CN113750485A - Table tennis bat with piezoelectric sensor array and preparation method thereof - Google Patents
Table tennis bat with piezoelectric sensor array and preparation method thereof Download PDFInfo
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- CN113750485A CN113750485A CN202111117539.1A CN202111117539A CN113750485A CN 113750485 A CN113750485 A CN 113750485A CN 202111117539 A CN202111117539 A CN 202111117539A CN 113750485 A CN113750485 A CN 113750485A
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- piezoelectric sensor
- table tennis
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- tennis bat
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B59/00—Bats, rackets, or the like, not covered by groups A63B49/00 - A63B57/00
- A63B59/40—Rackets or the like with flat striking surfaces for hitting a ball in the air, e.g. for table tennis
- A63B59/42—Rackets or the like with flat striking surfaces for hitting a ball in the air, e.g. for table tennis with solid surfaces
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/46—Measurement devices associated with golf clubs, bats, rackets or the like for measuring physical parameters relating to sporting activity, e.g. baseball bats with impact indicators or bracelets for measuring the golf swing
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2102/00—Application of clubs, bats, rackets or the like to the sporting activity ; particular sports involving the use of balls and clubs, bats, rackets, or the like
- A63B2102/16—Table tennis
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2220/00—Measuring of physical parameters relating to sporting activity
- A63B2220/50—Force related parameters
- A63B2220/51—Force
- A63B2220/53—Force of an impact, e.g. blow or punch
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- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B2220/00—Measuring of physical parameters relating to sporting activity
- A63B2220/80—Special sensors, transducers or devices therefor
- A63B2220/83—Special sensors, transducers or devices therefor characterised by the position of the sensor
- A63B2220/833—Sensors arranged on the exercise apparatus or sports implement
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention belongs to the technical field of table tennis bats and discloses a table tennis bat with a piezoelectric sensor array.A piezoelectric sensing module is embedded in the bat surface of the table tennis bat, a signal processing module and a wireless transmitting module are embedded in a handle of the table tennis bat, the piezoelectric sensing module, the signal processing module and the wireless transmitting module are sequentially connected, and the piezoelectric sensing module is formed by a plurality of piezoelectric sensor unit arrays; the signal processing module is connected with each piezoelectric sensor unit and used for acquiring voltage analog signals output by the piezoelectric sensor units and converting the voltage analog signals into digital signals; the piezoelectric sensing module comprises a central piezoelectric sensor unit and X piezoelectric sensor units which are arranged on the periphery of the central piezoelectric sensor unit in a layered mode. The accurate drop point position of the table tennis on the racket can be comprehensively obtained, and weak links of the player in the training process can be more prominent, so that a corresponding training guidance scheme is formulated according to the obtained data, and the technical level of the player is effectively improved.
Description
Technical Field
The invention belongs to the technical field of table tennis bats, and particularly relates to a table tennis bat with a piezoelectric sensor array and a preparation method thereof.
Background
The intelligent sensor is used as an important component of artificial intelligence, and through recording and analyzing the motion data, the motion training is more scientific and efficient, and plays an increasingly important role in modern sports. Particularly, in the sports of table tennis and other bats, accurate hitting position and contact force on the bat are the most important indexes for evaluating hitting quality and further making personal training plans. The expensive equipment and extensive data processing make real-time monitoring difficult to achieve, especially for high frequency interactions between the ball and the racquet. Therefore, it is necessary and urgent to achieve accurate and rapid contact information measurement.
However, the existing training technical guidance completely depends on the observation and experience of coaches and athletes, scientific technology and instruments do not provide objective fact data in real time to assist judgment, and a method for evaluating and improving the combat technology of table tennis athletes by accurate and reliable data does not exist, so that the training blindness of the athletes is high, and the training efficiency is low. At present, some documents have recorded that the physiological characteristics of a player during training can be detected, the times of swinging the table tennis of the player and the position of a drop point of a table tennis ball on the edge of a table tennis table can be counted, and the data are not enough to provide data guidance of a professional skill direction for the player, and also can not provide accurate data of the drop point position of the table tennis ball on the table tennis table, so that weak links in the training can not be analyzed through specific data, and the guidance of professional training for the player can not be performed with pertinence so as to improve the skill.
Disclosure of Invention
The invention aims to provide a table tennis bat with a piezoelectric sensor array and a preparation method thereof, and solves the problems that weak links in training cannot be analyzed through specific data, and professional training guidance cannot be conducted on athletes in a targeted manner so as to improve the technology.
