CN116663187A - Parameterization deformation method for multi-pitch tire pattern - Google Patents

Parameterization deformation method for multi-pitch tire pattern Download PDF

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Publication number
CN116663187A
CN116663187A CN202310652250.2A CN202310652250A CN116663187A CN 116663187 A CN116663187 A CN 116663187A CN 202310652250 A CN202310652250 A CN 202310652250A CN 116663187 A CN116663187 A CN 116663187A
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pattern
pitch
points
groove
module
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陈思汇
李宁
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Triangle Tyre Co Ltd
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Triangle Tyre Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T17/00—Three dimensional [3D] modelling, e.g. data description of 3D objects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Theoretical Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Evolutionary Computation (AREA)
  • Computer Hardware Design (AREA)
  • General Engineering & Computer Science (AREA)
  • Pure & Applied Mathematics (AREA)
  • Mathematical Optimization (AREA)
  • Mathematical Analysis (AREA)
  • Computational Mathematics (AREA)
  • Computer Graphics (AREA)
  • Software Systems (AREA)
  • Tires In General (AREA)

Abstract

The invention relates to a parameterization deformation method of a multi-pitch tire pattern, and belongs to the field of tire design. Firstly, analyzing and processing each key point of a tire pattern vector diagram with one pitch, then changing each key point of the pattern vector diagram according to the principle that the relative angle of a pattern groove is kept unchanged and the saturation of each pitch pattern is stable so as to generate patterns with other deformed pitches, and finally, generating a three-dimensional structure characteristic model of each pattern groove according to a preset pattern drawing angle and groove depth, wherein the model can be used for building a three-dimensional model of a multi-pitch tire through a series of other transformation and refinement works. The method is based on Grasshopper to realize parameterized data analysis and graph generation, and can also be realized based on other platforms and programming modes. The method can treat a plurality of grooves at one time, has visual deformation effect, ensures the shape and characteristics of the multi-pitch tire patterns, can set the saturation value after the overall pattern is finished in advance, and effectively improves the drawing efficiency and modeling efficiency of the multi-pitch patterns.

