Racket ball hitting position determination method and smart pickleball racket system

Abstract

The application belongs to the technical field of intelligent sports equipment, and particularly relates to a racket ball hitting position determination method and an intelligent piquet racket system. When a ball hitting point is located at a position other than the center of a sweet area on a racket body, a difference between each detection time of a standard value and a detection time of a reference value is a standard time difference. A coordinate of an actual ball hitting point is calculated through a difference between each standard time difference and a reference time difference. An advantage of the application is that, since the reference time difference of the sweet area center is used as a comparison reference, a deviation introduced by individual response difference of a sensor and common interference of racket structure vibration can be inhibited, and consistency of position determination is good. Since the piezoelectric film sensor only needs to be arranged at limited points, the piezoelectric film sensor does not need to cover the entire racket surface, and thus has little influence on inherent elasticity of the racket surface and ball hitting feeling, and is conducive to controlling a device cost.

Description

Technical Field

[0001] This invention relates to the technical field of intelligent sports equipment, and particularly to a method for determining the position of a racket strike and an intelligent Peak racket system. Background Technology

[0002] In racket sports such as pickleball, the position of the hitting point relative to the sweet spot on the racket face directly affects the quality of the shot. Accurately determining the hitting point position is of practical significance for technical diagnosis and improvement.

[0003] Currently, common methods for detecting ball position mainly rely on high-speed camera analysis or the deployment of large-area piezoelectric sensor arrays on the racket face. High-speed camera systems are expensive, cumbersome to set up and calibrate, and their application is limited by venue and lighting conditions, making them unsuitable for widespread use in regular training. Furthermore, densely packed piezoelectric sensor arrays on the racket face increase the added mass of the racket head, altering the inherent elasticity and vibration characteristics of the racket face, affecting the user's feel for the ball. They are also relatively complex to manufacture and costly. Therefore, providing a ball position determination method that minimizes the impact on the original characteristics of the racket, has a simpler structure, and is cost-effective is a problem that needs to be solved in existing technologies. Summary of the Invention

[0004] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a racket hitting position determination method and a smart Peak racket system, which solves the technical problems of high cost and inconvenience of use in the existing hitting position determination methods.

[0005] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by the present invention include: Firstly, this invention provides a method for determining the position of a racket strike. The method involves detecting pressure transmitted from the strike point through the racket body at multiple points on the racket body. The time taken for pressure to be detected at one point is designated as a reference value, and the times taken for pressure to be detected at the other points are designated as standard values. When the strike point is located at the center of the sweet spot, the difference between the detection time of each standard value and the detection time of the reference value is defined as the reference time difference. When the strike point is located at a position on the racket body other than the center of the sweet spot, the difference between the detection time of each standard value and the detection time of the reference value is defined as the standard time difference. The coordinates of the actual strike point are calculated using the difference between each standard time difference and the reference time difference.

[0006] In one technical solution of the present invention, the reference time difference is calculated by measuring the propagation speed of the vibration wave on the racket body.

[0007] In one technical solution of the present invention, the coordinates of the actual hitting point are calculated by the difference between each standard time difference and a reference time difference. Specifically, this includes: multiplying the sum of the difference between each standard time difference and a reference time difference with the propagation speed of the vibration wave on the racket body to obtain the distance difference between each pressure detection point that detects the standard value and the pressure detection point that detects the reference value at the actual hitting point. The actual hitting point is then calculated using the distance difference.

[0008] In one technical solution of the present invention, the determination method further includes: outputting a qualified signal when the calculated coordinates of the actual hitting point conform to the preset sweet spot range; and outputting a failed signal when the calculated coordinates of the actual hitting point do not conform to the preset sweet spot range.