The invention is realized by the following technical scheme:
a table tennis bat with a piezoelectric sensor array is characterized in that a piezoelectric sensing module is embedded in the bat surface of the table tennis bat, a signal processing module and a wireless transmitting module are embedded in a handle of the table tennis bat, the piezoelectric sensing module, the signal processing module and the wireless transmitting module are sequentially connected, the wireless transmitting module is connected with a remote end through a wireless receiving module, and the piezoelectric sensing module is formed by a plurality of piezoelectric sensor unit arrays;
the signal processing module is connected with each piezoelectric sensor unit and used for acquiring voltage analog signals output by the piezoelectric sensor units and converting the voltage analog signals into digital signals;
the wireless transmitting module is used for receiving the digital signal and sending the digital signal to the wireless receiving module;
the wireless receiving module is used for sending the received signals to a remote end, and the remote end is used for processing the digital signals and identifying the drop point position of the table tennis;
total number of piezoelectric sensor units of
The piezoelectric sensor unit comprises a central piezoelectric sensor unit and X piezoelectric sensor units which are arranged on the periphery of the central piezoelectric sensor unit in a layered mode, wherein the piezoelectric sensor units are distributed on N regular hexagons; wherein the content of the first and second substances,
n is the total number of layers, and the number of piezoelectric sensor units in the nth (N ═ 1, 2, … … N) layer is 6 × N;
and an encapsulation film is sealed on the upper surface of the piezoelectric sensing module.
Furthermore, the piezoelectric sensing module is bonded with the packaging film through epoxy resin AB glue.
Furthermore, the piezoelectric sensor units are connected through silver electrodes, and the silver electrodes are connected with the signal processing module through wires.
Further, the packaging film was a polyimide film having a thickness of 20 μm.
Further, the piezoelectric sensor units are uniformly distributed on the side lines of the regular hexagon.
Further, the piezoelectric sensor unit employs a P (VDF-TrFE) sensor.
Further, the borderlines of adjacent piezoelectric sensor units are 4mm apart.
Further, the piezoelectric sensor unit is in a regular hexagon, a circle or a square.
Furthermore, the signal processing module adopts an ESP32 single-chip microcomputer; the wireless transmitting module and the wireless receiving module adopt Bluetooth 4.0 modules.
The invention also discloses a preparation method of the table tennis bat, which comprises the following steps:
1) measuring the size of the table tennis bat, and cutting a P (VDF-TrFE) film into a size suitable for the table tennis bat;
2) designing a piezoelectric sensing module and making a layout graph of the piezoelectric sensing module;
3) selecting a printing plate required by screen printing according to the layout pattern, and selecting quick-drying conductive silver paste to perform screen printing on the surface of the P (VDF-TrFE) film to complete the preparation of the piezoelectric sensing module;
4) packaging the printed piezoelectric sensing module by using a packaging film;
5) each piezoelectric sensor unit is connected with the signal processing module, and the signal processing module and the wireless transmitting module are embedded into the table tennis handle to complete the preparation of the table tennis bat.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses a table tennis bat with a piezoelectric sensor array, wherein a piezoelectric sensor module is embedded in a bat surface and is formed by a plurality of piezoelectric sensor unit arrays, a signal processing module and a wireless transmitting module are integrated on the bat, the wireless transmitting module is connected with a remote end through a wireless receiving module, when a table tennis ball impacts on one piezoelectric sensor unit, the piezoelectric sensor unit collects an output voltage signal, an analog signal is converted into a digital signal through the signal processing module and is sent to the wireless receiving module through the wireless transmitting module, the wireless receiving module is connected with the remote end, and output data are obtained after processing, so that the table tennis ball drop point position is identified. The piezoelectric sensor module is formed by a plurality of piezoelectric sensor unit arrays, and the design has the advantages that the whole table tennis bat can be fully paved with the graphic units with single shapes and sizes, so that the position detection is more accurate, and the training plan of athletes and the technology are more favorably developed. Compared with the method that only the falling point position of the table tennis ball falling on the edge of the table tennis table in training can be judged, the table tennis bat with the piezoelectric sensor array can obtain accurate and reliable data to judge the falling point position of the table tennis ball on the bat, so that accurate data information is provided for athletes on the aspect of professional technology, and a targeted guidance scheme is provided to improve the technology; and compared with the method that only the physiological characteristics of the athletes during training can be detected and the times of swinging the rackets of the athletes can be counted, the table tennis racket with the piezoelectric sensor array can more comprehensively obtain the accurate drop point position of the table tennis on the racket, and can more highlight the weak links of the athletes during the training process, so that a corresponding training guidance scheme is formulated according to the obtained data, and the technical level of the athletes is effectively improved.