Description

Parameterization deformation method for multi-pitch tire pattern
Technical Field
The invention relates to the field of tire design, in particular to a parameterized deformation method of a multi-pitch tire pattern.
Background
As is well known, the pattern design of a multi-pitch tire is based on a certain pitch design, and the design of other pitch grooves is completed according to the overall size proportion of other pitches. The groove angles of all pitches are generally required to be kept relatively unchanged after deformation, and the saturation of the patterns in each pitch is basically the same, so that the whole circumferential performance of the tire is stable, and therefore, the deformation and design of the multi-pitch tire pattern are important steps in the design flow of the tire pattern.
At present, the pattern of a multi-pitch tire is designed, a CAD parameterized design is mainly applied to combine with manual adjustment to design grooves with multiple pitches, the pattern is deformed by sequentially adjusting characteristic values of the grooves, and whether saturation of each pitch is stable or not is calculated after each pitch is integrally drawn. On one hand, the method has the defects of complex operation flow and low efficiency, the stability of the characteristics such as the saturation of each pitch is difficult to ensure by the design result at one time, and the design result is also subjected to high randomness by manual adjustment. The invention provides a flexible, simple and convenient multi-pitch pattern deformation method, which can simultaneously process deformation of a plurality of pattern grooves, automatically capture key points of patterns and analyze and process data, thereby improving design efficiency; and the design method is beneficial to the establishment and implementation of the initial design target, so that the final design result is easier to control within the design target range.
The Chinese patent application (publication No. CN106021669A publication No. 20161012) discloses a parameterized design system and method for tire pattern, wherein the pattern design is divided into a pattern groove design module, a pattern groove intersection processing module, an ornament design module and an auxiliary modeling module for operation, and the three-dimensional design is used as a design basis to wind a three-dimensional curved surface and regenerate the surface, so that the establishment of a three-dimensional model is realized. For the establishment of the multi-pitch tire model, the automatic assembly unit is still established on the thought that single pitch is respectively designed and recombined, but is not established on the thought that after the overall design target is clear, patterns with multiple pitches are parameterized and deformed according to the target.
Chinese patent application (publication No. CN109325298A publication No. 20190212) discloses a tire pattern design system based on a three-dimensional design platform, which comprises data management, pattern layer management, pattern aided design and pattern performance evaluation functions. The pattern auxiliary design module mainly generates a three-dimensional structure by parameterizing and controlling all three-dimensional characteristic values of the pattern grooves, and the problem of deformation of the pattern of the multi-pitch tire is not involved; secondly, the design thought of the pattern groove provided by the patent is difficult to implement if no data exists in the sketch construction stage because a large amount of structural characteristic values are input first to generate a scheme.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a parameterized deformation method of a multi-pitch tire pattern, which can be used for rapidly generating pattern patterns and three-dimensional models with different pitches.
The technical scheme adopted for solving the technical problems is as follows: the parameterized deformation method of the multi-pitch tire pattern is realized based on Grasshopper to realize parameterized data analysis and graph generation or other platforms and programming modes, can process graphs and three-dimensional models, uniformly set and adjust all parameters, and uniformly process input graphs, and is characterized by comprising the following steps:
a. preprocessing the pattern vector graph of the pattern groove, wherein the pattern groove is closed by connecting straight lines at the opening part of the pattern groove, so that all the input pattern groove graphs are ensured to be closed;
b. inputting all processed pattern groove vector graphics at a pattern input end of a program, and automatically selecting all key points in the graphics by the program, wherein all points capable of controlling the feature change of the graphics are included;
c. extracting key point coordinate values of each inputted pattern groove vector graph from a key point sequencing module of the program, sequencing the coordinate values by the module, and finally enabling key points of the upper left corner of the graph to be 1 number key points, and sequentially and backwards sequencing the key points to be 2, 3, … to the last n number key points according to a clockwise sequence;
d. inputting grouping judgment sensitivity X into a key point grouping module, and sequentially calculating the absolute value k of the slope of every two adjacent key point connecting lines according to the result of a sequencing module 1 、k 2 …k n-1 Comparing the magnitudes of the values with X in turn, if k is present a If the number is greater than X, extracting k a Corresponding to the serial numbers a and a+1 of the two points, the "a" point is givenAll the points before are divided into positioning groups, and the points after are divided into change groups;
e. inputting a pitch number to be designed, a dimension common ratio or tolerance between pitches and the like into a pitch target module, and thus calculating a dimension ratio S between a target pitch and an initial pitch;
f. inputting a deformation step e and an allowable tolerance value C in an area fitting module, sequentially moving key points of a change group, judged by all pattern blocks in the grouping module, up or down once according to the deformation step e by utilizing a circulation structure, calculating the ratio P of the deformed area to the initial area of a pattern groove, comparing the absolute value of P-S with the value of C until the absolute value of P-S is less than C, terminating circulation, sequentially connecting the key points of the positioning group and the change group, connecting the key points end to end, and outputting a pattern groove vector graph after the change, namely the pattern groove profile meeting the change requirement;
g. and inputting groove depth information and pattern drawing angle information into a three-dimensional generation module, and generating a three-dimensional initial model of the groove by using the changed groove plane graph, wherein the model can be used for further generating a multi-pitch three-dimensional model.
The key points comprise all points capable of controlling the graphic features, and deformed graphics are generated through connecting lines among the points, wherein the connecting lines comprise curves and straight lines.
