CN112298405B - Method for determining movement track of metal plate in two-dimensional section of vehicle door sealing strip - Google Patents
Method for determining movement track of metal plate in two-dimensional section of vehicle door sealing strip Download PDFInfo
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- CN112298405B CN112298405B CN202011136683.5A CN202011136683A CN112298405B CN 112298405 B CN112298405 B CN 112298405B CN 202011136683 A CN202011136683 A CN 202011136683A CN 112298405 B CN112298405 B CN 112298405B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J10/00—Sealing arrangements
- B60J10/80—Sealing arrangements specially adapted for opening panels, e.g. doors
- B60J10/84—Sealing arrangements specially adapted for opening panels, e.g. doors arranged on the vehicle body
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Abstract
The invention belongs to the technical field of automobiles, and particularly relates to a method for determining a metal plate motion track in a two-dimensional section of a door sealing strip. The method comprises the following steps: step one, establishing a three-dimensional model by using three-dimensional geometric data; secondly, creating a cross-sectional plane of the sealing strip at the concerned position and generating a contour line of the sealing strip; cutting the sheet metal data by using the cross section of the sealing strip to obtain a sheet metal profile in the cross section; step four, determining a vehicle door rotating shaft by using the hinge data; fifthly, generating projections of the metal plate contour lines in the two states in the cross section; step six, selecting metal plate projection characteristic points and determining a metal plate motion track; and seventhly, equivalently deflecting the section to a standard two-dimensional plane. The method can determine the motion interaction track of the sealing strip and the metal plate section in the two-dimensional CLD analysis by a simple and efficient method, so that the analysis efficiency and precision are improved, and the research and development period is shortened.
Description
Technical Field
The invention belongs to the technical field of passenger vehicles, and particularly relates to a method for determining a metal plate motion track in a two-dimensional section of a vehicle door sealing strip.
Background
In recent years, the development cycle of passenger cars is gradually compressed, a serious challenge is brought to each development link, each specialty needs to intervene in advance, and performance evaluation is particularly important in the early stage of a project by using simulation analysis. The sealing performance of the sealing strip is reasonably designed in the early development stage of the section of the sealing strip of the vehicle door, and great help is provided for shortening the development period and improving the development efficiency.
The sealing force of the sealing strip is an important factor influencing the closing quality of the vehicle door and the NVH performance of the passenger compartment. The sealing force is too small, so that the sealing strip cannot be in close contact with a metal plate, external noise and solid dust enter a vehicle body, and the riding comfort is reduced. Excessive sealing force can cause difficulty in closing the vehicle door, accelerate abrasion of the sealing strip and reduce the service life of the sealing strip. The compression deformation force (CLD curve) of the two-dimensional section of the sealing strip is an important index for representing the sealing force of the sealing strip. Calculating the CLD curves of the sealing strips under different compression amounts and different compression forms provides important basis for the development of the sealing strips, the vehicle doors and the vehicle body sections.
When the sealing strip CLD curve is subjected to simulation analysis, boundary conditions during simulation analysis are determined according to the real motion relationship between the sealing strip and the vehicle body. The mutual relation between the sealing strip and the vehicle body has larger difference at different positions of the vehicle door, a simple, efficient and scientific method for determining the interaction form between the sealing strip and the metal plate is explored, and the efficiency and the precision of simulation analysis can be improved.
At present, technologies of the CLD analysis of the two-dimensional section of the sealing strip and other simulation analysis by utilizing the CLD curve are mature, but no determination method of boundary conditions in the analysis is mentioned.
Disclosure of Invention
The invention provides a method for determining a metal plate movement track in a two-dimensional section of a sealing strip of a vehicle door, which can determine the movement interaction track of the sealing strip and the metal plate section in two-dimensional CLD analysis by a simple and efficient method, so that the analysis efficiency and precision are improved, the research and development period is shortened, and the market blank is filled.
The technical scheme of the invention is described as follows by combining the attached drawings:
a method for determining a metal plate motion track in a two-dimensional section of a vehicle door sealing strip comprises the following steps:
step one, establishing a three-dimensional model by using three-dimensional geometric data;
secondly, creating a cross-sectional plane of the sealing strip at the concerned position and generating a contour line of the sealing strip;
cutting the sheet metal data by using the cross section of the sealing strip to obtain a sheet metal profile in the cross section;
step four, determining a vehicle door rotating shaft by using the hinge data;
fifthly, generating projections of the metal plate contour lines in the two states in the cross section;
step six, selecting metal plate projection characteristic points and determining a metal plate motion track;
and seventhly, equivalently deflecting the section to a standard two-dimensional plane.
