CN112999637B - Intelligent tennis training wall system - Google Patents

Intelligent tennis training wall system Download PDF

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CN112999637B
CN112999637B CN202110208098.XA CN202110208098A CN112999637B CN 112999637 B CN112999637 B CN 112999637B CN 202110208098 A CN202110208098 A CN 202110208098A CN 112999637 B CN112999637 B CN 112999637B
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tennis
control module
intelligent
pressure
wall system
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CN112999637A (en
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纪力
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China Three Gorges University CTGU
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China Three Gorges University CTGU
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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
    • A63B69/00—Training appliances or apparatus for special sports
    • A63B69/38—Training appliances or apparatus for special sports for tennis
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
    • A63B71/06—Indicating or scoring devices for games or players, or for other sports activities
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
    • A63B71/00—Games or sports accessories not covered in groups A63B1/00 - A63B69/00
    • A63B71/06—Indicating or scoring devices for games or players, or for other sports activities
    • A63B71/0619—Displays, user interfaces and indicating devices, specially adapted for sport equipment, e.g. display mounted on treadmills
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • 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
    • A63B2220/56—Pressure

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)
  • User Interface Of Digital Computer (AREA)

Abstract

The invention provides an intelligent tennis training wall system, which adopts electronic equipment as a wall body, and has the advantages of simple and movable structure and lower cost. Moreover, due to the fact that the pressure data acquisition module, the analog-to-digital conversion module and the control module are arranged inside the wall body, a trainer can automatically determine parameter information of the tennis ball and judge the landing point position of the tennis ball during wall hitting training, a coach does not need to carry out artificial fuzzy judgment, accuracy can be guaranteed, and labor cost is reduced.

Description

Intelligent tennis training wall system
Technical Field
The invention relates to the technical field of tennis facilities, in particular to an intelligent tennis training wall system.
Background
In recent years, the sports industry has seen an unprecedented growth as an important component of the modern service industry. Tennis sports events are widely popular and liked by the public and become popular exercise events in daily life. The demand for hardware facilities in tennis training is also increasing, for example: the efficiency and the enthusiasm of training are directly influenced by the selection and the construction of the training field, the skill level of a coach, the change of natural weather and the like. Therefore, the goal of strengthening the wall ball training is important, the practice method of hitting the wall can be accurately and comprehensively known, and the tennis can be rapidly learned in a short time without the guidance of any coach. To achieve this goal, a tennis training wall is needed to assist in practice, and the tennis skills of the trainers (i.e., players) are gradually improved.
The present tennis training wall has the following defects:
(1) the cement wall has a large structure, is not easy to move indoors and outdoors, and has high cost.
(2) The hitting information cannot be known in the wall hitting training, the position and data of a falling point cannot be judged, fuzzy judgment needs to be carried out by a coach, the accuracy cannot be guaranteed, and the labor cost is increased.
Disclosure of Invention
The invention provides an intelligent tennis training wall system which is used for overcoming the defects in the prior art.
The invention provides an intelligent tennis training wall system, which comprises: the pressure data acquisition module and the analog-to-digital conversion module are connected with the control module;
the pressure data acquisition module is used for acquiring tennis pressure signals at a tennis impact position on the surface of a wall body;
the analog-to-digital conversion module is used for converting the tennis pressure signal into a digital signal;
the control module is used for obtaining parameter information of the tennis ball impacting the surface of the wall body based on the tennis ball serving position, the tennis ball impacting position and the digital signal, wherein the parameter information comprises boundary information and impacting strength information of the tennis ball.
According to the intelligent tennis training wall system provided by the invention, the wall body comprises a transparent top plate, a display plate and a bottom plate which are vertically arranged;
the transparent top plate is fixedly connected with the bottom plate through a support column;
the display board is fixed between the transparent top board and the bottom board;
the pressure data acquisition module is arranged between the transparent top plate and the bottom plate;
the display board is connected with the control module and used for displaying the parameter information.
