A device for measuring the number of rotations in a jump installed on figure skating skates

Abstract

The present invention discloses a jump cycle measurement device installed on figure skating skates, which includes an intelligent sensor, an intelligent sensor fixture, a self-locking device, and an intelligent device; the bottom of the main body of the intelligent sensor fixture is connected to the intelligent sensor; the self-locking device is connected to the top end of the intelligent sensor fixture main body, and the self-locking device clamps the intelligent sensor fixture at the structural hole at the bottom of the skate; the intelligent sensor is connected to the intelligent device through wireless transmission technology. The intelligent sensor of the present invention is installed at the bottom of the skate through the intelligent sensor fixture, is universal for skate numbers, can be simply installed and removed at any time, is light in weight and has no sense of wearing; moreover, the acceleration and angular acceleration information collected by the intelligent sensor helps to accurately calculate the number of rotations of the toe tip.

Description

Technical Field

[0001] The present invention relates to the technical field of figure skating, and more specifically, to a jump revolution measurement device installed on figure skating skates. Background Art

[0002] Currently, the technical movements of figure skating include skating, footwork, jumps, and spins, among which the jump is the key core technique for athletes to win. The jump is divided into four stages: preparation, takeoff, in-air, and landing. With the innovation of jump techniques, the current world's highest jump revolution has reached 4 revolutions, and there are even athletes trying the difficulty of 4.5 revolutions. While athletes are constantly challenging higher difficulties, some problems of revolution shortage have emerged in the takeoff and landing links.

[0003] The judging system of figure skating is divided into two parts. A group of technical officials respectively confirm the names and grades of the technical movements completed by the athletes. Another group of judges, based on the names and technical grades of the technical movements given by the technical group, then give the quality score and program content score of the movement. Finally, the scores given by the two groups are added together to form the final score of the athlete.

[0004] Regarding the problem of revolution shortage, the figure skating rules also give corresponding penalty criteria. For example, when the revolution shortage of a jump is greater than or equal to 180°, it will be downgraded; when the revolution of a jump is greater than 90° and less than 180°, 70% of the basic score of the jump will be obtained; when the revolution of a jump is equal to 90°, the basic score of the jump will be obtained, but a deduction will be given in the quality score of the judges. This series of penalties for jump revolutions are based on the rules as a lever to restrict the integrity of the athlete's jump revolutions.

[0005] However, in actual training, the coach gives guidance from the sidelines while the athlete trains on the ice. For each jump training of the athlete, the coach cannot enter the ice rink to confirm the revolutions for every movement. Therefore, there are still differences in the understanding of revolution confirmation. In a competition, a movement with insufficient jump revolutions can greatly affect the final result. The current jump movement evaluation has the following problems:

[0006] 1. It is difficult to achieve subjective unity in the judgment criteria for takeoff and landing moments in competitions and training, and the conclusions obtained by different people observing from different angles may be biased;

[0007] 2. In training, it is mainly evaluated through subjective feelings, sometimes with a large difference from the actual situation, which is not conducive to accurately adjusting the force and technical details during training;

[0008] 3. In competitions, experts' subjective judgments on takeoff, landing, and rotation angles by watching replay videos often lead to disputes, thus bringing uncertainty to the competition scoring;

[0009] 4. The method for calculating the number of rotations in figure skating based on the combination of deep learning and machine vision requires the cooperation of a multi-camera array (industrial cameras) to obtain relatively accurate results. Usually, the videos collected by uncalibrated cameras during the competition cannot obtain accurate rotation counting results. Therefore, the application scope of this method is limited.

[0010] Therefore, how to provide a device for measuring the number of rotations of a figure skating jump installed on a figure skating skate to solve at least one of the above technical problems. Summary of the Invention

[0011] In view of this, the present invention provides a device for measuring the number of rotations of a figure skating jump installed on a figure skating skate. By installing an intelligent sensor on the skate, it helps to calculate the number of rotations in the air based on the takeoff time and landing time of the athlete, can give feedback on insufficient rotation numbers of the athlete during training, save the time for the coach to enter the ice rink to confirm the rotation numbers, improve the training efficiency, help the athlete form a correct sense of space and time, ensure the accuracy of the number of rotations of the jump action, and improve the sports performance.

