CN113987869A

CN113987869A - Multi-layer rod end joint grid division method

Info

Publication number: CN113987869A
Application number: CN202111207882.5A
Authority: CN
Inventors: 邓娇; 黄友剑; 王金辉; 彭院中
Original assignee: Zhuzhou Times New Material Technology Co Ltd
Current assignee: Zhuzhou Times New Material Technology Co Ltd
Priority date: 2021-10-18
Filing date: 2021-10-18
Publication date: 2022-01-28

Abstract

The invention discloses a multi-layer rod end joint grid division method, which comprises the following steps: dividing the multi-layer rod end joint into an axisymmetric part and a non-axisymmetric part; performing two-dimensional section processing on the axisymmetric part and performing grid division on the two-dimensional section; rotating the two-dimensional section grid subjected to meshing into a three-dimensional grid to complete meshing of an axisymmetric part to obtain an axisymmetric part three-dimensional grid model; carrying out geometric model processing on the non-axisymmetric part, and carrying out mesh division on the non-axisymmetric part subjected to the geometric model processing to obtain a three-dimensional mesh model of the non-axisymmetric part; assembling and binding the axisymmetric three-dimensional grid model and the non-axisymmetric part three-dimensional grid model to complete the grid division of the multilayer rod end joint; according to the invention, the rod end joint is divided into an axisymmetric part and a non-axisymmetric part, the mesh division work is respectively carried out, and the analysis precision and efficiency are improved by combining outer-dense inner-sparse and free profile processing.

Description

Multi-layer rod end joint grid division method

Technical Field

The invention belongs to the technical field of meshing of finite element analysis, and particularly relates to a multi-layer rod end joint meshing method.

Background

The rod end joint is a flexible connection arranged at the rod end, comprises a connecting rod joint, a traction rod joint and a rotor wing flexible connection, and is widely applied to control and power transmission systems in the fields of rail transit, aerospace and the like; the rod end joint is generally formed by vulcanizing a mandrel, a spacer, an external joint and rubber and is divided into a single-layer rod end joint and a multi-layer rod end joint according to the structural form, wherein the multi-layer rod end joint is a metal rubber vulcanized rod end joint comprising multiple layers of rubber and multiple layers of spacers, and the multi-layer rod end joint has better multi-axis bearing capacity and can simultaneously bear composite loads such as larger radial load, axial load, torsional load, deflection load and the like.

In the development process of the multilayer rod end joint, the fatigue life evaluation of the rod end joint is a very critical item. The fatigue life of the rod end joint is evaluated by a test method and a finite element simulation analysis method, and the finite element simulation analysis method is applied more and more widely at present in consideration of the period and the cost of the test method. A finite element simulation analysis method is adopted to replace a test in the early pre-research and design stages, so that trial production and test times are reduced, the one-time design success rate of the rod end joint is improved, the development period of the rod end joint is shortened, and the development cost of the rod end joint is reduced.

The difficulty of simulation analysis of the fatigue life of the multilayer rod end joint lies in the accuracy and efficiency of analysis, how to ensure the accuracy of a calculation result and improve the efficiency of simulation analysis is ensured, and the grid division is particularly important. According to a conventional meshing method, each layer of rubber and each layer of spacer are divided into two-dimensional and three-dimensional meshes independently, the meshing efficiency of the multi-layer structure rod end joint is low, particularly thirty layers of rubber and spacers are arranged on some rotor flexible connection rod end joints, and only one week of time is needed for meshing, so that the conventional meshing method is difficult to balance and meet the simulation accuracy and efficiency of the multi-layer rod end joint.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a multi-layer rod end joint meshing method, and the problems of low meshing efficiency and low meshing precision of rod end joints are solved by dividing the rod end joints into axisymmetric meshes and non-axisymmetric meshes and respectively carrying out meshing.

