CN116415358A - Automobile grille air inlet area calculation method and system - Google Patents
Automobile grille air inlet area calculation method and system Download PDFInfo
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Abstract
The application relates to an automobile grille air inlet area calculation method and system, comprising a first model for controlling grille boundaries, a second model and a fourth model for controlling grille mesh quantity and grille mesh arrangement trend, a third model for controlling grille mesh size and grille mesh shape, and a fifth model for calculating grille air inlet area, wherein each node of an automobile grille in a design process corresponds to one model, and input parameters of each node can be adjusted. After initial data of an initial design scheme are obtained, the air inlet area of the grille can be obtained rapidly, and the adjustment step of the air inflow of the grille is advanced to the design stage of the effect diagram; the method has the advantages that the grid curved surface with grid meshes is directly generated by utilizing parameters set by CAS designers, and the air inlet area of the grid is obtained; and parameters of the grid can be adjusted at any time after the grid is input so as to meet the requirement of engineering air inlet area, greatly reduce CAS design time and provide powerful support for CAS data to be frozen as soon as possible.
Description
Technical Field
The application relates to the field of automobile model design, in particular to an automobile grille air inlet area calculation method and an automobile grille air inlet area calculation system.
Background
In the prior art, a creative designer, a CAS designer and a CAE engineer are usually required to work cooperatively, and grid CAS data are adjusted for many times; the method comprises the following steps:
i. the digital modeler makes the mesh of the grid according to the modeling effect diagram and engineering input conditions;
ii. Projecting the mesh made in the previous step onto the large surface of the grille;
iii, cutting the grille by using the projection curve of the previous step to obtain a grille mesh effect;
iv, the stylist evaluates the overall effect of the grid meshes and makes a modification suggestion;
v, repeating the first to fourth steps until the grid mesh modeling is OK;
vi, the engineer analyzes the mesh air inlet area of the OK grid molded in the last step;
and vii, if the air inlet area is insufficient, repeating the first step to the sixth step until the air inlet area is OK.
The air inlet area checking technology mainly adjusts the air inlet area of the grille by repeatedly changing CAS, and because the change of the grille modeling is complex, the data manufacturing workload of the grille CAS is large, all steps need to be carried out again for each adjustment, which is equivalent to the re-manufacturing of the grille CAS, and the method is unfavorable for the promotion of the early modeling work and takes a large amount of time.
Disclosure of Invention
The embodiment of the application provides a method and a system for calculating the air inlet area of an automobile grille, which are used for solving the problems that in the related technology, in the checking of the air inlet area, all steps are needed to be carried out again in sequence for each adjustment, the calculation workload is large, and the time consumption is large.
In a first aspect, there is provided a method for calculating an intake area of an automotive grille, including:
obtaining a first curved surface based on the first model and the grid boundary;
based on a second model, the number of grid meshes and the grid mesh arrangement trend, establishing a plurality of crossed columns of first curves and a plurality of rows of second curves on the first curved surface to obtain a second curved surface;
extracting the intersection point of the first curve and the second curve from the second curved surface based on a fourth model to obtain an intersection point distribution map;
based on a third model, taking the cross points on the cross point distribution diagram as the centers of grid meshes, and constructing the grid meshes meeting the target size and the target shape on the first curved surface to obtain a third curved surface;
and calculating the area difference between the third curved surface and the first curved surface based on the fifth model to obtain the air inlet area of the grille.
In some embodiments, the method further comprises the steps of:
analyzing the air inlet area of the grille and the design requirement;
if the design requirement is not met, the initial data is adjusted, and the air inlet area of the grille is re-acquired; the initial data includes at least one of a grid boundary, a number of grid meshes, a grid mesh arrangement tendency, a target size of the grid meshes, and a target shape of the grid meshes;
and if the design requirement is met, taking the initial data as final data.
In some embodiments, the method further comprises a sixth model for generating a three-dimensional solid surface from the first surface, the second surface, the intersection profile, and the third surface.
