JP2016209122A - Impact analysis device, impact analysis system, impact analysis method, and program - Google Patents

Abstract

A hitting position of a hit ball on an exercise equipment is determined with a simple configuration. A striking analysis device has a first axis as an axis along a direction from a grip portion to a hitting ball portion of an exercise instrument, and a second axis along a direction perpendicular to the first axis in the hitting surface of the hitting ball portion. A first inertia output corresponding to the rotation generated around the first axis, and a second inertia output corresponding to the rotation generated around the second axis when the shaft is used, and the exercise apparatus Based on the first inertia output and the second inertia output at the time of impact during the swing, the striking position of the exercise apparatus is determined. [Selection] Figure 1

Description

  The present invention relates to a batting analysis device, a batting analysis system, a batting analysis method, and a program.

  In Patent Document 1, an angular velocity sensor is attached to the grip end of the tennis racket so that one of the detection axes is along the long axis of the tennis racket, and the ball is meated based on the amount of change in angular velocity around the detection axis immediately after impact. A swing analyzer is described that determines whether or not it is doing.

JP 2012-130414 A

  However, in Patent Document 1, it is only possible to determine whether or not a hit ball can be met. That is, the user cannot know, for example, at which position on the hitting surface the hit ball is hit.

  Therefore, an object of the present invention is to determine a hitting position of a hit ball on a sports equipment with a simple configuration.

  One aspect of the present invention that solves the above-described problem is a striking analysis device, in which a first axis is an axis along the direction from the grip portion to the hitting ball portion of the exercise equipment, and the first hitting surface of the hitting ball portion is the first hitting surface. A first acquisition unit configured to acquire a first inertia output corresponding to a rotation generated around the first axis when an axis along a direction orthogonal to the axis is a second axis; and around the second axis A second acquisition unit that acquires a second inertia output corresponding to the generated rotation, and a striking position in the exercise equipment based on the first inertia output and the second inertia output at the time of impact during the swing of the exercise equipment And an impact analysis unit for determining Thereby, the hitting position of the hit ball on the exercise equipment can be determined with a simple configuration.

  In the hit analysis device, the hit analysis unit determines a first hit position in a direction along the second axis from a predetermined position on the hitting surface based on the first inertia output at the time of the impact. Then, the second striking position in the direction along the first axis from the predetermined position may be determined based on the second inertia output at the time of the impact. Thereby, the hit | damage position of the vertical direction and horizontal direction from reference positions, such as a sweet spot of an exercise device, can be determined.

  In the hit analysis device, the hit analysis unit may determine the first hit position based on a change amount and a change direction of the first inertia output at the time of the impact. Thereby, the distance and direction from a 1st axis | shaft can be determined about a 1st striking position.

  In the above-described impact analysis device, the impact analysis unit may determine the second impact position based on an amount of change in unit time of the second inertia output at the time of the impact. Thereby, the distance and direction from a 2nd axis | shaft can be determined about a 2nd hit position.

  The storage unit that stores the characteristic information indicating the relationship between the characteristic of the first inertia output and the hitting position, and the characteristic information indicating the relationship between the characteristic of the second inertia output and the hitting position in the hitting analysis apparatus The impact analysis unit may determine the impact position at the impact based on the first inertia output and the second inertia output at the impact and the characteristic information. Thereby, it is possible to determine the hitting position with higher accuracy without performing complicated calculations.

  The hit analysis device may include an output unit that outputs the hit position. Thereby, it is possible to inform the user of the hitting position with a simple configuration.

  Another aspect of the present invention that solves the above-described problem is a hitting analysis apparatus, in which a first axis is an axis along the direction from the grip part to the hitting ball part of the exercise equipment, and the first hitting surface of the hitting ball part has the first When an axis along a direction orthogonal to one axis is a second axis, an acquisition unit that acquires an inertia output according to the rotation generated around the second axis, and at the time of impact during swing of the exercise equipment A striking analysis unit that determines a striking position or a striking state in the exercise equipment based on the inertia output. Thereby, it is possible to determine the hitting position or hitting state of the hit ball on the exercise equipment with a simple configuration.

  In the above-described impact analysis device, the impact analysis unit further includes a storage unit that stores property information indicating a relationship between the inertia output characteristic and the impact position or the impact state, and the impact analysis unit includes the inertia output at the time of the impact. And the hitting position or the hitting state at the time of impact may be determined based on the characteristic information. Thereby, it is possible to determine the hitting position or hitting state with higher accuracy without performing complicated calculations.

  The hit analysis apparatus may include an output unit that outputs the hit position or the hit state. Thereby, it is possible to inform the user of the hitting position or hitting state with a simple configuration.

  Still another aspect of the present invention that solves the above-described problem is a striking analysis system, in which a first axis is an axis along the direction from the grip portion to the hitting ball portion of the exercise equipment, and the hitting surface of the hitting ball portion is When the axis along the direction orthogonal to the first axis is the second axis, the first inertia output according to the rotation generated around the first axis and the rotation generated around the second axis An inertial sensor that outputs a second inertial output, an acquisition unit that acquires the first inertial output and the second inertial output, the first inertial output at the time of impact during the swing of the exercise equipment, and the second A striking analysis unit for determining a striking position in the exercise equipment based on an inertia output. Thereby, the hitting position of the hit ball on the exercise equipment can be determined with a simple configuration.