According to the intelligent tennis training wall system provided by the invention, the display board specifically comprises an LED display screen or an LCD display screen.
According to the intelligent tennis training wall system provided by the invention, the control module is specifically used for:
determining the out-of-bounds information based on the tennis serving location and the tennis impact location;
determining the impact strength information based on the digital signal.
The intelligent tennis training wall system further comprises a client terminal, wherein the client terminal is in communication connection with the control module;
and the client terminal is used for receiving the parameter information, performing statistical analysis on the parameter information, obtaining a statistical analysis result and displaying the statistical analysis result.
The intelligent tennis training wall system further comprises a sound production device, wherein the sound production device is connected with the control module;
when the pressure data acquisition module acquires the tennis pressure signal, the control module controls the sound production device to produce sound.
According to the intelligent tennis training wall system provided by the invention, the control module is further used for:
and determining serving recommendation information of the tennis ball based on the tennis serving position, the actual court length and the effective impact height of the wall surface.
According to the intelligent tennis training wall system provided by the invention, the pressure data acquisition module comprises a pressure sensor, and the pressure sensor is a resistance strain type pressure sensor or a piezoelectric sensor.
According to the intelligent tennis training wall system provided by the invention, the number of the pressure sensors is multiple.
According to the intelligent tennis training wall system provided by the invention, the pressure data acquisition module further comprises a filter and a signal amplifier;
the pressure sensor, the filter and the signal amplifier are sequentially connected, and the signal amplifier is connected with the analog-to-digital conversion module.
According to the intelligent tennis training wall system, the wall body is the electronic equipment, the structure is simple, the intelligent tennis training wall system is movable, and the cost is low. Moreover, due to the fact that the pressure data acquisition module, the analog-to-digital conversion module and the control module are arranged in the wall body, a trainer can automatically determine parameter information of tennis balls during wall hitting training, the position of a tennis ball falling point is judged, a coach does not need to carry out artificial fuzzy judgment, accuracy can be guaranteed, and labor cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an intelligent tennis training wall system provided by the present invention;
FIG. 2 is a schematic circuit diagram of HX711 provided by the present invention;
FIG. 3 is a schematic circuit diagram of the AT89C51 development board provided by the present invention;
FIG. 4 is a schematic circuit diagram of the pressure data acquisition module, HX711 and MCU connection provided by the present invention;
FIG. 5 is a schematic structural diagram of a wall body in the intelligent tennis training wall system provided by the invention;
FIG. 6 is a schematic circuit diagram of a resistive strain gauge pressure sensor provided by the present invention;
FIG. 7 is a schematic structural diagram of an intelligent tennis training wall system provided by the present invention;
fig. 8 is a schematic diagram of the movement locus of the tennis ball provided by the present invention when the tennis ball is in the uniform speed curve movement.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Because the existing tennis training wall is generally a cement wall, the tennis training wall has a large structure, is not easy to move indoors and outdoors, and has high cost. Moreover, the hitting information cannot be known in the wall hitting training, the position and data of the falling point cannot be judged, fuzzy judgment needs to be carried out by a coach, the accuracy cannot be guaranteed, and the labor cost is increased. Therefore, the embodiment of the invention provides an intelligent tennis training wall system to solve the technical problems in the prior art.
Fig. 1 is a schematic structural view of an intelligent tennis training wall system provided in an embodiment of the present invention, and as shown in fig. 1, the intelligent tennis training wall system includes: the pressure data acquisition system comprises a wall body 1, a pressure data acquisition module 2, an analog-to-digital conversion module 3 and a control module 4, wherein the pressure data acquisition module 2, the analog-to-digital conversion module 3 and the control module 4 are arranged inside the wall body 1 and are connected.
The pressure data acquisition module 2 is used for acquiring a tennis pressure signal at a tennis impact position on the surface of a wall body; the analog-to-digital conversion module 3 is used for converting the tennis pressure signal into a digital signal; the control module 4 is configured to obtain parameter information of a tennis ball hitting the wall surface based on the tennis ball serving position, the tennis ball hitting position, and the digital signal, where the parameter information includes tennis ball departure information and hitting force information.
