Racket frame strength test data analysis method and system based on data collaboration

Abstract

The invention discloses a racket frame strength test data analysis method and system based on data collaboration, and relates to the technical field of material strength analysis. According to the method, the material rigidity of the racket frame in different directions is accurately analyzed through the reference direction weight coefficient, a basis is provided for subsequent ball hitting point selection, the racket surface area is divided through ball hitting scene simulation, the ball hitting test parameters are determined in combination with the reference direction weight coefficient, the test is closer to the real use condition, and the test efficiency is improved. And the maximum stress information of the racket frame is obtained through finite element analysis and is compared with a material strength threshold value to judge whether the racket frame is qualified or not, so that a scientific and accurate basis is provided for strength evaluation of the racket frame, and the stability and the reliability of the strength test of the racket frame are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of material strength analysis, and particularly to a data collaboration-based data analysis method and system for testing the strength of a racket frame. Background Art

[0002] With the introduction of the concept of national health, healthy sports are becoming more and more popular among people. Sports can not only exercise the body but also regulate the mood. In sports, using a good racket is very important. Whether it is professional athletes or amateur enthusiasts, for sports goods such as tennis rackets, badminton rackets, and squash rackets, they tend to pursue the effect of light weight. However, to ensure sports safety, on the premise of light weight, the racket must also have a certain strength. These two are often a pair of contradictory requirements. Therefore, when producing a racket, it is necessary to test the strength of the racket frame to ensure the reliability of the product.

[0003] At present, there are still problems in testing the strength of the racket frame. It is often impossible to accurately test the strength of the racket frame. Usually, direct traditional racket strength tests such as top pressure tests and side pressure tests are used to conduct strength tests in a single direction, which cannot reflect the complex mechanical behaviors of the racket under multi-directional forces such as impact, torsion, and shear during actual hitting. This may cause the racket to perform well in the top pressure test, but in actual use, the racket frame may deform or break due to insufficient lateral stiffness. When testing the racket hitting, it is impossible to accurately set appropriate hitting parameters. If direct hitting detection is carried out on all positions, not only is the detection cost high, but the amount of data is also relatively large. Summary of the Invention

[0004] To solve the above technical problems, a data collaboration-based data analysis method and system for testing the strength of a racket frame are provided. The technical solution solves the problems proposed in the above background art, that is, it is impossible to accurately test the strength of the racket frame. Usually, direct traditional racket strength tests such as top pressure tests and side pressure tests are used to conduct strength tests in a single direction, which cannot reflect the complex mechanical behaviors of the racket under multi-directional forces such as impact, torsion, and shear during actual hitting. This may cause the racket to perform well in the top pressure test, but in actual use, the racket frame may deform or break due to insufficient lateral stiffness. When testing the racket hitting, it is impossible to accurately set appropriate hitting parameters. If direct hitting detection is carried out on all positions, not only is the detection cost high, but the amount of data is also relatively large.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A data collaboration-based data analysis method for testing the strength of a racket frame, comprising: Obtaining racket frame material information, where the racket frame material information includes racket frame material type information and corresponding material property parameter information; Obtain the elastic modulus of the material according to the racket frame material information; Conduct a basic strength test on the racket frame to obtain basic strength test data. The basic strength test includes a top pressure test and a side pressure test; Obtain the reference direction weight coefficient according to the basic strength test data and the elastic modulus of the material; Based on the simulation of the hitting scenario, divide the racket face area to obtain racket face area information; Obtain the hitting test parameter information corresponding to each racket face area according to the reference direction weight coefficient and the racket face area information; Conduct a hitting test on the racket according to the hitting test parameter information to obtain hitting test data; Judge whether the racket frame strength test is qualified according to the hitting test data. If not, adjust the racket frame. If so, the racket frame strength is qualified.

[0006] Preferably, the conducting a basic strength test on the racket frame to obtain basic strength test data specifically includes: Connect any two positions on the racket frame and measure the distance of the connecting line segment; Take the two positions with the largest connecting line segment distance on the racket frame as the first feature point and the second feature point. The first feature point represents the position far from the racket throat among the two positions with the largest connecting line segment distance on the racket frame, and the second feature point represents the position close to the racket throat among the two positions with the largest connecting line segment distance on the racket frame; Take the connecting line segment of the first feature point and the second feature point as the reference line segment; Take the two positions of the connecting line segment that is perpendicular to the reference line segment and has the largest connecting line segment distance as the third feature point and the fourth feature point, and take the intersection of the connecting line segment of the third feature point and the fourth feature point and the reference line segment as the center of the racket frame; Place the racket frame in a posture with the connecting line of the first feature point and the second feature point vertically downward, take the first feature point as the pressure contact point, and slowly and uniformly press the racket frame until it breaks to obtain the top pressure test data. The top pressure test data includes the top pressure value and the top pressure deformation; Among them, the top pressure deformation represents the maximum change in the distance between the first feature point and the second feature point during the top pressure test; Place the racket frame in a posture with the connecting line of the third feature point and the fourth feature point vertically downward, take the third feature point as the pressure contact point, and slowly and uniformly press the racket frame until it breaks to obtain the side pressure test data. The side pressure test data includes the side pressure value and the side pressure deformation; Obtain the basic strength test data according to the top pressure test data and the side pressure test data.