[0009] Secondly, this invention provides a smart Peak racket system, including a racket body, a sweet spot, piezoelectric membrane sensors, and a processing module. Multiple piezoelectric membrane sensors are disposed on the racket body and are suitable for detecting the pressure transmitted from the point of impact through the racket body. The time it takes for one piezoelectric membrane sensor to detect pressure at a given point is a reference value, while the time taken for the other piezoelectric membrane sensors to detect pressure at their respective points is a standard value. The processing module is electrically connected to both the piezoelectric membrane sensors and the piezoelectric membrane sensors.

[0010] When the hitting point is at the center of the sweet spot, the difference between each detection time of the remaining pressure sensors detecting the standard value and the detection time of a piezoelectric sensor detecting the reference value is called the reference time difference. When the hitting point is at a location on the racket body other than the center of the sweet spot, the difference between each detection time of the remaining pressure sensors detecting the standard value and the detection time of a piezoelectric sensor detecting the reference value is called the standard time difference. The processing module can calculate the coordinates of the actual hitting point using the difference between each standard time difference and the reference time difference.

[0011] In one embodiment of the present invention, the racket system further includes a feedback module electrically connected to the processing module, configured to output a pass signal when the calculated coordinates of the actual hitting point conform to a preset sweet spot range, and to output a fail signal when the calculated coordinates of the actual hitting point do not conform to the preset sweet spot range.

[0012] In one embodiment of the present invention, a handle extends from the racket body, and the feedback module includes a vibrating element disposed within the handle, which is suitable for outputting vibration prompts.

[0013] In one embodiment of the present invention, the feedback module includes a sound output component, which is adapted to output sound prompts.

[0014] In one technical solution of the present invention, four piezoelectric film sensors are provided and are respectively located at the four corners of the racket body, and the center of the sweet spot is located at the center of the cross line connecting the piezoelectric film sensors.

[0015] In one technical solution of the present invention, the intelligent Peak racket system further includes a power supply module. Both the processing module and the power supply module are located inside the handle. The power supply module is electrically connected to the processing module, the feedback module and the piezoelectric membrane sensor. It also includes contact components suitable for establishing electrical connections between the piezoelectric film sensor, the processing module, and the power supply module; The contact assembly includes a first contact ring and a second contact ring that are fixedly connected to the handle and the racket body, respectively. A connecting part is formed on the handle, and a mating part is formed on the racket body. The connecting part and the mating part can be detachably connected, and when the connecting part and the mating part are connected, the first contact ring and the second contact ring engage with each other.

[0016] (III) Beneficial Effects The beneficial effects of the present invention are: the racket hitting position determination method of the present invention, by comparing the actual measured standard time differences with the predetermined reference time differences, can extract the time offset caused by the change of the hitting point position.

[0017] This scheme uses the vibration propagation time difference as the carrier of position information, making it insensitive to changes in hitting force and improving system adaptability. Because it uses the reference time difference at the center of the sweet spot as the comparison benchmark, it can suppress deviations introduced by individual sensor response differences and common interference from racket structure vibrations, resulting in good consistency in position determination. The computational load for coordinate calculation is also low, facilitating real-time execution on the racket's built-in low-power processing module. Since the piezoelectric film sensors only need to be placed at a limited number of points, without covering the entire racket face, it has minimal impact on the inherent elasticity of the racket face and the feel of the shot, and also reduces the cost of control components.

[0018] Because this technical solution calculates the coordinates of the actual hitting point by using the difference between each standard time difference and the reference time difference, each time the coordinates are calculated, the time difference measured by the position of one pressure sensor and the position of another pressure sensor is combined, while ignoring the initial hitting time. Therefore, the hitting point can be obtained without referring to the initial hitting time, while ensuring good calculation accuracy.