The technical scheme adopted for solving the problems in the prior art is as follows:

provided is a multi-layer rod end joint meshing method, comprising:

dividing the multilayer rod end joint into an axisymmetric part and a non-axisymmetric part, wherein the axisymmetric part comprises multilayer rubber and a spacer, and the non-axisymmetric part comprises a mandrel and an outer joint;

performing two-dimensional section processing on the axisymmetric part and performing grid division on the two-dimensional section;

rotating the two-dimensional section grid subjected to meshing into a three-dimensional grid to complete meshing of an axisymmetric part to obtain an axisymmetric part three-dimensional grid model;

carrying out geometric model processing on the non-axisymmetric part, and carrying out mesh division on the non-axisymmetric part subjected to the geometric model processing to obtain a three-dimensional mesh model of the non-axisymmetric part;

and assembling and binding the axisymmetric three-dimensional grid model and the non-axisymmetric part three-dimensional grid model to finish the grid division of the multilayer rod end joint.

Further, the two-dimensional section processing comprises two-dimensional section extraction of the multilayer rubber and the spacer at the axially symmetric part, wherein the extracted part is a half section on the right side of the center line.

Further, the rotation is based on Hypermesh software, and specifically comprises the following steps:

s1, rotating a two-dimensional section grid for 360 degrees around an X axis by using a spin command to obtain a half three-dimensional grid model of an axisymmetric part;

s2, mapping the half three-dimensional grid model by a reflex command in a YZ plane to obtain a complete three-dimensional grid model;

and S3, performing common node processing on the left half three-dimensional grid model and the right half three-dimensional grid model which are obtained through mapping on a YZ plane to obtain the three-dimensional grid model of the axisymmetric part.

Further, the geometric model processing is based on Proe software, and the geometric model processing simplifies the core shaft and the outer joint of the non-axisymmetric part into a quarter of the core shaft and the outer joint.

Further, the meshing of the non-axisymmetric part after the geometric model processing is based on Hypermesh software, and the meshing comprises:

t1, exporting one fourth of stp format files of the mandrel and the outer joint after geometric model simplification, importing the files into Hypermesh software, and carrying out surface meshing and three-dimensional meshing to form one fourth of three-dimensional mesh models of the mandrel and the outer joint;

t2, mapping the quarter of mandrel and outer joint three-dimensional grid division model by an XY plane and a YZ plane by using a reflex command to obtain four quarter of three-dimensional grid models;

and T3, performing common node processing on the four quarter three-dimensional grid models on an XY plane and a YZ plane.

Further, meshing the two-dimensional cross section includes: dividing the two-dimensional section into a plurality of parts from inside to outside, and carrying out grid division according to the density outside and the density inside; the method specifically comprises the following steps:

acquiring a base control point located on the outermost side of the two-dimensional section;

acquiring the distance from the outermost base point to the inner side edge of the two-dimensional section along the X-axis direction, and acquiring a plurality of base control points on the two-dimensional section according to the distance proportion;

taking the plurality of basic control points as starting points to respectively serve as basic control lines, and dividing the two-dimensional section into a plurality of areas;

and respectively carrying out meshing on the plurality of areas.

Preferably, the distance from the outermost basic control point to the inner side edge of the two-dimensional section along the X-axis direction is a vertical distance.

Further, the distance ratio is: a ratio of a vertical distance from the plurality of base control points to the inner side edge of the two-dimensional section along the X-axis direction to a vertical distance from the outermost base control point to the inner side edge of the two-dimensional section along the X-axis direction.

Specifically, the number of the plurality of basic control points is 2, and the basic control points are respectively a first basic control point and a second basic control point, a vertical distance from the outermost basic control point to the inner side edge of the two-dimensional cross section along the X-axis direction is denoted as d, a vertical distance from the first basic control point to the inner side edge of the two-dimensional cross section along the X-axis direction is denoted as e, and a vertical distance from the second basic control point to the inner side edge of the two-dimensional cross section along the X-axis direction is denoted as f, where e =0.8d and f =0.6 d.

Further, a first auxiliary point located on the two-dimensional section and close to the upper side of the outer edge and a second auxiliary point located on the two-dimensional section and close to the lower side of the outer edge are obtained, the first auxiliary point and the second auxiliary point are connected to form an auxiliary line, and the auxiliary line and the Y axis form a basic included angle.