Specifically, in the intelligent tennis training wall system provided in the embodiment of the present invention, the wall 1 may be an electronic product, and the interior of the intelligent tennis training wall system includes the pressure data acquisition module 2, the analog-to-digital conversion module 3, and the control module 4, and the pressure data acquisition module 2 may be a pressure sensor, and is configured to acquire a tennis pressure signal at a tennis ball striking position on the wall surface, where the tennis ball striking position refers to a position of a contact point between a tennis ball and the wall surface, and may be represented by a height, from the ground, of the contact point between the tennis ball and the wall surface. The pressure data acquisition module 2 can complete a signal acquisition part by means of a resistance strain type pressure sensor.
The tennis ball pressure signal may be an analog signal measured by a pressure sensor, and needs to be converted into a digital signal by the analog-to-digital conversion module 3. The analog-to-digital conversion module 3 is specifically an a/D converter, and may adopt a 24-bit a/D conversion chip HX711 or an 8-bit a/D conversion chip.
HX711 is a 24-bit A/D conversion chip designed specifically for high precision electronic scales. Compared with other chips of the same type, the chip integrates peripheral circuits required by other chips of the same type, such as a voltage-stabilized power supply, an on-chip clock oscillator and the like, and has the advantages of high integration level, high response speed, strong anti-interference performance and the like. The cost of the whole electronic scale is reduced, and the performance and the reliability of the whole electronic scale are improved. The chip and the interface and programming of the MCU at the rear end are simple, all control signals are driven by pins, and the programming of a register in the chip is not needed. The input selection switch can arbitrarily select the channel A or the channel B to be connected with the low-noise programmable amplifier inside the input selection switch. The programmable gain of channel a is 128 or 64, and the corresponding full scale differential input signal amplitude is ± 20mV or ± 40mV, respectively. Channel B has a fixed 32-gain for system parameter detection. The stabilized voltage power supply provided in the chip can directly provide power for the external sensor and the A/D converter in the chip, and no additional analog power supply is needed on the intelligent tennis training wall system. The on-chip clock oscillator does not require any external devices. The power-on automatic reset function simplifies the initialization process of starting. The circuit schematic of HX711 is shown in fig. 2.
And obtaining parameter information of the tennis ball impacting the surface of the wall body through the control module 4 according to the tennis ball serving position, the tennis ball impacting position and the digital signal. The control module 4 may be a Micro Controller Unit (MCU), and the MCU may be configured on an AT89C51 development board and receive the digital signal converted by the analog-to-digital conversion module 3 through a serial port. The AT89C51 development board has a total of 4 16-bit timers, two compatible timers/counters, a rising edge interrupted PCA module, and a universal full duplex asynchronous serial interface (UART). Wherein, the Power Down mode of the AT89C51 development board can be awakened by the external interrupt, and the 16-bit timer can be a T0 timer or a T1 timer. The circuit schematic of the AT89C51 development board is shown in fig. 3. A schematic circuit diagram of the pressure data acquisition module 2, the HX711 and the MCU of the single chip microcomputer is shown in fig. 4. In fig. 4, L1 is used to isolate the analog and digital power supplies, and Q1 is used to turn off the pressure data acquisition module 2 from the AD power supply.
The tennis serve position is the serve position of the trainer and can be represented by the distance between the tennis serve position and the wall body 1. The tennis serve position can be a pre-selected set position, namely, the parameter information of the tennis can be accurately determined only by ensuring that a trainer serves at the tennis serve position. The parameter information of the tennis ball impacting the surface of the wall body can comprise the boundary information and the impact strength information of the tennis ball, wherein the boundary information of the tennis ball is used for indicating whether a landing point of the tennis ball in a real scene is in a court or not, and the tennis ball does not go out if the landing point is in the court, otherwise, the tennis ball goes out. The out-of-range information can be determined by the tennis serving position and the tennis impact position and combining an object oblique throwing motion equation. The impact strength information is a digital signal corresponding to the tennis ball impacting the surface of the wall body.