[0019] Furthermore, since this application obtains the actual hitting point based on the time difference between the actual hitting point and the hitting point at the center of the sweet spot, the calculation of the hitting point not only utilizes theoretical calculations but also reflects the actual transmission of vibration waves on the Peak racket through the time difference comparison calculation method, making the calculation results closer to the actual hitting point and thus improving the accuracy of obtaining the actual hitting point. Attached Figure Description

[0020] Figure 1 This is one of the flowcharts for the racket hitting position determination method of the present invention; Figure 2 This is the second flowchart of the racket hitting position determination method of the present invention; Figure 3 This is the third flowchart of the racket hitting position determination method of the present invention; Figure 4 This is a system block diagram of the intelligent Peak racket system of the present invention; Figure 5 This is a schematic diagram of the structure of the Peak racket of the present invention; Figure 6 This is one of the structural schematic diagrams of the racket body of the present invention; Figure 7 This is a second schematic diagram of the structure of the racket body of the present invention; Figure 8 This is a side view of the Peak racket of the present invention. Figure 9 For the present invention Figure 8 A magnified schematic diagram of the structure at point A in the middle.

[0021] Explanation of reference numerals in the attached figures 1: Racket body; 1a: Sweet spot; 1b: Connecting parts; 2: Piezoelectric film sensor; 3: Processing module; 4: Feedback module; 41: Vibration component; 42: Sound output component; 5: Handle; 5a: Connecting part; 6: Power supply module; 7: Contact assembly; 71: First contact ring; 72: Second contact ring. Detailed Implementation

[0022] To better explain and facilitate understanding of this invention, the following description is provided in conjunction with the appendix. Figures 1-9 The present invention will be described in detail through specific embodiments. In this document, directional terms such as "upper" and "lower" are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0023] Example 1: Reference Figures 1-9 The present invention provides a method for determining the position of a racket strike, which can be used in a smart Peak racket system to calculate the coordinates of the actual striking point.

[0024] The pressure transmitted from the point of impact through the racket body 1 is detected at multiple points on the racket body 1. The time when pressure is detected at one point is a reference value, and the time when pressure is detected at the other points is a standard value. When the point of impact is located at the center of the sweet spot 1a, the standard value is detected at each detection time t. 0i i=2, 3, 4..., and the detection time t when the reference value is detected. 01 The difference is the reference time difference Δt 0i i = 2, 3, 4...; When the point of impact is located on the racket body 1 at a position other than the center of the sweet spot 1a, each detection time t of the standard value is detected. i For i=2, 3, 4..., the difference between the detection time t1 and the time at which the reference value was detected is the standard time difference Δt. i i = 2, 3, 4...; The coordinates (x, y) of the actual hitting point are calculated by the difference between each standard time difference and the reference time difference.

[0025] The reference time difference is calculated by measuring the propagation speed of the vibration wave on the racket body 1.

[0026] The coordinates of the actual hitting point are calculated by using the difference between each standard time difference and the reference time difference, specifically including: By multiplying the difference between each standard time difference and the reference time difference with the sum of each corresponding reference time difference and the propagation speed of the vibration wave on the racket body 1, the distance difference between each pressure detection point that detects the standard value and the pressure detection point that detects the reference value at the actual hitting point is obtained. The actual hitting point is calculated based on the distance difference.

[0027] This method is applied to a smart Peak racket system, which includes a racket body 1, a piezoelectric membrane sensor 2, and a processing module 3.

[0028] The racket body 1 has a sweet spot 1a; Multiple piezoelectric film sensors 2 are installed on the racket body 1 to detect the pressure transmitted from the point of impact through the racket body 1. The time when the pressure is detected at the point detected by one piezoelectric film sensor 2 is a reference value, and the time when the pressure is detected at the points detected by the other piezoelectric film sensors 2 is a standard value. Processing module 3 and piezoelectric membrane sensor 2 are both electrically connected; When the hitting point is located at the center of the sweet spot 1a, the difference between the detection time of the remaining pressure at each detection time of the standard value and the detection time of the reference value detected by a piezoelectric membrane sensor 2 is the reference time difference. When the hitting point is located on the racket body 1 at a position other than the center of the sweet spot 1a, the difference between the detection time of the other pressure sensors detecting the standard value and the detection time of a piezoelectric membrane sensor 2 detecting the reference value is the standard time difference. Processing module 3 can calculate the coordinates of the actual hitting point by using the difference between each standard time difference and the reference time difference.

