CN113301970A - Swing accuracy and replacement identification device for table tennis bat - Google Patents
Swing accuracy and replacement identification device for table tennis bat Download PDFInfo
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- CN113301970A CN113301970A CN201880100326.8A CN201880100326A CN113301970A CN 113301970 A CN113301970 A CN 113301970A CN 201880100326 A CN201880100326 A CN 201880100326A CN 113301970 A CN113301970 A CN 113301970A
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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
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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
- A63B24/00—Electric or electronic controls for exercising apparatus of preceding groups; Controlling or monitoring of exercises, sportive games, training or athletic performances
- A63B24/0087—Electric or electronic controls for exercising apparatus of groups A63B21/00 - A63B23/00, e.g. controlling load
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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
- A63B2220/30—Speed
- A63B2220/34—Angular speed
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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
- A63B2220/40—Acceleration
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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
- A63B2220/807—Photo cameras
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
The invention comprises the following steps: the table tennis bat comprises a handle and a ball striking part, wherein the handle is used for holding the table tennis bat, and the ball striking part is connected with the handle and is used for striking a table tennis ball; a sensor unit provided in the handle for repeatedly storing acceleration information and angular velocity information generated when the table tennis bat is swung; a determination unit which determines swing accuracy by calculating and comparing swing trajectories of the table tennis bat based on the detection information detected by the sensor unit; and a replacement determination unit for calculating and storing an amount of impact applied to the ball striking unit, detecting a change in the amount of impact, and guiding determination of a replacement time point of the ball striking unit.
Description
Technical Field
The present invention relates to a device for determining the swing accuracy and replacement of a table tennis bat, and more particularly, to a device for determining the swing accuracy and replacement of a table tennis bat, which can determine whether a swing is accurate and determine the replacement time of a table tennis bat accurately by analyzing the swing trajectory of a table tennis bat for each technical motion.
Background
Generally, table tennis refers to the ball game that sets up the net in the middle of the table tennis table and hit the table tennis of small and light again to the other side region with the bat and distinguish the victory, because need hit the table tennis of small and light again with the bat, consequently to the competitor, it is vital that the realization is accurate in the match is swung bat motion control and is swung bat dynamics and adjust, because of this kind of characteristic, need through lasting, practice repeatedly swing the bat motion and become proficient in technical motion, simultaneously, still need through lasting, practice repeatedly the natural switching action of positive hand swing bat and reverse hand swing to become proficient in technical motion.
For example, even when the ball is launched and received, which can be called the start action of a table tennis game, the height, speed and direction of the table tennis ball of each service player are different from each other, and the ball can be received effectively only by continuous practice, and thus the attack can be converted.
Therefore, in order to solve the above problems, various types of practice apparatuses have been recently developed, and one example of the table tennis practice apparatus is a table tennis game robot, etc. granted korean patent No. 10-1114595.
The table tennis game robot disclosed in the above patent document includes: the table tennis robot is used for launching table tennis; and a sensor sheet sensor disposed on a table tennis table in a thin film form, which collides with a ball hit by a trainee, and having the above-described structure, in the prior art, the table tennis robot launches the table tennis toward a user, and the sensor sheet sensor is used to detect a drop point of the table tennis hit by the trainee with a racket to control a distance, an angle, and a direction of the table tennis launched from the table tennis robot.
However, the above-described table tennis match robot has a disadvantage in that although the table tennis ball is re-launched toward the user in correspondence with the ball hit by the user, it is difficult to recognize the swing state of the user and to give feedback to the user.
Disclosure of Invention
Technical problem
The present invention has been made in an effort to provide a device for determining the swing accuracy and replacement of a table tennis bat, which can determine the swing accuracy by determining that a table tennis ball is accurately hit when an impact is generated at a predetermined position in a swing trajectory, and can determine that a ball hitting rubber combined with the table tennis bat is lost when an impact value is reduced by continuously storing the impact generated at this time, thereby accurately determining a replacement time point of the ball hitting rubber.
Technical scheme
The swing accuracy and replacement discrimination device of the table tennis bat is characterized by comprising: the table tennis bat comprises a handle and a ball striking part, wherein the handle is used for holding the table tennis bat, and the ball striking part is connected with the handle and is used for striking a table tennis ball; a sensor unit provided in the handle for repeatedly storing acceleration information and angular velocity information generated when the table tennis bat is swung; a determination unit which determines swing accuracy by calculating and comparing swing trajectories of the table tennis bat based on the detection information detected by the sensor unit; and a replacement determination unit for calculating and storing an amount of impact applied to the ball striking unit, detecting a change in the amount of impact, and guiding determination of a replacement time point of the ball striking unit.