[0007] Preferably, obtaining the reference direction weight coefficient according to the basic strength test data and the material elastic modulus specifically includes: Obtaining the top pressure value and the side pressure value according to the basic strength test data; Obtaining the predicted top pressure change amount and the predicted side pressure change amount according to the material elastic modulus, the top pressure value and the side pressure value, where the predicted top pressure change amount is the ratio of the top pressure value to the material elastic modulus, and the predicted side pressure change amount is the ratio of the side pressure value to the material elastic modulus; Taking the connection line from the second feature point to the first feature point as the first reference direction, and taking the difference between the predicted top pressure change amount and the top pressure deformation amount as the deformation difference of the first reference direction; Taking the connection line from the fourth feature point to the third feature point as the second reference direction, and taking the difference between the predicted side pressure change amount and the side pressure deformation amount as the deformation difference of the second reference direction; Obtaining the reference direction weight coefficient according to the ratio of the deformation difference of the first reference direction to the deformation difference of the second reference direction; Among them, the reference direction weight coefficient is specifically: In the formula, is the weight coefficient of the first reference direction, is the weight coefficient of the second reference direction, is the deformation difference of the first reference direction, is the deformation difference of the second reference direction.

[0008] Preferably, dividing the racket face area based on the simulated hitting scenario to obtain the racket face area information specifically includes: Based on the simulated hitting scenario, hitting the ball with different hitting technical actions to obtain the position information of the hitting points on the racket face; According to the position information of the hitting points on the racket face, matching each position information of the hitting points on the racket face with the corresponding hitting technical action information; Classifying the hitting technical action information based on the technical action type to obtain the hitting technical action classification information, where the technical action types include smash actions, drop shot actions and attacking shot actions; Taking the hitting technical action classification information as the reference, classifying the position information of the hitting points on the racket face to obtain the classification information of the hitting points on the racket face; According to the classification information of the hitting points on the racket face, taking any hitting point on each type of hitting points on the racket face as the area initial point of the corresponding type of hitting points on the racket face; Performing area expansion with the area initial point until the area covers all the hitting points on the racket face corresponding to the classification of the hitting points on the racket face where the area initial point is located, to obtain the racket face area information; Among them, the racket face area information includes the racket face area and the corresponding technical movement type.

[0009] Preferably, obtaining the hitting test parameter information corresponding to each racket face area according to the reference direction weight coefficient and the racket face area information specifically includes: Obtain the center of the racket frame, the first reference direction, and the second reference direction; Taking the center of the racket frame as the origin and the first reference direction and the second reference direction as the coordinate axis directions, establish a plane rectangular coordinate system; According to the racket face area information, calculate the hitting point matching index for any position within the racket face area; Taking the position with the maximum hitting point matching index as the racket hitting point of this racket face area; Based on the technical movement type, obtain the conventional hitting data corresponding to each technical movement type. The conventional hitting data includes the ball speed change amount, the mass of the ball, the contact time between the ball and the racket face, and the angle between the movement direction of the ball and the racket face; According to the conventional hitting data, obtain the hitting force information corresponding to each technical movement type. The hitting force information includes the magnitude and direction of the hitting force; Taking the hitting force information corresponding to each technical movement type as the hitting test force information for the racket face area corresponding to this technical movement type; According to the racket hitting point and the hitting test force information, obtain the hitting test parameter information; Among them, the calculation formula of the hitting point matching index is: In the formula, is the hitting point matching index, is the first reference direction weight coefficient, is the second reference direction weight coefficient, is the coordinate of the hitting point.

[0010] Preferably, judging whether the racket frame strength test is qualified according to the hitting test data specifically includes: Model the racket frame to obtain the racket frame model information; According to the racket frame model information, obtain the shell element model; Obtain the racket frame stringing material information. The racket frame stringing material information includes the longitudinal elastic modulus of the stringing material, the transverse modulus of the stringing material, and the shear modulus of the stringing material; According to the racket frame stringing material information, taking the hitting test parameter information as the load condition for input, based on finite element analysis (FEA), obtain the maximum stress information of the racket frame; According to the racket frame material information, obtain the material strength threshold; Based on the maximum stress information of the racket frame and the material strength threshold, determine whether the racket frame strength test is qualified. If the maximum stress of the racket frame does not exceed the material strength threshold, the racket frame strength is qualified; if the maximum stress of the racket frame exceeds the material strength threshold, the racket frame strength is unqualified, and adjust the racket design.

