CN112883486A - Intelligent design method for passenger car body based on CATIA knowledge engineering - Google Patents
Intelligent design method for passenger car body based on CATIA knowledge engineering Download PDFInfo
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- CN112883486A CN112883486A CN202110105950.0A CN202110105950A CN112883486A CN 112883486 A CN112883486 A CN 112883486A CN 202110105950 A CN202110105950 A CN 202110105950A CN 112883486 A CN112883486 A CN 112883486A
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- parting line
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/15—Vehicle, aircraft or watercraft design
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
Abstract
The invention discloses a passenger car body intelligent design method based on CATIA knowledge engineering, relating to the technical field of CATIA knowledge engineering and comprising the following steps: based on the model and profile inputs, a preliminary examination is performed, with the side and tail door hinges and hinge axes defined afterwards. And defining a side door and a tail door opening line, establishing a body-in-white assembly, an opening and closing part assembly and a connecting assembly model, including three-dimensional size marking, and performing motion analysis. According to the invention, the target model is input into the model elements preset by the replacement system, the automatic modeling design of the vehicle body system is realized, the CATIA knowledge engineering method is adopted, the implicit vehicle body development knowledge is contained, the non-frame member system of the passenger vehicle body is rapidly designed and developed through the full-parameter association design of the CATIA, almost all artificial design errors can be avoided, the cost reduction and the speed increase of the whole vehicle development are realized, the development period is shortened, and a large amount of development resources are saved.
Description
Technical Field
The invention relates to the technical field of CATIA knowledge engineering, in particular to an intelligent design method for a passenger car body based on CATIA knowledge engineering.
Background
With the development of social economy, the quality and diversity of automobile products in the market are increasingly demanded, and automobile (especially passenger cars) production enterprises are required to improve the design and development quality and accelerate the product development speed. At present, the research and development investment of domestic vehicle enterprises is generally increased, a plurality of vehicle types are researched and developed simultaneously, and the research and development period is shortened to rob the market.
The development of the vehicle body is an important part of autonomous research and development of a host factory of a passenger vehicle, and the non-frame member of the vehicle body is directly related to the modeling of the vehicle, so that the non-frame member of the vehicle body is a main system which cannot be shared among various vehicle types. The traditional method needs to start from the beginning for each vehicle type and depends on manpower design, so that a great amount of research and development resources are required to be invested, and the research and development period is long. Meanwhile, the knowledge system for the whole vehicle and the vehicle body development is complex, and the knowledge base system is applied to the design development and needs to be manually identified and operated, so that errors are easy to occur.
Under the situation of intense market competition, a set of intelligent and efficient non-framework development method and system is urgently needed in vehicle body design.
Disclosure of Invention
Aiming at the problems in the related technology, the invention provides a passenger car body intelligent design method based on CATIA knowledge engineering, which is used for rapidly designing and developing a passenger car body non-frame member system by adopting the CATIA knowledge engineering method, avoiding almost all human design errors and realizing cost reduction and speed increase of the whole car development so as to overcome the problems in the prior related technology.
The technical scheme of the invention is realized as follows:
a passenger car body intelligent design method based on CATIA knowledge engineering comprises the following steps:
defining side door and tail door hinge positions and hinge axes in advance based on modeling and section input;
defining side door and tail door opening lines, wherein the side door opening lines are manufactured according to the projection of the side door hinge axis on an XZ plane, and the tail door opening lines are manufactured according to the projection of a top cover and tail door spoiler parting line, a side wall and rear windshield glass parting line, a side wall and spoiler parting line, a side wall and tail door parting line, a tail door and rear door parting line and a tail door hinge axis on a YZ plane;
and establishing a body-in-white assembly model, a switching part assembly model and a connecting assembly model and including three-dimensional size marking, wherein all the models are designed based on input objects and implicit parameters of a body design knowledge base, are fully parameterized and are related and quoted.
Wherein, still include the following step:
defining input objects in advance, wherein the input objects comprise a vehicle body shape and a main section;
and (4) carrying out input object inspection, including boundary inspection, smoothness inspection and position inspection on the input object.