Besides, the parameter information of the tennis ball can also comprise the hitting quantity, the range of the upper area and the lower area of the tennis net belt, the ball speed, the range and the like.
According to the intelligent tennis training wall system provided by the embodiment of the invention, the wall body is an electronic device, the structure is simple, the intelligent tennis training wall system is movable, and the cost is low. Moreover, due to the fact that the pressure data acquisition module, the analog-to-digital conversion module and the control module are arranged in the wall body, a trainer can automatically determine parameter information of tennis balls during wall hitting training, the position of a tennis ball falling point is judged, a coach does not need to carry out artificial fuzzy judgment, accuracy can be guaranteed, and labor cost is reduced.
On the basis of the above embodiment, the intelligent tennis training wall system provided in the embodiment of the present invention includes a wall body including a transparent top plate, a display plate and a bottom plate, which are vertically arranged;
the transparent top plate is fixedly connected with the bottom plate through a support column;
the display plate is fixed between the transparent top plate and the bottom plate;
the pressure data acquisition module is arranged between the transparent top plate and the bottom plate;
the display board is connected with the control module and used for displaying the parameter information.
Specifically, as shown in fig. 5, the wall 1 in the intelligent tennis training wall system provided in the embodiment of the present invention includes a transparent top plate 11, a display plate 12, and a bottom plate 13, which are vertically arranged, where the transparent top plate 11 on the uppermost layer is a wall surface, and may be made of organic glass or toughened glass, and the thickness is about 15 mm. The display board 12 in the middle layer may be an LED display screen based on a light guide plate, and information such as characters and numbers is displayed by a plurality of LED lamps distributed. In the embodiment of the invention, the tennis pressure signal can be sampled by the HX711, then the analog signal obtained by sampling is converted into the digital signal which can be identified by the MCU control module of the single chip microcomputer, and then the digital signal is converted into the information which can be identified by the LED display screen through the MCU control module of the single chip microcomputer.
Besides, the display board 12 may also be an LCD display, which is not limited in the embodiment of the present invention.
The display board 12 also has integrated therein related circuit devices for display control and data processing. The bottom plate 13 of the lowest layer plays a role of auxiliary support. A plurality of support columns may be disposed between the transparent top plate 11 and the bottom plate 13. For example, 4 posts may be disposed between the transparent top and bottom panels 11 and 13, the 4 posts being disposed at four corners of the display panel 12.
As shown in fig. 5, the wall 1 may further include an outer frame 14, a circuit board 15, and a light source 16, where the outer frame 14 is used to fix edges of the transparent top plate 11, the display plate 12, and the bottom plate 13, the circuit board 15 is used to electrically connect the pressure data acquisition module with the control module, and the display plate with the control module, and the light source 16 is used to provide a light beam and irradiate the light beam to a side surface of the light guide plate, so that the light guide plate converts the light beam into a planar light, so as to display information such as text and numbers. The wall 1 further comprises a reflective layer 17 for improving the conversion rate of the light guide plate.
On the basis of the above embodiment, in the intelligent tennis training wall system provided in the embodiment of the present invention, the pressure data acquisition module includes a pressure sensor, and the pressure sensor is a resistance strain type pressure sensor or a piezoelectric sensor.
Specifically, the pressure sensor can be a resistance strain type pressure sensor, the resistance strain type pressure sensor mainly comprises an elastic body and a resistance strain gauge cable, the internal circuit adopts a Wheatstone bridge, and when the elastic body bears load and deforms, the resistance value changes (increases or decreases) after the resistance strain gauge (conversion element) is stretched or compressed to deform, so that the bridge loses balance, and a corresponding differential signal is generated for subsequent circuit measurement and processing. A schematic circuit diagram of a resistive strain gauge pressure sensor is shown in fig. 6. The pressure sensors may also be piezoelectric sensors, each provided with a piezoelectric patch.