  Still another aspect of the present invention that solves the above-described problem is a hitting analysis method, in which a first axis is an axis along a direction from a grip part to a hitting ball part of the exercise equipment, and the hitting surface of the hitting ball part has the above-mentioned When the axis along the direction orthogonal to the first axis is the second axis, the step of obtaining the first inertia output according to the rotation generated around the first axis, and generated around the second axis Obtaining a second inertia output corresponding to the rotation to be performed, and determining a striking position on the exercise equipment based on the first inertia output and the second inertia output at the time of impact during the swing of the exercise equipment Including. Thereby, the hitting position of the hit ball on the exercise equipment can be determined by a simple method.

  Still another aspect of the present invention that solves the above problem is a program, in which a first axis is an axis along the direction from the grip part to the hitting part of the exercise equipment, and the first hitting surface of the hitting part is the first axis. When a second axis is an axis along a direction orthogonal to the axis, a procedure for obtaining a first inertia output according to a rotation generated around the first axis, and a rotation generated around the second axis And a procedure for obtaining a second inertia output according to the method, and a procedure for determining a striking position on the exercise equipment based on the first inertia output and the second inertia output at the time of impact during swing of the exercise equipment. Let the computer run. Thereby, the hitting position of the hit ball on the exercise equipment can be determined with a simple program.

It is a block diagram which shows an example of a structure of the impact analysis system which concerns on 1st embodiment of this invention. It is a figure which shows an example of the data structure of characteristic information. It is a flowchart which shows an example of a hit | damage analysis process. It is a figure which shows the example of the hit position in the swing of a tennis racket. It is a figure which shows the example of the angular velocity data around each axis of the period before and behind an impact. It is a figure which shows the example of the striking position in the swing of a baseball bat. It is a figure which shows the example of the hit position in the swing of a golf club. It is a figure which shows an example of the data structure of the characteristic information which concerns on 2nd embodiment of this invention.

<First embodiment>
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an example of the configuration of a batting analysis system according to the first embodiment of the present invention.

  The impact analysis system includes a sensor unit 1 and an impact analysis device 2. The sensor unit 1 and the impact analysis device 2 are connected by wire or wireless so that they can communicate with each other.

  The sensor unit 1 is attached to an exercise device (for example, a tennis racket, a baseball bat, a golf club, or the like) that is an object of impact analysis. As an inertial sensor, the sensor unit 1 can measure the acceleration generated in each of the three axes and the angular velocity generated around each of the three axes.

  The sensor unit 1 has, for example, one of three orthogonal detection axes (x-axis, y-axis, z-axis), for example, the z-axis, and the long axis of the exercise equipment (for example, the grip end of the tennis racket to the front end of the frame). (The axis along the direction from the grip end of the baseball bat to the tip, the axis along the shaft direction of the golf club). The sensor unit 1 is attached to the exercise equipment, for example, by aligning the other axis, for example, the y axis, with the direction of the central axis (swing axis) when the user swings the exercise equipment.

  The sensor unit 1 includes a control unit 10, a communication unit 11, an acceleration sensor 12, and an angular velocity sensor 13.

  The control unit 10 controls the sensor unit in an integrated manner. The control unit 10 receives acceleration data and angular velocity data from the acceleration sensor 12 and the angular velocity sensor 13, respectively, attaches time information, and stores them in a storage unit (not shown). The control unit 10 adds time information to the stored measurement data (acceleration data and angular velocity data), generates packet data that matches the communication format, and outputs the packet data to the communication unit 11.

  The communication unit 11 is connected to the impact analysis device 2 and transmits packet data received from the control unit 10 to the impact analysis device 2, processing that receives a control signal from the impact analysis device 2 and sends it to the control unit 10 and the like I do.

  The acceleration sensor 12 detects the acceleration in the detection axis direction, and outputs an output signal corresponding to the detected acceleration magnitude. In the present embodiment, the acceleration sensor detects accelerations in the directions of three axes (x axis, y axis, z axis).

  The angular velocity sensor 13 detects an angular velocity around the detection axis, and outputs an output signal corresponding to the detected angular velocity. In the present embodiment, the angular velocity sensor detects angular velocities around three axes (x axis, y axis, z axis).

  In the present embodiment, the sensor unit 1 may not include the acceleration sensor 12.

  The impact analysis device 2 includes a control unit 20, a communication unit 21, a storage unit 22, an operation unit 23, a display unit 24, and an audio output unit 25.

  The communication unit 21 is connected to the sensor unit 1 and receives sensor signals and transmits / receives control signals. The communication unit 21 can be realized by a network interface device, for example.

  The storage unit 22 stores data used by the control unit 10 for processing. The storage unit 22 can be realized by, for example, a nonvolatile storage device such as a flash ROM (Read Only Memory).

  The storage unit 22 stores characteristic information used to determine the ball hitting position on the exercise equipment. FIG. 2 is a diagram illustrating an example of a data structure of characteristic information. The characteristic information 220 includes a record in which the characteristic 222 at the hitting position is associated with each hitting position 221 in the exercise equipment.

  The striking position 221 is a striking position in the z-axis direction in the direction along the detection axis (z-axis) from a reference position (for example, a sweet spot, which corresponds to the predetermined position of the present invention) on the striking surface of the exercise equipment, or the motion It includes the y-axis direction striking position in the direction along the detection axis (y-axis) from the reference position on the ball striking surface of the instrument. The striking position 221 is not limited to a point position, and may be a surface position having a certain size.

  The characteristic 222 is a y-axis angular velocity characteristic that is assumed to occur when a hit is made at the hit position specified by the z-axis hit position, or a hit is specified at the hit position specified by the y-axis hit position. Including the z-axis angular velocity characteristics that are expected to occur in the The angular velocity characteristic may be a range that the angular velocity can take, a range that the angular velocity change can take, a change amount of the angular velocity within a unit time, or calculated based on the angular velocity. The range that the frequency can take may be used, and the index is not limited.