[0012] To achieve the above object, the present invention adopts the following technical solution: A device for measuring the number of rotations of a figure skating jump installed on a figure skating skate, comprising an intelligent sensor, an intelligent sensor fixture, a self-locking device, and an intelligent device; the bottom of the main body of the intelligent sensor fixture is connected to the intelligent sensor; the self-locking device is connected to the top of the main body of the intelligent sensor fixture, and the self-locking device clamps the intelligent sensor fixture at the structural hole at the bottom of the skate; the intelligent sensor is connected to the intelligent device through wireless transmission technology.

[0013] Preferably, the intelligent sensor includes an acceleration sensor and an angular acceleration sensor; the acceleration sensor and the angular acceleration sensor are respectively connected to the intelligent device through wireless transmission technology; the acceleration sensor is used to measure the acceleration of the skate movement, and the angular acceleration sensor is used to measure the rotation angle of the skate.

[0014] Preferably, the intelligent sensor fixture is provided with a rotation shaft mounting hole, a first mounting hole, a second mounting hole, and a skate slot; the rotation shaft mounting hole and the first mounting hole are located at the two diagonal corners of the same side of the intelligent sensor fixture, and the rotation shaft mounting hole and the first mounting hole are respectively connected to the self-locking device; the skate slot is located in the middle of the main body of the intelligent sensor fixture, and the skate slot is used to place the skate blade; the second mounting hole is located on the plane opposite to the rotation shaft mounting hole and the first mounting hole, and the second mounting hole is used to mount the intelligent sensor.

[0015] Preferably, the self-locking device includes a self-locking cover, steel balls, a spring and a fixing bolt; the self-locking cover is provided with a mounting hole matching the diameter of the rotating shaft mounting hole and a fixing hole matching the diameter of the first mounting hole; the mounting hole and the fixing hole are located on both sides of the self-locking cover; the fixing bolt is used to fix the self-locking cover and the intelligent sensor fixture by passing through the mounting hole and the rotating shaft mounting hole in sequence; the spring is coaxially arranged on the axis where the fixing hole is located, and the steel ball is connected to the side of the spring away from the intelligent sensor fixture; the self-locking cover is used to rotate around the rotating shaft mounting hole, and the steel ball is embedded in the fixing hole to be in a self-locking state.

[0016] Preferably, the intelligent device includes an acceleration evaluation module and an angular acceleration evaluation module; the acceleration evaluation module determines the takeoff and landing moments according to the Z-axis acceleration measured by the acceleration sensor; the angular acceleration evaluation module determines the number of rotations of the ice skates during the takeoff and landing times according to the Z-axis angular acceleration measured by the angular acceleration sensor.

[0017] Preferably, the intelligent device further includes a height jump module for calculating the height of the jump.

[0018] Preferably, the process of determining the takeoff moment is as follows: taking the current moment t1 as a reference, if it is satisfied that within the previous Δt, the Z-axis accelerations obtained by a pair of ice skates are both greater than the takeoff acceleration threshold, then the current moment t1 is the takeoff moment;

[0019] Among them, the formula for the takeoff acceleration threshold is: α th =α zm +β×sd αz , β is a constant, α zm is the average value during the non-jumping process, and sd αz is the variance; the positive direction of the Z-axis is vertically upward;

[0020] The process of determining the landing moment is as follows: first, it is judged that the current moment is in the jumping state; secondly, the Z-axis acceleration is double-integrated from the takeoff moment to obtain the displacement S = 0, and at this time, it is judged that the current moment is the landing moment;

[0021] The process of counting the number of rotations is as follows: between the takeoff of the toe and the landing moment, the angular acceleration of the rotation around the Z-axis is double-integrated, and the result obtained is the change in the angle around the Z-axis.