In some embodiments, the first model includes a surface building unit;
inputting the grid boundary into the curved surface construction unit to form the first curved surface.
In some embodiments, the second model comprises a first arrangement unit, a shearing unit, a transition curve unit, and a combining unit;
based on the second model, the number of grid meshes and the grid mesh arrangement trend, establishing a plurality of columns of first curves on the first curved surface, wherein the method comprises the following steps of:
acquiring the number of columns of the grid meshes from left to right or from right to left;
forming a plurality of initial lines equal to the number of columns by utilizing the first arrangement unit and combining the overall arrangement trend of the grid meshes on each column and the adjacent columns; each column of initial lines comprises a plurality of connected straight line segments;
shearing bending parts, in which the straight line segments are connected, in each row of the initial lines by utilizing the shearing units;
forming a transition curve at the sheared bending part by utilizing the local arrangement trend of the transition curve units and the grid meshes on each column and the adjacent columns;
and combining the transition curve with the rest straight line segments by using the combination unit to obtain a first curve.
In some embodiments, the second model further comprises a second arrangement unit;
establishing a plurality of rows of second curves on the first curved surface based on the second model and the grid mesh number and grid mesh arrangement trend, comprising the following steps of
Obtaining the maximum number of rows of the grid meshes from top to bottom or from bottom to top;
and forming a plurality of columns of second curves equal to the maximum number of rows by utilizing the second arrangement units and combining the arrangement trend of the grid meshes on each row and the adjacent rows.
In some embodiments, the fourth model includes a cross point acquisition unit and a distributed weight unit;
extracting the intersection point of the first curve and the second curve from the second curved surface to obtain an intersection point distribution map, wherein the method comprises the following steps of:
extracting all the intersecting points from the second curved surface by using the intersecting point acquisition unit;
and selecting all the crossing points in the distribution weight unit according to the grid mesh number and the grid mesh arrangement trend to obtain a crossing point distribution diagram.
In some embodiments, the third model includes an ellipse construction element and an ellipse shearing element;
the initial data also includes a fade direction for the grid mesh;
based on a third model, taking the crossing points on the crossing point distribution diagram as the centers of grid meshes, constructing the grid meshes meeting the target size and the target shape on the first curved surface to obtain a third curved surface, and comprising the following steps of:
taking the intersection point as the intersection point of the major axis and the minor axis of the ellipse;
determining the gradual change direction, the major axis value and the minor axis value of the external ellipse of the grid mesh according to the gradual change direction of the grid mesh and the target size of the grid mesh; then, an ellipse constructing unit is utilized to establish grid mesh external ellipse by the intersection points;
according to the target shape of the grid mesh, obtaining a corresponding point corresponding to the target shape on the outer edge of the grid mesh circumscribed ellipse; connecting corresponding points on the external ellipse of each grid mesh in series to form a pattern to be sheared;
and shearing according to the pattern to be sheared by using the elliptical shearing unit so as to obtain the grid mesh of the target.
In some embodiments, connecting corresponding points on each grid mesh circumscribed ellipse in series comprises the steps of:
if the target shape of the grid mesh does not correspond to the part on the oval circumscribed by the grid mesh, the curve is used for series connection;
if the target shape of the grid mesh is not straight, the part corresponding to the grid mesh circumscribed on the ellipse is connected in series by using the straight line.
In a second aspect, there is provided an automotive grille-intake area calculation system comprising:
the first module is used for obtaining a first curved surface based on the first model and the grid boundary;
the second module is used for establishing a plurality of crossed columns of first curves and a plurality of rows of second curves on the first curved surface based on the second model, the number of grid meshes and the grid mesh arrangement trend so as to obtain a second curved surface;
a third module for extracting an intersection of the first curve and the second curve from the second curved surface based on a fourth model to obtain an intersection profile;
a fourth module, configured to construct, based on a third model, grid meshes satisfying a target size and a target shape on the first curved surface with the intersections on the intersection distribution map as centers of the grid meshes, so as to obtain a third curved surface;
and the fifth module is used for calculating the area difference value between the third curved surface and the first curved surface based on the fifth model so as to obtain the air inlet area of the grille.