Wherein, the replacement judgment unit includes: a detection part arranged on the ball striking part and used for calculating the impact amount by detecting the vibration generated when the table tennis is struck; and a measuring section electrically connected to the detecting section, for determining a replacement time point of the ball striking section at a time point when the impact amount starts to decrease, and provided with an imaging device for imaging the ball striking section.
The measuring section captures an image of the ball striking section by the imaging device to collect a pattern region formed in the ball striking section, and compares the pattern region with a preset reference pattern region to determine a replacement time point of the ball striking section.
The measuring section includes a determining device provided in the ball striking section and selectively moving in the ball striking section when the angle of the table tennis bat changes due to a decrease in friction of the ball striking section.
The measuring unit images an angle between the ball striking unit and the ground at a time point when the determining unit moves in the ball striking unit by the imaging unit, and determines a replacement time point of the ball striking unit by comparing the angle with a preset reference replacement angle.
On the other hand, the above discrimination unit includes: a trajectory calculation unit that calculates a swing trajectory of the table tennis bat based on detection information of the sensor unit; a hitting point determination unit that determines a hitting point at which the table tennis bat hits the table tennis ball, from the swing trajectory calculated by the trajectory calculation unit; and a swing analyzing unit for determining and analyzing whether the swing of the table tennis bat is appropriate based on the hitting point position determined by the hitting point determining unit.
Wherein the determination unit further includes a type determination unit configured to determine a type of swing of the table tennis bat by analyzing the swing trajectory pattern calculated by the trajectory calculation unit, and the swing analysis unit receives standard swing trajectory data corresponding to the swing type determined by the type determination unit from the memory and compares the standard swing trajectory data with the swing trajectory of the table tennis bat calculated by the trajectory calculation unit.
The determination unit may further include a memory for storing standard swing trajectory data different from each other, which are classified based on the types of the table tennis bat, and the swing analysis unit may determine the swing accuracy of the user by comparing the standard swing trajectory data stored in the memory in advance with the swing trajectory of the table tennis bat calculated by the trajectory calculation unit.
The trajectory calculation unit includes: a track tracking unit for calculating a movement track of the table tennis bat based on the detection information of the sensor unit; a start point calculation unit that calculates a swing start point at which a swing is started and a swing end point at which the swing is ended, respectively, in the movement trajectory of the table tennis bat calculated by the trajectory tracking unit, based on the detection information of the sensor unit; and a swing trajectory determination unit configured to calculate a movement trajectory between the swing start point and the swing end point calculated by the start point calculation unit as a swing trajectory of the table tennis bat.
The sensor unit detects an acceleration and a moving direction of the table tennis bat, and the start point calculation unit determines, as a swing start point, a position where the moving direction of the table tennis bat is changed and the acceleration of the table tennis bat is smaller than a preset first acceleration, and determines, as a swing end point, a position where the acceleration of the table tennis bat after the swing start point is smaller than a preset second acceleration, in the moving trajectory calculated by the trajectory tracking unit.
ADVANTAGEOUS EFFECTS OF INVENTION
The present invention has the following effects that the swing data of the professional who becomes the technical standard including the information of the swing acceleration and the swing angle is stored in advance, the swing data of the professional and the swing data of the user are compared and converted into the score for providing, and whether the swing is accurate or not can be effectively judged by comparing the score.
Furthermore, the present invention has the effect that the accuracy of the swing can be determined by judging that the table tennis ball is accurately hit when the impact amount is generated at the preset position in the swing trajectory, and the loss of the hitting rubber combined with the table tennis bat is judged when the impact amount is reduced by continuously storing the impact amount generated at this time.
When the loss of the batting rubber is judged, the pattern distribution caused by abrasion is mastered by the shooting device, and meanwhile, the replacement time point of the batting rubber is accurately judged by measuring the angle between the table tennis bat and the ground when the test board placed on the table tennis bat slides and comparing with the preset judgment data.