[0022] As can be seen from the above technical solutions, compared with the prior art, the present invention discloses a jump cycle measurement device installed on figure skating skates. The intelligent sensor is installed at the bottom of the skate through an intelligent sensor fixture, which is universal for skate numbers, can be simply installed and removed at any time, has a light weight and is imperceptible to wear. Moreover, the acceleration and angular acceleration information collected by the intelligent sensor helps to accurately calculate the number of rotations of the toe. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0024] Figure 1 The drawings are schematic structural diagrams provided by the present invention.

[0025] Figure 2 The drawings are schematic diagrams of the positions of the cycle measurement device provided by the present invention.

[0026] In the figures, 1 - fixing bolt, 2 - fixing hole, 3 - self-locking cover, 4 - rotary shaft mounting hole, 5 - second mounting hole, 6 - intelligent sensor, 7 - intelligent sensor fixture, 8 - skate slot, 9 - first mounting hole, 10 - spring, 11 - steel ball. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0028] The embodiments of the present invention disclose a jump cycle measurement device installed on figure skating skates, including an intelligent sensor 6, an intelligent sensor fixture 7, a self-locking device, and an intelligent device; the bottom end of the main body of the intelligent sensor fixture 7 is connected to the intelligent sensor 6 for fixing the intelligent sensor 6 on the skate; the self-locking device is connected to the top end of the main body of the intelligent sensor fixture 7 for clamping the intelligent sensor fixture 7 at the structural hole at the bottom of the skate; the intelligent sensor 6 is connected to the intelligent device through wireless transmission technology, and the intelligent sensor collects the acceleration of the skate and sends it to the intelligent device; the intelligent device obtains the number of rotations of the skate according to the acceleration data. The intelligent device can be a handheld device, which is convenient for experts to view the number of jumps and thus score. The intelligent sensor fixture 7 designed by the present invention installs the intelligent sensor 6 on the front of the skate blade, such asFigure 2 The position where the circle is located helps to calculate the number of rotations in the air based on the take-off time and landing time of the athlete; and the intelligent sensor fixture 7 is universal for ice skate numbers, can be simply installed and removed at any time, and is light in weight and imperceptible to wear.

[0029] In this embodiment, the intelligent sensor 6 includes an angular acceleration sensor, an acceleration sensor, a Bluetooth transmission module, and a power supply module. The acceleration sensor and the angular acceleration sensor are connected to the intelligent device through the Bluetooth transmission module. The angular acceleration sensor is used to collect the angular acceleration of the ice skate movement, the acceleration sensor is used to collect the acceleration of the ice skate movement, and the Bluetooth transmission module is used to send the collected angular acceleration data to the intelligent device. The power supply module provides power for the angular acceleration sensor and the Bluetooth transmission module. Among them, the acceleration data includes acceleration and angular acceleration; the acceleration sensor is used to measure the acceleration in the Z-axis direction of the ice skate movement (the positive direction of the Z-axis is vertically upward), and the angular acceleration sensor is used to measure the angular acceleration in the Z-axis direction of the ice skate rotation.

[0030] In this embodiment, the intelligent sensor fixture 7 is provided with a rotating shaft mounting hole 4, a first mounting hole 9, a second mounting hole 5, and an ice skate slot 8; the rotating shaft mounting hole 4 and the first mounting hole 9 are located at the two diagonal corners of the same side of the intelligent sensor fixture 7, and the rotating shaft mounting hole 4 and the first mounting hole 9 are respectively connected to the self-locking device; the ice skate slot 8 is located between the rotating shaft mounting hole 4 and the first mounting hole 9, and the ice skate slot 8 is used to place the ice blade; the second mounting hole 5 is located on the plane opposite to the rotating shaft mounting hole 4 and the first mounting hole 9, and the second mounting hole 5 is used to mount the intelligent sensor 6. The intelligent sensor fixture 7 provided by the present invention is universal for ice skate numbers, can be simply installed and removed at any time, and is light in weight and imperceptible to wear.