[0029] In this embodiment, in racket sports such as pickleball, the position of the hitting point relative to the sweet spot of the racket face directly affects the quality of the shot. Existing measurement solutions mostly rely on high-speed cameras or large-area pressure arrays on the racket face, which are costly or alter the feel of the racket face. To obtain the hitting position with lower structural complexity while maintaining the original characteristics of the racket body, this solution uses discretely arranged piezoelectric film sensors 2 and the time difference of arrival of vibration waves to achieve coordinate determination.

[0030] Multiple piezoelectric membrane sensors 2 are distributed on the racket body 1 to sense the vibration waves generated by the ball's impact. The time when one of the piezoelectric membrane sensors 2 detects pressure at its detection point is used as a reference value, and the time when the other piezoelectric membrane sensors 2 detect pressure at their detection points is used as a standard value. Using the predetermined center of the sweet spot 1a as a reference position, when the sweet spot center is hit, the vibration wave propagates from that center to each sensor. The difference in the time when each sensor generating a standard value senses the pressure signal compared to the sensor generating a reference value can be measured, and this difference is recorded as the reference time difference for the corresponding standard sensor. The reference time difference can also be calculated based on the path length from the sweet spot center to each piezoelectric membrane sensor 2 and the propagation speed of the vibration wave in the racket material, thereby simplifying the calibration process.

[0031] During actual shot hitting, the point of impact often deviates from the center of the sweet spot. At this time, the processing module 3 receives signals from each piezoelectric sensor 2 and calculates the time difference between the pressure signal detected by each standard sensor and the reference sensor, obtaining the corresponding standard time difference. Because the measured standard time differences are compared with predetermined reference time differences, the time offset caused by the change in the shot point position can be extracted. Adding the time offset of a standard sensor to its corresponding reference time difference, and multiplying the sum by the propagation speed of the vibration wave on the racket body 1, yields the difference between the distance from the current shot point to the standard sensor and the distance to the reference sensor—the distance difference. Since the positions of each piezoelectric sensor 2 in the racket coordinate system are known, the coordinates of the actual shot point can be calculated using geometric relationships based on the distance differences obtained from multiple standard sensors.

[0032] This determination method is applied to the intelligent Peak racket system. The system includes a racket body 1 with a sweet spot 1a, multiple piezoelectric membrane sensors 2 fixed to the racket body 1, and a processing module 3 electrically connected to each piezoelectric membrane sensor 2. The processing module 3 determines the hitting position based on the aforementioned logic of calculating distance differences through time differences to determine coordinates.

[0033] This scheme uses the vibration propagation time difference as the carrier of position information, making it insensitive to changes in hitting force and improving system adaptability. Since the reference time difference at the center of the sweet spot is used as the comparison benchmark, it can suppress deviations introduced by individual sensor response differences and common interference from racket structure vibration, resulting in good consistency in position determination. The computational load for coordinate calculation is also low, facilitating real-time execution on the racket's built-in low-power processing module 3. Because the piezoelectric film sensor 2 only needs to be placed at a limited number of points, without covering the entire racket face, it has minimal impact on the inherent elasticity of the racket face and the hitting feel, and also reduces the cost of control components.

[0034] Specifically, four piezoelectric film sensors 2 are provided, and they are located at the four corners of the racket body 1 respectively.

[0035] The surface of the racket body 1 at the point of impact can be made of carbon fiber, which covers both sides of the base material of the racket body. A piezoelectric membrane sensor 2 is fixedly connected to the base material and adheres to the carbon fiber to detect pressure. Since the impact pressure is much greater than the air resistance during the swing, the pressure change caused by air resistance can be ignored.

