JP2016198296A - Evaluation device and evaluation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device that can easily determine a shaft having rigidity adapted to a user himself/herself when selecting a golf club.SOLUTION: A golf swing analysis device for evaluating rigidity of a shaft of a golf club includes: an interface for receiving motion information of the golf club in swing motion from an inertial sensor 12; a bending moment analysis unit 35 for analyzing inertial force generated in the shaft by the swing motion on the basis of the motion information; and an image generation unit 36 for evaluating the rigidity of the shaft on the basis of an analyzed result. The bending moment analysis unit 35 calculates a component of a first direction along the direction of the shaft acting on the shaft in switching action from top swing to down swing, during which the direction of the swing motion is switched, and a component of a second direction perpendicular to the first direction. The image generation unit 36 evaluates the rigidity of the shaft on the basis of the component of first direction and the component of the second direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an evaluation apparatus and an evaluation system.

As is well known, the trajectory of a hit ball in golf greatly depends on the orientation of the face of the golf club at the time of impact. The orientation of the face is affected by the deflection of the shaft during the swing. The shaft stiffness distribution is affected by the shaft stiffness distribution. Therefore, if the deflection of the shaft during the swing is accurately analyzed, the swing suitable for the golfer can be performed.
For example, as disclosed in Patent Document 1, a method is disclosed in which a three-axis acceleration sensor and a three-axis gyro sensor are mounted on a golf club, and a swing motion is measured based on outputs of these inertial sensors. According to the method of Patent Literature 1, swing analysis can be easily performed.

JP 2008-73210 A

  However, although the swing can be analyzed by the above-described method, it has not been possible to determine whether or not the rigidity of the used golf club shaft is suitable for the golfer. Therefore, it is necessary for the golfer to perform trial hitting with a shaft having various rigidity at a golf shop or the like, and to determine a suitable rigidity in accordance with the advice of an expert. As described above, when selecting a golf club, it takes time and effort to determine a shaft having rigidity suitable for itself.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1]
An evaluation apparatus according to this application example is an evaluation apparatus that evaluates the rigidity of a shaft of an exercise instrument, and based on the exercise information, a communication unit that receives exercise information of the exercise instrument in a swing exercise from a sensor unit, and An analysis unit that analyzes an inertial force generated in the shaft by the swing motion; and an evaluation unit that evaluates rigidity of the shaft based on a result of analysis by the analysis unit, the analysis unit including the swing motion Calculating a component in a first direction along the direction of the shaft and a component in a second direction orthogonal to the first direction, which acts on the shaft in a turning operation in which the direction of The unit is characterized in that the rigidity of the shaft is evaluated based on the component in the first direction and the component in the second direction.

  According to such a configuration, when an exercise device having a shaft performs a swing motion, the inertial force acting on the shaft in the reversing operation in which the swing direction is switched is calculated based on the motion information detected by the sensor unit, The first direction component indicating the direction and the second direction component orthogonal to the first direction are calculated and divided into the first direction component and the second direction component. Based on this, the characteristics related to the rigidity of the shaft are evaluated. Therefore, the evaluation apparatus can easily and quickly evaluate the characteristics relating to the rigidity of the shaft in the exercise apparatus based on the orthogonal direction component of the inertial force acting on the shaft.

[Application Example 2]
In the evaluation device according to the application example, it is preferable that the evaluation unit evaluates the rigidity of the shaft based on a ratio of a component in the first direction and a component in the second direction.

  According to such a configuration, the rigidity of the shaft can be evaluated based on the ratio of the two direction components orthogonal to each other.

[Application Example 3]
In the evaluation apparatus according to the application example, it is preferable that the analysis unit calculates at least one of a bending moment and a torque that act on the shaft by the inertial force.

  According to such a configuration, it is possible to calculate at least one of a bending moment and a torque acting on the shaft based on the inertia force.

[Application Example 4]
In the evaluation apparatus according to the application example, the second direction is at least one of a moving direction in which the shaft is moved by the swing motion, and a normal direction orthogonal to the moving direction and the first direction. It may be one.

[Application Example 5]
In the evaluation device according to the application example, it is preferable that the evaluation unit generates an image for displaying the component in the first direction and the component in the second direction by coordinates.

  According to such a configuration, the coordinates in which the ratio between the component in the first direction and the component in the second direction is associated with the component in the first direction and the component in the second direction are generated as an image. Therefore, information according to the rigidity of the shaft can be visually shown.

[Application Example 6]
In the evaluation apparatus according to the application example described above, it is preferable that the exercise apparatus is a golf club, and the turn-back operation is an operation until the golf club transitions from a halfway back state to an impact state.

  According to such a structure, the characteristic regarding the rigidity of a shaft can be evaluated in the operation | movement until it changes to the state of an impact from the state of a halfway back of a golf club.