The beneficial effects that technical scheme that this application provided brought include:
the embodiment of the application provides a method and a system for calculating the air inlet area of an automobile grille, which are provided with a first model for controlling the boundary of the grille, a second model and a fourth model for controlling the mesh number and the mesh arrangement trend of the grille, a third model for controlling the mesh size and the mesh shape of the grille and a fifth model for calculating the air inlet area of the grille, so that each node of the automobile grille in the design process corresponds to one model, and the input parameters of each node can be adjusted. According to the first aspect, after initial data of an initial design scheme are obtained, the air inlet area of the grille can be obtained quickly, and the adjustment step of the air inflow of the grille is advanced to the design stage of the effect diagram, so that the feasibility of the modeling scheme is ensured; in the second aspect, when adjustment is needed, all the models do not need to be sequentially and completely restarted, and the corresponding models are adjusted according to the parameters needing to be adjusted. The method has the advantages that parameters set by CAS designer can be directly input to generate a grid curved surface with grid meshes, and the air inlet area of the grid is obtained; and parameters of the grid can be adjusted at any time after the grid is input so as to meet the requirement of engineering air inlet area, greatly reduce CAS design time and provide powerful support for CAS data to be frozen as soon as possible.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a plurality of initial lines formed by a second mold provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of a first curve formed by a second model according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a first curve and a second curve formed by a second model according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of all intersecting points on a second curved surface according to an embodiment of the present disclosure;
FIG. 5 is a cross-point profile formed by a fifth model provided in an embodiment of the present application;
FIG. 6 is a schematic view of a grid mesh circumscribed ellipse formed by a third pattern provided in an embodiment of the present application;
FIG. 7 is a schematic view of corresponding points on the outer edge of a grid mesh circumscribed ellipse formed by a third pattern provided in an embodiment of the present application;
FIG. 8 is a schematic diagram of a pattern to be sheared formed by a third model according to an embodiment of the present disclosure;
FIG. 9 is a schematic illustration of a third curved surface with a grid mesh of a target formed by a third mold provided in an embodiment of the present application;
fig. 10 is a schematic view of a third curved surface with a target grid mesh formed by a third model according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
The embodiment of the application provides a method and a system for calculating the air inlet area of an automobile grille, which are used for solving the problems that in the related technology, in the process of checking the air inlet area, all steps are needed to be carried out again in sequence for each adjustment, the calculation workload is large, and the time consumption is large.
Referring to fig. 1-8, a method for calculating an air intake area of an automobile grille includes the following steps:
101. obtaining a first curved surface based on the first model and the grid boundary;
102. based on the second model, the number of grid meshes and the grid mesh arrangement trend, establishing a plurality of crossed columns of first curves and a plurality of rows of second curves on the first curved surface to obtain a second curved surface;
103. based on a fourth model, extracting an intersection point of the first curve and the second curve from the second curved surface to obtain an intersection point distribution map;
104. based on a third model, constructing grid meshes meeting the target size and the target shape on the first curved surface by taking the cross points on the cross point distribution diagram as the centers of the grid meshes so as to obtain a third curved surface;
105. and calculating the area difference between the third curved surface and the first curved surface based on the fifth model to obtain the air inlet area of the grille.
Wherein the first model, the second model, the third model, the fourth model and the fifth model are established by Dynamo; dynamo is a piece of open-source three-dimensional visual programming software, and a user can create the model through script writing. And then parameters such as grid boundaries, grid mesh number, grid mesh arrangement trend, target sizes of grid meshes, target shapes of the grid meshes and the like set by the CAS designer are input into corresponding models, so that the grid air inlet area can be rapidly obtained.