The pressure sensors may be disposed under the transparent top plate and between the transparent top plate and the bottom plate, and the number of the pressure sensors may be one or more. Each pressure sensor may be correspondingly provided with a tightness adjusting means, which may be a screw disposed through the bottom plate, one end of the head of the screw being left outside the bottom plate and the other end being in contact with the bottom of the pressure sensor. Preferably, 4 pillars may be disposed between the transparent top plate and the bottom plate, the 4 pillars are disposed at four corners of the display board, one pressure sensor is disposed between two pillars at one side of the display floor, and the other pressure sensor is disposed between two pillars at the opposite side of the display board.
When the pressure sensor is a piezoelectric sensor, if tennis balls strike the transparent top plate on the uppermost layer, the transparent top plate deforms, so that the piezoelectric sheet also deforms, and the piezoelectric sensor generates charges and converts the charges into voltage.
On the basis of the above embodiment, in the intelligent tennis training wall system provided in the embodiment of the present invention, the pressure data acquisition module further includes a filter and a signal amplifier;
the pressure sensor, the filter and the signal amplifier are sequentially connected, and the signal amplifier is connected with the analog-to-digital conversion module.
Specifically, the pressure data acquisition module further comprises a filter and a signal amplifier, wherein noise data in the data obtained by the pressure sensor is filtered by the filter, and the data with the noise data filtered is amplified by the signal amplifier to obtain the tennis pressure signal.
After the tennis pressure signal is obtained, the tennis pressure signal can be converted into a digital signal through the analog-to-digital conversion module, and the display board is controlled by the control module to display corresponding information. Wherein, pressure data acquisition module, analog-to-digital conversion module and control module all can the integrated setting on the show board.
The pressure change caused by different force when the tennis ball hits the transparent top plate is controlled by the control module, and the numbers and characters on the display board can be changed.
On the basis of the above embodiment, the intelligent tennis training wall system provided in the embodiment of the invention further comprises a sound generating device, wherein the sound generating device is connected with the control module;
when the pressure data acquisition module acquires the tennis pressure signal, the control module controls the sound production device to produce sound.
Specifically, in the embodiment of the present invention, the intelligent tennis training wall system further includes a sound generating device, and the sound generating device may generate a sound when the transparent top plate receives an impact, or may further change the sound according to the magnitude of the tennis pressure signal, that is, the difference of the impact resilience.
As shown in fig. 7, the structural schematic diagram of the intelligent tennis training wall system provided in the embodiment of the present invention is shown, where the intelligent tennis training wall system includes a pressure sensor, a 24-bit a/D chip XH711, and a 51-chip main control chip, and the 51-chip main control chip can control sound prompt and LCD display, and can control power supply. Tennis pressure signals are sensed by a pressure sensor, analog signals are converted into digital signals through a 24-bit A/D conversion chip HX711, and the digital signals are transmitted to a 51-singlechip main control chip. The main control chip of the 51 single chip microcomputer can accurately judge which pressure sensor changes according to the change value of the tennis pressure signal.
On the basis of the above embodiment, in the intelligent tennis training wall system provided in the embodiment of the present invention, the control module is specifically configured to:
determining the out-of-bounds information based on the tennis serving location and the tennis impact location;
determining the impact strength information based on the digital signal.
Specifically, in the embodiment of the present invention, the control module may determine the tennis ball boundary information according to the tennis ball serving position and the tennis ball hitting position. If the tennis ball striking position is within the range of the effective striking height of the wall surface when the tennis ball serving position is fixed, the tennis ball can be determined not to be out of bounds. Here, the tennis ball serving position may be a position away from the wall 11.885m (unit: meter, representing half length of the court), and the effective impact height of the wall surface may be preset to 1m-3m, i.e. the tennis ball impact position is 1m-3m away from the ground. And finally, obtaining digital signals which are the impact strength information of the tennis balls by the analog-to-digital conversion module.
On the basis of the above embodiment, in the intelligent tennis training wall system provided in the embodiment of the present invention, the control module is further configured to:
and determining serving recommendation information of the tennis ball based on the tennis serving position, the actual court length and the effective impact height of the wall surface.
