CN112231838A - Method for establishing body-in-white model - Google Patents
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Abstract
The invention provides a method for building a body-in-white model, which comprises the following steps of S1, determining key hard point coordinates and a base line in the body-in-white of a new vehicle type; step S2, dividing the parameter data of the white body of the new vehicle into a plurality of local module data, and judging whether the local module data is the same as or similar to the first module data one by one; step S3, using database management table to search whether the same or similar second module data exists in the module data of other vehicle type in database; the same or similar local module data is not found in the database, and independent modeling is carried out according to the parameter data of the body-in-white of the new vehicle type and the data is stored in the database; and step S4, assembling all the modules of the white body of the obtained new vehicle type to complete the creation of the white body model. The invention shortens the development cycle of the vehicle type of an enterprise, reduces the design cost and improves the product competitiveness; the white car body model is high in accuracy, and repeated design work is reduced.
Description
Technical Field
The invention relates to the technical field of vehicle body structure design, in particular to a method for establishing a body-in-white model.
Background
At present, in the automobile industry, the development of a new vehicle type white body often requires an engineer to perform modeling work in CAD software from scratch in a concept design stage, a product concept design scheme is determined only through the experience of the engineer, an obtained white body geometric model needs a large amount of geometric cleaning work before finite element analysis is performed, and a created CAE (COMPUTER AIDED ENGINEERING, COMPUTER aided engineering in engineering design) model has no reusability. The reasons are that a great deal of geometric and CAE (COMPUTER aided engineering) model modification work is caused in the concept design stage, and the problems of development cost rise and design cycle extension are caused. How to quickly establish a high-precision target body-in-white model in a concept design stage and realize that a CAE (COMPUTER AIDED ENGINEERING, COMPUTER aided engineering in engineering design) model makes quick response to the change of a CAD model is a difficult point in the field of automobile body design and is also an important reason that the development period of mainstream automobile designers is long at present.
For example, in patent CN1851754, a method for quickly establishing a car body concept design geometric model is disclosed, in which a VCD car body concept design system is established on a UG NX 5.0 platform by using a C language secondary development tool. The method utilizes the coordinates of key hard points in the vehicle body structure to realize the parametric modification of the geometric model, and uses simple lines and surfaces to respectively simulate a beam structure and a plate structure. The time for modifying and adjusting the model is reduced by establishing templates of different vehicle types, and a database of detailed sections is established for calling the beam unit. In the system, a white body conceptual model consisting of points, lines and surfaces can be obtained through simple parameter adjustment.
Wherein the existence of deficiencies includes: the simulation of the geometric structure of the car body is carried out by adopting simple points, lines and surfaces, and the model precision is poor; the old version UG NX 5.0 is developed and built for the second time, cannot be used on the latest version software, and is very limited in application range.
Disclosure of Invention
The technical problem solved by the embodiment of the invention is that in the vehicle concept design stage, the problems of too long research and development time, high cost and too long time consumption for repeated development of the original vehicle body structure exist in the prior art.
In one aspect of the invention, a method of building a body-in-white model is provided, comprising:
step S1, acquiring parameter data of a new vehicle type white body, determining key hard point coordinates and a base line in the new vehicle type white body, and taking the key hard point coordinates and the base line as adjusted reference parameters;
step S2, dividing parameter data of a white body of a new vehicle type into a plurality of local module data, comparing the local module data with first module data of the same vehicle type in a module database, judging whether the local module data are the same as or similar to the first module data one by one, if the local module data are the same as or similar to the first module data, calling the first module data and carrying out adaptive modification on the first module data, and if the local module data are not the same as or similar to the first module data, marking the local module data as incapable of being used;
step S3, according to the local module data which can not be used, using a database management table to search whether the module data of other vehicle types in the database has the second module data which is the same as or similar to the local module data which can not be used, if yes, obtaining the same or similar second module data, and carrying out adaptive modification on the second module data; if the parameter data does not exist, performing independent modeling according to the parameter data of the white vehicle body of the new vehicle type and storing the parameter data into a database;
and step S4, assembling all the modules of the white body of the obtained new vehicle type to complete the creation of the white body model.
The method further comprises the steps of checking the model according to the generated finite element model and the performance analysis result, judging whether the built white body model of the new vehicle type has the condition of interference or incomplete connection, if so, judging that the white body model of the new vehicle type has error information, deleting corresponding error information in the white body model of the new vehicle type until no error information exists in the white body model of the new vehicle type, and obtaining various performance indexes of the white body of the new vehicle type.
Further, in step S1, the parameter data of the body-in-white of the new vehicle type specifically includes: the method comprises the following steps of vehicle model external modeling data, man-machine data, door opening line data, tire envelope data, key joint data and layout data of key beams.
