding optimal models and overcomes the defects in the traditional CAE design method.
Drawings
FIG. 1 shows a schematic flow diagram of a method provided by the present invention;
FIG. 2 shows a schematic boundary condition diagram of example 1;
FIG. 3 shows a schematic diagram of the parsed graphical representation of example 1;
FIG. 4 shows a schematic boundary condition diagram of example 2;
FIG. 5 shows a schematic diagram of the parsed graphical representation of example 2.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings. Referring to fig. 1, fig. 1 shows a schematic flow chart of a CAE design method for pre-analyzing boundary conditions according to the present invention, which includes the following steps: the method comprises the steps of model building, pretreatment, finite element analysis, post-treatment, design adjustment and actual production test.
Particularly, in the present invention, a pre-analysis processing step is further included between the pre-processing step and the finite element analysis step, and specifically, the pre-analysis processing step further includes the following steps:
step 1: setting an expected boundary condition, wherein the expected boundary condition comprises a boundary condition identifier and a boundary condition parameter;
step 2: identifying the boundary condition identifier, and calling an analysis scheme corresponding to the boundary condition identifier from a condition analysis library according to the boundary condition identifier;
and 3, step 3: solving the set boundary condition parameters by using the analysis scheme;
and 4, step 4: graphically expressing the obtained solution;
and 5: and correcting the constructed model according to the result of the graphical expression.
In the traditional CAE design method, a plurality of boundary condition operations must be integrated, whether the constructed model has problems can be known only by obtaining the post-processing result, and a designer is difficult to know where the constructed model has defects according to a calculation structure, so that the research and development efficiency is low. After the steps are applied, the design method of the invention provides a CAE design method with a pre-analysis processing step, which calls a universal analysis algorithm according to boundary condition identifiers, calculates corresponding information of constructed models under given boundary conditions, enables designers to know the existing defects of product design under the boundary conditions, adjusts the product design according to the single boundary conditions, namely parameters of the constructed models, achieves the effect of refining the adjustment direction, further enables each step of adjustment in product design to have a more definite adjustment direction, and enables designers to quickly obtain the optimal design of various boundary conditions meeting the corresponding product requirements by integrating the adjustment directions presented by various boundary conditions, constructs the corresponding optimal models and overcomes the defects in the traditional CAE design method.
Specifically, the types of boundary conditions to be known in step 1 include moment, surface pressure, line distribution force, acceleration, centrifugal force, default temperature load, node temperature heat transfer, convection condition heat transfer, heat flux heat transfer, and virtual fluid. When setting, the boundary condition to be known is one of the boundary conditions, and the boundary condition identifier corresponds to each boundary condition to be known.
Besides the boundary condition identifier, the input of the designer also comprises boundary condition parameters, wherein the boundary condition parameters comprise boundary values and parameter values, and the parameter values are the parameter values of the corresponding boundary conditions; the boundary value is a set of boundary nodes on the preprocessed model, and includes positions of a plurality of boundary nodes set as boundaries.
In the step 2 and the step 3, the analysis scheme is a static analysis method, a dynamic analysis method, a thermal stress analysis method and a thermal fluid simulation analysis method. The methods are stored in the conditional analysis library and respectively have corresponding analysis ranges which correspond to certain types of boundary conditions to be known, and only the corresponding analysis scheme is required to be called from the conditional analysis library according to the boundary condition identifier.
The static force analysis method is corresponding to the known boundary conditions such as the torque, the surface pressure, the line distribution force and the like; the dynamic analysis method corresponds to the expected boundary conditions such as the acceleration, the centrifugal force and the like; the thermal stress analysis method corresponds to the default temperature load, the node temperature heat transfer and other expected boundary conditions; the thermal fluid simulation analysis method corresponds to the expected boundary conditions such as convection condition heat transfer, heat flow stream heat transfer, virtual fluid and the like. The static force analysis method also comprises a corresponding torque analysis scheme, a surface pressure analysis scheme, a line distribution force analysis scheme and the like, and other similar principles are omitted for brevity.
Before applying the analytical solution to solve, the boundary values and parameter values need to be introduced. After step 3, the obtained solution is a numerical solution corresponding to the corresponding to-be-known boundary condition type on each boundary node.
Further, the embodiment of the present invention performs a graphic processing on the obtained solution by using a computer graphics technology to implement the graphic expression in step 4. In particular, the computer graphics technology may be a MFC-based three-dimensional graphics rendering technology. The constructed model and the obtained numerical solution of the corresponding boundary condition are imported, and a corresponding calculation result graph is drawn according to an internal algorithm for the reference of designers.
In step 5, the built model is modified according to the graphical representation result obtained in step 4 and combined with the inherent constraint so as not to exceed the inherent constraint. The inherent constraints are material load constraints, temperature range constraints, spatial position constraints, etc., which are mainly contributors to certain external inherent limitations. After the analysis result of the graphical expression is given, the adjustment is performed by mainly depending on the knowledge ability and the design experience of the designer, but the difficulty is still much simpler and more convenient than that of the conventional technology.