[0031] In this embodiment, the self-locking device includes a self-locking cover 3, steel balls 11, a spring 10, and a fixing bolt 1. The self-locking cover 3 is provided with an installation hole that matches the diameter of the rotating shaft installation hole 4, and a fixing bolt 1 is provided coaxially on the axis of the installation hole. The fixing bolt 1 is used to connect the self-locking cover 3 to the intelligent sensor fixture 7 through the rotating shaft installation hole 4. The self-locking cover 3 is also provided with a fixing hole 2 that matches the diameter of the first installation hole 9, and a spring 10 is arranged coaxially on the axis of this hole. On the side of the spring 10 away from the intelligent sensor fixture 7, there is a steel ball 11, and half of the steel ball 11 is exposed. The installation hole and the fixing hole 2 are located on both sides of the self-locking cover 3. The self-locking cover 3 is used to rotate around the rotating shaft installation hole 4. The fixing bolt 1 plays a role of fixing and rotating the shaft, and fixes the intelligent sensor fixture 7 on the ice skate. Among them, the locking process is as follows: Half of the steel ball 11 is exposed. When the self-locking cover 3 is rotated clockwise around the rotating shaft and is about to move to the first installation hole 9, due to the elastic force of the spring 10, the steel ball 11 is pressed into the first installation hole 9 by the self-locking cover 3. Until the self-locking cover 3 rotates to the point where the fixing hole 2 and the first installation hole 9 completely coincide, the steel ball 11 is embedded in the fixing hole 2 by the elastic force of the spring 10, and the fixing bolt 1 is fixed, thus realizing self-locking.

[0032] In this embodiment, the intelligent device includes an acceleration evaluation module, an angular acceleration evaluation module, and a height jump module. The acceleration evaluation module judges the takeoff and landing moments according to the Z-axis (vertical direction) acceleration measured by the acceleration sensor. The process of judging the takeoff moment is as follows: Taking the current moment t1 as a reference, if it satisfies that within the previous Δt, the Z-axis accelerations obtained by a pair of ice skates are both greater than the takeoff acceleration threshold, the formula is:

[0033] α z1 >α th and α z2 >α th

[0034] Then the current moment t1 is the takeoff moment. The formula for the takeoff acceleration threshold is: α th =α zm +β×sd αz , β is a constant, α zm is the average value during the non-jumping process, sd αz is the variance; The positive direction of the Z-axis is vertically upward;

[0035] The process of determining the landing moment is as follows: First, it is determined that the current moment is the takeoff moment, and the athlete is in the jumping state during the subsequent time period; after takeoff, the Z-axis velocity gradually decreases to 0 (this is the highest point of the jump), and then the athlete accelerates in the negative Z-axis direction, that is, starts to fall; when the negative Z-axis velocity is 0, it is the landing moment. The total displacement of the athlete along the Z-axis from the takeoff moment to the landing moment is 0. Therefore, when the displacement S obtained by integrating the acceleration twice from the takeoff moment is 0, it is determined that the current moment is the landing moment (at this time, as long as one foot lands, it is judged as landing); the Z-axis distance formula is:

[0036]

[0037] Let the moment when the athlete's displacement along the Z-axis is 0 be the landing time t end ; α z (t) is the Z-axis acceleration at the current moment;

[0038] The angular acceleration evaluation module determines the number of rotations of the ice skate during takeoff and landing based on the Z-axis angular acceleration measured by the angular acceleration sensor; the process of counting the number of rotations is as follows: between the takeoff of the toe and the landing moment, the angular acceleration around the Z-axis is integrated twice, and the integration formula is:

[0039] r z =∫∫α(t)dt

[0040] α(t) is the Z-axis angular acceleration at the current moment;

[0041] The result obtained at this time is the change in angle around the Z-axis. The change in angle for one week is 360°. According to the change in angle around the Z-axis divided by the change in angle for one week, the number of rotations can be obtained.

[0042] The height jump module calculates the height of the jump based on the Z-axis takeoff velocity, and the height formula is:

[0043] h = v z / 2g

[0044] where v z is the Z-axis takeoff velocity. After takeoff, the Z-axis velocity gradually decreases to 0 (this is the highest point of the jump). Integrating the Z-axis acceleration once from the takeoff moment to the time when the Z-axis positive velocity is 0 gives the takeoff velocity, and the smaller value of the velocity values calculated for the two ice skates is selected; g is the acceleration due to gravity;

[0045] The present invention can also calculate the jump time, and the time formula is:

[0046] t = t en d - t1

[0047] where t end is the landing moment, and t1 is the takeoff moment.