The deformation is to keep the relative angle of the grooves unchanged and the saturation of each pitch pattern stable.
The selection of the number 1 point can also be set by oneself.
The key point of the upper left corner can be set manually.
The moving mode of the key points of the change group adopts an area step-by-step fitting method, or an equation is solved by using a shoelace theorem of any polygonal area calculation formula, so that the required extracted deformation is obtained once.
The invention has the advantages that the drawing and modeling of the multi-pitch tire pattern can be more flexible and simple, the invention is very suitable for sketch design and development work of new patterns of the multi-pitch tire, can simultaneously process deformation of a plurality of pattern grooves, can automatically capture key points of the pattern and analyze and process data, and improves the design efficiency; and in addition, the design method is beneficial to formulating and implementing an initial design target in the design process, so that a final design result is highly matched with the design target, and the design scheme is easier to control within the design target range.
Drawings
The invention will be further described with reference to the drawings and examples.
FIG. 1 is a groove vector graphics preprocessing effect.
FIG. 2 is a key point ordering module result.
FIG. 3 is a variation group key selected by the key point grouping module.
Fig. 4 is an area fitting module deformation result.
FIG. 5 is a three-dimensional structure of one of the grooves generated by the three-dimensional generation module.
Fig. 6 is a program flow chart of a multi-pitch tire pattern deformation method.
Detailed Description
The invention realizes parameterized data analysis and graph generation based on Grasshopper, can also be realized based on other platforms and programming modes, and has the key points that the graph and the three-dimensional model can be simply and conveniently processed, a plurality of grooves can be processed at one time, the deformation effect is visual, all parameters can be uniformly set and adjusted, and then the input graph is uniformly processed.
The method is used for parameterizing to realize the rapid generation of the pattern two-dimensional graph of the multi-section tyre and the modeling of the three-dimensional structure of the pattern groove.
The present invention is further described below by way of an example, and the present embodiment is implemented on the premise of the technical solution of the present invention, but the scope of protection of the present invention is not limited to the following embodiments.
In the embodiment, a two-dimensional vector diagram of grooves with a plurality of pitches is taken as input, and grooves with other pitches, which are changed according to the overall proportion change of the pitches, are finally obtained, wherein the two-dimensional vector diagram comprises two-dimensional patterns and three-dimensional structure models of the grooves.
When inputting, the pattern vector graphics of the pattern grooves are preprocessed, as shown in fig. 1, the pattern grooves are closed by connecting straight lines at the openings, so that all the pattern grooves are closed, in the example, the longitudinal grooves are straight grooves, the area of the longitudinal grooves can be changed linearly according to the integral proportion change of the pitch, and therefore, only the pattern transverse grooves can be input in the example; if this condition is not satisfied, the trench should be divided into one or more closed patterns and then treated similarly.
Inputting all processed pattern groove vector graphics at a pattern input end of a program, wherein the embodiment adopts a CP battery to select all key points in the graphics, and can also adopt other modes to select the key points, wherein the key points comprise all points capable of controlling the feature change of the graphics, and each key point is initially randomly numbered;
the key point coordinate values of the input pattern groove vector graphics are extracted from a key point sorting module of the program, the module sorts the coordinate values, the key points at the upper left corner of the graphics are finally made to be 1 number points through adjusting initial random number control, and the key points are sequentially and backwards arranged to be 2, 3, … to the last n number key points in a clockwise order, and the sorting result is shown in fig. 2.
Inputting grouping judgment sensitivity X into a key point grouping module, and sequentially calculating the absolute value k of the slope of every two adjacent key point connecting lines according to the result of a sequencing module 1 、k 2 …k n-1 Comparing the magnitudes of the values with X in turn, if k is present a If the number is greater than X, extracting k a The number a and the number a+1 of the corresponding two points are divided into positioning groups by the point a and all the points before the point a, the points after the point a are divided into change groups, and the key points of the selected change groups are shown in figure 3;
inputting a pitch number to be designed, a dimension common ratio or tolerance between pitches and the like into a pitch target module, and thus calculating a dimension ratio S between a target pitch and an initial pitch;
the method comprises the steps of inputting a deformation step e and an allowable tolerance value C in an area fitting module, sequentially moving key points of a change group, judged by all pattern blocks in the grouping module, up or down once according to the deformation step e by utilizing an Anemone cycle battery, calculating the ratio P of the deformed area to the initial area of a pattern groove, comparing the absolute value of P-S and the size of C until the absolute value of P-S is less than C, terminating the cycle, sequentially connecting key points of a positioning group and the change group end to end, outputting a pattern vector graph after the change, namely the pattern groove profile meeting the change requirement, for example, the deformation result from a 1 number pitch to a 3 number pitch is shown as a figure 4, the black solid line is the initial 1 number pitch pattern groove profile, and the gray pattern block part is the deformed 3 number pitch pattern groove profile.
Sequentially inputting trench depth information and pattern drawing angle information into a three-dimensional generation module, and generating a three-dimensional initial model of the trench by using the changed trench plane graph, wherein the model can be used for further generating a multi-pitch three-dimensional model, as shown in fig. 5, the three-dimensional structure shows basic characteristics of the trench, and the model can be further used for building a multi-pitch tire model.
A program flow chart embodying this embodiment is shown in fig. 6.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. The generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention 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 (5)