[0011] Furthermore, a data collaboration-based data analysis system for racket frame strength testing is proposed to implement the above analysis method, including: A main control module, which is used to obtain the predicted top pressure change amount and the predicted side pressure change amount according to the material elastic modulus, the top pressure value and the side pressure value. Taking the line connecting the second feature point to the first feature point as the first reference direction, taking the difference between the predicted top pressure change amount and the top pressure deformation amount as the deformation difference in the first reference direction. Taking the line connecting the fourth feature point to the third feature point as the second reference direction, taking the difference between the predicted side pressure change amount and the side pressure deformation amount as the deformation difference in the second reference direction. According to the ratio of the deformation difference in the first reference direction to the deformation difference in the second reference direction, obtain the reference direction weight coefficient. Based on the simulation of the hitting scenario, divide the racket face area to obtain the racket face area information. According to the reference direction weight coefficient and the racket face area information, obtain the hitting test parameter information corresponding to each racket face area. According to the hitting test data, judge whether the racket frame strength test is qualified; An information acquisition module, which is used to acquire the racket frame material information, the racket frame material type information and the corresponding material property parameter information. According to the racket frame material information, obtain the material elastic modulus. Connect any two positions on the racket frame to measure the distance of the connecting line segment, and obtain the racket frame stringing material information, the longitudinal elastic modulus of the stringing material, the transverse modulus of the stringing material and the shear modulus of the stringing material; A strength test module, which is used to place the racket frame in a posture with the line connecting the first feature point and the second feature point vertically downward, take the first feature point as the pressure contact point, and press the racket frame slowly and uniformly until the racket breaks to obtain the top pressure test data. Place the racket frame in a posture with the line connecting the third feature point and the fourth feature point vertically downward, take the third feature point as the pressure contact point, and press the racket frame slowly and uniformly until the racket breaks to obtain the side pressure test data. Model the racket frame to obtain the racket frame model information. According to the racket frame model information, obtain the shell element model. Using the hitting test parameter information as the load condition for input, based on the finite element analysis (FEA), obtain the maximum stress information of the racket frame; A display module, which interacts with the main control module and is used to output and display the basic strength test data, the reference direction weight coefficient, the racket face area information, the hitting test parameter information and the hitting test data.

[0012] Optionally, the main control module specifically includes: A control unit, which is configured to divide the racket face area based on the batting scenario simulation, obtain the racket face area information, obtain the batting test parameter information corresponding to each racket face area according to the reference direction weight coefficient and the racket face area information, and determine whether the racket frame strength test is qualified according to the batting test data; An information receiving unit, which interacts with the information acquisition module and the strength test module, and is configured to receive data and transmit it to the evaluation unit; An evaluation unit, which is configured to obtain the predicted top pressure change amount and the predicted side pressure change amount according to the material elastic modulus, the top pressure value, and the side pressure value. Taking the line connecting the second feature point to the first feature point as the first reference direction, taking the difference between the predicted top pressure change amount and the top pressure deformation amount as the deformation difference in the first reference direction, taking the line connecting the fourth feature point to the third feature point as the second reference direction, taking the difference between the predicted side pressure change amount and the side pressure deformation amount as the deformation difference in the second reference direction, and obtaining the reference direction weight coefficient according to the ratio of the deformation difference in the first reference direction to the deformation difference in the second reference direction.

[0013] Optionally, the information acquisition module specifically includes: A first acquisition unit, which is configured to obtain the racket frame material information, the racket frame material type information, and the corresponding material performance parameter information, obtain the material elastic modulus according to the racket frame material information, connect any two positions on the racket frame, and measure the distance of the connecting line segment; A second acquisition unit, which is configured to obtain the racket frame stringing material information, the longitudinal elastic modulus of the stringing material, the transverse modulus of the stringing material, and the shear modulus of the stringing material.

[0014] Optionally, the strength test module specifically includes: A basic strength test unit, which is configured to place the racket frame in a posture with the line connecting the first feature point and the second feature point vertically downward, use the first feature point as the pressure contact point, apply a uniform and slow top pressure to the racket frame until the racket breaks, obtain the top pressure test data, place the racket frame in a posture with the line connecting the third feature point and the fourth feature point vertically downward, use the third feature point as the pressure contact point, apply a uniform and slow side pressure to the racket frame until the racket breaks, and obtain the side pressure test data; A batting test unit, which is configured to model the racket frame, obtain the racket frame model information, obtain the shell element model according to the racket frame model information, input the batting test parameter information as the load condition, and obtain the maximum stress information of the racket frame based on the finite element analysis (FEA).

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a data collaboration-based data analysis method and system for testing the strength of a racket frame. By accurately analyzing the material stiffness of the racket frame in different directions through the benchmark direction weight coefficient, it provides a basis for the subsequent selection of the hitting point. By simulating the hitting scenario to divide the racket surface area and combining the benchmark direction weight coefficient to determine the hitting test parameters, the test is made closer to the actual use situation, improving the effectiveness of the test. By obtaining the maximum stress information of the racket frame through finite element analysis and comparing it with the material strength threshold to determine whether it is qualified, it provides a scientific and accurate basis for the strength evaluation of the racket frame, ensuring the stability and reliability of the racket frame strength test. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a flowchart of a data analysis method for testing the strength of a racket frame based on data collaboration proposed by the present invention; Figure 2 is a flowchart for obtaining basic strength test data in the present invention; Figure 3 is a flowchart for obtaining the benchmark direction weight coefficient in the present invention; Figure 4 is a flowchart for obtaining racket surface area information in the present invention; Figure 5 is a structural block diagram of a data analysis system for testing the strength of a racket frame based on data collaboration proposed by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations.