Drawings
FIG. 1 is a view schematically showing a swing accuracy and replacement discrimination device of a table tennis bat according to an embodiment of the present invention;
FIG. 2 is a block diagram showing the structure of a device for determining the swing accuracy and replacement of a table tennis bat according to an embodiment of the present invention;
FIG. 3 is a diagram showing a replacement judging unit of the swing accuracy and replacement discriminating device of the table tennis bat according to the embodiment of the present invention;
FIG. 4 is a diagram for explaining an embodiment of determining a replacement time point by a swing accuracy and replacement determination device of a table tennis bat according to an embodiment of the present invention;
fig. 5 is a diagram for explaining another embodiment of determining a replacement time point by a swing accuracy and replacement determination device of a table tennis bat according to an embodiment of the present invention.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The advantages, features and methods of accomplishing the same will become apparent with reference to the following detailed description of embodiments taken in conjunction with the accompanying drawings.
However, the present invention can be implemented in various embodiments, and is not limited to the following embodiments, which are only used to make the disclosure of the present invention complete, so that those skilled in the art to which the present invention pertains can fully understand the scope of the present invention, and only define the present invention according to the protection scope of the present invention.
In describing the present invention, when it is judged that the gist of the present invention is likely to be confused by a related art or the like, detailed description thereof will be omitted.
Fig. 1 is a diagram schematically showing a device for determining the swing accuracy and replacement of a table tennis bat according to an embodiment of the present invention, and fig. 2 is a block diagram showing the structure of the device for determining the swing accuracy and replacement of a table tennis bat according to an embodiment of the present invention.
Fig. 3 is a diagram showing a replacement determination unit of a table tennis bat swing accuracy and replacement determination device according to an embodiment of the present invention, fig. 4 is a diagram for explaining an embodiment of a table tennis bat swing accuracy and replacement determination device according to an embodiment of the present invention determining a replacement time point, and fig. 5 is a diagram for explaining another embodiment of a table tennis bat swing accuracy and replacement determination device according to an embodiment of the present invention determining a replacement time point.
As shown in fig. 1, the swing accuracy and replacement determination device for a table tennis bat of the present embodiment includes a table tennis bat 100, a sensor unit 200, a determination unit 300, and a replacement determination unit 400.
The table tennis bat 100 includes: a grip 110 for holding a table tennis bat; and a ball striking part 120 connected to the handle 110 for striking a table tennis ball.
That is, the table tennis bat 100 is formed to extend in the front-rear direction by a predetermined length so as to be gripped by a user, and the ball striking unit 120 includes: a bottom plate 122 connected to a front end of the handle 110; and a ball striking rubber 124 formed on the upper surface of the sole 122.
Wherein the ball striking rubber 124 covers the upper surface of the sole plate 122, preferably made of a material having a prescribed elasticity, such as rubber, in which case the ball striking rubber 124 having a very high surface viscosity should be used, whereby a user can freely realize advanced techniques of table tennis, such as drawing or chipping, by giving a high rotational force to the table tennis when striking the table tennis through the ball striking part 120.
Although the present embodiment shows a structure in which the ball striking rubber 124 is formed on the upper surface of the sole plate 122, the present invention is not limited thereto, and may be formed on the upper surface and the lower surface of the sole plate 122, respectively, according to the type of the table tennis bat 100.
On the other hand, the sensor unit 200 is provided inside the handle 110 of the table tennis bat 100 for detecting acceleration, moving direction, or position information of the table tennis bat 100.
Although not shown in the drawings, the sensor unit 200 is preferably at least one of an acceleration sensor that can detect motion by calculating an increase/decrease ratio of a velocity of linear motion with respect to a specific direction, a geomagnetic sensor that detects a direction of the table tennis bat 100 by detecting an azimuth angle using an earth magnetic field, and a gyro sensor that can detect a direction in such a manner that an angle value of an object rotating in a unit time on the basis of one axis is used as a numerical value.
Here, the acceleration sensor, the geomagnetic sensor, and the gyro sensor are the same as those commonly used at present, and thus detailed descriptions thereof will be omitted.
Also, the sensor unit 200 may include a first communication module (not shown) for wirelessly transmitting information related to the movement of the table tennis bat 100.
In the present embodiment, although the configuration in which the sensor unit 200 is provided at the rear end portion of the grip 110 is shown, the sensor unit 200 may be provided at the front end portion of the grip 110 or the ball striking portion 120.