[0048] The jump time, jump height, and number of rotation cycles are of great significance for athletes to perceive and correct their own movements during training.

[0049] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0050] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A jump cycle measurement device installed on figure skating skates, characterized in that, It includes an intelligent sensor, an intelligent sensor fixture, a self-locking device, and an intelligent device; The bottom of the main body of the intelligent sensor fixture is connected to the intelligent sensor; The self-locking device is connected to the top of the main body of the intelligent sensor fixture, and the self-locking device clamps the intelligent sensor fixture at the structural hole at the bottom of the ice skate; The intelligent sensor is connected to the intelligent device through wireless transmission technology; The intelligent sensor includes an acceleration sensor and an angular acceleration sensor; the acceleration sensor and the angular acceleration sensor are respectively connected to the intelligent device through wireless transmission technology; the acceleration sensor is used to measure the acceleration of the ice skate movement, and the angular acceleration sensor is used to measure the rotation angle of the ice skate; The intelligent sensor fixture is provided with a rotating shaft mounting hole, a first mounting hole, a second mounting hole, and an ice skate slot; The rotating shaft mounting hole and the first mounting hole are located at the two diagonal corners of the same surface of the intelligent sensor fixture, and the rotating shaft mounting hole and the first mounting hole are respectively connected to the self-locking device; The ice skate slot is located in the middle of the main body of the intelligent sensor fixture, and the ice skate slot is used to place the ice blade; The second mounting hole is located on the plane opposite to the rotating shaft mounting hole and the first mounting hole, and the second mounting hole is used to mount the intelligent sensor; The self-locking device includes a self-locking cover, steel balls, a spring, and a fixing bolt; The self-locking cover is provided with a mounting hole matching the diameter of the rotating shaft mounting hole and a fixing hole matching the diameter of the first mounting hole; the mounting hole and the fixing hole are located on both sides of the self-locking cover; The fixing bolt is used to fix the self-locking cover and the intelligent sensor fixture in sequence through the mounting hole and the rotating shaft mounting hole; A coaxial spring is provided on the axis of the fixing hole, and a steel ball is connected to the side of the spring away from the intelligent sensor fixture; The self-locking cover is used to rotate around the rotating shaft mounting hole, and the steel ball is embedded in the fixing hole to be in a self-locking state.

2. The jumping cycle measurement device installed on figure skating skates according to claim 1, wherein, The intelligent device includes an acceleration evaluation module and an angular acceleration evaluation module; the acceleration evaluation module judges the takeoff and landing moments according to the Z-axis acceleration measured by the acceleration sensor; The angular acceleration evaluation module judges the number of rotations of the ice skate during the takeoff and landing times according to the Z-axis angular acceleration measured by the angular acceleration sensor.

3. The jumping cycle measurement device installed on figure skating skates according to claim 2, wherein, The intelligent device further includes a height jump module for calculating the height of the jump.

4. The jumping cycle measurement device installed on a figure skating skate according to claim 2, characterized in that, The process of judging the takeoff moment is: taking the current moment t1 as a reference, if it satisfies that within the previous Δt, the Z-axis accelerations obtained by a pair of ice skates are both greater than the takeoff acceleration threshold, then the current moment t1 is the takeoff moment; Among them, the formula for the takeoff acceleration threshold is: α th = α zm + β × sd αz , β is a constant, α zm is the average value during the non - takeoff process, and sd αz is the variance; the positive direction of the Z - axis is vertically upward; The process of judging the landing moment is: first, judge that the current moment is in the jumping state; secondly, perform a second integration on the Z-axis acceleration from the takeoff moment to obtain the displacement S = 0, and at this time judge that the current moment is the landing moment; The process of counting the number of rotations is: between the takeoff of the toe and the landing moment, perform a second integration on the angular acceleration of rotation around the Z-axis, and the obtained result is the change amount of the angle around the Z-axis.

Images