[0036] It is important to note that due to the small size of the racket, the piezoelectric sensor 2 needs to have high time accuracy, ideally reaching the level of 0.1 microseconds, which is equivalent to the level of advanced acoustic emission detection instruments and is also the ideal goal for the commercial use of smart rackets. For example, a sensor with a circular piezoelectric film can be used, which is fixed on the substrate described below and covered with a carbon fiber panel.

[0037] The wiring harness of the electro-film sensor can be extended into the handle 5 through the substrate to complete the wiring harness arrangement.

[0038] More specifically, the actual calculation method is as follows: Let the center coordinates of the sweet spot be (0, 0), the actual hitting point be (x, y), and set four piezoelectric film sensors 2, namely S1-S4, with the following positions: S1: 12 o'clock position (top of the racket head) (0, y1) such as (0, 320).

[0039] S2: 3 o'clock position (right side of the racket frame) (x2, 0) such as (160, 0).

[0040] S3: 6 o'clock position (throat connection) (0, y3) such as (0, -280).

[0041] S4: 9 o'clock position (left side of the racket frame) (x4, 0) such as (-160, 0).

[0042] If the racket body 1 is made of carbon fiber, the propagation speed v in cross-laid carbon fiber composite materials is typically 2000-2500 m / s; here we take it as 2250 m / s, which is 2.25 × 10⁻⁶ m / s. 6 mm / s.

[0043] When the ball is struck in the center of the sweet spot, the time difference between each sensor and S1, i.e., the reference value, is as follows:

[0044] These are known constants, which can be calculated and stored after the sensor is installed.

[0045] The time difference between each sensor and S1 during the actual shot, i.e., the measured value, and the difference between the measured value and the reference value, are as follows:

[0046] This difference reflects the change in propagation distance caused by the movement of the striking point, resulting in a change in propagation time.

[0047] because , and .

[0048] therefore .

[0049] Multiply both sides by v: .

[0050] Similarly, .

[0051] definition:

[0052]

[0053]

[0054] Since △ti can be obtained by measurement, ki can be calculated in mm.

[0055] Further:

[0056] Actual distance formula:

[0057] Will Substitution .

[0058] First, let's unfold... :

[0059] because Subtract d1² from both sides:

[0060]

[0061]

[0062] Then unfold :

[0063] minus :

[0064] The right side of the equation:

[0065] and then,

[0066] Expand :

[0067]

[0068] The right side of the equation:

[0069] and then, .

[0070] Solve for y:

[0071]

[0072]

[0073]

[0074]

[0075]

[0076]

[0077]

[0078]

[0079] Solve for d1: After finding y, calculate directly:

[0080] Solve for x:

[0081]

[0082] .

[0083] Example 1: The specific reference values ​​are as follows, based on calculations:

[0084] When the measured values ​​are as follows:

[0085] but:

[0086]

[0087] Then x = 100, y = -120.

[0088] Example 2: When the measured values ​​are as follows:

[0089] but

[0090]

[0091]

[0092]

[0093] Then x=100, y=200.

[0094] In summary, the calculation method for coordinates (x, y) is as follows:

[0095]

[0096]

[0097] If we calculate the vibration wave propagation velocity v using S1(0, y1), S2(x2, 0), S3(0, y3), S4(x4, 0), then y1>0, x2>0, y3<0, and x4<0.

[0098] Distance from each sensor to the center of the sweet spot:

[0099]

[0100] During the actual shot, the time difference relative to S1 is calculated as: t 21 , t 31 , t 41 Calculate the change in time difference (caused by the movement of the point of impact):

[0101]

[0102]

[0103] Following the same steps as above, we can conclude that:

[0104]

[0105] The processing module needs to store the final calculation methods for the coordinates x and y, as well as the specific calculation method for ki, and pre-store v and t. 0i1 The actual hitting coordinates can be calculated.

[0106] Example 2: Reference Figures 1-9 In addition to possessing all the technical solutions of the above embodiments, the embodiments of the present invention further possess the following technical solutions: Methods for determining the racket's hitting position also include: When the calculated coordinates of the actual hitting point match the preset sweet spot 1a range, a pass signal is output. If the calculated coordinates of the actual hitting point do not conform to the preset sweet spot 1a range, an unqualified signal is output.