On the other hand, the discrimination unit 300 includes: a trajectory calculation unit 310 that calculates a swing trajectory of the table tennis bat 100 based on the detection information of the sensor unit 200; a memory 350 for storing standard swing trajectory data distinguished according to the swing type of the table tennis; a type discrimination unit 340 for discriminating the swing type of the table tennis bat 100 by analyzing the swing trajectory pattern calculated by the trajectory calculation unit 310; a hitting point discriminating unit 320 for discriminating a hitting point of the table tennis bat 100 on the table tennis ball from the swing trajectory calculated by the trajectory calculating unit 310; and a swing analyzing unit 330 for comparing the standard trajectory data stored in the memory 350 with the swing trajectory of the table tennis bat 100 calculated by the trajectory calculating unit 310 to determine the swing accuracy of the user.
On the other hand, although not shown in the drawings, the discriminating unit 300 may further include a second communication module (not shown) for receiving the detection information of the sensor unit 200 transmitted through the first communication module (not shown) of the sensor unit 200.
The trajectory calculation unit 310 includes a trajectory tracking unit 312, a start point calculation unit 314, and a swing trajectory determination unit 316.
The trajectory tracking unit 310 calculates the movement trajectory of the table tennis bat 100 based on the detection information of the sensor unit 200.
The trajectory tracking unit 310 calculates the movement trajectory of the user swinging the table tennis bat 100 based on the acceleration information, the movement direction information, or the position information of the table tennis bat 100 received from the sensor unit 200.
In this case, the trajectory tracking unit 310 preferably calculates the movement trajectory of the table tennis bat 100 from the time point when the user starts to move to the time point when the user ends to move.
The start point calculation unit 314 calculates a swing start point at which the swing is started and a swing end point at which the swing is ended, respectively, in the movement trajectory of the table tennis bat 100 calculated by the trajectory tracking unit 310 based on the detection information of the sensor unit 200.
That is, when the user starts to swing the table tennis bat 100, the user will expect the trajectory of the table tennis ball from the stopped waiting posture and swing the table tennis bat 100, and in this case, the acceleration of the table tennis bat 100 increases in the stopped state and the direction changes rapidly along the trajectory of the table tennis ball, so that the start point calculation unit 314 determines, as the swing start point, a position where the moving direction of the table tennis bat 100 changes and the acceleration of the table tennis bat 100 is smaller than the preset first acceleration, in the moving trajectory calculated by the trajectory tracking unit 312.
Wherein the first acceleration is preferably 0cm/s2To 1cm/s2。
The start point calculation unit 314 determines that the position where the acceleration of the table tennis bat 100 after the start point of the swing is smaller than the preset second acceleration is the swing end point, and when the user ends the swing motion of the table tennis bat 100, the user will be at a point of time after hitting the table tennis ball, and therefore, the user will take a waiting posture of stopping and observe the hitting of the opponent.
Therefore, at the moment when the swing is finished, the user stops the table tennis bat 100, and the acceleration of the table tennis bat 100 is also sharply reduced.
Thus, the start point calculating unit 314 may determine that the position where the acceleration of the table tennis bat 100 after the swing start point is smaller than the second acceleration is the swing end point, and in this case, the second acceleration is preferably 0cm/s2To 1cm/s2。
The swing trajectory determination unit 316 calculates the movement trajectory between the swing start point and the swing end point calculated by the start point calculation unit 314 as the swing trajectory of the table tennis bat 100.
The swing trajectory determination unit 316 supplies the calculated swing trajectory data of the table tennis bat 100 to the type determination unit 340, the hitting ball determination unit 320, and the swing analysis unit 330.
The memory 350 stores standard swing trajectory data that is classified according to the type of swing of the table tennis ball, in other words, the memory 350 stores standard swing trajectory data that is standardized according to the type of swing, for example, a ball drawing, a near billiard ball, a cut billiard ball, a far billiard ball, and the like.
The type discrimination unit 340 receives the swing trajectory of the table tennis bat 100 from the trajectory calculation unit 310, analyzes the pattern of the swing trajectory, and discriminates the swing type of the table tennis bat 100.
The kind discrimination unit 340 discriminates which swing trajectory belongs to a ball drawing, a near billiard, a cut billiard, or a far billiard by analyzing the total length, the shape, the moving direction, and the like of the swing trajectory.
The swing type identifying unit 340 supplies the swing analyzing unit 330 with the identified swing type information.
The hitting point determination unit 320 determines the hitting point of the table tennis bat 100 on the table tennis ball in the swing trajectory calculated by the trajectory calculation unit 310, and in this case, if the table tennis ball collides with the table tennis bat 100 during the swing of the user with the table tennis bat 100, the acceleration of the table tennis bat 100 is reduced by the table tennis ball, and the acceleration reduction time point of the table tennis bat 100 can be determined as the hitting point of the table tennis ball.