[Application Example 7]
In the evaluation device according to the application example, it is preferable that the evaluation unit generates information on the shaft of the golf club suitable for a user based on the component in the first direction and the component in the second direction. .

  According to such a configuration, it is possible to generate golf club shaft information suitable for the user based on the component in the first direction and the component in the second direction.

[Application Example 8]
An evaluation system according to this application example is an evaluation system in which a detection device and an information processing device are communicably connected to each other, and evaluates the rigidity of a shaft of an exercise apparatus. The detection device is attached to the shaft, and the exercise device A sensor unit that detects the exercise information of the appliance; and a communication unit that transmits the exercise information detected by the sensor unit to the information processing device, wherein the information processing device includes a communication unit that receives the exercise information; An analysis unit that analyzes the inertial force generated in the shaft by a swing motion based on the received motion information; and an evaluation unit that evaluates the rigidity of the shaft based on a result analyzed by the analysis unit. The analysis unit acts on the shaft in a reversing operation in which the direction of the swing motion is switched, and forms a first direction along the direction of the shaft. And a component in a second direction orthogonal to the first direction, and the evaluation unit calculates the shaft based on the component in the first direction and the component in the second direction. It is characterized by evaluating rigidity.

  According to such a configuration, when an exercise device having a shaft performs a swing motion, the inertial force acting on the shaft in the reversing operation in which the swing direction is switched is calculated based on the motion information detected by the sensor unit, The first direction component indicating the direction and the second direction component orthogonal to the first direction are calculated and divided into the first direction component and the second direction component. Based on this, the characteristics related to the rigidity of the shaft are evaluated. Therefore, the evaluation apparatus can easily and quickly evaluate the characteristics relating to the rigidity of the shaft in the exercise apparatus based on the orthogonal direction component of the inertial force acting on the shaft.

[Application Example 9]
In the evaluation system according to the application example, the sensor unit may include an acceleration sensor and a gyro sensor, and the motion information may include an acceleration detected by the acceleration sensor and an angular velocity detected by the gyro sensor.

The figure which shows the structure of the golf swing analyzer which concerns on embodiment of this invention. The figure which shows the analysis model of a golf club schematically. The figure which shows the function of an arithmetic processing circuit roughly. The figure which shows the locus | trajectory assumed when swinging a golf club. The figure which shows an example of the image data which an image process part produces | generates.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment)
(1) Configuration of Golf Swing Analysis Device FIG. 1 schematically shows a configuration of a golf swing analysis device 11 according to an embodiment of the present invention. FIG. 2 schematically shows an analysis model of the golf club 13. The golf swing analysis device 11 corresponds to an evaluation device and an evaluation system.
The golf swing analysis device 11 includes an inertial sensor 12. The inertial sensor 12 includes an acceleration sensor and a gyro sensor. The acceleration sensor can individually detect acceleration in three axial directions orthogonal to each other. Further, the gyro sensor can individually detect angular velocities around the three axes orthogonal to each other.
The inertial sensor 12 outputs acceleration and angular velocity detection signals detected by the acceleration sensor and the gyro sensor. The inertial sensor 12 corresponds to a sensor unit, and the detection signal corresponds to motion information.

In the present embodiment, the inertial sensor 12 is attached to a long axis that connects the grip GR of the golf club 13 that is an exercise equipment and the head HE, that is, a so-called shaft SH in a state in which the inertial sensor 12 cannot be relatively moved. Here, one of the detection axes of the inertial sensor 12 is fitted in parallel with the shaft SH of the golf club 13.
The golf swing analysis device 11 includes a display device 19, an image processing circuit 18, an arithmetic processing circuit 14, a storage device 16, an input device 21, and an interface 15. In the present embodiment, the display device 19, the image processing circuit 18, the arithmetic processing circuit 14, the storage device 16, and the input device 21 are a computer device corresponding to an information processing device, a high-function mobile phone such as a smartphone, A mode implemented in a multifunctional mobile terminal such as a tablet is assumed.

The arithmetic processing circuit 14 is connected to the inertial sensor 12 via a predetermined interface 15.
The interface 15 is connected to be communicable via wired or wireless. For example, the wireless interface 15 includes a wireless LAN (Local Area Network), Bluetooth (registered trademark), UWB (Ultra Wide Band), a transmission unit and a reception unit (communication unit) using short-range wireless such as infrared communication. Aspects can also be envisaged.
The arithmetic processing circuit 14 acquires a detection signal from the inertial sensor 12 via the interface 15.
A storage device 16 is connected to the arithmetic processing circuit 14. The storage device 16 can store, for example, a program (golf swing analysis software program) 17 and related data. The arithmetic processing circuit 14 executes a golf swing analysis software program 17 to realize a golf swing analysis method.