In particular, since tennis balls are at a certain initial velocity v0The tennis ball is shot out obliquely to impact the surface of a wall body, and under the condition that air resistance can be ignored, the tennis ball makes oblique throwing motion, namely, uniform variable speed curve motion, and the motion track of the tennis ball is parabolic. As shown in FIG. 8, the origin of coordinates 0 is the tennis serve position, v0The initial speed of the tennis ball at the serving position is shown as x-axis, which is the inward direction perpendicular to the surface of the wall, and y-axis, which is the upward direction parallel to the surface of the wall.
According to the motion independence principle, the oblique projectile motion can be regarded as the combined motion of uniform linear motion in the horizontal direction and vertical projectile motion to be processed or processed along v0The combined motion of the directional linear motion and the free falling body motion, and the three elements of the oblique projectile motion are the range, the shooting height and the flight time.
The maximum height formula that the inclined projectile motion can reach:
Figure BDA0002950074900000101
under the condition of neglecting air resistance, the decomposition speed is as follows:
speed in horizontal direction: v. of1＝v0cosθ
Speed in vertical direction: v. of2＝v0sinθ-gt
Displacement in the horizontal direction: x ═ vxt＝(v0cosθ)t
Displacement in the vertical direction: y ═ yxt+(1/2)(-g)t2＝(v0sinθ)t-(1/2)gt2
From the formula v2＝v0sin θ -gt, available as v2When 0, the time taken for tennis to reach the highest point is:
Figure BDA0002950074900000111
so that the tennis time is
Figure BDA0002950074900000112
The highest point that tennis can reach is the shooting height, and the horizontal displacement from the throwing point to the landing point is the shooting range. The horizontal range of tennis balls is:
Figure BDA0002950074900000113
as can be seen from the above equation, sin2 θ has the maximum value when θ is 45 ° and 2 θ is 90 °, so that the throw distance is the farthest when θ is 45 ° and the throw distance is the maximum when θ is 45 °.
Three major constants of the inclined throwing motion involved in the impact of the tennis ball on the surface of the wall body are as follows:
shooting time T:
Figure BDA0002950074900000114
the ejection height H:
Figure BDA0002950074900000115
range R:
Figure BDA0002950074900000116
therefore, the skew motion trajectory equation:
y＝(v0sinθ)(x/(v0cosθ))-(g/2)(x/(v0cosθ))2
＝(tanθ)x-(gx2/(2(v0cosθ))2)
the tennis serving position can be 11.885m away from the wall, the height of the tennis net on the wall is 1m, the effective impact height of the wall surface is 1m-3m, and the upper and lower boundaries of the wall surface are respectively positioned at an inclination angle
Figure BDA0002950074900000117
And
Figure BDA0002950074900000118
in the range of the angle of the projectile
Figure BDA0002950074900000119
Calculated to obtain
Figure BDA00029500749000001110
Namely 4.4 degrees < theta < 56.5 degrees.
From the range of
Figure BDA00029500749000001111
Calculating a range of
Figure BDA00029500749000001112
When S is less than or equal to 22.77, i.e
Figure BDA00029500749000001113
The ball is not out of bounds, so that the wall hitting speed v when the tennis ball serving position is 11.885m away from the wall body is calculated0Less than or equal to 15m/s, converted into v0When the ball is less than or equal to 54km/h, the ball does not go out of bounds. At this time, the hitting speed can be used as tennis ball serving recommendation information to prompt a trainer and a coach.
Similarly, it can be based on the theorem of momentum Fnt＝mv0Theorem of kinetic energy
Figure BDA0002950074900000121
Calculating the striking force FnThe range of (1), i.e., the data range detected by the pressure sensor, may be a range in which T and R are estimated at the time of emission.
In a word, the data can be conveniently obtained by calculation, such as effective data of the number of batting, the speed of the ball, the range, the out-of-range state, the force, the shooting time, the shooting height and the like, and the trainer and the coach are displayed or reminded through the output of the controller.