[0107] The signal can be output through the feedback module 4, which can be configured as a vibrating element 41 and / or a sound output element 42. The vibrating element 41 can be configured on the racket body 1 with the handle 5 extending out.

[0108] The vibration alert corresponds to either a pass / fail signal or a fail / fail signal. For example, a vibration alert is output when the ball position is acceptable, and no vibration alert is output when the position is unacceptable. Alternatively, different vibration modes can be used; for example, one vibration alert is output when the ball position is acceptable, and another vibration alert is output when the position is unacceptable.

[0109] The handle 5 contains a processing module 3 and a power supply module, which is used to supply power to various electrical components.

[0110] When the feedback module 4 is a sound output device 42, the sound output device 42 can be an earphone. The player wears the earphone and outputs a "qualified" sound signal when the hitting position is qualified and an "unqualified" sound signal when the hitting position is unqualified.

[0111] In this embodiment, the vibrating element 41 and the sound output element 42 can work together or exist as optional components, allowing for switching between different usage scenarios. Since both the power supply module and the processing module 3 are built into the handle 5, to accommodate external sound output elements 42 such as headphones, the processing module 3 can integrate a short-range communication unit. The power supply module within the handle 5 can also provide power to the communication unit, thus maintaining a high degree of integration for the overall system and not increasing the burden on external wiring. This technical solution allows the player to more intuitively understand the actual hitting results, thereby improving training effectiveness.

[0112] The Peak racket also includes a power supply module 6. Both the processing module 3 and the power supply module 6 are located inside the handle 5. The power supply module 6 is electrically connected to the processing module 3, the feedback module 4 and the piezoelectric membrane sensor 2. It also includes a contact assembly 7, which is adapted to establish an electrical connection between the piezoelectric film sensor 2, the processing module 3, and the power supply module 6; The contact assembly 7 includes a first contact ring 71 and a second contact ring 72, which are respectively fixedly connected to the handle 5 and the racket body 1. A connecting portion 5a is formed on the handle, and a mating portion 1b is formed on the racket body. The connecting portion 5a and the mating portion 1b can be detachably connected, and when the connecting portion 5a and the mating portion 1b are connected, the first contact ring 71 and the second contact ring 72 engage with each other. Specifically, the connecting portion 5a and the mating portion 1b can be connected by a threaded connection. Both the first contact ring 71 and the second contact ring 72 are conical rings. After the threaded connection is established, the two naturally abut against each other, forming a reliable electrical connection. By setting mutually engaging contacts at specific positions on the conical rings, an electrical connection can be established between the piezoelectric membrane sensor 2, the power supply module 6, and the processing module 3.

[0113] The racket body 1 is a hollow structure with internal wiring harnesses for electrical connection to the piezoelectric membrane sensor 2.

[0114] Since the processing module 3, power supply module 6, and feedback module 4 are all located inside the handle, and the handle is the part that the player holds, the overall weight of the Peak racket is concentrated on the handle. This makes it easier for the player to swing the racket compared to a setup where all modules are located on the racket body 1. It also makes it easier to replace and maintain the feedback module 4, processing module 3, and power supply module 6.

[0115] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0116] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0117] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0118] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0119] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for determining the position of a racket strike, characterized in that: The pressure transmitted from the hitting point through the racket body (1) is detected by multiple points on the racket body (1). The time when pressure is detected at one point is the reference value, and the time when pressure is detected at the other points is the standard value. When the hitting point is located at the center of the hitting sweet spot (1a), the difference between the detection time of the standard value and the detection time of the reference value is the reference time difference. When the hitting point is located on the racket body (1) at a position other than the center of the hitting sweet spot (1a), the difference between the detection time of the standard value and the detection time of the reference value is the standard time difference. The coordinates of the actual hitting point are calculated by the difference between each standard time difference and the reference time difference.