[0018] Referring to Figure 1 - Figure 4 As shown, a data analysis method for testing the strength of a racket frame based on data collaboration in an embodiment of the present invention includes: Obtain racket frame material information, where the racket frame material information includes racket frame material type information and corresponding material property parameter information; According to the racket frame material information, obtain the material elastic modulus; Conduct a basic strength test on the racket frame to obtain basic strength test data, where the basic strength test includes a top pressure test and a side pressure test; Specifically, conducting a basic strength test on the racket frame to obtain basic strength test data specifically includes: Connect any two positions on the racket frame and measure the distance of the connecting line segment; Take the two positions with the largest distance between the connected line segments on the racket frame as the first feature point and the second feature point. The first feature point represents the position among the two positions with the largest distance between the connected line segments on the racket frame that is far from the throat of the racket frame, and the second feature point represents the position among the two positions with the largest distance between the connected line segments on the racket frame that is close to the throat of the racket frame; Take the connected line segment between the first feature point and the second feature point as the reference line segment; Take the two positions of the connected line segment that is perpendicular to the reference line segment and has the largest distance between the connected line segments as the third feature point and the fourth feature point, and take the intersection point of the connected line segment between the third feature point and the fourth feature point and the reference line segment as the center of the racket frame; Place the racket frame in a posture with the connected line between the first feature point and the second feature point vertically downward, take the first feature point as the pressure contact point, and press the racket frame slowly and evenly until the racket breaks to obtain the top pressure test data. The top pressure test data includes the top pressure value and the top pressure deformation amount; Among them, the top pressure deformation amount represents the maximum change amount of the distance between the first feature point and the second feature point during the top pressure test; Place the racket frame in a posture with the connected line between the third feature point and the fourth feature point vertically downward, take the third feature point as the pressure contact point, and press the racket frame slowly and evenly until the racket breaks to obtain the side pressure test data. The side pressure test data includes the side pressure value and the side pressure deformation amount; Obtain the basic strength test data according to the top pressure test data and the side pressure test data.

[0019] In this solution, by measuring the longest diagonal line (the first / second feature point) of the racket frame and the longest line segment in the vertical direction (the third / fourth feature point), the geometric center and the main force direction of the racket are determined. By obtaining the fracture load (top pressure value / side pressure value) and the deformation amount of the racket frame in the main direction through the top pressure and side pressure tests, the accurate evaluation of the material stiffness of the racket frame in different directions is realized, providing a data basis for the subsequent calculation of the weight coefficient.

[0020] Obtain the reference direction weight coefficient according to the basic strength test data and the material elastic modulus; Specifically, obtaining the reference direction weight coefficient according to the basic strength test data and the material elastic modulus specifically includes: Obtain the top pressure value and the side pressure value according to the basic strength test data; Obtain the predicted top pressure change amount and the predicted side pressure change amount according to the material elastic modulus, the top pressure value and the side pressure value. The predicted top pressure change amount is the ratio of the top pressure value to the material elastic modulus, and the predicted side pressure change amount is the ratio of the side pressure value to the material elastic modulus; Taking the line connecting the second feature point to the first feature point as the first reference direction, and taking the difference between the predicted top pressure change and the top pressure deformation as the deformation difference in the first reference direction; Taking the line connecting the fourth feature point to the third feature point as the second reference direction, and taking the difference between the predicted side pressure change and the side pressure deformation as the deformation difference in the second reference direction; Obtaining the reference direction weight coefficient according to the ratio of the deformation difference in the first reference direction to the deformation difference in the second reference direction; Among them, the reference direction weight coefficient is specifically: In the formula, is the first reference direction weight coefficient, is the second reference direction weight coefficient, is the deformation difference in the first reference direction, is the deformation difference in the second reference direction.

[0021] In this solution, by obtaining the predicted top pressure change and the predicted side pressure change according to the material elastic modulus, the top pressure value and the side pressure value, taking the difference between the predicted top pressure change and the top pressure deformation as the deformation difference in the first reference direction, taking the difference between the predicted side pressure change and the side pressure deformation as the deformation difference in the second reference direction, obtaining the reference direction weight coefficient according to the ratio of the deformation difference in the first reference direction to the deformation difference in the second reference direction, reflecting the material nonlinearity or structural design defect through the difference between the predicted top / side pressure change (theoretical deformation) and the measured deformation, and quantifying the strength priority of different directions through the weight coefficient.

[0022] It can be understood that through traditional racket strength tests such as top pressure test and side pressure test, only the racket frame strength in the unit direction can be tested. However, in the actual use process of the racket, the stress condition of the racket frame is often complex and changeable. Therefore, quantifying the strength of the racket frame in different directions through the weight coefficient provides a basis for subsequent racket hitting tests.

[0023] Based on the simulation of the hitting scenario, dividing the racket face area to obtain the racket face area information; Specifically, based on the simulation of the hitting scenario, dividing the racket face area to obtain the racket face area information, which specifically includes: Based on the simulation of the hitting scenario, hitting the ball with different hitting technical actions to obtain the racket face hitting point position information; According to the racket face hitting point position information, matching each racket face hitting point position information with the corresponding hitting technical action information; Based on the type of technical action, classifying the hitting technical action information to obtain the hitting technical action classification information, and the types of technical actions include smashing actions, dropping actions and pouncing actions; Based on the batting technical movement classification information, classify the hitting point position information on the racket face to obtain the racket face hitting point classification information; According to the racket face hitting point classification information, take any hitting point on each type of racket face hitting point as the area initial point of this type of racket face hitting point; Expand the area with the area initial point until the area covers all the racket face hitting points corresponding to the racket face hitting point classification of the area initial point, and obtain the racket face area information; Among them, the racket face area information includes the racket face area and the corresponding technical movement type.