On the basis of the above embodiment, the intelligent tennis training wall system provided in the embodiment of the present invention further includes a client terminal, wherein the client terminal is in communication connection with the control module;
and the client terminal is used for receiving the parameter information, performing statistical analysis on the parameter information, obtaining a statistical analysis result and displaying the statistical analysis result.
Specifically, a complete 'wall hitting + APP' exercise mode is constructed in the embodiment of the invention. The tennis training wall can accurately track and measure the movement and collision information of a tennis object through the pressure sensor, for example, the ball impacts a certain part of the wall, a sensing signal is transmitted to the server, and then various indexes of a trainer are compared and analyzed through a client terminal, namely Application (APP), so that data monitoring is realized. The various indicators may include: the number of the hit balls, the force, the range of the upper area and the lower area of the wall ball net belt, the ball speed, the range, the judgment of the out-of-range state and the like. The parameter information obtained by the control module is uploaded to the APP for storage and processing, so that printout, drawing of comparison tables or progress graphs, target completion conditions and the like are realized, and a coach and a trainer can clearly see the progress conditions of batting. The self-training can be carried out according to the individual time and the skill level, and the self-training is convenient and quick.
In the embodiment of the invention, based on the measurement and display of the AT89C51 singlechip, the pressure is firstly converted into an electric signal through the pressure sensor, then the electric signal is amplified through the signal amplifier and sent to the magic conversion module, then the analog signal is converted into a digital signal which can be identified by the singlechip, then the digital signal is converted into information which can be identified by the LED display through the singlechip, and finally the information is displayed and output. In the display process, various data and commands can be input into the intelligent tennis training wall system through the keyboard, the single chip microcomputer is in a preset functional state, and required numerical values are displayed.
The communication line between the singlechip and the HX711 can comprise DOUT and PDSCK, the sound-producing device can be a buzzer, the alarm signal line of the buzzer can be beep, the alarm signal line can be alert, the serial communication lines can be RXD and TXD, and the RXD and the TXD can also be used for serial ISP downloading of the singlechip program.
In the embodiment of the invention, the pressure receiving test is carried out on the intelligent tennis training wall system, and a PC, a pressure sensor, a 24-bit A/D conversion chip HX711, an AT89C51 development board and an LCD are required in a hardware test environment. The whole system software testing environment needs a Windows10 operating system, a Keil uVision4 integrated development environment, Microsoft Visual C + + 2008 Redistribution environments, development environments such as Microsoft. The whole testing process is finished in a working room.
The pressure data acquisition module and the analog-to-digital conversion module transmit digital signals obtained by converting tennis pressure signals to the 89C51 development board through serial port communication, and then the 89C51 development board processes the digital signals and displays parameter information of tennis balls obtained through processing on an LCD.
The 89C51 development board can be connected with a client terminal in a communication mode through a wifi module. The ESP8266 can be selected for the wifi module, and the IOtechn is selected for the server platform. The method comprises the following specific steps:
the first step is as follows: logging in IOTECHN website
(1) Key for secrekey 8266 and device connection;
(2) adding/checking commands, and controlling the single chip microcomputer through the operation;
(3) parameters are added/checked, and the single chip microcomputer is controlled to feed back the parameters to 8266 and the server through the operation. The command is transmitted to the singlechip in a hexadecimal message form.
The second step is that: connecting mobile phone
Meanwhile, the server is directly connected to the WeChat, and the Iotechn controller of the WeChat is opened. The mobile phone is connected with the server through the WeChat.
The third step: configuration of ESP8266
And (3) SDK development, namely, using a burning tool and a serial port tool to burn firmware in a download mode, and correspondingly welding a circuit capable of controlling the gpio state.
The fourth step: communication between ESP8266 and single chip microcomputer
And 5v serial communication with a 3.3v serial port is adopted.
The fifth step: and programming the single chip microcomputer.