Furthermore, the plurality of basic control points are taken as the starting points to respectively serve as basic control lines, and the included angle formed by the basic control lines and the Y axis is in a proportional relation with the basic included angle.

Specifically, the number of the basic control lines is 2, the basic control lines are respectively a first basic control line and a second basic control line, the basic included angle is recorded as a, the included angle formed by the first basic control line and the Y axis is recorded as b, the included angle formed by the second basic control line and the Y axis is recorded as c, wherein b =0.75a, and c =0.45 a.

Further, the grid cell sizes between the multiple regions are in a proportional relationship.

Specifically, the number of the plurality of regions is 3, and the plurality of regions are respectively a grid refining region, a transition region and a grid coarsening region, wherein the size ratio of grid units in the transition region to the grid refining region is 1.3-1.6, and the size ratio of grid units in the grid refining region in the grid coarsening region is 1.6-2.

Preferably, the grid layer ratio of the grid coarsening area to the grid thinning area is 0.5-0.7.

Further, the gridding of the two-dimensional section also comprises the treatment of a free profile between the rubber and the spacer, wherein the free profile comprises a sharp corner area, and the sharp corner area at least comprises a first arc section and a second arc section which are intersected, a first straight line section which is intersected with the second arc section and a third arc section which is intersected with the other end of the first straight line section;

passivating a sharp corner area of the free profile, wherein the passivating comprises dragging an intersection point of the second arc segment and the first arc segment to the middle point of the first arc segment;

segmenting the free molded surface by taking the middle point of the first circular arc segment, the intersection point of the second circular arc segment and the first straight line segment and the middle point of the third circular arc segment as basic control points;

a basic control line extends from the basic control point to the direction of the rod end joint body, so that a surface area on the inner side of the free profile on the two-dimensional section is cut into a plurality of closed or non-closed sub-surface areas through the basic control line;

and respectively carrying out tetrahedral mesh layout on the sub-surface domains to form a full-section mesh layout.

Further, when a basic control line extends from the midpoint of the first arc segment, the method specifically includes the following steps:

acquiring the midpoint of the first arc segment, the inner side endpoint of the free profile and the midpoint of the second arc segment, and connecting the midpoint and the endpoint of the first arc segment to form a first auxiliary line; connecting the middle point of the second arc segment with the middle point of the first arc segment to form a second auxiliary line; the first auxiliary line and the second auxiliary line form an included angle alpha, the midpoint of the first arc segment is taken as a starting point, and a straight line with an angle of alpha/2 is taken as a first basic control line.

Further, when a base control line extends from the midpoint of the third arc segment, the method specifically includes the following steps:

acquiring the midpoint of the third arc segment, the intersection point of the third arc segment and the first straight line segment, and connecting the midpoint of the third arc segment and the intersection point of the third arc segment and the first straight line segment to form a third auxiliary line; taking the middle point of the third arc segment as a starting point, and making a fourth auxiliary line vertical to the third arc segment; and the third auxiliary line and the fourth auxiliary line form an included angle beta, the midpoint of the third arc segment is taken as a starting point, and a straight line with an angle of beta/3 is taken as a second basic control line.

Furthermore, the method also comprises the step of taking the end point of the second basic control line as a starting point, making a third basic control line parallel to the first straight line segment, and intersecting the first basic control line.

Furthermore, the method also comprises the step of taking the intersection point of the second arc line segment and the first straight line segment as a starting point, making a fourth basic control line parallel to the second basic control line, and intersecting the fourth basic control line with the third basic control line.

Further, the intersection point of the first basic control line and the third basic control line is taken as a starting point, and the middle point of the second arc segment is connected to form a fifth auxiliary line; and taking the intersection point of the third basic control line and the fourth basic control line as a starting point, connecting the midpoint of the fifth auxiliary line and extending to the first basic control line to form a fifth basic control line.

Preferably, the auxiliary line is deleted before the surface area on the two-dimensional section, which is positioned at the inner side of the free profile, is cut into a plurality of closed or non-closed sub-surface areas through the basic control line.

Further, the device also comprises a second straight line section, and the second straight line section is intersected with the first circular arc section.