Further, in step S2, the specifically determining whether the local module data and the first module data are the same or similar one by one includes: determining an outer modeling envelope surface according to the vehicle model outer modeling data, the door opening line data and the tire envelope data; and determining the interior design boundary of the vehicle body according to the man-machine data, the joint data and the beam layout data.
Further, step S2 specifically includes: judging from the similarity degree of the vehicle type edge rate, the outer modeling envelope surface and the vehicle body internal design boundary, when the similarity degree of at least one of the vehicle type edge rate, the outer modeling envelope surface and the vehicle body internal design boundary is high, judging that the local module data is similar to the first module data, and calling the first module data and carrying out adaptive modification on the first module data; when the vehicle type edge rate, the outer modeling envelope surface and the vehicle body inner design boundary are the same, judging that the local module data is the same as the first module data, calling the first module data and carrying out adaptive modification on the first module data; and when the vehicle type edge rate, the external modeling envelope surface and the similarity in the vehicle body internal design boundary are simultaneously low, judging that the local module data is not the same as or similar to the first module data, and marking the local module data as unavailable.
Further, step S3 specifically includes: calling module data of other vehicle types in a database through a database management table, comparing the module data with the local module data which cannot be used, judging the similarity degree of an outer modeling envelope surface and a vehicle body inner design boundary, and calling and adaptively modifying the second module data when the similarity degree of at least one of the outer modeling envelope surface and the vehicle body inner design boundary is high and the local module data is judged to be similar to the second module data; and when the outer modeling envelope surface and the inner design boundary of the vehicle body are the same, judging that the local module data is the same as the second module data, calling the second module data and carrying out adaptive modification on the second module data.
Further, step S4 specifically includes: and performing point-to-point adjustment on a base point of the white body of the new vehicle type by taking the key hard point coordinates and the base line as reference parameters, adjusting the structure of the vehicle type to be designed according to the curvature of the base line, and modifying the section of a butt beam by adjusting the position of the node to obtain the structural relationship of the white body model of the new vehicle type.
Further, step S4 specifically includes: and according to the structural relationship of the white body model of the new vehicle type, assembling local modules through the cross section of the pair beam, the base line and the key hard points in a software environment to form the white body model of the new vehicle type.
In summary, the embodiment of the invention has the following beneficial effects:
the method for establishing the body-in-white model is assembled based on the existing vehicle model modules, and only module assembly and parametric adjustment work need to be completed, so that the vehicle model development cycle of an enterprise is shortened, the design cost is reduced, and the product competitiveness is improved; the white body model is high in accuracy, main performance indexes of the body can be comprehensively reflected, geometric data can be referred to in a detailed design stage, and repeated design work is reduced; the CAE model for finite element analysis can be generated quickly and is in seamless butt joint with integrated optimization software, and model preparation time in the prior structure optimization process is saved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic main flow chart of a method for building a body-in-white model according to the present invention.
FIG. 2 is a schematic diagram of a dotted line topology of the method of building a body-in-white model according to the present invention.
Fig. 3 is a schematic introduction diagram of the first module of the method for building a body-in-white model according to the present invention.
Fig. 4 is a schematic diagram of the second module import of the method for building a body-in-white model according to the present invention.
FIG. 5 is a schematic view of a body-in-white model of a new vehicle model according to the method for building the body-in-white model of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an embodiment of a method for building a body-in-white model according to the present invention. In this embodiment, the method comprises the steps of:
step S1, acquiring parameter data of a new vehicle type white body, determining key hard point coordinates and a base line in the new vehicle type white body, and taking the key hard point coordinates and the base line as adjusted reference parameters;
in a specific embodiment, the parameter data of the new vehicle type white body specifically includes: the method comprises the following steps of (1) vehicle type external modeling data, man-machine data, door opening line data, tire envelope data, joint data and beam layout data; as shown in fig. 2, the white body point-line topology can be determined according to the early-stage parameters such as the exterior shape of the new vehicle, human-computer data, the door opening line, the tire envelope, the layout of the key joints and the key beams, and the like, and the key hard point coordinates and the base line form in the white body can be further determined.
