Method for dynamic evaluation of tread pattern saturation based on pattern analysis techniques

Abstract

The application relates to a kind of tread pattern saturation dynamic evaluation methods based on pattern analysis technology, belong to tire pattern design field.Draw the vector graphics of tire pattern block and steel sheet, and ensure that the contour line of all pattern blocks and steel sheets is closed and can be separated from each other;All pattern block contours X are imported into the pattern block contour input end of Grasshopper saturation fluctuation range measurement program, and the tire pattern with steel sheet is imported into the steel sheet contour input end of all steel sheet contours Y;The input includes: the calculation starting area contour M0 is imported into the starting contour input end, the region contraction iteration number n is input into the iteration number input end, and the iteration step a is input into the iteration step input end;The saturation value is sequentially marked in the coordinate system by Construct Point, and then each marked point is connected by PolyLine, so as to form the saturation change curve.The application can improve the efficiency of pattern design process, and can quickly exclude the pattern scheme with large saturation fluctuation range.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tire pattern design, in particular to a method for dynamically evaluating the tread pattern saturation degree based on graphic analysis technology. BACKGROUND

[0002] It is known that the tire tread pattern saturation degree is one of the important parameters of tire pattern design. Evaluating the pattern design scheme from the perspective of tire tread pattern saturation degree can to some extent predict the performance characteristics of the tire. Therefore, the tire tread pattern saturation degree is an important object to be investigated in the early stage of pattern design.

[0003] At present, the main means for evaluating the tire saturation degree is to divide the grid, calculate the number of grids occupied by the pattern block and the pattern groove, and then estimate the saturation degree value. Or directly calculate the area in the CAD software, and then estimate the saturation degree value. On the one hand, these methods are time-consuming and inefficient. On the other hand, if the saturation degree is calculated based on the tire design running surface width, there will be some uncertainty between the actual contact area of the real inflated tire and the actual contact area, and it is difficult to predict the dynamic change range of the saturation degree in the actual situation. Chinese invention patent application (application publication number: CN112115549A publication date: 20200910) discloses a method for calculating the two-dimensional land-sea ratio of tire pattern based on image recognition. This method needs to convert the tire pattern into a black and white picture, and uses black and white colors to distinguish pattern blocks, pattern grooves and steel sheets. The pattern saturation degree is calculated by counting the black and white pixel points. The pre-processing needs to process the tire pattern into a black and white picture. If the input is in the form of a tire photo, the processing process of the photo is relatively complicated. If the input is in the form of a CAD drawing or a plane drawing, the drawing process is also time-consuming and laborious. The calculation process needs to identify and count each pixel point. If the picture is large, the calculation amount will become huge. The calculation needs to predefine the calculation range. When the calculation range is modified, all operations need to be re-executed, and the saturation degree cannot flexibly respond to the change of the calculation range.

[0004] Chinese invention patent application (publication number: CN108509673A publication date: 20180907) discloses a method for calculating the block land-sea ratio of the tread pattern based on image processing technology. This method needs to divide the pattern drawing into a plurality of closed blocks, and use the closed blocks to represent the pattern blocks. Each closed block is composed of a plurality of straight line segments and circular arcs. The land-sea ratio is calculated by analyzing the area of the closed region in the two-dimensional drawing. The pre-processing needs to ensure that all the lines constituting the pattern meet the calculation requirements, which is time-consuming and laborious. The closed region containing closed grooves or steel sheets cannot be identified. The program considers that the closed region is a pattern block, or leads to incorrect calculation results of the pattern with steel sheets. When calculating, a calculation range needs to be predefined. If the range changes, all operations need to be re-executed, and the saturation degree cannot efficiently respond to the change of the calculation range. SUMMARY

[0005] In order to overcome the deficiencies of the prior art, the present application provides a method for dynamically evaluating the tread pattern saturation based on a graphic analysis technique, which can be used to quickly calculate and evaluate the change of the tire tread pattern saturation to meet the needs of tire pattern designers.

[0006] The technical solution adopted by the present application to solve its technical problems is: a method for dynamically evaluating the tread pattern saturation based on a graphic analysis technique, characterized by comprising the following steps:

[0007] (1). Draw the vector graphics of the tire pattern blocks and the steel sheets, and ensure that the contour lines of all the pattern blocks and the steel sheets are closed and can be separated from each other;

[0008] (2). Import all the pattern block contour lines X into the pattern block contour input end of the Grasshopper saturation fluctuation range calculation program, and import all the steel sheet contour lines Y into the steel sheet contour input end for the tire pattern with steel sheets;

[0009] (3). Input the calculation parameters at the calculation parameter input end, including: importing the calculation starting area contour M0 at the starting contour input end, inputting the iteration number n of the area contraction at the iteration number input end, and inputting the iteration step a at the iteration step input end;