The specific method of the first step is as follows:
establishing a three-dimensional model in Hypermesh software by using three-dimensional geometric data of the sealing strip 3, the vehicle body metal plate 4, the lower hinge 1 and the upper hinge 2; the three-dimensional geometric data of the sealing strip 3, the automobile body metal plate 4, the lower hinge 1 and the upper hinge 2 are all in a state when the automobile door is closed.
The specific method of the second step is as follows:
selecting a point on the outer contour line of the sealing strip 3 at the concerned position, marking the point as O, drawing a perpendicular line of two side contour lines on the outer surface of the sealing strip 3 through the point O, and marking the point A, B as two intersection points of the perpendicular line and the other two contour lines; drawing a vertical line to other contour lines by using a point A, B until a closed curve is formed; a square cross section S12 with O point as the center is generated by using A, B, O three points, and the side length L of the square cross section is 100 mm; and projecting the closed curve to a plane to obtain the contour line of the sealing strip in the section.
The concrete method of the third step is as follows:
the sheet metal data are cut by utilizing the cross section S12, the intersection line of the cross section S12 and the sheet metal curved surface is the contour line of the sheet metal, and the sheet metal contour line with a length capable of covering the mounting surface at the top of the sealing strip is selected to project to the cross section S12 and is recorded as an alpha-state sheet metal contour line 6.
The concrete method of the fourth step is as follows:
the rotation axis 5 of the door is determined by the centers of the upper and lower hinge holes of the upper hinge 2 and the lower hinge 1 in the hinge data.
The concrete method of the step five is as follows:
and rotating the alpha-state sheet metal contour line 6 along the rotating shaft 5 to ensure that the projection of the sheet metal contour on the cross section is tangent with the outer contour of the sealing strip 3, and the projection is a beta-state sheet metal contour line 7.
The concrete method of the sixth step is as follows:
and connecting the characteristic points with the same metal plate contour line in the two states, wherein the characteristic points are usually the end points on the same side, and generating a line segment, wherein the line segment is the motion track of the metal plate outer contour in the cross section S12.
The concrete method of the seventh step is as follows:
and taking the point O as the center, generating a square with the side length of 100mm vertical to the Z axis, namely a standard two-dimensional section P13, and performing equivalent deflection on the cross section S12 by utilizing the congruent principle to obtain the metal plate running track in a standard two-dimensional plane.
The invention has the beneficial effects that:
1) the method determines the motion interaction track of the sealing strip and the metal plate section in the two-dimensional CLD analysis by a simple and efficient method, provides support for the development of the sealing strip and the section of the automobile body, and improves the efficiency and the precision of simulation analysis;
2) the invention shortens the research and development period.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention 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 that other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional geometric model including upper and lower hinges, a sealing strip, and a vehicle body metal plate;
FIG. 3 is a schematic view of the outer profile of the sealing strip with three points A, B, O;
FIG. 4 is a schematic view of a hinge and a rotation shaft;
FIG. 5 is a top view of a cross section S containing the sheet metal contour lines in the alpha and beta states and the sheet metal movement locus;
FIG. 6 is a schematic view of approximate chord and arc lengths;
fig. 7 is a schematic diagram showing a positional relationship between the cross section S and the standard two-dimensional cross section P.
In the figure: 1. a lower hinge; 2. an upper hinge; 3. a sealing strip; 4. a vehicle body metal plate; 5. a rotating shaft; 6. the outline of the alpha-state sheet metal; 7. beta state sheet metal contour lines; 8. a metal plate motion track; 9. point cutting; 10. a first feature point; 11. a second feature point; 12. a cross section S; 13. a standard two-dimensional cross section P.
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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a method for determining a movement track of a metal plate in a two-dimensional section of a sealing strip of a vehicle door comprises the following steps:
step one, establishing a three-dimensional model by using three-dimensional geometric data;
referring to fig. 2, a three-dimensional model is created in Hypermesh software by using three-dimensional geometric data of a sealing strip 3, a vehicle body metal plate 4, a lower hinge 1 and an upper hinge 2; the three-dimensional geometric data of the sealing strip 3, the automobile body metal plate 4, the lower hinge 1 and the upper hinge 2 are all in a state when the automobile door is closed.