Still further, the passivation process includes: and dragging the intersection point of the second straight line section and the first circular arc section to the outer end point of the first circular arc section, which is positioned on the free profile.

The beneficial effects are as follows:

1. the rod end joint is divided into an axisymmetric structure and a non-axisymmetric structure for grid division, so that the division efficiency is improved;

2. the grid size of the internal non-key area is decreased progressively by a grid division mode of outer density and inner sparseness so as to control the scale quantity of the whole grid, thereby not only ensuring the calculation precision, but also improving the calculation efficiency;

3. the free profile, particularly the free profile comprising a sharp corner area, is subjected to meshing processing, the precision in the rigidity calculation process of the sharp corner area is improved through passivation processing, the free profile is better subjected to surface area cutting through sectional processing, the meshing of the free profile is more reasonable, the precision in the subsequent finite element analysis and rigidity calculation process of the free profile is further improved, and the calculation efficiency is improved.

Drawings

FIG. 1 is a flowchart of a mesh division method according to the present embodiment;

FIG. 2 is a three-dimensional model of a rod end joint according to the present embodiment;

FIG. 3 is a two-dimensional cross section of an axisymmetric portion of the present embodiment;

FIG. 4 is a grid-divided view of a two-dimensional cross section of an axisymmetric portion of the present embodiment;

FIG. 5 is a three-dimensional mesh model of an axisymmetric portion of the present embodiment;

FIG. 6 is a three-dimensional model of a non-axisymmetric portion of the present embodiment;

FIG. 7 is a three-dimensional mesh division diagram after quarter division of the non-axisymmetric portion of the present embodiment;

FIG. 8 is a three-dimensional mesh partition of a quarter-mapped non-axisymmetric portion of the present embodiment;

FIG. 9 is a diagram illustrating an integrated three-dimensional mesh model after the rod end joint is axisymmetrically and non-axisymmetrically bound according to the present embodiment;

FIG. 10 is a flowchart of a mesh division method with dense outside and sparse inside;

FIG. 11 is a schematic diagram illustrating the division of the multi-layer metal rubber of the present embodiment;

FIG. 12 is a schematic view of the multi-layer metal rubber partition region of the present embodiment;

FIG. 13 is a schematic view of the multi-layer metal rubber partition region of the present embodiment;

FIG. 14 is a schematic diagram illustrating the number of layers and the size of the multi-layer metal rubber mesh;

FIG. 15 is a flow chart illustrating the process of dividing the free-form surface of the rod end joint according to the present embodiment;

FIG. 16 is a schematic view of a rod end joint structure according to the present embodiment;

FIG. 17 is an enlarged view of the free profile of the end joint rubber and spacer structure of the present embodiment;

FIG. 18 is a view of the location of the line segments of the free-form surface of the present embodiment;

FIG. 19 is a graph of the freeform segment point locations for this embodiment;

FIG. 20 is a schematic view showing the acquisition of the auxiliary line of the free profile in the present embodiment;

FIG. 21 is a schematic view of a free profile base control line acquisition of the present embodiment;

FIG. 22 is a schematic diagram illustrating the non-deleted auxiliary line meshing of the free surface according to the present embodiment;

FIG. 23 is a schematic diagram of the meshing of the free-form surfaces of the present embodiment;

in the figure: 1: mandrel, 2: spacer, 3: rubber, 4: outer joint, 5: screw part of outer joint, 6: end face of outer joint, 7: outermost rubber outer surface, 8: innermost rubber inner surface, 9: outer joint inner bore round surface, 10: the excircle surface of the mandrel.

Detailed Description

The present invention will be further described with reference to the following embodiments.

As shown in fig. 1, the present embodiment provides a multi-layer rod end joint meshing method, including:

The three-dimensional model of the rod end joint shown in fig. 2 is analyzed for structural characteristics, and the rod end joint is divided into two parts Z and F which are axisymmetric and non-axisymmetric, wherein the axisymmetric part comprises rubber 3 and a spacer 2, the non-axisymmetric part comprises a mandrel 1 and an outer joint 4, and the outer joint 4 further comprises a screw part 5 of the outer joint and an end surface 6 of the outer joint.