  In the present embodiment, the characteristic information 220 includes a record in which the y-axis striking position and the z-axis angular velocity characteristic are associated (hereinafter referred to as “z-axis record”), the z-axis striking position, and the y-axis angular velocity characteristic. Are associated with each other (hereinafter referred to as “y-axis record”). “***” in the figure indicates that a value is set, and “−” indicates that a value is not set.

  Returning to the description of FIG. The operation unit 23 receives a user operation input and outputs an operation signal corresponding to the operation to the control unit 20. The operation unit 23 can be realized by an input device such as a key, a touch sensor, or a touch panel, for example.

  The display unit 24 displays a screen. The display unit 24 can be realized by, for example, an LCD (Liquid Crystal Display), an organic EL (Electro-Luminescence) display, or the like.

  The audio output unit 25 outputs audio. The audio output unit 25 can be realized by, for example, a speaker or a buzzer.

  The control unit 20 controls the batting analysis device 2 in an integrated manner. The control unit 20 includes a data acquisition unit (corresponding to a first acquisition unit and a second acquisition unit of the present invention) 200, an impact detection unit 201, an impact analysis unit 202, and an output processing unit (an output unit of the present invention). 203).

  For example, the control unit 20 connects a CPU (Central Processing Unit) that is an arithmetic device, a RAM (Random Access Memory) that is a volatile storage device, a ROM that is a nonvolatile storage device, and the control unit 20 and other units. It can be realized by a computer provided with an interface (I / F) circuit to be connected, a bus for connecting these to each other, and the like. The computer may include various dedicated processing circuits such as an image processing circuit. The control unit 20 may be realized by an ASIC (Application Specific Integrated Circuit) or the like.

  At least some of the functions of the control unit 20 (the data acquisition unit 200, the impact detection unit 201, the impact analysis unit 202, and the output processing unit 203), for example, the CPU reads a predetermined program stored in the ROM into the RAM It can be realized by executing. The predetermined program is, for example, an application program that runs on an OS (Operating System), which is read from a portable storage medium and installed in the impact analysis device 2 or downloaded from a server on the network and the impact analysis device 2. Or can be installed. Of course, at least a part of the functions of the control unit 20 may be realized by, for example, a dedicated processing circuit. Further, at least a part of the function of the control unit 20 may be realized by both the CPU and the dedicated processing circuit, for example.

  The data acquisition unit 200 acquires measurement data from the sensor unit 1 via the communication unit 21. In this embodiment, the data acquisition unit 200 includes at least an angular velocity (corresponding to the first inertia output of the present invention) about the z axis (corresponding to the first axis of the present invention) and a y axis (second axis of the present invention). ) (Corresponding to the second inertia output of the present invention). The data acquisition unit 200 acquires measurement data at a predetermined sampling cycle, for example. The acquired data is stored in a storage device such as the RAM or the storage unit 22, for example.

  The impact detection unit 201 detects the impact timing in the swing of the exercise equipment based on the measurement data.

  The hit analysis unit 202 determines the hit position of the hit ball on the exercise equipment at the timing of impact based on the measurement data and the characteristic information 220.

  The output processing unit 203 generates a screen indicating the hit position determined by the hit analysis unit 202, and outputs and displays the screen on the display unit 24. The output processing unit 203 outputs the generated screen to an external device such as a PC (Personal Computer), a tablet PC, a smartphone, or an HMD (Head Mount Display) via a communication unit (not shown) included in the impact analysis device 2. It may be output to the device and displayed. Further, the output processing unit 203 may generate a sound indicating the hitting position and output the sound to the sound output unit 25 to output the sound.

  FIG. 3 is a flowchart illustrating an example of the impact analysis process.

  First, the data acquisition unit 200 acquires measurement data (step S10). For example, the data acquisition unit 200 acquires angular velocity data from the sensor unit 1 via the communication unit 21 for a predetermined period. The predetermined period is a period including at least before and after the impact, for example, a period from the start to the end of the swing.

  Then, the impact detection unit 201 detects an impact (step S20). For example, the impact detection unit 201 specifies the timing at which the magnitude of the absolute value of the angular velocity around the y-axis (swing axis) is maximized based on the angular velocity data obtained in step S10 for a predetermined period, and determines this timing. Detect as impact timing. In general, the absolute value of the angular velocity around the y-axis (swing axis) increases from the start of the swing to the moment of impact and decreases immediately after the impact. Accordingly, in the present embodiment, the timing at which the absolute value of the angular velocity around the y-axis (swing axis) is maximized is treated as the impact timing.

  Then, the hit analysis unit 202 determines the hit position in the y-axis direction based on the angular velocity around the z-axis (step S30). For example, the batting analysis unit 202 calculates the angular velocity characteristic around the z axis for a predetermined period from the impact timing detected in step S20, based on the angular velocity data acquired in step S10. Further, the hit analysis unit 202 refers to the z-axis record (the z-axis angular velocity characteristic of the characteristic 222) in the characteristic information 220, and identifies the z-axis record including the calculated z-axis angular velocity characteristic. In this way, the impact analysis unit 202 can determine the impact position 221 (y-axis direction impact position (corresponding to the first impact position of the present invention)).

  Then, the hit analysis unit 202 determines the hit position in the z-axis direction based on the angular velocity around the y-axis (step S40). For example, the batting analysis unit 202 calculates the angular velocity characteristic around the y-axis for a predetermined period from the impact timing detected in step S20, based on the angular velocity data acquired in step S10. Further, the batting analysis unit 202 refers to the y-axis record (the y-axis angular velocity characteristic of the characteristic 222) in the characteristic information 220, and identifies the y-axis record including the calculated y-axis angular velocity characteristic. In this way, the impact analysis unit 202 can determine the impact position 221 (z-axis direction impact position (corresponding to the second impact position of the present invention)).