Furthermore, the piezoelectric material used for the piezoelectric sensor unit is P (VDF-TrFE), which has the advantages of higher sensitivity and capability of withstanding larger deformation amount compared with other piezoelectric materials.
The invention also discloses a preparation method of the table tennis bat, wherein the electrodes of the piezoelectric sensor unit are printed by screen printing, the array electrode pattern can be designed by self, and the obtained electrodes are thicker and have strong covering power; the regular hexagon sensor array conforming to the size of the table tennis bat is formed by single piezoelectric sensor units, is suitable for detecting the identification signal of the table tennis ball drop point position, and has short response time, higher sensitivity and good receiving performance.
Drawings
Fig. 1 is a schematic structural view of a piezoelectric sensor array of the present invention, in which a solid line is a positive electrode and a broken line is a negative electrode;
fig. 2 is an output voltage obtained by an experiment performed on the piezoelectric sensor unit of the present invention, and fig. 2(a) represents a voltage output when the piezoelectric sensor unit is subjected to a ping-pong impact force of 38N; FIG. 2(b) is a diagram showing the output voltage of the piezoelectric sensor unit when the impact force of the table tennis ball is 62N; FIG. 2(c) is a diagram showing the output voltage of the piezoelectric sensor unit when the impact force of the table tennis ball is 103N; FIG. 2(d) is a diagram showing the output voltage of the piezoelectric sensor unit when the impact force of the table tennis ball is 83N;
wherein 1 is a piezoelectric sensor unit, 2 is a positive electrode lead, and 3 is a negative electrode lead.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in figure 1, the invention discloses a table tennis bat with a piezoelectric sensor array, wherein a piezoelectric sensing module is embedded in the bat surface of the table tennis bat, a signal processing module and a wireless transmitting module are embedded in a handle of the table tennis bat, the piezoelectric sensing module, the signal processing module and the wireless transmitting module are sequentially connected, the wireless transmitting module is connected with a remote end through a wireless receiving module, and the piezoelectric sensing module is formed by a plurality of piezoelectric sensor units 1 in an array; the signal processing module is connected with each piezoelectric sensor unit 1 and used for acquiring voltage analog signals output by the piezoelectric sensor units 1 and converting the voltage analog signals into digital signals; the wireless transmitting module is used for receiving the digital signal and sending the digital signal to the wireless receiving module; the wireless receiving module is used for sending the received signals to a remote end, and the remote end is used for processing the digital signals and identifying the drop point position of the table tennis; and an encapsulation film is sealed on the upper surface of the piezoelectric sensing module.
As shown in fig. 1, the total number of piezoelectric sensor units 1 is
The piezoelectric sensor comprises a central piezoelectric sensor unit 1 and X piezoelectric sensor units 1 which are arranged on the periphery of the central piezoelectric sensor unit 1 in a layered mode, wherein the piezoelectric sensor units 1 are distributed on N regular hexagons; wherein the content of the first and second substances,
n is totalThe number of the piezoelectric sensor units 1 is 6 × N, which is the nth (N is 1, 2, … … N).
As shown in fig. 1, the piezoelectric sensor units 1 are connected by silver electrodes, the silver electrode led out from the left side is used as a positive electrode lead 2, the silver electrode led out from the right side is used as a negative electrode lead 3, and the positive electrode lead 2 and the negative electrode lead 3 are connected with a signal processing module by wires.
The piezoelectric sensor unit 1 is a P (VDF-TrFE) sensor made of a P (VDF-TrFE) thin film. When a table tennis ball falls on the sensor array, the surface of the piezoelectric sensor unit 1 is deformed by impact due to the piezoelectric effect of the P (VDF-TrFE) film. At this time, the piezoelectric sensor unit 1 in contact with the table tennis ball generates pressure changes, so that the piezoelectric sensor unit 1 converts different pressure changes into corresponding electric signals, and the electric signals are used for identifying the position of the falling point.
As shown in figure 1, the sensor array pattern designed according to the size of the table tennis bat comprises 19 piezoelectric sensor units 1, and the piezoelectric sensor units form a 5-column multi-row regular hexagon array structure in an adjacent 4mm mode. A layer of polyimide film is sealed on the outer layer of the regular hexagonal array structure, and signals are acquired through direct contact of the regular hexagonal array and the table tennis ball. The sensor array is encapsulated with a polyimide film to protect the array.