The definition of the side door, the tail door hinge and the hinge shaft comprises a front side door, a front door hinge and a rear door hinge, wherein the front side door is defined according to a parting line of a front door A face, a front door and a side wall, and the hinge shaft is defined as an inward inclination angle of 2 degrees and a backward inclination angle of 0.5 degrees; the rear side door is defined according to the A surface of the rear door and the parting line of the rear door and the front door, and the hinge axis is defined as 2 degrees of inward inclination and 2 degrees of backward inclination; the tail gate is defined according to the A surface of the top cover and a parting line between the top cover and the rear spoiler, and the hinge axis is defined as the Y direction.
Wherein, still include the following step:
and carrying out automatic model checking, replacing the initial digital analogy, and realizing automatic checking and forming an analysis result report.
The invention has the beneficial effects that:
the invention relates to a passenger vehicle body intelligent design method based on CATIA knowledge engineering, which is characterized in that a side door, a tail door hinge and a hinge shaft are defined in advance based on modeling and section input, a side door and tail door opening line is defined, a white vehicle body assembly, a switching member assembly and a connecting assembly model are established, all models are designed based on input objects and hidden vehicle body design knowledge base parameters, the adoption of a CATIA knowledge engineering method is realized, a large amount of vehicle body development knowledge is contained, the full parameter correlation design of CATIA is realized, a passenger vehicle body non-frame member system is rapidly designed and developed, almost all artificial design errors can be avoided, the cost reduction and the speed increase of the whole vehicle development are realized, the development period is greatly shortened, and a large amount of development resources are saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a first schematic flow chart of a passenger vehicle body intelligent design method based on CATIA knowledge engineering according to an embodiment of the invention;
FIG. 2 is a second schematic flow chart of a passenger vehicle body intelligent design method based on CATIA knowledge engineering according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of input object parameters of a passenger car body intelligent design method based on CATIA knowledge engineering according to an embodiment of the invention;
FIG. 4 is a scene diagram of a passenger car body intelligent design method based on CATIA knowledge engineering according to an embodiment of the present invention;
FIG. 5 is a checking schematic diagram of a passenger car body intelligent design method based on CATIA knowledge engineering according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
According to the embodiment of the invention, the invention provides an intelligent design method of a passenger car body based on CATIA knowledge engineering.
As shown in fig. 1, the intelligent design method for a passenger car body based on the CATIA knowledge engineering according to the embodiment of the invention comprises the following steps:
defining side door and tail door hinges and hinge axes in advance based on modeling and section input;
defining side door and tail door opening lines, wherein the side door opening lines are manufactured according to the projection of the side door hinge axis on an XZ plane, and the tail door opening lines are manufactured according to the projection of a top cover and tail door spoiler parting line, a side wall and rear windshield glass parting line, a side wall and spoiler parting line, a side wall and tail door parting line, a tail door and rear door parting line and a tail door hinge axis on a YZ plane;
and establishing a body-in-white assembly model, a switching part assembly model and a connecting assembly model and including three-dimensional size marking, wherein all the models are designed based on input objects and invisible parameters of a body design knowledge base, are fully parameterized and are related and quoted.
Wherein, still include the following step:
defining input objects in advance, wherein the input objects comprise a vehicle body shape and a main section;
and (4) carrying out input object inspection, including boundary inspection, smoothness inspection and position inspection on the input object.
The definition of the side door, the tail door hinge and the hinge shaft comprises a front side door, a front door hinge and a rear door hinge, wherein the front side door is defined according to a parting line of a front door A face, a front door and a side wall, and the hinge shaft is defined as an inward inclination angle of 2 degrees and a backward inclination angle of 0.5 degrees; the rear side door is defined according to the A surface of the rear door and the parting line of the rear door and the front door, and the hinge axis is defined as 2 degrees of inward inclination and 2 degrees of backward inclination; the tail gate is defined according to the A surface of the top cover and a parting line between the top cover and the rear spoiler, and the hinge axis is defined as the Y direction.
Wherein, still include the following step: and carrying out model motion checking analysis, and according to checking standards contained in the system, realizing automatic checking and forming an analysis result report.