Thus, the ball hitting determination unit 320 determines, as the ball hitting point, a position at which the acceleration of the table tennis bat 100 is reduced in the swing trajectory calculated by the trajectory calculation unit 310, based on the detection information supplied from the sensor unit 200.
The swing analysis unit 330 compares the standard trajectory data stored in the memory 350 with the swing trajectory of the table tennis bat 100 calculated by the trajectory calculation unit 310, and thereby determines the swing accuracy of the user.
In this case, the swing analysis unit 330 receives the standard swing trajectory data corresponding to the swing type of the swing trajectory among the standard swing trajectory data stored in the memory 350 based on the swing type information of the swing trajectory supplied from the type discrimination unit 340, and compares the standard swing trajectory data with the swing trajectory of the table tennis bat 100 calculated by the trajectory calculation unit 310.
Although not shown in the drawings, the swing analysis unit 330 may further include a display unit (not shown) such as a display for displaying the result of comparing the standard swing trajectory data with the swing trajectory of the table tennis bat 100 received from the trajectory calculation unit 310.
The display unit may digitally display the coincidence of the swing trajectory of the trajectory calculation unit 310 with respect to the standard swing trajectory data, or may display the standard swing trajectory data and the swing trajectory of the trajectory calculation unit 310 in a superimposed manner.
On the other hand, the swing analyzing unit 330 determines whether or not it is appropriate to analyze the swing of the table tennis bat 100 based on the point of the hitting position determined by the hitting position determining unit 320 in the swing trajectory.
When the range from the swing start point to the preset reference position in the swing trajectory calculated by the trajectory calculation unit 310 is set as the careless range, the swing analysis unit 330 determines that the swing of the user is in the careless state if the hitting point is within the careless range, and determines that the swing of the user is in the excellent state if the hitting point is outside the careless range, and displays the determination result on the display unit.
Here, the most preferable position of the swing trajectory at which the table tennis bat 100 hits the table tennis ball is a position between 2/3 and 3/3 from the swing start point to the total swing length, because if the table tennis bat 100 hits the table tennis ball before the position of the swing trajectory at which the swing start point reaches 2/3 from the total swing length, a small force is transmitted to the table tennis ball only at a time point before sufficient kinetic energy is generated by the swing of the table tennis bat 100, and therefore, it is preferable that the swing analysis unit 330 sets, as the reference position, a position in the swing trajectory at which the separation distance from the swing start point reaches 65% to 70% of the total length of the swing trajectory calculated by the trajectory calculation unit 310.
On the other hand, although the identification unit 300 illustrated in the drawings is a computer, the present invention is not limited thereto, and may be an information processing device such as a notebook computer, a Personal Digital Assistant (PDA), or a smartphone.
Hereinafter, the swing accuracy of the table tennis bat of the present embodiment configured as described above and the operation of the replacement determination device for analyzing the swing accuracy will be described in detail.
First, a user starts a table tennis game or practice using the table tennis bat 100 provided with the sensor unit 200.
In this case, the trajectory tracking unit 312 of the trajectory calculation unit 310 calculates the movement trajectory of the table tennis bat 100, and the start point calculation unit 314 and the swing trajectory determination unit 316 determine the swing start point and the swing end point based on the detection information supplied from the sensor unit 200, and calculate a plurality of swing trajectories in the movement trajectory of the table tennis bat 100 based on the swing start point and the swing end point.
In this case, the swing trajectory calculated by the trajectory calculation unit 310 is supplied to the swing analysis unit 330, and the swing analysis unit 330 receives standard swing trajectory data corresponding to the swing type of each swing trajectory identified by the type identification unit 340 from the memory 350 and compares the standard swing trajectory data with each swing trajectory.
In this case, the swing analysis unit 330 may display, on a display unit (not shown), coincidence information of the swing trajectory of the trajectory calculation unit 310 with respect to the standard swing trajectory data or curve information in which the standard swing trajectory data and the swing trajectory of the trajectory calculation unit 310 overlap each other.
The swing analyzing unit 330 analyzes the swing state of the table tennis bat 100 based on the hitting point information of the table tennis ball determined by the hitting point determining unit 320.
That is, the swing analyzing unit 330 determines whether or not a hitting point for hitting a table tennis ball is preferable throughout the swing motion, and outputs the determination result through a display unit (not shown).