The first model is used for controlling the grid boundary, the second model and the fourth model are used for controlling the grid mesh quantity and the grid mesh arrangement trend, the third model is used for controlling the grid mesh size and the grid mesh shape, and the fifth model is used for calculating the grid air inlet area, so that each node of the automobile grid in the design process corresponds to one model, and the input parameter of each node can be adjusted. According to the first aspect, after initial data of an initial design scheme are obtained, the air inlet area of the grille can be obtained quickly, and the adjustment step of the air inflow of the grille is advanced to the design stage of the effect diagram, so that the feasibility of the modeling scheme is ensured; in the second aspect, when adjustment is needed, all the models do not need to be sequentially and completely restarted, and the corresponding models are adjusted according to the parameters needing to be adjusted. The method has the advantages that parameters set by CAS designer can be directly input to generate a grid curved surface with grid meshes, and the air inlet area of the grid is obtained; and parameters of the grid can be adjusted at any time after the grid is input so as to meet the requirement of engineering air inlet area, greatly reduce CAS design time and provide powerful support for CAS data to be frozen as soon as possible.
Among other things, it should also be appreciated that: when it is required to determine whether the grille-intake area satisfies the design requirement, the following operations are performed:
analyzing the air inlet area of the grille and the design requirement;
if the design requirement is not met, the initial data is adjusted, and the air inlet area of the grille is re-acquired; the initial data includes at least one of a grid boundary, a number of grid meshes, a grid mesh arrangement tendency, a target size of the grid meshes, and a target shape of the grid meshes; and if the design requirement is met, taking the initial data as the final data. Therefore, a creative designer-level digital modeler adjusts the control parameters mentioned in the patent according to the grid air inflow specified by engineering, and various schemes are obtained for the designer to select and push.
In the case of adjustment, it can be understood that: after the parameters of step 103 are adjusted, only steps 103-105 are needed to be repeated; after the parameters of the step 104 are adjusted, only the steps 104-105 are needed to be repeated; after adjusting the parameters of step 103, after adjusting the parameters of step 102, steps 102-105 are repeated.
In addition, the method further comprises a sixth model, wherein the sixth model is used for generating the first curved surface, the second curved surface, the cross point distribution map and the third curved surface into a three-dimensional solid curved surface so as to visually check the curved surface effect after the parameters are adjusted by each design node.
In some preferred embodiments, the first curved surface is obtained based on the first model and the grid boundary, and the following is explained:
the first model comprises a curved surface construction unit;
the grill boundary is input into the curved surface constructing unit to form a first curved surface, thereby determining a formation area of the grill mesh. The surface construction unit is written in Dynamo by a program script.
Referring to fig. 1-3, in some preferred embodiments, the second model includes a first arrangement unit, a shearing unit, a transition curve unit, and a combining unit;
based on the second model and the grid mesh number and grid mesh arrangement trend, establishing a plurality of columns of first curves on the first curved surface, wherein the method comprises the following steps of:
acquiring the number of columns of grid meshes in initial data from left to right or from right to left;
forming a plurality of initial lines with the same column number by utilizing the first arrangement unit and combining the overall arrangement trend of the grid meshes on each column and the adjacent columns; each column of initial lines comprises a plurality of connected straight line segments; the arrangement trend of the grid meshes on each column can be understood as the interval distance between the upper and lower adjacent grid meshes, and the angle of the vertical standard line is relative to the angle of the vertical standard line, wherein the vertical standard line is the central axis of the first curved surface; the overall arrangement trend of the grid meshes on adjacent columns can be understood as the left-right adjacent spacing distance of the grid meshes on different columns and the angle relative to the horizontal standard line, wherein the horizontal standard line and the vertical standard line are mutually perpendicular. Reference is made to figure 1.