By means of the technical scheme, the side door hinge, the tail door hinge and the hinge shaft are defined in advance based on modeling and section input, the side door opening line and the tail door opening line are defined, a body-in-white assembly, a closing member assembly and a connecting assembly model are established, all models of the body-in-white assembly, the opening and closing member assembly and the connecting assembly model are designed based on input objects and hidden parameters of a body design knowledge base, full parameterization and mutual correlation reference are achieved, the fact that a CATIA knowledge engineering method is adopted is achieved, a large amount of body development knowledge is contained, full parameter correlation design of CATIA is achieved, a passenger vehicle body non-frame member system is rapidly designed and developed, almost all artificial design errors can be avoided, cost reduction and speed increase of whole vehicle development are achieved, the development period.
In addition, as shown in fig. 2, the specifically adopted CATIA software is used as a fully parameterized design tool to realize the rapid establishment of a set of complete and extremely mature initial model data of the non-frame member of the vehicle body, and provide corresponding analysis reports and the possibility of convenient modification. In order to reduce the complexity of the system, the system comprises two versions of a Sedan Sedan and a multifunctional vehicle SUV, which are as follows:
1. an input is defined. As shown in fig. 3, the input object is a set of all input conditions of the entire system, and mainly includes 2 major classes, body shapes, and main sections. The body build input comprises a side a, a glass side and parting lines, and the system defines 62 elements in total. Different types of vehicle body shapes are considered, for example, a vehicle side surrounding is provided with a rear triangular window, and the vehicle side surrounding is not provided with the rear triangular window, so that different possibilities are considered when defining input objects, and different options are provided on an input interface. Meanwhile, the system defines 20 main sections, the reference positioning of the main sections is determined according to modeling input, and a full parameter design is adopted. The system is provided with a set of complete default sections, the sections are defined based on a vehicle body design knowledge base, and a large amount of knowledge of vehicle body development is covered. The section main dimension parameters are associated with the subsequent model and can be modified at will.
2. And (6) checking the input materials. Considering that there is some deviation when different users define the input object, the system develops the input object checking item. And checking key information influencing subsequent model modeling, such as the boundary, smoothness, position and the like of an input object by adopting a CATIA knowledge engineering module checking function.
For example: if the side wall A is not smooth enough, the side wall A cannot be biased, and the system inspection indicates that the curved surface is not smooth enough and needs to be modified.
3. And (6) automatically designing the model. As shown in fig. 4, the method for realizing automatic model design is to adopt a CATIA part design, curved surface design and assembly design module to establish a set of complete full-parameter and parameter-associated vehicle body initial digital-analog, and the digital-analog adopts a set of initial modeling and section parameter input. And after a new input object is input, updating the whole set of model by adopting a CATIA curved surface design replacement function. The initial set of models contains all parts and elements of the non-frame components of the body, and contains and embodies all body design knowledge except for the definition of the section input.
Specifically, the lapping process is as follows:
1) side and tail door hinges and hinge axes are defined according to the model and profile inputs: the front side door is defined according to the A surface of the front door and the parting line of the front door and the side wall, and the hinge axis is defined as 2 degrees of inward inclination and 0.5 degree of backward inclination. The rear side door is defined according to the A surface of the rear door and the parting line of the rear door and the front door, and the hinge axis is defined as 2 degrees of inward inclination and 2 degrees of backward inclination. The tail gate is defined according to the A surface of the top cover and a parting line between the top cover and the rear spoiler, and the hinge axis is defined as the Y direction.
2) Defining side door and tail door opening lines: the side door opening line is manufactured according to the projection of the side door hinge axis on the XZ plane, the CATIA sketch function is not adopted, and the line lap joint of part design is adopted, so that the convenience of subsequent full-parameter association and modification is realized. The tail door opening line is manufactured according to the projection of the top cover and tail door spoiler parting line, the side wall and rear windshield glass parting line, the side wall and spoiler parting line, the side wall and tail door parting line, the tail door and rear fender parting line and the tail door hinge axis on a YZ plane;
3) and respectively establishing a body-in-white assembly model, an opening and closing part assembly model and a connecting assembly model, and including three-dimensional size marking. All models are designed based on input and implicit body design knowledge base parameters, fully parameterized and referenced in relation to each other. In order to deal with the types of complex vehicle body models, a large number of CATIA knowledge engineering module rule functions are adopted in the modeling process, scheme judgment is carried out on different types of input, and subsequent modeling operation is determined.