As shown in fig. 3, a two-dimensional cross section is extracted from the rubber 3 and the spacer 2 of the axisymmetric portion Z to generate a dwg file, and then the dwg file is processed by Cad software, and a half cross section on the right side of the center line is taken in consideration of left-right symmetry, that is, fig. 3.

As shown in fig. 3 to 4, a dxf format file is exported to the two-dimensional cross section of the processed axisymmetric portion Z, and the dxf format file is imported into Hypermesh software for mesh division to form a plurality of meshes W divided by lines.

As shown in fig. 5, the completed two-dimensional cross-sectional mesh shown in fig. 4 is rotated 360 degrees around the X-axis by using spin commands in Hypermesh software, so as to obtain a half three-dimensional mesh model of the axisymmetric part; then, mapping the half three-dimensional grid model by a reflex command in a YZ plane to obtain a complete three-dimensional grid model; and then, carrying out common node processing on the nodes of the left and right half three-dimensional grid models on the YZ plane to obtain the three-dimensional grid model of the axisymmetric part Z shown in FIG. 5.

As shown in fig. 6, for the mandrel 1 and the outer joint 4 of the non-axisymmetric portion F, the pro software is used to perform geometric model processing, and the symmetry of the mandrel 1 and the outer joint 4 of the non-axisymmetric portion F is analyzed.

And exporting the geometric models of the mandrel 1 and the outer joint 4 which are one fourth of the processed non-axisymmetric part F from the stp format file, importing the stp format file into Hypermesh software, and performing surface mesh division.

As shown in fig. 7 to 8, the mandrel 1 and the outer joint 4 after the surface meshing is completed are subjected to three-dimensional meshing by using Hypermesh software to obtain a one-fourth three-dimensional mesh model of the non-axisymmetric part F, and then the three-dimensional mesh model is mapped by using a reflex command through an XY plane and a YZ plane to obtain a complete three-dimensional mesh model; and carrying out common node processing on the nodes of the four quarter three-dimensional grid models on the XY plane and the YZ plane to obtain the three-dimensional grid model of the non-axisymmetric part F.

As shown in fig. 9, the obtained three-dimensional mesh model of the axisymmetric portion Z and the three-dimensional mesh model of the non-axisymmetric portion F are assembled; binding the outer surface of the outermost rubber layer and the inner hole circular surface of the outer joint; and binding the inner surface of the innermost rubber layer and the outer circular surface of the mandrel to obtain a grid model of the whole rod end joint, and finishing grid division.

In this embodiment, a method for performing mesh division on a two-dimensional cross section with dense outside and sparse inside is further included, as shown in fig. 10 to 14, the method specifically includes:

acquiring a base control point located on the outermost side of the two-dimensional section; as shown in fig. 11, the outermost base control point in this embodiment is D3, which is the right end point of the innermost rubber inner profile.

As shown in fig. 11, the distance from the outermost base point D3 to the inner side edge of the two-dimensional cross section along the X-axis direction is obtained, in this embodiment, the inner side edges of the two-dimensional cross section are all located on the Y-axis, and the cable distance in this embodiment is the vertical distance, i.e., the vertical distance D from D3 to the Y-axis.

As shown in fig. 11, according to the distance ratio, similarly, the distance ratio in the present embodiment is also the vertical distance ratio, and in the present embodiment, two basic control points D4 and D5 located on the two-dimensional cross section are respectively obtained according to the ratios of e =0.8D and f =0.6D, where e is the distance from the point D4 to the Y axis, and the size f is the distance from the point D5 to the Y axis.

As shown in fig. 11 to 12, two basic control points D4 and D5 are used as starting points to respectively serve as basic control lines L2 and L3, the two-dimensional cross section is divided into three regions S1, S2 and S3, S1 is a region on the right side of L2, S2 is a region between L2 and L3, and S3 is a region between L3 and the Y axis, wherein S1 is a grid thinning region, S2 is a transition region, and S3 is a grid coarsening region;

in this embodiment, as shown in fig. 11, before making the basic control lines L2 and L3, a first auxiliary point D1 located on the two-dimensional cross section and near the upper side of the outer edge and a second auxiliary point D2 located on the two-dimensional cross section and near the lower side of the outer edge are obtained, and an auxiliary line L1 is formed by connecting the first auxiliary point D1 and the second auxiliary point D2.