Step S2, as shown in FIG. 3, determining a structure module which can be used continuously or has small change in the body-in-white of the original vehicle type according to the edge rate target of the new vehicle type, the outer modeling envelope surface, the inner design boundary of the vehicle body and the like, importing the structure module from a modular database, and modifying the part needing to be modified; dividing parameter data of a white body of a new vehicle type into a plurality of local module data, comparing the local module data with first module data of the same vehicle type in a module database, judging whether the local module data is the same as or similar to the first module data one by one, if the local module data is the same as or similar to the first module data, calling the first module data and carrying out adaptive modification on the first module data, and if the local module data is not the same as or similar to the first module data, marking the local module data as incapable of being used;
in a specific embodiment, an outer modeling envelope surface is determined according to the vehicle model outer modeling data, the door opening line data and the tire envelope data; determining an interior design boundary of the vehicle body according to the man-machine data, the joint data and the beam layout data;
judging similarity degrees of a vehicle type edge rate, the outer modeling envelope surface, the vehicle body internal design boundary and the like, judging that the local module data is similar to the first module data when the similarity degree of at least one of the vehicle type edge rate, the outer modeling envelope surface, the vehicle body internal design boundary and the like is high, and calling the first module data and carrying out adaptive modification on the first module data; when the vehicle type edge rate, the outer modeling envelope surface, the vehicle body inner design boundary and the like are the same, judging that the local module data is the same as the first module data, calling the first module data and carrying out adaptive modification on the first module data; and when the similarity of several items in the vehicle type following rate, the outer modeling envelope surface, the vehicle body internal design boundary and the like is low at the same time, judging that the local module data is not the same as or similar to the first module data, and marking the local module data as unavailable.
Step S3, as shown in FIG. 4, preferentially selecting and utilizing the database to search the modules of other vehicle types in the database for the modules which are the same as or similar to the body-in-white structure of the new vehicle type, preferentially calling the modules of other vehicle types, and determining the parts needing to be modified; according to the local module data which cannot be used, a database management table is utilized to search whether second module data which are the same as or similar to the local module data which cannot be used exist in the module data of other vehicle types in the database, if so, the same or similar second module data are obtained, and the second module data are adaptively modified; if the parameter data does not exist, performing independent modeling according to the parameter data of the white vehicle body of the new vehicle type and storing the parameter data into a database;
in a specific embodiment, module data of other vehicle types in a database is called through a database management table, the module data is compared with the local module data which cannot be used, the similarity degree of the outer modeling envelope surface and the design boundary inside the vehicle body is judged, when the similarity degree of at least one item in the outer modeling envelope surface and the design boundary inside the vehicle body is high, the local module data is judged to be similar to the second module data, and the second module data is called and is modified adaptively; and when the outer modeling envelope surface and the inner design boundary of the vehicle body are the same, judging that the local module data is the same as the second module data, calling the second module data and carrying out adaptive modification on the second module data.
The method comprises the following steps of (1) independently modeling and storing the parameters of the existing development target, the outer modeling envelope surface, the inner design boundary of a vehicle body and the like of a new vehicle type into a database according to the parameters of the existing development target, the outer modeling envelope surface, the inner design boundary of the vehicle body and the like of the new vehicle type, wherein the local module data which are the same or similar are not found in the database; when a new vehicle model is developed, structural forms which are not contained in the database may be encountered, or the structural forms need to be modified greatly, and in this case, the selection of individual creation is more convenient, and the database can be stored for supplement and enrichment.
Step S4, assembling all modules of the obtained new vehicle type body in white to complete the creation of a body in white model; the base line and the key hard points can be assembled according to the key hard point coordinates and the base line, and the creation of a white body model of the new vehicle type is completed;
in the specific embodiment, parameters such as a base point coordinate, a base line curvature and a section form in the model are modified according to an external modeling envelope surface, an internal design boundary of the vehicle body, man-machine data, the key hard point coordinate and the base line as reference parameters to approach a target white vehicle body model; point-to-point adjustment is carried out on the base point of the white body of the new vehicle type, the structure of the vehicle type to be designed is adjusted according to the curvature of the base line, the curvature of the base line is matched with the existing data of the vehicle body structure, the cross section of a beam is modified by adjusting the position of the node, the parameterized adjustment of the white body structure is realized, and the structural relation of the white body model of the new vehicle type is obtained;
as shown in fig. 5, according to the structural relationship of the body-in-white model of the new vehicle, the assembly among the local modules is performed through the cross section of the pair of beams, the base line and the key hard point under the SFE connect software environment, so as to form the body-in-white model of the new vehicle.
In the embodiment of the invention, the model is checked according to the generated finite element model and the performance analysis result, whether the built white body model of the new vehicle type has the condition of interference or incomplete connection or not is judged, if the condition of interference or incomplete connection exists, the white body model of the new vehicle type is judged to have error information, the corresponding error information in the white body model of the new vehicle type is deleted until the error information does not exist in the white body model of the new vehicle type, and various performance indexes of the white body of the new vehicle type are obtained.