  Then, the impact analysis unit 202 records the impact position (step S50). For example, the hit analysis unit 202 acquires the hit position in the y-axis direction and the hit position in the z-axis direction from the hit position 221 of the record specified in steps S30 and S40, and associates it with the identifier (for example, date and time) of this swing. And stored in the storage unit 22. The hit analysis unit 202 transmits the swing identifier, the y-axis direction hit position, and the z-axis direction hit position to an external device via a communication unit (not shown) provided in the hit analysis device 2 or the like. It may be recorded.

  For example, the output processing unit 203 generates a screen indicating the hitting position related to the exercise device of the specified swing based on the hitting position related to the exercise device of each swing stored in the storage unit 22, and displays the screen on the display unit 24. Output and display.

  Next, an example of determining the hitting position of the tennis racket will be specifically described.

  FIG. 4 is a diagram illustrating an example of a hitting position in a swing of a tennis racket. In FIG. 4, a sweet spot of the tennis racket 5 (intersection of two alternate long and short dashed lines in the figure) is shown.

  The sensor unit 1 has the x-axis of the hitting portion of the tennis racket 5 so that the z-axis of the three detection axes is along the long axis of the tennis racket 5 (the direction from the grip portion to the tip of the hitting ball portion (frame)). It is attached to the grip end so that the y-axis is along an axis (swing axis) parallel to the hitting surface so as to be along an axis orthogonal to the hitting surface (face surface). Of course, the mounting position of the sensor unit 1 is not limited to the illustrated position.

  FIG. 4A shows a case where the ball is hit with a sweet spot. In this case, almost no rotation of the tennis racket 5 around the z-axis occurs immediately after impact. FIG. 4B shows a case where the ball is hit at a position shifted in the vertical direction (y-axis direction) from the sweet spot. In this case, immediately after the impact, rotation of the tennis racket 5 around the z-axis (arrow in FIG. 4B) occurs. Here, the rotation direction around the z-axis differs depending on whether the hitting position is located above or below in the vertical direction with respect to the sweet spot (or horizontal one-dot chain line). Further, the magnitude of the rotational moment (angular velocity) generated by the striking varies depending on the vertical distance from the sweet spot (or the alternate long and short dash line in the lateral direction) of the striking position.

  Therefore, for example, the amount of change in the angular velocity around the z-axis (including positive and negative information) for a predetermined period from the impact and the hit position in the y-axis direction at that time are converted into data as characteristic information 220 in advance. The striking position in the y-axis direction can be determined from the measured change amount of the angular velocity around the z-axis. For example, the maximum value (including positive / negative information) of the angular velocity around the z-axis for a predetermined period from the impact and the hit position in the y-axis direction at that time are converted into data as characteristic information 220 in advance and measured. The hit position in the y-axis direction may be determined from the maximum value of the z-axis angular velocity.

  FIG. 4C shows a case where the ball is hit at a position shifted from the sweet spot in the lateral direction (z-axis direction). In general, the absolute value of the angular velocity around the y-axis (swing axis) increases from the start of the swing to the moment of impact and decreases immediately after the impact.

  Here, generally, when a ball is hit with a sweet spot, the impact is caused by the ball at a position deviating from the sweet spot (or vertical one-dot chain line) in the z-axis direction (the racket tip side or grip side of the face surface). It is smaller than the impact when hit. In addition, it is considered that the impact when hitting the ball on the racket tip side of the face surface is larger than the impact when hitting the ball on the grip side of the face surface. This is presumably because the force of hitting the ball becomes weaker as the hitting position is farther from the swing axis that is the fulcrum of the swing.

  From this, the absolute value of the angular velocity around the y-axis (swing axis) in a predetermined period immediately after the impact is z from the sweet spot (or vertical one-dot chain line) than when the ball is hit with the sweet spot on the face surface. It is considered that the amount of change (degree of deceleration) within a unit time is larger when the ball is hit at a position deviated in the axial direction. In addition, the absolute value of the angular velocity around the y-axis (swing axis) in a predetermined period immediately after impact is greater when the ball is hit on the front side of the racket than on the grip side of the face side. However, it is considered that the amount of change (degree of deceleration) within the unit time is large.

  Therefore, for example, the amount of change in the absolute value of the angular velocity around the y-axis for a predetermined period from the impact within the unit time and the hit position in the z-axis direction at that time can be converted into data as the characteristic information 220 in advance. The striking position in the z-axis direction can be determined from the amount of change in the measured angular velocity around the y-axis within a unit time.

  FIG. 5 is a diagram illustrating an example of angular velocity data around each axis during a period before and after the impact. FIG. 5 shows a case where the ball is hit at a position shifted in the vertical direction (y-axis direction) from the sweet spot.

  The time t0 at which the absolute value of the angular velocity around the y-axis is maximized is the impact timing. Further, immediately after the impact, the angular velocity around the z-axis changes greatly. Accordingly, by calculating the maximum change amount ΔH of the angular velocity around the z-axis and the change direction (positive / negative) in a predetermined period T1 (corresponding to the impact of the present invention) from time t0 to time t1, the characteristic information 220 is used. The striking position in the y-axis direction can be determined.