Shearing a bending part connected with the straight line segments in each column of initial lines by utilizing a shearing unit; forming a transition curve at the sheared bending part by utilizing the local arrangement trend of the transition curve units and the grid meshes on each column and the adjacent columns; the transition curve is combined with the remaining straight line segments by means of a combining unit to obtain a first curve. Reference is made to figure 2.
The transition curve is formed, so that the first curve is more accurate, and the first curve completely accords with grid hole arrangement. In addition, due to the design of different grid meshes, the distribution condition of the grid meshes is different, and the number of transition curves on a first curve line shown in fig. 2 can be one or more.
Further, the second model further comprises a second arrangement unit; based on the second model and the grid mesh number and grid mesh arrangement trend, establishing a plurality of rows of second curves on the first curved surface, comprising the following steps:
obtaining the maximum number of rows of the grid meshes from top to bottom or from bottom to top; the reason for choosing the maximum number of rows is that the grid meshes on different columns have different rows; and forming a plurality of columns of second curves equal to the maximum number of rows by using the second arrangement units and combining the arrangement trend of the grid meshes on each row and the adjacent rows. Reference is made to fig. 3. Through the setting of the second model, then combine the parameter of grid mesh quantity and grid mesh arrangement trend, can obtain the description grid mesh and be listed in the form of arranging on the row and the column to for the central point of grid mesh is obtained afterwards, provide the basis, obtain can set up all positions of grid mesh.
Referring to fig. 4 and 5, in some preferred embodiments, the fourth model includes a cross point acquisition unit and a distributed weight unit; extracting the intersection point of the first curve and the second curve from the second curved surface to obtain an intersection point distribution map, comprising the following steps:
extracting all the intersections from the second curved surface by using an intersection acquisition unit, as shown in fig. 4; in this step all the crossing points of the grid mesh can be set; selecting or screening all the crossing points in the distribution weight unit according to the number of the grid meshes and the grid mesh arrangement trend to obtain a crossing point distribution diagram, as shown in fig. 5; the distributed weight unit controls the staggered change of a plurality of crossing points; with respect to the staggered variation, there may be the following description with reference to fig. 4 where the intersection includes a plurality of repeating units, each repeating unit including two columns of staggered intersections. Alternatively, the intersections on the first curve of each column may be selected at intervals, so that the selected intersections meet the following rule: adjacent intersections on each column of the first curve are separated by one or more rows of the second curve.
In some preferred embodiments, the third model includes an ellipse construction element and an ellipse shearing element;
the initial data also includes a fade direction for the grid mesh; based on a third model, with the cross points on the cross point distribution diagram as the centers of grid meshes, constructing the grid meshes meeting the target size and the target shape on the first curved surface to obtain a third curved surface, and the method comprises the following steps:
taking the intersection point as the intersection point of the major axis and the minor axis of the ellipse;
determining the gradual change direction, the major axis value and the minor axis value of the external ellipse of the grid mesh according to the gradual change direction of the grid mesh and the target size of the grid mesh; then, an ellipse constructing unit is utilized to establish grid mesh external ellipse by the intersection points; the method comprises the following steps: utilizing the inputted gradual change direction, major axis value and minor axis value of external ellipse to ellipse construction unit to control initial position and direction of grid pattern change; the aspect ratio of the ellipse is controlled by the minimum range of the minor axis of the ellipse, the maximum range of the minor axis of the ellipse, the minimum range of the major axis of the ellipse, and the maximum range of the major axis of the ellipse. Reference may be made to fig. 6.
According to the target shape of the grid mesh, obtaining a corresponding point corresponding to the grid mesh on the outer edge of the external ellipse of the grid mesh; reference may be made to fig. 7.
Connecting corresponding points on the external ellipse of each grid mesh in series to form a solid 3D model of the graph to be sheared; reference may be made to fig. 8. The corresponding points on the external ellipse of each grid mesh are connected in series, and the method comprises the following steps: if the target shape of the grid mesh does not correspond to the part on the oval circumscribed by the grid mesh, the curve is used for series connection; if the target shape of the grid mesh is not straight, the part corresponding to the grid mesh circumscribed on the ellipse is connected in series by using the straight line. Which takes into account the different shapes of the grid mesh.