2. The racket hitting position determination method as described in claim 1, characterized in that: The reference time difference is calculated by measuring the propagation speed of the vibration wave on the racket body (1).

3. The racket hitting position determination method as described in claim 2, characterized in that: The coordinates of the actual hitting point are calculated by using the difference between each standard time difference and the reference time difference, specifically including: By multiplying the difference between each standard time difference and the reference time difference with the sum of each corresponding reference time difference and the propagation speed of the vibration wave on the racket body (1), the distance difference between each pressure detection point that detects the standard value and the pressure detection point that detects the reference value at the actual hitting point is obtained. The actual hitting point is calculated based on the distance difference.

4. The method for determining the racket's striking position as described in claim 1, characterized in that: Also includes: When the calculated coordinates of the actual hitting point are within the preset sweet spot (1a) range, a pass signal is output; When the calculated coordinates of the actual hitting point do not conform to the preset sweet spot (1a) range, an unqualified signal is output.

5. A smart Peak racket system, characterized in that, include: The racket body (1) has a sweet spot (1a); The piezoelectric membrane sensor (2) consists of multiple sensors installed on the racket body (1) to detect the pressure transmitted from the hitting point through the racket body (1). The time when the pressure is detected at the point detected by one piezoelectric membrane sensor (2) is a reference value, and the time when the pressure is detected at the points detected by the other piezoelectric membrane sensors (2) is a standard value. The processing module (3) is electrically connected to the piezoelectric membrane sensor (2); When the hitting point is located at the center of the hitting sweet spot (1a), the difference between the detection time of the remaining pressure at each detection time of the standard value and the detection time of the reference value detected by a piezoelectric membrane sensor (2) is the reference time difference; When the hitting point is located on the racket body (1) at a position other than the center of the hitting sweet spot (1a), the difference between the detection time of the other pressure sensors detecting the standard value and the detection time of a piezoelectric membrane sensor (2) detecting the reference value is the standard time difference. The processing module (3) can calculate the coordinates of the actual hitting point by the difference between each standard time difference and the reference time difference.

6. The intelligent Peak racket system as described in claim 5, characterized in that, Also includes: The feedback module (4), electrically connected to the processing module, is configured as follows: When the calculated coordinates of the actual hitting point are within the preset sweet spot (1a) range, a pass signal is output; When the calculated coordinates of the actual hitting point do not conform to the preset sweet spot (1a) range, an unqualified signal is output.

7. The intelligent Peak racket system as described in claim 6, characterized in that, A handle (5) extends from the racket body (1), and the feedback module (4) includes a vibrating element (41) located in the handle (5) for outputting vibration prompts.

8. The intelligent Peak racket system as described in claim 6, characterized in that, The feedback module (4) includes a sound output component (42) suitable for outputting sound prompts.

9. The intelligent Peak racket system as described in any one of claims 5-8, characterized in that, Four piezoelectric membrane sensors (2) are set up and located at the four corners of the racket body (1), and the center of the sweet spot (1a) is located at the center of the cross line of the piezoelectric membrane sensors (2).

10. The intelligent Peak racket system as described in claim 6, characterized in that, It also includes a power supply module (6), and the processing module (3) and the power supply module (6) are both located inside the handle. The power supply module (6) is electrically connected to the processing module (3), the feedback module and the piezoelectric membrane sensor. It also includes a contact assembly (7) adapted to establish an electrical connection between the piezoelectric film sensor and the processing module (3) and the power supply module (6); The contact assembly (7) includes a first contact ring (71) and a second contact ring (72) that are fixedly connected to the handle and the racket body respectively. A connecting part (5a) is formed on the handle and a mating part (1b) is formed on the racket body. The connecting part (5a) and the mating part (1b) can be detachably connected, and when the connecting part (5a) and the mating part (1b) are connected, the first contact ring (71) and the second contact ring (72) engage with each other.

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