[0024] In this solution, through the simulation of the batting scenario, simulate batting with different batting technical movements, obtain the hitting point position on the racket face corresponding to each batting technical movement, classify the batting technical movements by the technical movement type, and according to the classification result, classify the racket face hitting points corresponding to the batting technical movements to obtain the racket face hitting point classification information. Take any hitting point on each type of racket face hitting point as the area initial point of this type of racket face hitting point, and expand the area with the area initial point until the area covers all the racket face hitting points corresponding to the racket face hitting point classification of the area initial point, and obtain the racket face area information; It can be understood that by dividing the racket face into functional areas such as the smash area and the drop shot area, the test is closer to the actual use scenario. Different batting actions (such as smashes requiring high explosive power) have different intensity requirements for different areas. By dividing the areas of different batting actions, the racket face areas corresponding to each type of batting technical movement are formed, improving the evaluation accuracy and providing a basis for subsequent batting tests.

[0025] According to the reference direction weight coefficient and the racket face area information, obtain the hitting test parameter information corresponding to each racket face area; Specifically, according to the reference direction weight coefficient and the racket face area information, obtain the hitting test parameter information corresponding to each racket face area, which specifically includes: Obtain the center of the racket frame, the first reference direction, and the second reference direction; Taking the center of the racket frame as the origin and the first reference direction and the second reference direction as the coordinate axis directions, establish a plane rectangular coordinate system; According to the racket face area information, calculate the hitting point matching index for any position within the racket face area; Take the position with the maximum hitting point matching index as the racket hitting point of this racket face area; Based on the technical movement type, obtain the conventional hitting data corresponding to each technical movement type, and the conventional hitting data includes the ball speed change amount, the mass of the ball, the contact time between the ball and the racket face, and the angle between the movement direction of the ball and the racket face; According to the conventional hitting data, hitting force information corresponding to each type of technical movement is obtained, and the hitting force information includes the magnitude and direction of the hitting force. The hitting force information corresponding to each type of technical movement is used as the hitting test force information for the racket face area corresponding to the type of technical movement. According to the hitting point of the racket and the hitting test force information, hitting test parameter information is obtained. Among them, the calculation formula for the hitting point matching index is: In the formula, is the hitting point matching index, is the weight coefficient of the first reference direction, is the weight coefficient of the second reference direction, is the coordinate of the hitting point.

[0026] In this solution, by taking the center of the racket frame as the origin and the first reference direction and the second reference direction as the coordinate axis directions, a plane rectangular coordinate system is established, and the hitting point matching index is calculated for any position within the racket face area. The position with the maximum hitting point matching index is used as the racket hitting point of the racket face area, that is, the racket hitting point corresponding to the type of technical movement of each racket face area. The hitting force information corresponding to each type of technical movement is used as the hitting test force information for the racket face area corresponding to the type of technical movement. According to the racket hitting point and the hitting test force information, hitting test parameter information is obtained. It can be understood that the hitting test parameter information selects a suitable hitting point, avoiding the huge amount of data caused by directly testing all positions and accurately testing the strength of the racket frame.

[0027] It should be noted that the magnitude of the hitting force , the direction of the hitting force is opposite to the movement direction of the ball, is the mass of the ball, is the change in ball speed, is the contact time between the ball and the racket face.

[0028] According to the hitting test parameter information, the racket is subjected to a hitting test to obtain hitting test data. According to the hitting test data, it is judged whether the racket frame strength test is qualified. If not, the racket frame is adjusted. If so, the racket frame strength is qualified.

[0029] Specifically, according to the hitting test data, judging whether the racket frame strength test is qualified specifically includes: Modeling the racket frame to obtain racket frame model information. Obtain the shell element model according to the racket frame model information; Obtain the racket frame stringing material information, where the racket frame stringing material information includes the longitudinal elastic modulus of the stringing material, the transverse modulus of the stringing material, and the shear modulus of the stringing material; According to the racket frame stringing material information, take the hitting test parameter information as the load condition for input, and based on finite element analysis (FEA), obtain the maximum stress information of the racket frame; Obtain the material strength threshold according to the racket frame material information; According to the maximum stress information of the racket frame and the material strength threshold, determine whether the racket frame strength test is qualified. If the maximum stress of the racket frame does not exceed the material strength threshold, the racket frame strength is qualified. If the maximum stress of the racket frame exceeds the material strength threshold, the racket frame strength is unqualified, and adjust the racket design.

[0030] In this solution, through the shell element model and the stringing material parameters (elastic modulus, shear modulus), reproduce the hitting test in the finite element software, predict the maximum stress distribution of the racket frame, compare the maximum stress with the material strength threshold (such as the tensile strength of carbon fiber 4000MPa), determine whether the design meets the standard. If the stress exceeds the limit, adjust the carbon fiber ply angle or wall thickness to avoid the high-cost trial and error of physical testing.