The grid mesh to be cut according to the pattern to be cut using the elliptical cutting unit to obtain the target can be referred to as shown in fig. 9.
The application also provides an automobile grille air inlet area calculation system, which comprises:
the first module is used for obtaining a first curved surface based on the first model and the grid boundary;
the second module is used for establishing a plurality of crossed columns of first curves and a plurality of rows of second curves on the first curved surface based on the second model, the number of grid meshes and the grid mesh arrangement trend so as to obtain a second curved surface;
a third module for extracting an intersection of the first curve and the second curve from the second curved surface based on the fourth model to obtain an intersection profile;
a fourth module for constructing a grid mesh satisfying the target size and the target shape on the first curved surface with the cross points on the cross point distribution map as the centers of the grid mesh based on the third model to obtain a third curved surface;
and the fifth module is used for calculating the area difference value between the third curved surface and the first curved surface based on the fifth model so as to obtain the air inlet area of the grille.
The above system has the following advantages:
when the adjustment is needed, the corresponding models are adjusted according to the parameters to be adjusted without sequentially and completely going through again. The method has the advantages that parameters set by CAS designer can be directly input to generate a grid curved surface with grid meshes, and the air inlet area of the grid is obtained; and parameters of the grid can be adjusted at any time after the grid is input so as to meet the requirement of engineering air inlet area, greatly reduce CAS design time and provide powerful support for CAS data to be frozen as soon as possible.
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The method for calculating the air inlet area of the automobile grille is characterized by comprising the following steps of:
obtaining a first curved surface based on the first model and the grid boundary;
based on a second model, the number of grid meshes and the grid mesh arrangement trend, establishing a plurality of crossed columns of first curves and a plurality of rows of second curves on the first curved surface to obtain a second curved surface;
extracting the intersection point of the first curve and the second curve from the second curved surface based on a fourth model to obtain an intersection point distribution map;
based on a third model, taking the cross points on the cross point distribution diagram as the centers of grid meshes, and constructing the grid meshes meeting the target size and the target shape on the first curved surface to obtain a third curved surface;
and calculating the area difference between the third curved surface and the first curved surface based on the fifth model to obtain the air inlet area of the grille.
2. The method for calculating an intake area of an automotive grill according to claim 1, further comprising the steps of:
analyzing the air inlet area of the grille and the design requirement;
if the design requirement is not met, the initial data is adjusted, and the air inlet area of the grille is re-acquired; the initial data includes at least one of a grid boundary, a number of grid meshes, a grid mesh arrangement tendency, a target size of the grid meshes, and a target shape of the grid meshes;
and if the design requirement is met, taking the initial data as final data.
3. The automobile grille-intake area calculation method according to claim 1, characterized in that:
the method further comprises a sixth model, wherein the sixth model is used for generating a three-dimensional solid curved surface from the first curved surface, the second curved surface, the cross point distribution map and the third curved surface.
4. The automobile grille-intake area calculation method according to claim 1, characterized in that:
the first model comprises a curved surface construction unit;
inputting the grid boundary into the curved surface construction unit to form the first curved surface.
5. The automobile grille-intake area calculation method according to claim 1, characterized in that:
the second model comprises a first arrangement unit, a shearing unit, a transition curve unit and a combination unit;
based on the second model, the number of grid meshes and the grid mesh arrangement trend, establishing a plurality of columns of first curves on the first curved surface, wherein the method comprises the following steps of:
acquiring the number of columns of the grid meshes from left to right or from right to left;
forming a plurality of initial lines equal to the number of columns by utilizing the first arrangement unit and combining the overall arrangement trend of the grid meshes on each column and the adjacent columns; each column of initial lines comprises a plurality of connected straight line segments;
shearing bending parts, in which the straight line segments are connected, in each row of the initial lines by utilizing the shearing units;
forming a transition curve at the sheared bending part by utilizing the local arrangement trend of the transition curve units and the grid meshes on each column and the adjacent columns;
and combining the transition curve with the rest straight line segments by using the combination unit to obtain a first curve.