In summary, the embodiment of the invention provides an intelligent tennis training wall system based on a single chip microcomputer and APP control, which can accurately track the movement and collision of tennis balls. The intelligent design of interest can be realized, the convenience and high efficiency are realized, and the children are particularly attracted. The intelligent training wall capable of carrying out data analysis such as algorithm design without boundary is designed according to actual requirements of sports training, so that common training of the wall body becomes statistical training with scientific significance, the data analysis technology of computer science is practical application in the field of sports training, belongs to the field of interdisciplinary science, and has high application value.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. An intelligent tennis training wall system, comprising: the pressure data acquisition module and the analog-to-digital conversion module are connected with the control module;
the pressure data acquisition module is used for acquiring tennis pressure signals at a tennis impact position on the surface of a wall body;
the analog-to-digital conversion module is used for converting the tennis pressure signal into a digital signal;
the control module is used for obtaining parameter information of tennis hitting the surface of the wall body based on a tennis serve position, the tennis hitting position and the digital signal, wherein the parameter information comprises boundary information and hitting strength information of the tennis, and the tennis serve position is a pre-selected set position;
the control module is further configured to:
determining serve recommendation information of the tennis ball based on the tennis serving position, the actual court length and the effective impact height of the wall surface, wherein the serve recommendation information comprises a wall hitting speed;
the sound generating device is connected with the control module;
when the pressure data acquisition module acquires the tennis pressure signal, the control module controls the sound generating device to generate sound and changes the sound according to the tennis pressure signal;
the wall body comprises a transparent top plate, a display plate and a bottom plate which are vertically arranged;
the transparent top plate is fixedly connected with the bottom plate through a support column;
the display board is fixed between the transparent top board and the bottom board;
the pressure data acquisition module is arranged between the transparent top plate and the bottom plate;
the display board is connected with the control module and is used for displaying the parameter information;
the wall comprises an outer frame, a circuit board and a light emitting source; the outer frame is used for fixing the edges of the transparent top plate, the display plate and the bottom plate; the circuit board is used for electrically connecting the pressure data acquisition module with the control module and the display board with the control module; the light source is used for providing light beams and irradiating the light beams to the side face of the light guide plate; the wall body also comprises a reflective layer.
2. The intelligent tennis training wall system of claim 1, wherein the display board comprises in particular an LED display screen or an LCD display screen.
3. The intelligent tennis training wall system of claim 1, wherein the control module is specifically configured to:
determining the out-of-bounds information based on the tennis serving location and the tennis impact location;
determining the impact strength information based on the digital signal.
4. The intelligent tennis training wall system of claim 1, further comprising a client terminal, wherein the client terminal is communicatively coupled to the control module;
and the client terminal is used for receiving the parameter information, performing statistical analysis on the parameter information, obtaining a statistical analysis result and displaying the statistical analysis result.
5. The intelligent tennis training wall system of any one of claims 1-4, wherein the pressure data collection module comprises a pressure sensor that is a resistive strain gauge pressure sensor or a piezoelectric sensor.
6. The intelligent tennis training wall system of claim 5, wherein the pressure sensor is a plurality of pressure sensors.
7. The intelligent tennis training wall system of claim 5, wherein the pressure data acquisition module further comprises a filter and a signal amplifier;
the pressure sensor, the filter and the signal amplifier are sequentially connected, and the signal amplifier is connected with the analog-to-digital conversion module.
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Citations (1)

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Publication number Priority date Publication date Assignee Title
CN102512813A (en) * 2011-12-30 2012-06-27 哈尔滨师范大学 Non-contact-type tennis drop point training device and method for obtaining accuracy rate of tennis drop point

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CN102921159B (en) * 2012-11-15 2015-12-09 陈永宏 Intelligent tennis ball training system
CN110494195B (en) * 2017-04-10 2023-10-03 安可合伙人公司 golf system
CN109224415B (en) * 2018-10-29 2020-09-04 瑞安市众人体育培训有限公司 Portable tennis technical training simulator
CN109224416A (en) * 2018-11-23 2019-01-18 东莞职业技术学院 A kind of tennis training practice system
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