1. The parameterized deformation method of the multi-pitch tire pattern is realized based on Grasshopper to realize parameterized data analysis and graph generation or other platforms and programming modes, can process graphs and three-dimensional models, uniformly set and adjust all parameters, and uniformly process input graphs, and is characterized by comprising the following steps:
a. preprocessing the pattern vector graph of the pattern groove, wherein the pattern groove is closed by connecting straight lines at the opening part of the pattern groove, so that all the input pattern groove graphs are ensured to be closed;
b. inputting all processed pattern groove vector graphics at a pattern input end of a program, and automatically selecting all key points in the graphics by the program, wherein all points capable of controlling the feature change of the graphics are included;
c. extracting key point coordinate values of each inputted pattern groove vector graph from a key point sequencing module of the program, sequencing the coordinate values by the module, and finally enabling key points of the upper left corner of the graph to be 1 number key points, and sequentially and backwards sequencing the key points to be 2, 3, … to the last n number key points according to a clockwise sequence;
d. inputting grouping judgment sensitivity X into a key point grouping module, and sequentially calculating the absolute value k of the slope of every two adjacent key point connecting lines according to the result of a sequencing module 1 、k 2 …k n-1 Comparing the magnitudes of the values with X in turn, if k is present a If the number is greater than X, extracting k a The number a and the number a+1 of the corresponding two points are divided into a positioning group by the point a and all the points before the point a, and the points after the point a are divided into a change group;
e. inputting a pitch number to be designed, a dimension common ratio or tolerance between pitches and the like into a pitch target module, and thus calculating a dimension ratio S between a target pitch and an initial pitch;
f. inputting a deformation step e and an allowable tolerance value C in an area fitting module, sequentially moving key points of a change group, judged by all pattern blocks in the grouping module, up or down once according to the deformation step e by utilizing a circulation structure, calculating the ratio P of the deformed area to the initial area of a pattern groove, comparing the absolute value of P-S with the value of C until the absolute value of P-S is less than C, terminating circulation, sequentially connecting the key points of the positioning group and the change group, connecting the key points end to end, and outputting a pattern groove vector graph after the change, namely the pattern groove profile meeting the change requirement;
g. and inputting groove depth information and pattern drawing angle information into a three-dimensional generation module, and generating a three-dimensional initial model of the groove by using the changed groove plane graph, wherein the model can be used for further generating a multi-pitch three-dimensional model.
2. The method for parameterizing and deforming a multi-pitch tire tread of claim 1, wherein the key points comprise all points capable of controlling the graphic features, and the deformed graphic is generated by connecting lines between the points, wherein the connecting lines comprise curves and straight lines.
3. A method of parametric deformation of multi-pitch tire patterns as in claim 1 wherein said deformation is maintaining the relative angle of the grooves constant and the saturation of each pitch pattern constant.
4. The method for parameterizing and deforming a multi-pitch tire tread of claim 1, wherein the selection of the "1" points is also self-settable.
5. The method for parameterizing and deforming a multi-pitch tire tread of claim 1, wherein the key point of the "upper left corner" is manually settable.
CN202310652250.2A 2023-06-05 2023-06-05 Parameterization deformation method for multi-pitch tire pattern Pending CN116663187A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310652250.2A CN116663187A (en) 2023-06-05 2023-06-05 Parameterization deformation method for multi-pitch tire pattern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310652250.2A CN116663187A (en) 2023-06-05 2023-06-05 Parameterization deformation method for multi-pitch tire pattern

Publications (1)

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CN116663187A true CN116663187A (en) 2023-08-29

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