In summary, the embodiment of the invention has the following beneficial effects:
the method for establishing the body-in-white model is assembled based on the existing vehicle model modules, only module assembly and parametric adjustment work are needed to be completed, the vehicle model development period of an enterprise is shortened, the design cost is reduced, the product competitiveness is improved, and the design time and the development cost required in the concept design stage are obviously reduced; the white body model is established with high precision, the error of the main performance is controlled within 10 percent, the analysis requirement of the body performance of the product in the early development stage is met, the main performance index of the body can be comprehensively reflected, the geometric data can be referred to in the detailed design stage, and the repeated design work is reduced; the CAE model for finite element analysis can be generated quickly and is in seamless butt joint with integrated optimization software, and model preparation time in the prior structure optimization process is saved.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (8)
1. A method of building a body-in-white model, comprising the steps of:
step S1, acquiring parameter data of a new vehicle type white body, determining key hard point coordinates and a base line in the new vehicle type white body, and taking the key hard point coordinates and the base line as adjusted reference parameters;
step S2, dividing parameter data of a white body of a new vehicle type into a plurality of local module data, comparing the local module data with first module data of the same vehicle type in a module database, judging whether the local module data are the same as or similar to the first module data one by one, if the local module data are the same as or similar to the first module data, calling the first module data and carrying out parameterization modification on the first module data, and if the local module data are not the same as or similar to the first module data, marking the local module data as incapable of being used;
step S3, according to the local module data which can not be used, using a database management table to search whether the module data of other vehicle types in the database has the second module data which is the same as or similar to the local module data which can not be used, if yes, obtaining the same or similar second module data, and carrying out adaptive modification on the second module data; if the parameter data does not exist, performing independent modeling according to the parameter data of the white vehicle body of the new vehicle type and storing the parameter data into a database;
and step S4, assembling all the modules of the white body of the obtained new vehicle type to complete the creation of the white body model.
2. The method of claim 1, further comprising checking the model according to the generated finite element model and the performance analysis result, judging whether the built white body model of the new vehicle type has interference or incomplete connection, if so, judging that the white body model of the new vehicle type has error information, deleting corresponding error information in the white body model of the new vehicle type until no error information exists in the white body model of the new vehicle type, and obtaining various performance indexes of the white body of the new vehicle type.
3. The method according to claim 2, characterized in that in step S1, the parameter data of the new vehicle type body in white specifically comprises: the vehicle model external modeling data, the man-machine data, the door opening line data, the tire enveloping data, the joint data and the beam layout data.
4. The method according to claim 3, wherein in step S2, the determining whether the local module data and the first module data are the same or similar one by one specifically includes: determining an outer modeling envelope surface according to the vehicle model outer modeling data, the door opening line data and the tire envelope data; and determining the interior design boundary of the vehicle body according to the man-machine data, the joint data and the beam layout data.
5. The method according to claim 4, wherein the step S2 specifically includes:
judging from the vehicle type edge rate, the outer modeling envelope surface and the similarity degree of the vehicle body internal design boundary, and when the similarity degree of at least one of the vehicle type edge rate, the outer modeling envelope surface and the vehicle body internal design boundary is high, judging that the local module data is similar to the first module data, and calling and carrying out parameterized modification on the first module data;
when the vehicle type edge rate, the outer modeling envelope surface and the vehicle body inner design boundary are the same, judging that the local module data is the same as the first module data, and calling and adaptively modifying the first module data;
and when the vehicle type edge rate, the external modeling envelope surface and the similarity in the vehicle body internal design boundary are simultaneously low, judging that the local module data is not the same as or similar to the first module data, and marking the local module data as unavailable.
6. The method according to claim 5, wherein step S3 specifically comprises:
calling module data of other vehicle types in a database through a database management table, comparing the module data with the local module data which cannot be used, judging the similarity degree of the outer modeling envelope surface and the vehicle body internal design boundary, and calling and adaptively modifying the second module data when the similarity degree of at least one of the outer modeling envelope surface and the vehicle body internal design boundary is high and the local module data is judged to be similar to the second module data;
and when the outer modeling envelope surface and the inner design boundary of the vehicle body are the same, judging that the local module data is the same as the second module data, calling the second module data and carrying out adaptive modification on the second module data.
7. The method according to claim 6, wherein the step S4 specifically includes:
and performing point-to-point adjustment on the base point of the white body of the new vehicle type by taking the key hard point coordinates and the base line as reference parameters, adjusting the structure of the vehicle type to be designed according to the curvature of the base line, and modifying the size and the shape of the section of the beam by adjusting the position of the node to obtain the structural relationship of the white body model of the new vehicle type.
8. The method of claim 7, wherein the step S4 further comprises:
and according to the structural relationship of the white body model of the new vehicle type, assembling local modules on the cross section of the beam, the base line and the key hard points in a software environment to form the white body model of the new vehicle type.
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