  On the other hand, in FIG. 5, the angular velocity about the y-axis increases until the moment of impact and changes greatly immediately after the impact. As described above, the gradient of the change in angular velocity around the y-axis (change amount within a unit time) in a predetermined period T2 (corresponding to the impact of the present invention) from time t0 to time t2 when the change converges is as described above. It differs depending on the hit position in the z-axis direction from the spot. For example, the inclination of the change in angular velocity about the y axis is smaller when the ball is hit on the grip side of the face surface than when the ball is hit on the racket tip side of the face surface. Therefore, by calculating the inclination of the angular velocity within the unit time around the y-axis in a predetermined period T2 (corresponding to the impact of the present invention) from time t0 to time t2, the striking position in the z-axis direction can be obtained from the characteristic information 220. Can be determined.

  Note that the length of the predetermined period T2 (the width of the waveform) can be considered to vary depending on the striking position in the z-axis direction from the sweet spot. Therefore, the width of the predetermined period T2 from the impact and the hit position in the z-axis direction at that time are converted into data as the characteristic information 220 in advance, so that the measured angular velocity around the y-axis can be obtained from the width of the predetermined period T2. The striking position in the z-axis direction can be determined.

  Next, an example of determining the hitting position of the baseball bat will be specifically described.

  FIG. 6 is a diagram illustrating an example of the hitting position in the swing of the baseball bat. In FIG. 6, the sweet spot of the baseball bat 6 (the intersection of two perpendicular one-dot chain lines in the figure) is shown.

  The sensor unit 1 has a baseball bat striking direction (hitting ball hitting portion) so that the z-axis of the three detection axes is along the long axis of the baseball bat 6 (direction from the grip portion to the tip of the hitting ball portion). The y-axis is attached to the grip end so as to be along the direction (axis parallel to the hitting surface, swing axis) perpendicular to the hitting direction of the baseball bat 6 so as to be along the axis orthogonal to the surface. Of course, the mounting position of the sensor unit 1 is not limited to the illustrated position.

  FIG. 6A shows a case where the ball is hit with a sweet spot. In this case, almost no rotation of the baseball bat 6 around the z axis occurs immediately after impact. FIG. 6B shows a case where the ball is hit at a position shifted in the vertical direction (y-axis direction) from the sweet spot. In this case, immediately after the impact, rotation of the baseball bat 6 around the z-axis (arrow in FIG. 6B) occurs. Here, the rotation direction around the z-axis differs depending on whether the hitting position is located above or below in the vertical direction with respect to the sweet spot (or horizontal one-dot chain line). Further, the magnitude of the rotational moment (angular velocity) generated by the striking varies depending on the vertical distance from the sweet spot (or the alternate long and short dash line in the lateral direction) of the striking position.

  Therefore, as in the case of the tennis racket 5, the baseball bat 6 also includes, for example, the amount of change in angular velocity (including positive / negative information) around the z-axis for a predetermined period from the impact, and the hit position in the y-axis direction at that time. Is converted into data as the characteristic information 220 in advance, so that the striking position in the y-axis direction can be determined from the measured change amount of the angular velocity around the z-axis. For example, the maximum value (including positive / negative information) of the angular velocity around the z-axis for a predetermined period from the impact and the hit position in the y-axis direction at that time are converted into data as characteristic information 220 in advance and measured. The hit position in the y-axis direction may be determined from the maximum value of the z-axis angular velocity.

  FIG. 6C shows a case where the ball is hit at a position shifted from the sweet spot in the lateral direction (z-axis direction). In general, the absolute value of the angular velocity around the y-axis (swing axis) increases from the start of the swing to the moment of impact and decreases immediately after the impact.

  Here, generally, when a ball is hit with a sweet spot, the impact is applied to the ball at a position deviating from the sweet spot (or vertical one-dot chain line) in the z-axis direction (the tip side or the grip side of the baseball bat 6). It is smaller than the impact when hit. Further, it is considered that the impact when the ball is hit on the tip side of the baseball bat 6 is larger than the impact when the ball is hit on the grip side. This is presumably because the force of hitting the ball becomes weaker as the hitting position is farther from the swing axis that is the fulcrum of the swing.

  From this, the absolute value of the angular velocity around the y-axis (swing axis) in a predetermined period immediately after the impact is more from the sweet spot (or vertical one-dot chain line) than when the ball is hit with the sweet spot of the baseball bat 6. The amount of change (degree of deceleration) within a unit time is considered to be greater when the ball is hit at a position deviating in the z-axis direction. In addition, the absolute value of the angular velocity around the y-axis (swing axis) in a predetermined period immediately after the impact is greater when the ball is hit on the tip side of the baseball bat 6 than when the ball is hit on the grip side of the baseball bat 6. It is considered that the amount of change (degree of deceleration) within the unit time is larger.

  Therefore, as in the case of the tennis racket 5, in the baseball bat 6, for example, the amount of change in the absolute value of the angular velocity around the y-axis during a predetermined period from the impact and the hit position in the z-axis direction at that time Is previously converted into data as the characteristic information 220, so that the striking position in the z-axis direction can be determined from the amount of change in the measured angular velocity around the y-axis within a unit time.

  Next, an example of determining the hit position of the golf club will be specifically described.

  FIG. 7 is a diagram illustrating an example of a hitting position in a swing of a golf club. In FIG. 7, a sweet spot of the golf club 7 (intersection of two alternate long and short dashed lines in the figure) is shown.

  The sensor unit 1 has the x-axis of the golf club 7 in the direction of hitting the ball (the hitting ball portion) so that the z-axis of the three detection axes is along the center axis (vertical dashed line) of the head (ball hitting portion) of the golf club 7. The y-axis is attached to the head so as to be along a direction (axis parallel to the ball striking surface) perpendicular to the ball striking direction of the golf club 7 so as to be along the ball striking ball orthogonal axis.