In this embodiment, as shown in fig. 11, the auxiliary line L1 forms a basic angle a with the Y axis, the angle formed by L2 with the Y axis is denoted as b, the angle formed by L3 with the Y axis is denoted as c, and the proportional relationship of b =0.75a and c =0.45a is satisfied.

In this embodiment, as shown in fig. 12 to 14, in the process of dividing the three regions S1, S2, and S3, the sizes of the grid cells are in a proportional relationship, specifically: the grid cell size ratio between the transition region S2 and the grid refinement region S1 is 1.5, and the grid cell size ratio between the grid coarsening region S3 and the grid refinement region S1 is 2; in this embodiment, the size of the grid cells in the area S1 is 0.3, the size of the grid cells in the area S2 is 0.45, and the size of the grid cells in the area S3 is 0.6.

In this embodiment, as shown in fig. 14, the ratio of the mesh layer between the mesh coarsening area S3 and the mesh thinning area S1 is 0.5 and 0.7, respectively, according to the difference of the rubber and spacer materials; specifically, the number of the grids at the leftmost end of the rubber in the grid thinning region S1 is 6, the number of the grids at the leftmost end of the rubber in the grid coarsening region S2 is reduced to 3, the number of the grids at the leftmost end of the spacers in the grid thinning region S1 is 3, and the number of the grids at the leftmost end of the spacers in the grid coarsening region S2 is reduced to 2.

In the embodiment, the grid size is decreased progressively for the non-key area in the multilayer metal rubber part through the grid division mode of dense outside and sparse inside so as to control the scale quantity of the whole grid, thereby not only ensuring the calculation precision, but also improving the calculation efficiency.

In this embodiment, the method for meshing the free-form surface further includes, as shown in fig. 15 to 23, the method including: and obtaining the two-dimensional section C of the rod end joint and the free profile enlarged image C'.

As shown in fig. 18, the free profile includes a sharp corner region a, and in this embodiment, the sharp corner region a includes a first circular arc segment R01 and a second circular arc segment R02 which intersect each other, a first straight segment L1 which intersects the second circular arc segment R02, a third circular arc segment R03 which intersects the other end of the first straight segment L1, and a second straight segment L2 which intersects the first circular arc segment R01.

As shown in fig. 19, the sharp corner region a of the free profile is passivated, including dragging the intersection of the second arc segment R02 and the first arc segment R01 to the midpoint P1 of the first arc segment R01; and dragging the intersection point of the second straight line segment L2 and the first circular arc segment R01 to the position, where the first circular arc segment R01 is positioned at the outer end point P2 of the free profile.

In this embodiment, the free profile is segmented by taking a midpoint P1 of a first arc segment R01, an intersection point P3 of a second arc segment R02 and a first straight line segment L1, and a midpoint P4 of a third arc segment R03 as basic control points;

a basic control line extends from the basic control point to the direction of the rod end joint body, so that a surface area on the two-dimensional section, which is positioned on the inner side of the free profile, is cut into a plurality of closed sub-surface areas and non-closed sub-surface areas through the basic control line; the rod end joint body in this embodiment is oriented to the left.

The specific partitioning method in this embodiment is as follows:

1. when a basic control line extends from a midpoint P1 of the first circular arc segment R01, the method specifically comprises the following steps:

as shown in fig. 20 to 21, a midpoint P1 of the first arc segment R01, an inner end point P5 of the free profile, and a midpoint P6 of the second arc segment R02 are obtained, and a midpoint P1 and an end point P5 of the first arc segment R01 are connected to form a first auxiliary line L1'; connecting a midpoint P6 of the second circular arc segment R02 with a midpoint P1 of the first circular arc segment R01 to form a second auxiliary line L2'; the first auxiliary line L1 'and the second auxiliary line L2' form an included angle α, a midpoint P1 of the first arc segment R01 is taken as a starting point, and a straight line with an angle α/2 is taken as a first basic control line B1.