[0010] (4). Input the design judgment parameters at the design judgment parameter input end, including: inputting the design judgment range R at the range input end, inputting the saturation design lower limit S at the design lower limit input end, and inputting the saturation design upper limit S at the design upper limit input end; min ; max ;

[0011] (5). The saturation calculation module generates a surface through Boundary from the contour lines, separates different areas through Rdiff, and then calculates the areas of the separated parts through Area. First, calculate the area A of the starting area contour M0 all0 Subtract the area of the steel sheet contour Y within the range of M0 to obtain the area A0 of the area M0 without steel sheets, then calculate the area A of the starting area contour M0 all0 Subtract the area of the pattern block contour X within the range of M0 to obtain the area B0 of the pattern groove within the area M0, and finally A0 minus B0 to obtain A rib0 , A rib0 / A all0 , and obtain the value S0 of the saturation;

[0012] (6). Obtain the equidistant scaling contours M1, M2…M n, this process can be used with Series, input iteration step a and iteration number n, to generate the required offset distance of Offset Curve step changes;

[0013] (7). By the process described in (5) and (6), through the iteration step a and the iteration number n, the sequence of S0, S1…S n can be calculated as a whole;

[0014] (8). In the design judgment module, use Bounds to cooperate with Deconstruct Domain to obtain the maximum and minimum values of S0, S1…S n , and the difference R is obtained by subtraction, and then compared with the judgment range value to determine whether it meets the preset range of difference. Use Includes to combine the counting tool to determine whether S0, S1…S n are all within the design lower limit S min and the design upper limit S max . According to the determination result, output whether the saturation meets the difference design requirement, whether the saturation is within the design range;

[0015] (9). The saturation values are marked in the coordinate system in turn through Construct Point, and each marked point is connected through PolyLine to form the saturation change curve.

[0016] The application can also be realized by the following measures:

[0017] The vector diagram of the tire pattern block and the steel sheet is drawn, and the closed contour is drawn by CAD, AI or Rhino, and then imported into the Grasshopper program for parameterization calculation and analysis.

[0018] The starting contour input end is introduced into the calculation starting area contour M0, and the calculation starting area contour M0 of any shape can be set, the iteration number n and the iteration step a are set, and the saturation dynamic change under different contour shape region conditions can be flexibly calculated and analyzed.

[0019] The application has the advantages of high calculation efficiency, flexible calculation method, improved efficiency of pattern design process, rapid elimination of pattern scheme with large saturation fluctuation range, reduced work difficulty, reduced tread pattern import requirements, flexible change and adjustment of calculation range, and can be used for rapid calculation and evaluation of the change of the saturation of the tire tread pattern. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application will be further described below in combination with the drawings and examples.

[0021] Figure 1 is the closed contour map of the pattern block and the pattern groove, the starting area contour M0 and its iterations of 10 area borders.

[0022] Figure 2 is the area corresponding to A0, A1, A2…A9.

[0023] Figure 3 is the area corresponding to B0, B1, B2…B9.

[0024] Figure 4 is the saturation series calculated by the saturation calculation module.

[0025] Figure 5 is the determination result output by the design determination module.

[0026] Figure 6 is the saturation change curve.

[0027] Figure 7 is the flow chart of the tread pattern saturation dynamic evaluation program.

[0028] Figure 8 is the calculation iteration area changed to a horizontal strip slice, the left side of the figure is the horizontal segmentation effect of the pattern, and the right side of the figure is the saturation change curve of the horizontal strip slice from top to bottom.

[0029] Figure 9 is the calculation iteration area changed to a vertical strip slice, the left side of the figure is the vertical segmentation effect of the pattern, and the right side of the figure is the saturation change curve of the vertical strip slice from left to right. DETAILED DESCRIPTION

[0030] The method of the present application is used to calculate and evaluate the dynamic change of the saturation of various types of tire patterns.

[0031] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0032] (1) Draw the vector graphics of the tire pattern block and the steel sheet, and ensure that the contour lines of all the pattern blocks and the steel sheet are closed and can be separated from each other;

[0033] (2) Import all the pattern block contours X into the pattern block contour input end of the Grasshopper saturation fluctuation range measurement program, and for the tire pattern with a steel sheet, import all the steel sheet contours Y into the steel sheet contour input end;

[0034] (3) Input the calculation parameters at the calculation parameter input end, including: importing the calculation starting area contour M0 at the starting contour input end, inputting the number of iterations n of the area shrinkage iteration at the iteration number input end, and inputting the iteration step a at the iteration step input end;