Of course, the piezoelectric sensor unit 1 is not limited to the regular hexagon, and a circle or a square is also possible.
The sensor array electrode is formed by screen printing, an aluminum alloy printing plate made of terylene is used, a small-sized horizontal lifting type screen printing machine is adopted, quick-drying conductive silver paste is used as the electrode, and the silver paste has the advantages of low resistance, good hardness, good adhesiveness and the like, so that the preparation of the sensor array electrode is completed, and a prepared sensor array sample is packaged.
Specifically, the signal processing module adopts an ESP32 single-chip microcomputer; the wireless transmitting module and the wireless receiving module adopt Bluetooth 4.0 modules.
Specifically, the piezoelectric sensing module is bonded to the packaging film through epoxy resin AB glue.
The output voltage signal generated when a ping-pong ball impacts on the piezoelectric sensor array unit is shown in fig. 2. When the table tennis ball impacts on the sensor film array, the output voltage signal is collected. The analog signals are converted into digital signals through the signal processing module, the digital signals are sent to the wireless receiving module through the wireless transmitting module, the wireless receiving module is connected with the remote end, and output data are obtained through processing of corresponding software of a computer, so that the position of the table tennis landing point is identified. Numbering each piezoelectric sensor unit 1, when the table tennis falls to one of them sensor unit, the effect of force can be received on film sensor unit surface, thereby because thereby the piezoelectric effect produces electric charge and converts into the signal of telecommunication, sends to computer processing module through wireless transmission module to show the serial number that receives the piezoelectric sensor unit 1 of power in the computer, thereby realize the discernment of placement position.
The invention discloses a preparation method of a table tennis bat, which comprises the following steps:
1) measuring the size of the table tennis bat, and cutting a P (VDF-TrFE) film into a size suitable for the table tennis bat;
2) designing a piezoelectric sensing module, and drawing a layout graph of the piezoelectric sensing module by using AI software;
3) selecting a printing plate required by screen printing according to the designed pattern, and selecting quick-drying conductive silver paste as an electrode for conducting;
4) using a small-sized horizontal lifting screen printing machine to perform screen printing, and preparing positive and negative electrodes on the surface of a P (VDF-TrFE) film to finish the preparation of the piezoelectric sensing module;
5) and packaging the printed piezoelectric sensing module by using a polyimide film with the thickness of 20 mu m, connecting silver electrodes led out by each piezoelectric sensor unit 1 with a signal processing module by using epoxy conductive adhesive through a wire, and embedding the signal processing module and a wireless transmitting module into a table tennis handle to finish the preparation of the table tennis bat.
Fig. 2(a) to 2(d) represent output voltages generated by the piezoelectric effect when the piezoelectric sensor unit 1 is impacted by a table tennis ball, and the abscissa represents time, i.e., scanning speed, and the ordinate represents the magnitude of the output voltages. In fig. 2(a), when the impact force of the table tennis ball on the piezoelectric sensor unit 1 is 38N, the output voltage is 2.3V; in fig. 2(b), the output voltage of the piezoelectric sensor unit 1 is 3.7V when the impact force of the table tennis ball is 62N; in fig. 2(c), the output voltage of the piezoelectric sensor unit 1 is 6.2V when the impact force of the table tennis ball is 103N; in fig. 2(d), the output voltage of the piezoelectric sensor unit 1 is 5V when the ping-pong ball impact force is 83N. The thin film sensor generates output voltage due to the piezoelectric effect, the peak value in the graph is the size of the output voltage, different impact forces generate different output voltages, and the larger the impact force is, the larger the output voltage is.