The three-dimensional geometrical data used should be a three-dimensional entity or a two-dimensional curved surface containing thickness information.
Secondly, creating a cross-sectional plane of the sealing strip at the concerned position and generating a contour line of the sealing strip;
referring to fig. 3, a point is selected on the outer contour line of the seal strip 3 at the position of interest, and is marked as O point, through which a perpendicular line of two side contour lines is made on the outer surface of the seal strip 3, and the perpendicular line and the other two contour lines generate two intersection points, which are marked as A, B point; drawing a vertical line to other contour lines by using a point A, B until a closed curve is formed; generating a square cross section S12 with the O point as the center by using A, B, O points; the projection of the closed curve onto a plane is the outline of the sealing strip 3 in this section.
The cross section S12 of the generated square is centered at point O, and the side length L is set to 100 mm.
Cutting the sheet metal data by using the cross section of the sealing strip to obtain a sheet metal profile in the cross section;
referring to fig. 5, the sheet metal data is cut by using a cross section S12, the intersection line of the cross section and the sheet metal curved surface is the contour line of the sheet metal, and a sheet metal contour line with a length capable of covering the mounting surface at the top of the sealing strip is selected to project to the cross section S and is marked as an alpha-state sheet metal contour line 6.
When the cross section of the sealing strip is used for cutting the sheet metal data, a trim with surface method in a surface edge panel is adopted.
Step four, determining a vehicle door rotating shaft 5 by using the hinge data;
referring to fig. 4, the rotation axis 5 of the door is defined by the centers of the upper and lower hinge holes in the hinge data of the upper and lower hinges 2 and 1.
When the center of the hinge hole is selected, a distance panel is selected, and a circle center is determined by using three points on the circumference.
Fifthly, generating projections of the metal plate contour lines in the two states in the cross section;
the alpha-state metal plate contour line 6 is rotated along the rotating shaft 5, so that the projection of the metal plate contour on the cross section is tangent to the outer contour of the sealing strip and tangent to a tangent point 9, and the projection is a beta-state metal plate contour line 7.
When the metal plate contour line is rotated, the rotating direction of the metal plate contour line moving towards the interior of the vehicle is selected.
Step six, selecting metal plate projection characteristic points and determining a metal plate motion track 8;
referring to fig. 5, the feature points, i.e., the first feature point 10 and the second feature point 11, which are the same in the sheet metal contour line in the two states are connected, and are usually the end points on the same side, so as to generate a line segment, which is the motion trajectory of the sheet metal outer contour in the cross section S.
The vector representing the motion trail of the metal plate comprises two states of the metal plate outline, wherein the initial state is a beta state, namely when the metal plate is tangent to the outline of the sealing strip, the final state is an alpha state, namely the design position of the metal plate.
Referring to fig. 6, the determined vector is an equivalent of the motion trajectory, i.e., a chord is used instead of a circular arc. The principle is that sin theta is approximately equal to theta when the central angle theta of the circular arc is very small. Let chord length be D, arc length be H, and circle radius be R. The chord length D ═ 2R ═ sin (θ/2), the arc length H ═ R ═ θ, and D ≈ H because D ═ 2R ≈ sin (θ/2) ≈ 2R ≈ θ/2 ≈ R ≈ H.
Step seven, equivalently deflecting the section to a standard two-dimensional plane;
referring to fig. 7, a square with the side length of 100mm perpendicular to the Z axis is generated by taking the point O as the center, namely, the square is a standard two-dimensional section P13, and the equivalent deflection of the cross section S12 is performed by utilizing the principle of congruence, so that the sheet metal running track in a standard two-dimensional plane is obtained.
The Z-coordinate of all points in the generated standard two-dimensional plane P is the same.