[0035] (4) In the design of the decision parameter input includes: in the range of input design decision range R, in the design of the lower limit of the input saturation design lower limit value S min And in the design of the upper limit of the input saturation design upper limit S max ;

[0036] (5) Saturation calculation module through the Boundary contour line generation surface, and then through the Rdiff different areas are segmented, and then through the Area calculation each part after segmentation area. First calculate the starting area contour M0 area A all0 Subtract the area of the steel sheet contour Y in the range of M0 to get the area A0 of the area M0 without steel sheet, and then calculate the area A of the starting area contour M0 all0 Subtract the area of the pattern block contour X in the range of M0 to get the area B0 of the area M0 in the pattern groove, and finally A0 minus B0 to get A rib0 , A rib0 / A all0 Get the value of saturation S0;

[0037] (6) By Offset Curve get the offset contour M1, M2…M n of the starting area contour M0, this process can be used with Series, input iteration step a and iteration number n, to generate the required gradual change of offset distance of Offset Curve;

[0038] (7) through the process described in (5) and (6), through the iteration step a and iteration number n, the sequence of S0, S1…S n can be calculated as a whole;

[0039] (8) in the design of the decision module, with Bounds cooperate Deconstruct Domain get the maximum and minimum of S0, S1…S n , subtract to get the range R, and then compare with the decision range value to determine whether it meets the preset range. With Includes combined with the counting tool, to determine whether S0, S1…S n are all in the design lower limit S min And the design of the upper limit of S max Range;

[0040] (9) further, through the Construct Point, the saturation value is marked in the coordinate system in turn, and then through the PolyLine, each marked point is connected, so as to form the saturation change curve.

[0041] The vector diagram depicting the tire pattern block and the steel sheet is depicted by CAD, AI or Rhino software capable of depicting vector graphics to depict a closed contour, and then imported into the Grasshopper program for parametric calculation and analysis.

[0042] The starting profile input end is imported into the calculation starting area profile M0, and the calculation starting area profile M0 of any shape can be set, the iteration number n of the area shrinkage and the iteration step a are set, and the saturation degree dynamic change under different profile shape area conditions is flexibly calculated and analyzed.

[0043] As a further extension of this method, for the tire pattern without steel sheet, A rib0 The area A all0 of the calculation starting area profile M0 is calculated, and the area B0 of the groove in the area M0 is subtracted to obtain A rib0 / A all0 The value S0 of the saturation degree is obtained, and the same determination process is performed.

[0044] As a further extension of this method, the starting area profile M0 is set as a long strip-shaped rectangle with parameter-controlled width and height, the above iteration process is changed to an iteration process that can be translated horizontally and vertically according to the integer multiple of the side length of the long strip-shaped rectangle, the change of the saturation degree in the rectangular slice range arranged horizontally and vertically in the tire pattern can be calculated, and whether the determination result according to the above determination method meets the expectation is determined.

[0045] The present application will be further described by examples, and the embodiments are implemented on the premise of the technical solutions of the present application, but the protection scope of the present application is not limited to the following embodiments.

[0046] In this embodiment, the vector diagram of the tire tread pattern contour is input, and finally the saturation degree change sequence in the preset dynamic change range, the saturation degree sequence range determination result, the saturation degree change range determination result, and the saturation degree change curve are obtained.

[0047] After inputting the closed contour graph of the pattern block and the groove and the starting area profile, as Figure 1 At this time, according to the iteration number of area shrinkage 10 and the iteration step 0.5mm, 10 change ranges that need to be calculated have been generated.

[0048] The saturation degree calculation module generates a profile line by Boundary, and then separates different areas by Rdiff, and then calculates the area of each part after separation by Area. The area A N of the calculation area profile M allN is calculated, and the area of the steel sheet profile Y in the range M N is subtracted to obtain the area of the area M NArea A inside the innermost area without steel sheet N The implementation example of the present application is as follows Figure 2 The areas corresponding to A0, A1, A2…A9 can be seen, due to the influence of the middle overlapping part, the color block gray level gradually increases from outside to inside; the area A of the starting area contour M N is calculated allN Subtract the area of the pattern block contour X in the range of M N to obtain the area M N The area B of the pattern groove inside M N The implementation example of the present application is as follows Figure 3 The areas corresponding to B0, B1, B2…B9 can be seen, due to the influence of the middle overlapping part, the color block gray level gradually increases from outside to inside. Finally, A N Subtract B N to obtain A ribN The saturation value S is obtained by A ribN / A allN ; N ;

[0049] The obtained saturation change sequence {S N} is as follows Figure 4 The numbers in the “{}” are the saturation values in the range of starting area contours M0 to M9 from top to bottom.

[0050] The result of the design judgment module is as follows Figure 5 “True” means that the judgment standard is met; “False” means that the judgment standard is not met.