For example: the side wall and tail lamp parting line and the side wall and tail door parting line have two conditions, and are on one line or not. And rule judgment is added in the modeling process, and by using the measurement of the angles of the end points of the two branch seams, the system automatically judges which condition the input object belongs to and carries out the next modeling.
For another example, the welding mode of the side wall and the top cover is divided into a traditional spot welding mode and a laser welding mode, and the model judges which modeling mode is adopted according to whether the input object defines a side wall and top cover parting line or a side wall and top trim. The connection model automatically designs a corresponding connection mode according to the materials defined by the part model, and if the upper layer and the lower layer are made of steel, the connection is automatic, and spot welding connection is selected. And if the upper layer material and the lower layer material are made of the aluminum alloy, correspondingly selecting and designing proper connection modes such as SPR (surface plasma resonance), FDS (fully drawn Standard) and the like. The part model is provided with a common mounting molded surface and a mounting hole and is provided with a three-dimensional size mark.
4. And (6) automatically checking the model. As shown in fig. 5, the motion check of the shutter DMU, which is very important in the design of the vehicle body, requires the system to be performed after the automatic modeling model is completed. The principle of the method is similar to that of automatic modeling, and the system replaces an initial digital analog by using the motion analysis function of a CATIA DMU module to realize automatic checking and form an analysis result report. The system contains the motion checking knowledge of the opening and closing piece and is provided with an initial checking standard, and the standard contains 13 working conditions in total: such as the side door is opened by mistake and is closed the operating mode, side door installation operating mode etc..
In conclusion, by means of the technical scheme, the whole system can realize the rapid and accurate modeling of the non-frame member of the vehicle body through the steps, the system provides accurate initial data for a user after all the steps are finished, and the system model can be easily realized through parameter adjustment for subsequent detail and differentiation adjustment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A passenger car body intelligent design method based on CATIA knowledge engineering is characterized by comprising the following steps:
defining side door and tail door hinges and hinge axes in advance based on modeling and section input;
defining side door and tail door opening lines, wherein the side door opening lines are manufactured according to the projection of the side door hinge axis on an XZ plane, and the tail door opening lines are manufactured according to the projection of a top cover and tail door spoiler parting line, a side wall and rear windshield glass parting line, a side wall and spoiler parting line, a side wall and tail door parting line, a tail door and rear door parting line and a tail door hinge axis on a YZ plane;
and establishing a body-in-white assembly model, a switching part assembly model and a connecting assembly model and including three-dimensional size marking, wherein all the models are designed based on input objects and invisible parameters of a body design knowledge base, are fully parameterized and are related and quoted.
2. The intelligent design method for the body of the passenger vehicle based on the CATIA knowledge engineering as claimed in claim 1, further comprising the steps of:
defining input objects in advance, wherein the input objects comprise a vehicle body shape and a main section;
and (4) carrying out input object inspection, including boundary inspection, smoothness inspection and position inspection on the input object.
3. The CATIA knowledge engineering based intelligent design method for passenger vehicle bodies as claimed in claim 2, wherein the definition of side door and back door hinges and hinge axes, including front side door, is defined according to front door A-plane and front door and side body parting line, and its hinge axis is defined as 2 ° leaned in and 0.5 ° leaned back; the rear side door is defined according to the A surface of the rear door and the parting line of the rear door and the front door, and the hinge axis is defined as 2 degrees of inward inclination and 2 degrees of backward inclination; the tail gate is defined according to the A surface of the top cover and a parting line between the top cover and the rear spoiler, and the hinge axis is defined as the Y direction.
4. The intelligent design method for the body of the passenger vehicle based on the CATIA knowledge engineering as claimed in claim 2, further comprising the steps of:
and carrying out model motion checking analysis, and according to checking standards contained in the system, realizing automatic checking and forming an analysis result report.
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Cited By (1)
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| CN114313070A (en) * | 2021-11-23 | 2022-04-12 | 江铃汽车股份有限公司 | Power assembly checking method, system, storage medium and equipment |
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Application publication date: 20210601 |