Specific embodiments of the present invention are described below in conjunction with fig. 2-5.
Example 1
Referring to fig. 2-3, the present embodiment takes a simulation analysis of an automobile frame as an example, when the automobile runs, the frame is subjected to various loads, including various complex dynamic stresses and thermal stresses that may be generated during the running process, in addition to the weight of the automobile itself.
By applying the CAE design method, whether the frame design is adjusted in a reasonable direction can be judged by confirming the action effect of a single load on the target pivot after the frame design is adjusted, so that unnecessary simulation test processes are reduced, and the design efficiency is improved.
Specifically, the position corresponding to the target fulcrum is identified by a node position, in fig. 2, the positions of a plurality of boundary nodes representing boundary values are represented by solid black dots, correspondingly, the parameter value is 10000.00N corresponding to the boundary condition type of the line distribution force, a corresponding line distribution force analysis method included in the static force analysis method is called, and the solved solution is shown in fig. 3, which clearly shows the solved graphical expression result, and the action effect of the set load on the corresponding target fulcrum and each corresponding boundary node after the preprocessing can be seen. The designer can more clearly and directionally correct and adjust the constructed model according to the result shown in fig. 3 and the allowable stress, maximum load and other parameters of the material.
Example 2
Referring to fig. 4-5, the present embodiment is an embodiment in which the boundary condition type is a face pressure, and the boundary condition parameters include boundary values and parameter values. All nodes within the range enclosed by the solid black dots in fig. 4 represent the corresponding boundary nodes, thereby representing the boundary values, and the corresponding parameter values are 10000.00N corresponding to the boundary condition type face pressure.
Specifically, the acting object of the surface pressure in fig. 4 is the acting range of the whole boundary value, the magnitude of the surface pressure is known, and the corresponding finite element area can be obtained according to the coordinates of each node after the finite element segmentation is performed on the model in the preprocessing step, so as to obtain the stress value on each finite element. After the corresponding analysis scheme of the surface distribution force is called for solving, the graphical expression result is shown in fig. 5, and the stress value of each node under the load is clearly shown. The designer can more clearly and directionally correct and adjust the constructed model according to the result shown in fig. 5 and the allowable stress, maximum load and other parameters of the material.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and the same shall be included in the scope of the present invention.
Claims (5)
1. A CAE design method for pre-analyzing boundary conditions comprises the following steps: constructing a model, preprocessing, finite element analysis, post-processing, adjusting and designing and actual production test; the method is characterized by also comprising a step of pre-analysis processing between the pretreatment and the finite element analysis, wherein the pre-analysis processing further comprises the following steps:
step 1: setting an expected boundary condition, wherein the expected boundary condition comprises a boundary condition identifier and a boundary condition parameter;
and 2, step: identifying the boundary condition identifier, and calling an analysis scheme corresponding to the boundary condition identifier from a condition analysis library according to the boundary condition identifier;
and step 3: solving the set boundary condition parameters by using the analysis scheme;
and 4, step 4: graphically expressing the obtained solution;
and 5: correcting the constructed model according to the result of the graphical expression;
wherein the boundary condition to be known is one of moment, surface pressure, line distribution force, acceleration, centrifugal force, default temperature load, node temperature heat transfer, convection condition heat transfer, heat flow stream heat transfer and virtual fluid; the boundary condition identifier corresponds to each boundary condition to be known; the boundary condition parameters comprise boundary values and parameter values; the boundary value is a boundary node set and comprises positions of a plurality of boundary nodes set as boundaries; the analysis scheme is a static analysis method, a dynamic analysis method, a thermal stress analysis method and a thermal fluid simulation analysis method;
wherein the boundary conditions to be known corresponding to the static analysis method comprise the moment, the surface pressure and the line distribution force; the boundary conditions to be known corresponding to the dynamic analysis method comprise the acceleration and the centrifugal force; the expected boundary conditions corresponding to the thermal stress analysis method comprise the default temperature load, the node temperature load and the node temperature heat transfer; the expected boundary conditions corresponding to the thermal fluid simulation analysis method comprise the convection condition heat transfer, the heat stream heat transfer and the virtual fluid.
2. The CAE design method for pre-resolving boundary conditions as claimed in claim 1, wherein: before the analysis scheme is applied to solve, introducing the boundary value and the parameter value; the obtained solution is a numerical solution corresponding to the corresponding to-be-known boundary condition type on each boundary node.
3. The CAE design method for pre-resolving boundary conditions as claimed in claim 2, wherein: and performing graphical processing on the obtained solution through a computer graphics technology to realize graphical expression in the step 4.
4. A CAE design method for pre-resolving boundary conditions as claimed in claim 3, wherein: the computer graphics technology is a MFC-based three-dimensional graphics rendering technology.
5. A CAE design method for pre-resolving boundary conditions as claimed in claim 3, wherein: in step 5, according to the result of the graphical expression obtained in step 4 and in combination with the inherent constraint, the constructed model is corrected so as not to exceed the inherent constraint; the inherent constraints include material load constraints, temperature range constraints, spatial position constraints.
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