[0051] The saturation curve drawing module draws the curve of the saturation change sequence {S N} as follows Figure 6 The bottom horizontal line is 0, and the “cross” in the figure represents each point on the curve, from which the trend of the saturation of the pattern decreasing from outside to inside can be roughly judged.

[0052] The above-described tire pattern saturation dynamic evaluation program flow can be seen in detail in Figure 7 , which mainly solves the dynamic evaluation and analysis of the saturation change of the pattern design scheme under the condition that the actual ground contact range of the pneumatic tire is uncertain during the early design of the tire pattern. As a further functional extension of this method, the initial calculation range and the calculation iteration mode can be flexibly adjusted for calculating and analyzing the saturation of the horizontal and vertical slices of the tire pattern, and the specific implementation effects are as follows Figure 8 and Figure 9 .

[0053] The present application adopts the above technical scheme, the pretreatment only needs to outline each part of the tire pattern to form a closed contour, any vector graphics drawing software can be used for operation. Then the area is calculated by importing the Grasshopper program, the calculation accuracy is high, the calculation range can be flexibly adjusted according to actual needs, and the determination result is output, so that the work efficiency is improved, and the difficulty of the work is reduced.

[0054] The above is the description of the embodiments of the present application. Through the above description of the disclosed embodiments, those skilled in the art can implement or use the present application. Various modifications of the embodiments will be apparent to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for dynamically evaluating the tread pattern saturation based on a pattern analysis technique, characterized in that, It comprises the following steps: (1). Draw the vector graphics of the tire blocks and the steel sheet, and ensure that the contour lines of all the blocks and the steel sheet are closed and can be separated from each other; (2). Import all the block contour X into the block contour input end of the Grasshopper saturation fluctuation range calculation program, and import all the steel sheet contour Y into the steel sheet contour input end for the tire pattern with the steel sheet; (3). Input the calculation parameters at the calculation parameter input end, including: importing the calculation starting area contour M0 into the starting contour input end, inputting the area contraction iteration number n into the iteration number input end, and inputting the iteration step a into the iteration step input end; (4). In the design of the input end of the decision parameter includes: in the range of input end of the design of the difference value R, in the design of the lower limit of the input end of the saturation design lower limit value S min And in the design of the upper limit of the input end of the saturation design upper limit S max ; (5). The saturation calculation module generates a contour line through Boundary, separates different areas through Rdiff, and then calculates the area of each part after separation through Area. First, the area A of the starting area contour M0 is calculated all0 Subtract the area of the steel sheet contour Y within the range of the starting area contour M0 to obtain the area A0 of the starting area contour M0 without steel sheet, and then calculate the area A of the starting area contour M0 all0 Subtract the area of the pattern block contour X within the range of the starting area contour M0 to obtain the area B0 of the starting area contour M0, and finally A0 minus B0 to obtain A rib0 , A rib0 / A all0 to obtain the value S0 of the saturation degree; (6). Get equidistant scaled profiles M1, M2…M of the starting area profile M0 from Offset Curve n This process can be used in conjunction with Series, input iteration step a and iteration number n, to generate the required step changes in offset distance for Offset Curve; (7). Through the process described in (5) and (6), through the iteration step a and the iteration number n, the value S0, S1…S n of the saturation degree S0, S1…S (8). In the design determination module, the value S0, S1…S of saturation is obtained by Bounds cooperating with Deconstruct Domain n , the maximum and minimum values in the above are subtracted to obtain the range R, and then compared with the determination range value to determine whether it meets the preset range, and the value S0, S1…S of saturation is determined by Includes combined with the counting tool n whether all of them are within the lower limit S min and the upper limit S max of the design, according to the determination result, whether the saturation meets the range design requirement and whether the saturation is within the design range is output. (9). Mark the saturation values in the coordinate system in sequence by Construct Point, and then connect each marked point by PolyLine, so as to form the saturation change curve.

2. The method for dynamic evaluation of tread pattern saturation based on pattern analysis techniques according to claim 1, characterized in that The vector graphics of the tire blocks and the steel sheet are drawn by selecting one of the software capable of drawing vector graphics, such as CAD, AI or Rhino, to generate the vector graphics of the tire blocks and the steel sheet respectively, and then importing them into the Grasshopper program for parameterized calculation and analysis.

3. The method for dynamic evaluation of tread pattern saturation based on pattern analysis techniques according to claim 1, characterized in that The calculation starting area contour M0 imported into the starting contour input end can be set to have an arbitrary shape, and the area contraction iteration number n and the iteration step a can be set flexibly, so that the dynamic saturation change under different contour shape area conditions can be calculated and analyzed.

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