As described above, the swing accuracy and replacement recognition apparatus for a table tennis bat according to the present embodiment can recognize the swing state by calculating the swing trajectory of the table tennis bat 100 using the sensor unit 200 provided in the table tennis bat 100, and thus has an advantage in that a user can easily grasp the correct swing posture.
On the other hand, the swing accuracy and replacement determination device for a table tennis bat of the present embodiment further includes a replacement determination unit 400.
The replacement determination unit 400 calculates and stores the amount of impact applied to the ball striking unit 120 by the table tennis ball, detects the change in the amount of impact, and guides the determination of the replacement time point for the ball striking unit 120, and more specifically, guides the determination of the replacement time point for the ball striking rubber 124 constituting the ball striking unit 120.
For this purpose, the replacement determination unit 400 includes a detection unit 410 and a measurement unit 420.
First, the detection unit 410 is provided in the ball striking unit 120, and detects vibration generated by striking a table tennis ball, thereby calculating the amount of impact.
Preferably, the sensing part 410 is a vibration sensor disposed between the boundary with the grip 110, thereby minimizing direct collision with the table tennis ball and effectively calculating the amount of impact due to vibration generated at the time of collision.
The measuring unit 420 is electrically connected to the detecting unit 410, and the detecting unit 410 determines the time point at which the hitting rubber 124 is replaced at the time point when the impact amount starts to decrease.
Such a measuring part 420 includes a photographing device 420a for photographing the ball striking rubber 124, and may be provided separately from the recognition unit 300 in a smart phone manner, or, when the recognition unit 300 is a smart phone, may have the photographing device 420a and a corresponding application built therein.
The measuring unit 420 photographs the ball striking rubber 124 by the photographing device 420a, and determines a time point for replacing the ball striking rubber 124 by collecting a pattern region a formed on the ball striking rubber 124 as shown in fig. 4 and comparing the pattern region a with a predetermined reference pattern region.
That is, the ball striking rubber 124 is additionally coated with rubber on the upper surface thereof in a state in which the honeycomb-shaped pattern region a is formed inside, and such a pattern region a is gradually exposed to the surface of the table tennis bat 100 due to the collision of the table tennis ball with the ball striking rubber 124 as the table tennis bat 100 is used for a long time, which means that the service life is relatively long if the pattern region a is distributed in a wide range in the ball striking rubber 124.
Therefore, if the measuring section 420 preferentially detects that the impact amount decreases while the impact amount applied to the ball striking rubber 124 is maintained at a predetermined level by the detecting section 410, the measuring section 420 operates the corresponding application to determine whether the ball striking rubber 124 needs to be replaced, and if the application is operated as described above, the operation of the imaging device 420a is activated, and if the surface of the ball striking rubber 124 is thereby imaged by the imaging device 420a, the numerical value of the degree of diffusion of the pattern area portion a formed on the surface of the ball striking rubber 124 is displayed in% manner.
For example, when the display pattern area A is divided into 40% or more of the entire area of the hitting rubber 124, it is determined that the rubber additionally coated on the upper surface of the pattern area A loses friction due to abrasion,
therefore, it can be interpreted that a time required to replace the ball striking rubber 124 has come, and the corresponding contents are notified in a vibration or the like so that the user can accurately grasp the replacement time point of the ball striking rubber 124.
In addition to the above-mentioned method, the determination device 422 may be used to grasp the time point of replacing the ball striking rubber 124, and the determination device 422 may be disposed on the ball striking rubber 124 and selectively move in the ball striking rubber 124 when the angle of the table tennis bat 100 changes due to the decrease in the friction force of the ball striking rubber 124.
In other words, as in the above-described embodiment, when the detection unit 410 detects that the impact amount decreases while the impact amount applied to the ball striking rubber 124 is maintained at a predetermined level, the measurement unit 420 operates the corresponding application program to determine whether the ball striking rubber 124 needs to be replaced, and when the application program is operated as described above, the operation of the imaging device 420a is activated, and the imaging device 420a measures the angle θ between the table tennis bat 100 and the ground at the time point when the determination device 422 slips in the ball striking rubber 124, so that the replacement time point of the ball striking rubber 124 can be accurately grasped.
As will be described in detail below, the imaging device 420a images the angle θ between the table tennis bat 100 and the floor at the time point when the judgment device 422 is detached from the ball striking rubber 124 and compares the angle θ with a preset reference replacement angle, and if it is confirmed that the judgment device 422 moves in the ball striking rubber 124 at the reference replacement angle set to 45 degrees or less, the user can accurately grasp the replacement time point of the ball striking rubber 124 by judging that the friction force of the ball striking rubber 124 is reduced and notifying the corresponding contents by vibration or the like, for example.