[0031] Refer to Figure 5 As shown, further, in combination with the above-mentioned data collaboration-based racket frame strength test data analysis method, a data collaboration-based racket frame strength test data analysis system is proposed, including: The main control module is used to obtain the predicted change in top pressure and the predicted change in side pressure according to the material elastic modulus, the top pressure value, and the side pressure value. Take the line connecting the second feature point to the first feature point as the first reference direction, take the difference between the predicted change in top pressure and the top pressure deformation as the deformation difference in the first reference direction. Take the line connecting the fourth feature point to the third feature point as the second reference direction, take the difference between the predicted change in side pressure and the side pressure deformation as the deformation difference in the second reference direction. According to the ratio of the deformation difference in the first reference direction and the deformation difference in the second reference direction, obtain the reference direction weight coefficient. Based on the hitting scenario simulation, divide the racket face area to obtain the racket face area information. According to the reference direction weight coefficient and the racket face area information, obtain the hitting test parameter information corresponding to each racket face area. According to the hitting test data, determine whether the racket frame strength test is qualified; An information acquisition module, which is used to acquire racket frame material information, racket frame material type information, and corresponding material performance parameter information. According to the racket frame material information, the material elastic modulus is obtained. Any two positions on the racket frame are connected by a line, the distance of the connecting line segment is measured, and the racket frame stringing material information, the longitudinal elastic modulus of the stringing material, the transverse modulus of the stringing material, and the shear modulus of the stringing material are obtained; A strength test module, which is used to place the racket frame in a posture with the line connecting the first feature point and the second feature point vertically downward, use the first feature point as the pressure contact point, and slowly press the racket frame evenly until the racket breaks to obtain the top pressure test data. Place the racket frame in a posture with the line connecting the third feature point and the fourth feature point vertically downward, use the third feature point as the pressure contact point, and slowly press the racket frame evenly until the racket breaks to obtain the side pressure test data. Model the racket frame to obtain the racket frame model information. According to the racket frame model information, obtain the shell element model, input the hitting test parameter information as the load condition, and based on the finite element analysis (FEA), obtain the maximum stress information of the racket frame; A display module, which interacts with the main control module and is used to output and display the basic strength test data, the reference direction weight coefficient, the racket face area information, the hitting test parameter information, and the hitting test data.

[0032] The main control module specifically includes: A control unit, which is used to divide the racket face area based on the simulated hitting scenario to obtain the racket face area information. According to the reference direction weight coefficient and the racket face area information, obtain the hitting test parameter information corresponding to each racket face area. According to the hitting test data, judge whether the racket frame strength test is qualified; An information receiving unit, which interacts with the information acquisition module and the strength test module and is used to receive data and transmit it to the evaluation unit; An evaluation unit, which is used to obtain the predicted top pressure change amount and the predicted side pressure change amount according to the material elastic modulus, the top pressure value, and the side pressure value. Take the line connecting the second feature point to the first feature point as the first reference direction, and take the difference between the predicted top pressure change amount and the top pressure deformation amount as the deformation difference in the first reference direction. Take the line connecting the fourth feature point to the third feature point as the second reference direction, and take the difference between the predicted side pressure change amount and the side pressure deformation amount as the deformation difference in the second reference direction. According to the ratio of the deformation difference in the first reference direction and the deformation difference in the second reference direction, obtain the reference direction weight coefficient.

[0033] The information acquisition module specifically includes: A first acquisition unit, which is configured to acquire racket frame material information, racket frame material type information, and corresponding material property parameter information, acquire the material elastic modulus according to the racket frame material information, connect any two positions on the racket frame, and measure the distance of the connected line segment; A second acquisition unit, which is configured to acquire racket frame stringing material information, longitudinal elastic modulus of the stringing material, transverse modulus of the stringing material, and shear modulus of the stringing material.

[0034] A strength test module, specifically including: A basic strength test unit, which is configured to place the racket frame in a posture with the line connecting the first feature point and the second feature point vertically downward, use the first feature point as the pressure contact point, slowly and uniformly press the racket frame until it breaks, and acquire the top pressure test data. Place the racket frame in a posture with the line connecting the third feature point and the fourth feature point vertically downward, use the third feature point as the pressure contact point, slowly and uniformly side-press the racket frame until it breaks, and acquire the side pressure test data; A hitting test unit, which is configured to model the racket frame, acquire racket frame model information, acquire a shell element model according to the racket frame model information, input the hitting test parameter information as the load condition, and acquire the maximum stress information of the racket frame based on finite element analysis (FEA).

[0035] In summary, the advantages of the present invention are as follows: By using the basic strength test data and the material elastic modulus, the reference direction weight coefficient is acquired. Through the reference direction weight coefficient, the material stiffness of the racket frame in different directions is accurately analyzed, providing a basis for the subsequent selection of the hitting point, improving the racket frame strength test efficiency. By simulating the hitting scenario to divide the racket face area, combining the reference direction weight coefficient to determine the hitting test parameters, making the test closer to the actual use situation, and improving the effectiveness of the test. By using finite element analysis to acquire the maximum stress information of the racket frame and comparing it with the material strength threshold to determine whether it is qualified, providing a scientific and accurate basis for the racket frame strength evaluation, and ensuring the stability and reliability of the racket frame strength test.

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A racket frame strength test data analysis method based on data collaboration, characterized in that: include: Acquire racket frame material information, wherein the racket frame material information includes racket frame material type information and corresponding material performance parameter information; According to the racket frame material information, the material elastic modulus is obtained; Performing a basic strength test on the racket frame to obtain basic strength test data, wherein the basic strength test includes a top pressure test and a side pressure test; Obtain the reference direction weight coefficient according to the foundation strength test data and the material elastic modulus; Based on the simulation of the batting scene, the racket face area is divided to obtain the racket face area information; According to the reference direction weight coefficient and the racket face area information, the hitting test parameter information corresponding to each racket face area is obtained; Performing a hitting test on the racket according to the hitting test parameter information to obtain hitting test data; According to the ball hitting test data, it is determined whether the racket frame strength test is qualified. If not, the racket frame is adjusted. If yes, the racket frame strength is qualified.