6. The automobile grille-intake area calculation method according to claim 1, characterized in that:
the second model further comprises a second arrangement unit;
establishing a plurality of rows of second curves on the first curved surface based on the second model and the grid mesh number and grid mesh arrangement trend, comprising the following steps of
Obtaining the maximum number of rows of the grid meshes from top to bottom or from bottom to top;
and forming a plurality of columns of second curves equal to the maximum number of rows by utilizing the second arrangement units and combining the arrangement trend of the grid meshes on each row and the adjacent rows.
7. The automobile grille-intake area calculation method according to claim 1, characterized in that:
the fourth model comprises a cross point acquisition unit and a distributed weight unit;
extracting the intersection point of the first curve and the second curve from the second curved surface to obtain an intersection point distribution map, wherein the method comprises the following steps of:
extracting all the intersecting points from the second curved surface by using the intersecting point acquisition unit;
and selecting all the crossing points in the distribution weight unit according to the grid mesh number and the grid mesh arrangement trend to obtain a crossing point distribution diagram.
8. The automobile grille-intake area calculation method according to claim 2, characterized in that:
the third model comprises an ellipse construction unit and an ellipse shearing unit;
the initial data also includes a fade direction for the grid mesh;
based on a third model, taking the crossing points on the crossing point distribution diagram as the centers of grid meshes, constructing the grid meshes meeting the target size and the target shape on the first curved surface to obtain a third curved surface, and comprising the following steps of:
taking the intersection point as the intersection point of the major axis and the minor axis of the ellipse;
determining the gradual change direction, the major axis value and the minor axis value of the external ellipse of the grid mesh according to the gradual change direction of the grid mesh and the target size of the grid mesh; then, an ellipse constructing unit is utilized to establish grid mesh external ellipse by the intersection points;
according to the target shape of the grid mesh, obtaining a corresponding point corresponding to the target shape on the outer edge of the grid mesh circumscribed ellipse; connecting corresponding points on the external ellipse of each grid mesh in series to form a pattern to be sheared;
and shearing according to the pattern to be sheared by using the elliptical shearing unit so as to obtain the grid mesh of the target.
9. The automobile grille-intake area calculation method according to claim 8, characterized in that:
the corresponding points on the external ellipse of each grid mesh are connected in series, and the method comprises the following steps:
if the target shape of the grid mesh does not correspond to the part on the oval circumscribed by the grid mesh, the curve is used for series connection;
if the target shape of the grid mesh is not straight, the part corresponding to the grid mesh circumscribed on the ellipse is connected in series by using the straight line.
10. An automotive grille-intake area computing system, comprising:
the first module is used for obtaining a first curved surface based on the first model and the grid boundary;
the second module is used for establishing a plurality of crossed columns of first curves and a plurality of rows of second curves on the first curved surface based on the second model, the number of grid meshes and the grid mesh arrangement trend so as to obtain a second curved surface;
a third module for extracting an intersection of the first curve and the second curve from the second curved surface based on a fourth model to obtain an intersection profile;
a fourth module, configured to construct, based on a third model, grid meshes satisfying a target size and a target shape on the first curved surface with the intersections on the intersection distribution map as centers of the grid meshes, so as to obtain a third curved surface;
and the fifth module is used for calculating the area difference value between the third curved surface and the first curved surface based on the fifth model so as to obtain the air inlet area of the grille.
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| CN202310400933.9A CN116415358A (en) | 2023-04-14 | 2023-04-14 | Automobile grille air inlet area calculation method and system |
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