When the plane equivalent deflection is carried out, the position function is utilized, when two square vertexes are selected, the clockwise direction is adopted in a unified mode, and three vertexes of the square are selected continuously.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A method for determining a metal plate motion track in a two-dimensional section of a vehicle door sealing strip is characterized by comprising the following steps:
step one, establishing a three-dimensional model by using three-dimensional geometric data;
secondly, creating a cross-sectional plane of the sealing strip at the concerned position and generating a contour line of the sealing strip;
cutting the sheet metal data by using the cross section of the sealing strip to obtain a sheet metal profile in the cross section;
step four, determining a vehicle door rotating shaft by using the hinge data;
fifthly, generating projections of the metal plate contour lines in the two states in the cross section;
step six, selecting metal plate projection characteristic points and determining a metal plate motion track;
and seventhly, equivalently deflecting the section to a standard two-dimensional plane.
2. The method for determining the sheet metal movement track in the two-dimensional section of the vehicle door sealing strip according to claim 1, characterized in that the specific method in the first step is as follows:
creating a three-dimensional model in Hypermesh software by using three-dimensional geometric data of a sealing strip (3), a vehicle body metal plate (4), a lower hinge (1) and an upper hinge (2); the three-dimensional geometric data of the sealing strip (3), the automobile body metal plate (4), the lower hinge (1) and the upper hinge (2) are all in a state when the automobile door is closed.
3. The method for determining the sheet metal movement track in the two-dimensional section of the vehicle door sealing strip according to claim 1, wherein the specific method in the second step is as follows:
selecting a point on the outer contour line of the sealing strip (3) at the concerned position, marking as an O point, drawing perpendicular lines of two side contour lines on the outer surface of the sealing strip (3) through the O point, and marking as A, B points when the perpendicular lines and the other two contour lines generate two intersection points; drawing a vertical line to other contour lines by using a point A, B until a closed curve is formed; a square cross section S (12) with O point as the center is generated by using A, B, O points, and the side length L of the square cross section is 100 mm; and projecting the closed curve to a plane to obtain the contour line of the sealing strip in the section.
4. The method for determining the sheet metal movement track in the two-dimensional section of the vehicle door sealing strip according to claim 1, wherein the specific method in the third step is as follows:
the method comprises the steps of cutting metal plate data by utilizing a cross section S (12), wherein the intersection line of the cross section S (12) and a metal plate curved surface is the contour line of a metal plate, selecting a metal plate contour line with a length capable of covering a mounting surface at the top of a sealing strip, projecting the metal plate contour line to the cross section S (12), and recording the metal plate contour line as an alpha-state metal plate contour line (6).
5. The method for determining the sheet metal movement track in the two-dimensional section of the vehicle door sealing strip according to claim 1, wherein the specific method in the fourth step is as follows:
and the rotating shaft (5) of the vehicle door is determined by the centers of the upper hinge hole and the lower hinge hole of the upper hinge (2) and the lower hinge (1) in the hinge data.
6. The method for determining the sheet metal movement track in the two-dimensional section of the vehicle door sealing strip according to claim 1, wherein the concrete method in the fifth step is as follows:
and rotating the alpha-state sheet metal contour line (6) along the rotating shaft (5) to ensure that the projection of the sheet metal contour on the cross section is tangent to the outer contour of the sealing strip (3), and the projection is a beta-state sheet metal contour line (7).
7. The method for determining the sheet metal movement track in the two-dimensional section of the vehicle door sealing strip according to claim 1, wherein the concrete method in the sixth step is as follows:
the characteristic points with the same shape of the metal plate contour lines in the two states are connected, and are usually the end points on the same side, so that a line segment is generated, and the line segment is the motion track of the metal plate outer contour in the cross section S (12).
8. The method for determining the movement track of the sheet metal in the two-dimensional section of the vehicle door sealing strip according to claim 3, characterized in that the concrete method of the seventh step is as follows:
and (3) generating a square with the side length of 100mm perpendicular to the Z axis by taking the point O as the center, namely a standard two-dimensional section P (13), and performing equivalent deflection on the cross section S (12) by utilizing the congruent principle to obtain the metal plate running track in a standard two-dimensional plane.
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| KR102630375B1 (en) * | 2019-01-04 | 2024-01-30 | 현대자동차주식회사 | The weather strip structure of vehicle equipped with opposing sliding doors |
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| KR20020040341A (en) * | 2000-11-24 | 2002-05-30 | 이계안 | The optimize automotive door seal design system and method thereof |
| CN105243189A (en) * | 2015-09-15 | 2016-01-13 | 同济大学 | Vehicle window sealing system equivalent modeling and rapid evaluation method |
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