2. The racket frame strength test data analysis method based on data collaboration according to claim 1, characterized in that: The basic strength test of the racket frame is performed to obtain basic strength test data, specifically including: Connect any two positions on the racket frame and measure the distance between the connecting segments; The two positions on the racket frame where the line segments have the largest distance are taken as the first feature point and the second feature point, wherein the first feature point indicates the position far from the racket throat of the two positions where the line segments have the largest distance, and the second feature point indicates the position close to the racket throat of the two positions where the line segments have the largest distance; The line segment connecting the first feature point and the second feature point is used as a reference line segment; The two positions of the connecting line segment which is perpendicular to the reference line segment and has the largest connecting line segment distance are taken as the third feature point and the fourth feature point, and the intersection point of the connecting line segment between the third feature point and the fourth feature point and the reference line segment is taken as the center of the racket frame; The racket frame is placed in a posture where the line connecting the first characteristic point and the second characteristic point is vertically downward, and the first characteristic point is used as a pressure contact point, and the racket frame is pressed slowly and uniformly until the racket breaks, and top pressure test data is obtained, wherein the top pressure test data includes a top pressure value and a top pressure deformation amount; The top pressure deformation amount represents the maximum change in the distance between the first characteristic point and the second characteristic point during the top pressure test; The racket frame is placed in a posture where the line connecting the third characteristic point and the fourth characteristic point is vertically downward, and the third characteristic point is used as a pressure contact point, and the racket frame is subjected to uniform and slow lateral pressure until the racket breaks, and lateral pressure test data is obtained, wherein the lateral pressure test data includes a lateral pressure value and a lateral pressure deformation amount; The foundation strength test data is obtained based on the top pressure test data and the side pressure test data.

3. The racket frame strength test data analysis method based on data collaboration according to claim 1, characterized in that: The method of obtaining the reference direction weight coefficient according to the basic strength test data and the material elastic modulus specifically includes: According to the foundation strength test data, obtain the top pressure value and the side pressure value; According to the elastic modulus of the material, the top pressure value and the side pressure value, the predicted change of the top pressure and the predicted change of the side pressure are obtained, wherein the predicted change of the top pressure is the ratio of the top pressure value to the elastic modulus of the material, and the predicted change of the side pressure is the ratio of the side pressure value to the elastic modulus of the material; The line from the second characteristic point to the first characteristic point is used as the first reference direction, and the difference between the predicted change of top pressure and the deformation of top pressure is used as the deformation difference in the first reference direction; The line from the fourth characteristic point to the third characteristic point is used as the second reference direction, and the difference between the estimated change in lateral pressure and the lateral pressure deformation is used as the deformation difference in the second reference direction; Obtaining a reference direction weight coefficient according to a ratio of a first reference direction deformation difference value to a second reference direction deformation difference value; Among them, the reference direction weight coefficient is specifically: ； In the formula, is the weight coefficient of the first reference direction, is the second reference direction weight coefficient, is the deformation difference in the first reference direction, is the deformation difference in the second reference direction.

4. The racket frame strength test data analysis method based on data collaboration according to claim 1, characterized in that: The method of dividing the racket surface area based on the batting scene simulation and obtaining the racket surface area information specifically includes: Based on the batting scene simulation, different batting techniques are used to hit the ball and obtain the position information of the hitting point on the racket face; According to the position information of the hitting point on the racket face, the position information of each hitting point on the racket face is matched with the corresponding hitting technical action information; Based on the technical action type, the batting technical action information is classified to obtain the batting technical action classification information, wherein the technical action type includes a smash action, a lob action, and a dive action; Based on the classification information of the hitting technical action, the position information of the hitting point on the racket face is classified to obtain the classification information of the hitting point on the racket face; According to the racket face hitting point classification information, any racket face hitting point in each type of racket face hitting point is used as the regional initial point of the racket face hitting point of this type; Expand the region with the initial point of the region until the region covers all the racket face hitting points of the racket face hitting point classification corresponding to the initial point of the region, and obtain racket face region information; The racket face area information includes the racket face area and the corresponding technical action type.

5. The racket frame strength test data analysis method based on data collaboration according to claim 1, characterized in that: The step of obtaining the ball hitting test parameter information corresponding to each racket face area according to the reference direction weight coefficient and the racket face area information specifically includes: Obtaining the center of the racket frame, the first reference direction, and the second reference direction; Establishing a plane rectangular coordinate system with the center of the racket frame as the origin and the first reference direction and the second reference direction as the coordinate axis directions; According to the racket face area information, the hitting point matching index is calculated for any position within the racket face area; The position with the largest hitting point matching index is taken as the hitting point of the racket in the racket face area; Based on the technical action type, conventional hitting data corresponding to each technical action type is obtained, wherein the conventional hitting data includes a change in ball speed, a mass of the ball, a contact time between the ball and the racket surface, and an angle between the movement direction of the ball and the racket surface; According to conventional hitting data, the hitting force information corresponding to each technical action type is obtained, wherein the hitting force information includes the magnitude and direction of the hitting force; The hitting force information corresponding to each technical action type is used as the hitting test force information of the racket face area corresponding to the technical action type; Obtaining the batting test parameter information according to the batting point of the racket and the batting test force information; The calculation formula of the hitting point matching index is: ； In the formula, is the hitting point matching index, is the weight coefficient of the first reference direction, is the second reference direction weight coefficient, are the coordinates of the hitting point.