  Of course, the mounting position of the sensor unit 1 is not limited to the illustrated position. For example, in the sensor unit 1, the x-axis is the direction in which the golf club 7 is hit (the direction of the hitting portion) so that the z-axis is along the long axis of the golf club 7 (the direction from the grip portion to the hitting portion (head), the shaft axis). It may be attached to the shaft of the golf club 7 so that the y-axis is along an axis parallel to the hitting surface (swing axis) along the axis orthogonal to the hitting surface. In this case as well, the z axis may correspond to the center axis (vertical one-dot chain line) of the head, and the y axis may correspond to the head hitting direction and the axis (horizontal one-dot chain line) orthogonal to the central axis.

  FIG. 7A shows a case where the ball is hit with a sweet spot. In this case, almost no rotation of the head around the z-axis occurs immediately after impact. FIG. 7B shows a case where the ball is hit at a position shifted from the sweet spot in the lateral direction (y-axis direction). In this case, immediately after the impact, rotation of the head around the z-axis (arrow in FIG. 7B) occurs. Here, the rotation direction around the z-axis differs depending on whether the hitting position is located on the left or right side in the horizontal direction with respect to the sweet spot (or vertical one-dot chain line). In addition, the magnitude of the rotational moment (angular velocity) generated by the striking varies depending on the lateral distance from the sweet spot (or vertical one-dot chain line) of the striking position.

  Therefore, as in the case of the tennis racket 5, the golf club 7 also includes, for example, the amount of change in angular velocity around the z axis for a predetermined period from the impact (including positive / negative information) and the hit position in the y axis direction at that time. Is converted into data as the characteristic information 220 in advance, so that the striking position in the y-axis direction can be determined from the measured change amount of the angular velocity around the z-axis. For example, the maximum value (including positive / negative information) of the angular velocity around the z-axis for a predetermined period from the impact and the hit position in the y-axis direction at that time are converted into data as characteristic information 220 in advance and measured. The hit position in the y-axis direction may be determined from the maximum value of the z-axis angular velocity.

  FIG. 7C shows a case where the ball is hit at a position shifted in the vertical direction (z-axis direction) from the sweet spot. In general, the absolute value of the angular velocity around the y-axis (swing axis) increases from the start of the swing to the moment of impact and decreases immediately after the impact.

  Here, generally, when a ball is hit with a sweet spot, the impact is when the ball is hit at a position deviating from the sweet spot in the z-axis direction (when hitting the head of the ball or hitting the ground). It is considered to be smaller than the impact. Further, it is considered that the impact when the ball is hit on the lower side of the club head is smaller than the impact when the ball is hit on the upper side of the club head. This is because hitting the ball above the club head means hitting the ground.

  From this, the absolute value of the angular velocity around the y-axis (swing axis) in a predetermined period immediately after the impact is from the sweet spot (or a horizontal alternate long and short dash line) than when the ball is hit with the sweet spot of the golf club 7. The amount of change (degree of deceleration) within a unit time is considered to be greater when the ball is hit at a position deviating in the z-axis direction. Further, the absolute value of the angular velocity around the y-axis (swing axis) in a predetermined period immediately after impact is greater when the ball is hit on the upper side of the club head than when the ball is hit on the lower side of the club head. It is considered that the amount of change (degree of deceleration) within the unit time is large.

  Accordingly, as in the case of the tennis racket 5, in the golf club 7, for example, the amount of change in unit time of the absolute value of the angular velocity around the y-axis for a predetermined period from the impact, and the hit position in the z-axis direction at that time Is previously converted into data as the characteristic information 220, so that the striking position in the z-axis direction can be determined from the amount of change in the measured angular velocity around the y-axis within a unit time.

  The first embodiment of the present invention has been described above. According to this embodiment, for example, based on the angular velocity around the first axis along the major axis of the exercise equipment and the angular velocity around the axis along the second axis perpendicular to the major axis, the hit ball on the exercise equipment The hit position is determined. Thereby, a striking position can be determined with a simple configuration.

  Further, according to the present embodiment, for example, based on the angular velocity around the first axis along the long axis of the exercise apparatus, the hit position in the direction along the second axis orthogonal to the long axis is determined, and the second Based on the angular velocity around the axis, the striking position in the direction along the first axis is determined. Thereby, the hit | damage position of the vertical direction and horizontal direction from reference positions, such as a sweet spot of an exercise device, can be determined.

  Further, according to the present embodiment, for example, the striking position in the direction along the second axis is determined based on the change amount and change direction of the angular velocity around the first axis. Thereby, the distance and direction from the 1st axis | shaft of a striking position can be determined.

  Further, according to the present embodiment, for example, the striking position in the direction along the first axis is determined based on the amount of change of the angular velocity around the second axis within the unit time. Thereby, the distance and direction from the 2nd axis | shaft of a striking position can be determined.

  Further, according to the present embodiment, for example, characteristic information that associates the striking position with the angular velocity characteristic is stored, and the striking position is determined based on the measurement data and the characteristic information. Thereby, it is possible to determine the hitting position with higher accuracy without performing complicated calculations.

  In the first embodiment, the two detection axes of the sensor unit have been described as corresponding to the two axes (long axis and swing axis) of the exercise apparatus. However, depending on the mounting position and mounting angle of the sensor unit 1 Sometimes not. In such a case, the deviation between the detection axis and the axis of the exercise apparatus may be corrected by using a correction parameter or the like created in advance.