2. As shown in fig. 20 to 21, when the base control line extends from the midpoint P4 of the third arc segment R03, the method specifically includes the following steps:

acquiring intersection points of a midpoint P4 of a third arc segment R03, a third arc segment R03 and a first straight line segment L1, and connecting a midpoint P4 of the third arc segment R03 and an intersection point P7 of a third arc segment R03 and the first straight line segment L1 to form a third auxiliary line L3'; taking a midpoint P4 of the third arc segment R03 as a starting point, and making a fourth auxiliary line L4' perpendicular to the third arc segment R03; the third auxiliary line L3 'forms an included angle beta with the fourth auxiliary line L4', and a straight line with an angle beta/3 is taken as a second basic control line B2 by taking the midpoint P4 of the third arc segment R03 as a starting point.

3. As shown in fig. 21, starting from the end point P8 of the second basic control line B2, parallel to the first straight line segment L1, a third basic control line B3 is made, intersecting with the first basic control line B1 and intersecting with P9.

4. As shown in fig. 21, a fourth basic control line B4 parallel to the second basic control line B2 is made to intersect the third basic control line B3 with the intersection point P10 of the second arc segment R02 and the first straight segment L1 as a starting point.

5. As shown in fig. 21 to 23, a fifth auxiliary line L5' is formed by connecting a midpoint P6 of the second arc segment R02 with an intersection point P9 of the first basic control line B1 and the third basic control line B3 as a starting point; a fifth base control line B5 is formed starting from an intersection P11 of the third base control line B3 and the fourth base control line B4, connecting the midpoints of the fifth auxiliary lines L5' and extending to the first base control line B1.

As shown in fig. 21 to 23, in the present embodiment, the basic control lines B1 to B5 cut the surface area located inside the free-form surface on the two-dimensional cross section into a plurality of closed sub-surface areas, and delete the auxiliary lines; and finishing the meshing of the free profile.

It should be understood that the above examples are only for clearly illustrating the technical solutions of the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection of the claims of the present invention.

Claims

1. A multi-layer rod end joint meshing method, comprising:

2. The method according to claim 1, wherein the two-dimensional cross-sectional processing comprises two-dimensional cross-sectional extraction of the multi-layer rubber and the spacers of the axially symmetric portion, the extracted portion being a half cross-section to the right of the centerline.

3. The method for meshing the rod end joint of the multilayer according to claim 1, wherein the rotation is based on Hypermesh software, and specifically comprises the following steps:

4. The method according to claim 1, wherein the geometric model process is based on Proe software, and wherein the geometric model process reduces the mandrel and outer joint of the non-axisymmetric portion to one-quarter mandrel and outer joint.

5. The multi-layer rod end joint meshing method according to claim 1, wherein the meshing of the non-axisymmetric part after the geometric model processing is based on Hypermesh software, and comprises:

6. The multi-layer rod end joint meshing method of claim 1, wherein meshing the two-dimensional cross-section comprises: dividing the two-dimensional section into a plurality of parts from inside to outside, and carrying out grid division according to the density outside and the density inside; the method specifically comprises the following steps:

and respectively carrying out meshing on the plurality of areas.

7. The method according to claim 6, wherein the outermost base control point is a vertical distance from an inner side edge of the two-dimensional cross-section along the X-axis direction.

8. The multi-layer rod end joint meshing method of claim 6, further comprising: acquiring a first auxiliary point which is positioned above the two-dimensional section and close to the outer edge and a second auxiliary point which is positioned below the two-dimensional section and close to the outer edge, and connecting the first auxiliary point and the second auxiliary point to form an auxiliary line, wherein the auxiliary line and the Y axis form a basic included angle;

and taking the plurality of basic control points as starting points to respectively serve as basic control lines, wherein the included angle formed by the basic control lines and the Y axis is in a proportional relation with the basic included angle.

9. The method of claim 1, wherein meshing the two-dimensional cross-section further comprises processing a free profile between the rubber and the spacer, the free profile including a sharp corner region including at least a first arc segment and a second arc segment that intersect, a first straight segment that intersects the second arc segment, and a third arc segment that intersects the other end of the first straight segment;