6. The racket frame strength test data analysis method based on data collaboration according to claim 1, characterized in that: The step of judging whether the racket frame strength test is qualified according to the ball hitting test data specifically includes: Modeling the racket frame and obtaining racket frame model information; According to the racket frame model information, a shell unit model is obtained; Acquire racket frame string material information, wherein the racket frame string material information includes a longitudinal elastic modulus of the string material, a transverse modulus of the string material, and a shear modulus of the string material; According to the racket frame string material information, the batting test parameter information is input as the load condition, and the racket frame maximum stress information is obtained based on finite element analysis (FEA); According to the racket frame material information, a material strength threshold is obtained; Based on the maximum stress information of the racket frame and the material strength threshold, determine whether the racket frame strength test is qualified. If the maximum stress of the racket frame does not exceed the material strength threshold, the racket frame strength is qualified. If the maximum stress of the racket frame exceeds the material strength threshold, the racket frame strength is unqualified and the racket design is adjusted.

7. A racket frame strength test data analysis system based on data collaboration, used to implement the analysis method according to any one of claims 1 to 6, characterized in that: include: A main control module, wherein the main control module is used to obtain an estimated change in top pressure and an estimated change in side pressure according to the elastic modulus of the material, the top pressure value and the side pressure value, take a line from the second feature point to the first feature point as a first reference direction, take a difference between the estimated change in top pressure and the top pressure deformation as a first reference direction deformation difference, take a line from the fourth feature point to the third feature point as a second reference direction, take a difference between the estimated change in side pressure and the side pressure deformation as a second reference direction deformation difference, obtain a reference direction weight coefficient according to a ratio of the first reference direction deformation difference to the second reference direction deformation difference, divide the racket face area based on a batting scene simulation, obtain racket face area information, obtain batting test parameter information corresponding to each racket face area according to the reference direction weight coefficient and the racket face area information, and judge whether the racket frame strength test is qualified according to the batting test data; An information acquisition module, the information acquisition module is used to obtain racket frame material information, racket frame material type information and corresponding material performance parameter information, obtain material elastic modulus according to the racket frame material information, connect any two positions on the racket frame, measure the distance of the connecting line segment, and obtain racket frame wire material information, wire material longitudinal elastic modulus, wire material transverse modulus and wire material shear modulus; A strength testing module, the strength testing module is used to place the racket frame in a vertically downward posture with a line connecting a first characteristic point and a second characteristic point, use the first characteristic point as a pressure contact point, and uniformly and slowly press the racket frame upward until the racket breaks, and obtain top pressure test data; place the racket frame in a vertically downward posture with a line connecting a third characteristic point and a fourth characteristic point, use the third characteristic point as a pressure contact point, and uniformly and slowly press the racket frame laterally until the racket breaks, and obtain side pressure test data; model the racket frame, obtain racket frame model information, obtain a shell unit model based on the racket frame model information, use hitting test parameter information as a load condition for input, and obtain maximum stress information of the racket frame based on finite element analysis (FEA); A display module interacts with the main control module and is used to output and display basic strength test data, reference direction weight coefficient, racket face area information, hitting test parameter information and hitting test data.

8. The racket frame strength test data analysis system based on data collaboration according to claim 7, characterized in that: The main control module specifically includes: A control unit, the control unit is used to divide the racket face area based on the batting scene simulation, obtain racket face area information, obtain batting test parameter information corresponding to each racket face area according to the reference direction weight coefficient and the racket face area information, and determine whether the racket frame strength test is qualified according to the batting test data; An information receiving unit, which interacts with the information acquisition module and the strength testing module to receive data and transmit it to the evaluation unit; An evaluation unit is used to obtain an estimated change in top pressure and an estimated change in lateral pressure according to the elastic modulus of the material, the top pressure value and the lateral pressure value, take a line from the second feature point to the first feature point as a first reference direction, take a difference between the estimated change in top pressure and the top pressure deformation as a first reference direction deformation difference, take a line from the fourth feature point to the third feature point as a second reference direction, take a difference between the estimated change in lateral pressure and the lateral pressure deformation as a second reference direction deformation difference, and obtain a reference direction weight coefficient according to a ratio of the first reference direction deformation difference to the second reference direction deformation difference.

9. The racket frame strength test data analysis system based on data collaboration according to claim 7, characterized in that: The information acquisition module specifically includes: a first acquisition unit, the first acquisition unit being used to acquire racket frame material information, racket frame material type information and corresponding material performance parameter information, acquire material elastic modulus according to the racket frame material information, connect any two positions on the racket frame, and measure the distance of the connecting line segment; The second acquisition unit is used to acquire the racket frame string material information, the string material longitudinal elastic modulus, the string material transverse modulus and the string material shear modulus.

10. The racket frame strength test data analysis system based on data collaboration according to claim 7, characterized in that: The strength test module specifically includes: A basic strength testing unit, the basic strength testing unit is used to place the racket frame in a vertically downward posture with a line connecting the first characteristic point and the second characteristic point, use the first characteristic point as a pressure contact point, and uniformly and slowly press the racket frame upward until the racket breaks, and obtain top pressure test data; place the racket frame in a vertically downward posture with a line connecting the third characteristic point and the fourth characteristic point, use the third characteristic point as a pressure contact point, and uniformly and slowly press the racket frame sideways until the racket breaks, and obtain side pressure test data; The hitting test unit is used to model the racket frame, obtain the racket frame model information, obtain the shell unit model according to the racket frame model information, input the hitting test parameter information as the load condition, and obtain the maximum stress information of the racket frame based on finite element analysis (FEA).

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