Finally, the present invention can accurately determine the replacement time of the striking rubber 124 through the above-mentioned embodiments, thereby always maintaining the optimum state of the striking rubber 124 in the table tennis bat 100.
The present invention has the following effects that the swing data of the professional who becomes the technical standard including the information of the swing acceleration and the swing angle is stored in advance, the swing data of the professional and the swing data of the user are compared and converted into the score for providing, and whether the swing is accurate or not can be effectively judged by comparing the score.
Furthermore, the present invention has the effect that the accuracy of the swing can be determined by judging that the table tennis ball is accurately hit when the impact amount is generated at the preset position in the swing trajectory, and the loss of the hitting rubber combined with the table tennis bat is judged when the impact amount is reduced by continuously storing the impact amount generated at this time.
When the loss of the batting rubber is judged, the pattern distribution caused by abrasion is mastered by the shooting device, and meanwhile, the replacement time point of the batting rubber is accurately judged by measuring the angle between the table tennis bat and the ground when the test board placed on the table tennis bat slides and comparing with the preset judgment data.
Although the above description has been made with reference to the embodiments shown in the drawings, it should be understood that this is merely an example, and various modifications can be implemented by those skilled in the art to which the present invention pertains, and all or a part of the above described embodiments may be configured by being selectively combined. Therefore, the true technical scope of the present invention should be determined according to the scope of the appended claims.
Description of reference numerals
100: a table tennis bat; 110: a handle;
120: a ball striking part; 122: a base plate;
124: a batting rubber sheet; 200: a sensor unit;
300: a discrimination unit; 310: a trajectory calculation unit;
312: a trajectory tracking unit; 314: a starting point calculation unit;
316: a swing trajectory calculation unit; 320: a hitting ball discrimination section;
330: a swing analysis unit; 340: a category identifying section;
350: a memory; 400: a replacement judgment unit;
410: a detection unit; 420: a measurement section;
420 a: a photographing device; 422: a judging device;
a: a pattern region part.
Claims (10)
1. A swing accuracy and replacement identification device for a table tennis bat, comprising:
the table tennis bat comprises a handle and a ball striking part, wherein the handle is used for holding the table tennis bat, and the ball striking part is connected with the handle and used for striking a table tennis ball;
a sensor unit provided in the handle for repeatedly storing acceleration information and angular velocity information generated when the table tennis bat is swung;
a recognition unit recognizing swing accuracy by calculating and comparing swing trajectories of the table tennis bat based on the detection information detected by the sensor unit; and
and a replacement determination unit that calculates and stores an amount of impact applied to the ball striking unit, detects a change in the amount of impact, and guides determination of a replacement time point of the ball striking unit.
2. The swing accuracy and replacement discrimination device of a table tennis bat according to claim 1, wherein the replacement determination unit includes:
a detection unit provided in the ball striking unit for calculating an impact amount by detecting vibration generated when a table tennis ball is struck; and
and a measuring section electrically connected to the detecting section, for determining a replacement time point of the ball striking section at a time point when the impact amount starts to decrease, and provided with an imaging device for imaging the ball striking section.
3. The swing accuracy and replacement discrimination apparatus for a table tennis bat according to claim 2, wherein the measurement unit captures an image of the ball striking unit by the imaging unit to collect a pattern region formed in the ball striking unit, and determines a replacement time point of the ball striking unit by comparing the pattern region with a preset reference pattern region.
4. The swing accuracy and replacement discrimination device for a table tennis bat according to claim 2, wherein the measurement section includes a determination device provided in the ball striking section and selectively moving in the ball striking section when a change occurs in an angle of the table tennis bat due to a decrease in friction force of the ball striking section.
5. The swing accuracy and replacement discrimination device for a table tennis bat according to claim 4, wherein the measurement unit images an angle between the hitting portion and a ground surface at a time point when the determination device moves in the hitting portion, by the imaging device, and determines a replacement time point of the hitting portion by comparing the imaged angle with a preset reference replacement angle.
6. The swing accuracy and replacement discrimination device of a table tennis bat according to claim 1, wherein the discrimination unit comprises:
a trajectory calculation unit that calculates a swing trajectory of the table tennis bat based on detection information of the sensor unit;
a hitting point determination unit that determines a hitting point at which the table tennis bat hits the table tennis ball, from the swing trajectory calculated by the trajectory calculation unit; and
and a swing analyzing unit for determining and analyzing whether the swing of the table tennis bat is appropriate based on the hitting point position determined by the hitting point determining unit.