<Second embodiment>
In the first embodiment, the hit analysis device 2 determines the hit position of the hit ball on the exercise instrument, but in the second embodiment, the hit analysis device 2 determines the hit state of the hit ball on the exercise instrument.

  The configuration of the impact analysis device 2 is basically the same as that of the first embodiment, except for the following points.

  The storage unit 22 stores characteristic information used for determining the hit state of the ball in the exercise equipment. FIG. 8 is a diagram showing an example of a data structure of characteristic information according to the second embodiment of the present invention. The characteristic information 220 </ b> A includes a record in which the characteristic 224 in the hit state is associated with each hit state 223 in the exercise equipment.

  The hit state 223 is, for example, how to hit the ball against the exercise equipment, how to hit the ball, or the like. Specifically, for example, in tennis, it is slice, drive, etc., and in golf, it is slice, hook, etc.

  The characteristic 224 includes a y-axis angular velocity characteristic that is assumed to be generated when the hit state 223 is hit, or a z-axis angular speed characteristic that is assumed to be generated when the hit state 223 is hit. The angular velocity characteristic may be a range that the angular velocity can take, a range that the angular velocity change can take, a change amount of the angular velocity within a unit time, or calculated based on the angular velocity. The range that the frequency can take may be used, and the index is not limited.

  In the present embodiment, the characteristic information 220A is associated with a record in which the hit state 223 and the z-axis angular velocity characteristic are associated (hereinafter, referred to as “z-axis record”), and the hit state 223 and the y-axis angular velocity characteristic. Records (hereinafter referred to as “y-axis records”). “***” in the figure indicates that a value is set, and “−” indicates that a value is not set.

  Angular velocity characteristics (size, change, positive / negative, change slope, etc.) around the y-axis and angular velocity characteristics (size, change, positive / negative, change slope, etc.) around the z-axis depend on the striking state of the hit ball. Considered different. Therefore, for example, by measuring the angular velocity characteristics around the y axis and the z axis for a predetermined period from the impact and the hit state at that time as the characteristic information 220A in advance, the measured angular velocity around the z axis and the y axis The striking state can be determined from the turning angular velocity.

  The hit analysis unit 202 determines the hit state of the hit ball on the exercise equipment at the timing of impact based on the measurement data and the characteristic information 220A. That is, the hit analysis unit 202 refers to the z-axis record (the z-axis angular velocity characteristic of the characteristic 224) in the characteristic information 220A, and identifies the z-axis record that includes the calculated z-axis angular velocity characteristic. Further, the hit analysis unit 202 refers to the y-axis record (y-axis angular velocity characteristic of the characteristic 224) in the characteristic information 220A, and identifies the y-axis record including the calculated y-axis angular velocity characteristic. In this way, the hit analysis unit 202 can determine the hit state 223.

  The output processing unit 203 generates a screen indicating the hit state determined by the hit analysis unit 202, and outputs and displays the screen on the display unit 24. The output processing unit 203 may output the generated screen to an external device via a communication unit (not shown) included in the batting analysis device 2 and display the screen. Further, the output processing unit 203 may generate a sound indicating the hit state and output the sound to the sound output unit 25 to output the sound.

  The second embodiment of the present invention has been described above. According to the present embodiment, for example, based on the angular velocity around the axis along the long axis of the exercise equipment and the angular velocity around the axis along the axis orthogonal to the long axis, the hit state of the hit ball on the exercise equipment is determined. judge. Thereby, a striking state can be determined with a simple configuration.

  Further, according to the present embodiment, for example, characteristic information that associates the striking state with the angular velocity characteristic is stored, and the striking state is determined based on the measurement data and the characteristic information. Thereby, it is possible to determine the hit state with higher accuracy without performing a complicated calculation.

  In addition, combining the first embodiment and the second embodiment, the batting analysis device 2 may determine both the batting position and the batting state.

  The present invention is not limited to the above-described embodiments, and can be implemented in various modes without departing from the scope of the invention. For example, the following modifications may be added to the above embodiments. Moreover, you may combine 2 or more suitably for each embodiment and each modification.

  In the first embodiment described above, one hitting position (y-axis direction or z-axis direction) is determined based on the angular velocity characteristics around one detection axis (z-axis or y-axis). Two hit positions (y-axis direction and z-axis direction) may be determined based on angular velocity characteristics around (z-axis and y-axis). In this case, in each record of the characteristic information 220, values are set for all of the z-axis hit position, the y-axis hit position, the y-axis angular velocity characteristic, and the z-axis angular velocity characteristic. In this way, a finer hitting position can be determined according to the combination conditions of the angular velocity characteristics around the two detection axes (z axis and y axis).

  In the second embodiment described above, one striking state is determined based on the angular velocity characteristics around one detection axis (z axis or y axis), but around two detection axes (z axis and y axis). One striking state may be determined based on the angular velocity characteristics. In this case, in each record of the characteristic information 220A, values are set for all of the hit state, the y-axis angular velocity characteristic, and the z-axis angular velocity characteristic. In this way, it is possible to determine a finer hitting state according to the combination conditions of the angular velocity characteristics around the two detection axes (z axis and y axis).

  In each of the above-described embodiments, at least some of the functions of the data acquisition unit 200, the impact detection unit 201, the impact analysis unit 202, and the output processing unit 203 are realized by the control unit 10 of the sensor unit 1. Also good. Further, the sensor unit 1 may be provided with an output unit such as a display unit, an audio output unit, and a light emitting unit, and the hitting position or hitting state may be output from the output unit.