Claims (10)
1. A table tennis bat with a piezoelectric sensor array is characterized in that a piezoelectric sensing module is embedded in the bat surface of the table tennis bat, a signal processing module and a wireless transmitting module are embedded in a handle of the table tennis bat, the piezoelectric sensing module, the signal processing module and the wireless transmitting module are sequentially connected, the wireless transmitting module is connected with a remote end through a wireless receiving module, and the piezoelectric sensing module is formed by a plurality of piezoelectric sensor units (1) in an array;
the signal processing module is connected with each piezoelectric sensor unit (1) and is used for acquiring voltage analog signals output by the piezoelectric sensor units (1) and converting the voltage analog signals into digital signals;
the wireless transmitting module is used for receiving the digital signal and sending the digital signal to the wireless receiving module;
the wireless receiving module is used for sending the received signals to a remote end, and the remote end is used for processing the digital signals and identifying the drop point position of the table tennis;
the total number of the piezoelectric sensor units (1) is
The piezoelectric sensor comprises a central piezoelectric sensor unit (1) and X piezoelectric sensor units (1) which are arranged on the periphery of the central piezoelectric sensor unit (1) in a layered mode, wherein the piezoelectric sensor units (1) are distributed on N regular hexagons; wherein the content of the first and second substances,
n is the total number of layers, and the number of piezoelectric sensor units (1) in the nth (N ═ 1, 2, … … N) layer is 6 × N;
and an encapsulation film is sealed on the upper surface of the piezoelectric sensing module.
2. The table tennis bat with a piezoelectric sensor array of claim 1, wherein the piezoelectric sensing module is bonded to the packaging film by an epoxy AB glue.
3. Table tennis bat with a piezoelectric sensor array according to claim 1, wherein the piezoelectric sensor units (1) are connected with each other through silver electrodes, and the silver electrodes are connected with the signal processing module through wires.
4. The table tennis bat with the piezoelectric sensor array as claimed in claim 1, wherein the packaging film is a polyimide film, and the thickness of the polyimide film is 20 μm.
5. Table tennis bat with an array of piezoelectric sensors according to claim 1, wherein the piezoelectric sensor units (1) are uniformly arranged on the side lines of a regular hexagon.
6. Table tennis bat with an array of piezoelectric sensors according to claim 1, wherein the piezoelectric sensor unit (1) employs a P (VDF-TrFE) sensor.
7. Table tennis bat with an array of piezoelectric sensors according to claim 1, wherein the borderlines of adjacent piezoelectric sensor units (1) are 4mm apart.
8. Table tennis bat with an array of piezoelectric sensors according to claim 1, wherein the piezoelectric sensor units (1) are regular hexagons, circles or squares.
9. The table tennis bat with the piezoelectric sensor array according to claim 1, wherein the signal processing module adopts an ESP32 single chip microcomputer; the wireless transmitting module and the wireless receiving module adopt Bluetooth 4.0 modules.
10. A method of manufacturing a table tennis bat as claimed in any one of claims 1 to 9, comprising the steps of:
1) measuring the size of the table tennis bat, and cutting a P (VDF-TrFE) film into a size suitable for the table tennis bat;
2) designing a piezoelectric sensing module and making a layout graph of the piezoelectric sensing module;
3) selecting a printing plate required by screen printing according to the layout pattern, and selecting conductive silver paste to perform screen printing on the surface of the P (VDF-TrFE) film to complete the preparation of the piezoelectric sensing module;
4) packaging the printed piezoelectric sensing module by using a packaging film;
5) each piezoelectric sensor unit (1) is connected with a signal processing module, and the signal processing module and a wireless transmitting module are embedded into a table tennis handle to complete the preparation of the table tennis bat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111117539.1A CN113750485A (en) | 2021-09-23 | 2021-09-23 | Table tennis bat with piezoelectric sensor array and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111117539.1A CN113750485A (en) | 2021-09-23 | 2021-09-23 | Table tennis bat with piezoelectric sensor array and preparation method thereof |
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| Publication Number | Publication Date |
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| CN113750485A true CN113750485A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111117539.1A Pending CN113750485A (en) | 2021-09-23 | 2021-09-23 | Table tennis bat with piezoelectric sensor array and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010069160A (en) * | 2008-09-19 | 2010-04-02 | Sky Techno:Kk | Racket for sound table tennis |
| CN103157260A (en) * | 2013-04-08 | 2013-06-19 | 无锡市崇安区科技创业服务中心 | Table tennis racket with counting function |
| CN106621241A (en) * | 2016-10-18 | 2017-05-10 | 上海理工大学 | Table tennis ball pressure and placement analysis system |
-
2021
- 2021-09-23 CN CN202111117539.1A patent/CN113750485A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010069160A (en) * | 2008-09-19 | 2010-04-02 | Sky Techno:Kk | Racket for sound table tennis |
| CN103157260A (en) * | 2013-04-08 | 2013-06-19 | 无锡市崇安区科技创业服务中心 | Table tennis racket with counting function |
| CN106621241A (en) * | 2016-10-18 | 2017-05-10 | 上海理工大学 | Table tennis ball pressure and placement analysis system |
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Application publication date: 20211207 |