7. The swing accuracy and replacement discrimination apparatus of a table tennis bat according to claim 6,
the discrimination unit further includes a kind discrimination section for discriminating a kind of swing of the table tennis bat by analyzing the swing trajectory pattern calculated at the trajectory calculation section,
the swing analyzing unit receives standard swing trajectory data corresponding to the swing type identified by the type identifying unit from the memory and compares the standard swing trajectory data with the swing trajectory of the table tennis bat calculated by the trajectory calculating unit.
8. The swing accuracy and replacement discrimination apparatus of a table tennis bat according to claim 6,
the discriminating unit further includes a memory for storing standard swing trajectory data different from each other distinguished based on the kinds of swings of the table tennis bat,
the swing analyzing unit compares the standard swing trajectory data stored in the memory in advance with the swing trajectory of the table tennis bat calculated by the trajectory calculating unit, and thereby determines the swing accuracy of the user.
9. The swing accuracy and replacement recognition apparatus for a table tennis bat according to claim 8, wherein the trajectory calculation unit comprises:
a track tracking unit for calculating a movement track of the table tennis bat based on the detection information of the sensor unit;
a start point calculation unit that calculates a swing start point at which a swing is started and a swing end point at which the swing is ended, respectively, in the movement trajectory of the table tennis bat calculated by the trajectory tracking unit, based on the detection information of the sensor unit; and
and a swing trajectory determination unit configured to calculate a movement trajectory between the swing start point and the swing end point calculated by the start point calculation unit as a swing trajectory of the table tennis bat.
10. The swing accuracy and replacement discrimination apparatus of a table tennis bat according to claim 9,
the sensor unit detects the acceleration and the moving direction of the table tennis bat,
in the movement trajectory calculated by the trajectory tracking section, the start point calculation section determines a position where the movement direction of the table tennis bat is changed and the acceleration of the table tennis bat is smaller than a preset first acceleration as a swing start point, and determines a position where the acceleration of the table tennis bat after the swing start point is smaller than a preset second acceleration as a swing end point.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020180165238A KR102091827B1 (en) | 2018-12-19 | 2018-12-19 | Swing accuracy and change discriminating device of table tennis racket |
| KR10-2018-0165238 | 2018-12-19 | ||
| PCT/KR2018/016286 WO2020130191A1 (en) | 2018-12-19 | 2018-12-20 | Apparatus for determining swing accuracy and replacement of ping-pong racket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113301970A true CN113301970A (en) | 2021-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880100326.8A Pending CN113301970A (en) | 2018-12-19 | 2018-12-20 | Swing accuracy and replacement identification device for table tennis bat |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2022515242A (en) |
| KR (1) | KR102091827B1 (en) |
| CN (1) | CN113301970A (en) |
| WO (1) | WO2020130191A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115025470A (en) * | 2022-06-28 | 2022-09-09 | 上海创屹科技有限公司 | Intelligent table tennis bat, service robot and intelligent table tennis teaching system |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102408196B1 (en) * | 2020-04-21 | 2022-06-13 | 주식회사 고고탁 | Swing analysis system for table tennis |
| CN112915505A (en) * | 2021-03-03 | 2021-06-08 | 贾旭 | Table tennis small norm hand attacking sensing device and sensing method |
| KR20230070739A (en) * | 2021-11-15 | 2023-05-23 | 주식회사 고고탁 | Assembled table tennis racket |
| DE102022112520A1 (en) | 2022-05-18 | 2023-11-23 | janova GmbH | Smart table tennis bat |
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- 2018-12-19 KR KR1020180165238A patent/KR102091827B1/en active IP Right Grant
- 2018-12-20 CN CN201880100326.8A patent/CN113301970A/en active Pending
- 2018-12-20 JP JP2021536338A patent/JP2022515242A/en active Pending
- 2018-12-20 WO PCT/KR2018/016286 patent/WO2020130191A1/en active Application Filing
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| CN101991949A (en) * | 2009-08-27 | 2011-03-30 | 深圳泰山在线科技有限公司 | Computer based control method and system of motion of virtual table tennis |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020130191A1 (en) | 2020-06-25 |
| JP2022515242A (en) | 2022-02-17 |
| KR102091827B1 (en) | 2020-03-20 |
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