  The configuration of the impact analysis system shown in FIG. 1 is classified according to the main processing contents in order to facilitate understanding of the configuration of the impact analysis system. The present invention is not limited by the way of classification and names of the constituent elements. The configuration of the impact analysis system can be classified into more components depending on the processing content. Moreover, it can also classify | categorize so that one component may perform more processes. Further, the processing of each component may be executed by one hardware or may be executed by a plurality of hardware. Further, the processing or function sharing of each component is not limited to the above as long as the object and effect of the present invention can be achieved. For example, in the above embodiment, the sensor unit 1 and the impact analysis device 2 have been described as separate bodies. However, the function of the impact analysis device 2 may be mounted on the sensor unit 1 or vice versa.

  Further, the processing unit of the flowchart shown in FIG. 3 is divided according to the main processing contents in order to facilitate understanding of the processing of the impact analysis device 2. The present invention is not limited by the way of dividing the processing unit or the name. The processing of the impact analysis device 2 can be divided into more processing units according to the processing content. Moreover, it can also divide | segment so that one process unit may contain many processes. Further, the processing order of the above flowchart is not limited to the illustrated example.

  The present invention is not limited to the illustrated tennis, baseball, and golf, but can be applied to exercises that swing exercise equipment such as badminton.

1: sensor unit, 2: hitting analysis device, 5: tennis racket, 6: baseball bat, 7: golf club, 10: control unit, 11: communication unit, 12: acceleration sensor, 13: angular velocity sensor, 20: control unit , 21: communication unit, 22: storage unit, 23: operation unit, 24: display unit, 25: audio output unit, 200: data acquisition unit, 201: impact detection unit, 202: impact analysis unit, 203: output processing unit , 220: characteristic information, 220A: characteristic information, 221: hitting position, 222: characteristic, 223: hitting state, 224: characteristic

Claims (12)

When the axis along the direction from the grip part of the exercise device to the hitting ball part is the first axis, and the axis along the direction orthogonal to the first axis in the hitting surface of the hitting ball part is the second axis,
A first acquisition unit for acquiring a first inertia output according to the rotation generated around the first axis;
A second acquisition unit for acquiring a second inertia output according to the rotation generated around the second axis;
A striking analysis device comprising: a striking analysis unit that determines a striking position on the sports equipment based on the first inertia output and the second inertia output at the time of impact during swing of the sports equipment. The impact analysis device according to claim 1,
The impact analysis unit
Based on the first inertia output at the time of impact, a first striking position in a direction along the second axis from a predetermined position on the striking surface is determined,
A striking analysis device that determines a second striking position in a direction along the first axis from the predetermined position based on the second inertia output at the time of impact. The impact analysis device according to claim 2,
The impact analysis unit is an impact analysis device that determines the first impact position based on a change amount and a change direction of the first inertia output at the time of impact. The impact analysis device according to claim 2 or 3,
The impact analysis unit is an impact analysis device that determines the second impact position based on an amount of change of the second inertia output during the impact within a unit time. The impact analysis device according to any one of claims 1 to 4,
A storage unit for storing characteristic information indicating a relationship between the characteristic of the first inertia output and the striking position, and characteristic information indicating a relationship between the characteristic of the second inertia output and the striking position;
The impact analysis unit determines the impact position at the time of impact based on the first inertia output and the second inertia output at the time of impact and the characteristic information. The impact analysis device according to any one of claims 1 to 5,
A batting analysis device having an output unit for outputting the batting position. When the axis along the direction from the grip part of the exercise device to the hitting ball part is the first axis, and the axis along the direction orthogonal to the first axis in the hitting surface of the hitting ball part is the second axis,
An acquisition unit for acquiring an inertia output according to the rotation generated around the second axis;
A striking analysis device comprising: a striking analysis unit that determines a striking position or striking state of the sports equipment based on the inertia output at the time of impact during swing of the sports equipment. The impact analysis device according to claim 7,
A storage unit that stores characteristic information indicating a relationship between the characteristic of the inertia output and the hitting position or the hitting state;
The batting analysis unit is configured to determine the batting position or the batting state at the time of impact based on the inertia output at the time of impact and the characteristic information. The impact analysis device according to claim 7 or 8,
A batting analysis device having an output unit for outputting the batting position or the batting state. When the axis along the direction from the grip part of the exercise device to the hitting ball part is the first axis, and the axis along the direction orthogonal to the first axis in the hitting surface of the hitting ball part is the second axis,
An inertial sensor that outputs a first inertia output according to the rotation generated around the first axis and a second inertia output according to the rotation generated around the second axis;
An acquisition unit for acquiring the first inertia output and the second inertia output;
A striking analysis system comprising: a striking analysis unit that determines a striking position on the sports equipment based on the first inertia output and the second inertia output at the time of impact during swing of the sports equipment. When the axis along the direction from the grip part of the exercise device to the hitting ball part is the first axis, and the axis along the direction orthogonal to the first axis in the hitting surface of the hitting ball part is the second axis,
Obtaining a first inertial output in response to rotation occurring about the first axis;
Obtaining a second inertia output in response to rotation occurring about the second axis;
A striking analysis method including a step of determining a striking position in the exercise equipment based on the first inertia output and the second inertia output at the time of impact during swing of the exercise equipment. When the axis along the direction from the grip part of the exercise device to the hitting ball part is the first axis, and the axis along the direction orthogonal to the first axis in the hitting surface of the hitting ball part is the second axis,
Obtaining a first inertial output in response to rotation occurring about the first axis;
Obtaining a second inertia output in response to rotation occurring around the second axis;
A program for causing a computer to execute a procedure for determining a striking position on the exercise equipment based on the first inertia output and the second inertia output at the time of impact during swing of the exercise equipment.

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