The storage device 16 includes a DRAM (Dynamic Random Access Memory), a mass storage device unit, a nonvolatile memory, and the like. For example, in the DRAM, the golf swing analysis software program 17 is temporarily stored when the golf swing analysis method is executed. A golf swing analysis software program 17 and data are stored in a mass storage unit such as a hard disk drive (HDD). The non-volatile memory stores a relatively small capacity program such as BIOS (basic input / output system) and data.
An image processing circuit 18 is connected to the arithmetic processing circuit 14. The arithmetic processing circuit 14 sends predetermined image data to the image processing circuit 18. A display device 19 is connected to the image processing circuit 18. The image processing circuit 18 sends an image signal to the display device 19 according to the input image data. Thereby, an image based on the image signal is displayed on the screen of the display device 19. The display device 19 is assumed to be a liquid crystal display or other flat panel display.

An input device 21 is connected to the arithmetic processing circuit 14. Character information and numerical information are input from the input device 21 to the arithmetic processing circuit 14. The input device 21 is assumed to be a keyboard or a touch panel, for example.
The inertial sensor 12 outputs an acceleration signal and an angular velocity signal. For acceleration signals, the acceleration

Is specified, and the angular velocity ω is specified in the angular velocity signal. The inertial sensor 12 corresponds to a detection device.
The arithmetic processing circuit 14 fixes the local coordinate system ΣL to the golf club 13. The coordinate axis of the local coordinate system ΣL is expressed by (η, ξ, l). The origin of the local coordinate system ΣL is set on the grip GR of the golf club 13. The grip GR forms a fulcrum for pendulum movement. For example, the l-axis is aligned with the axis of the golf club 13. A unit vector el in the l-axis direction is set according to the local coordinate system ΣL.
(2) Configuration of Arithmetic Processing Circuit FIG. 3 schematically shows the function of the arithmetic processing circuit 14.
The arithmetic processing circuit 14 includes an element calculation unit 31, a bending moment calculation unit 34, a bending moment analysis unit 35, and an image generation unit 36. In addition, the element calculation unit 31 includes a force calculation unit 32 and a torque calculation unit 33. The element calculation unit 31, the bending moment calculation unit 34, and the bending moment analysis unit 35 correspond to an analysis unit.

The element calculation unit 31 acquires an acceleration signal and an angular velocity signal from the inertial sensor 12. Moreover, the element calculating part 31 calculates the component value requested | required for the calculation of an energy change rate based on the acquired acceleration and angular velocity. The element calculation unit 31 acquires various numerical values from the storage device 16 when calculating the component values.
The force calculator 32 calculates an internal force F (see FIG. 2) that acts on the grip GR of the golf club 13. The force calculation unit 32 acquires the acceleration signal of the inertial sensor 12 and the mass data of the golf club 13 in order to calculate the internal force F. This mass data is stored in advance in the storage device 16, and the mass m of the golf club 13 is described. The internal force F is calculated according to the following equation (2).

  At this time,

Indicates the acceleration of the center of gravity 25 (see FIG. 2) of the golf club 13. The constant g indicates the gravitational acceleration. The acceleration of the center of gravity 25 is calculated from the measured value of the inertial sensor 12. The force calculation unit 32 outputs the value of the internal force F as an internal force signal that can be specified.
The torque calculator 33 calculates a torque τ that acts around the grip GR of the golf club 13. The torque calculation unit 33 acquires the angular velocity signal, inertia tensor data, length data, and internal force signal of the inertial sensor 12 when calculating the torque τ. Inertia tensor data describes the inertia tensor J of the golf club 13. In the length data, a length lg from the grip GR (fulcrum) to the center of gravity 25 is described. The inertia tensor data and the length data are stored in the storage device 16 in advance. The internal force signal is supplied from the force calculation unit 32. The torque τ is calculated according to the following equation (4).

The torque calculator 33 outputs a torque signal that can specify the value of the torque τ.
The bending moment calculator 34 calculates a bending moment (including the maximum value of the bending moment) that acts on the golf club 13 by the inertial force due to the swing motion. The bending moment calculator 34 obtains the angular velocity signal and inertia tensor data of the inertial sensor 12 when calculating the bending moment. Then, the bending moment calculator 34 calculates the bending moment according to the following equation (5).

  The bending moment calculator 34 outputs a bending moment signal that can specify the value of the bending moment. Here, the bending moment calculator 34 calculates a torque (lgel × F) accompanying the internal force F of the golf club 13. At this time, the bending moment calculator 34 outputs a torque component signal. The torque component signal specifies the value of torque (lgel × F) and the value of torque τ. The bending moment may be calculated according to the right side of Equation 5. In this case, the bending moment calculator 34 may acquire length data from the storage device 16, acquire a torque signal from the torque calculator 33, and acquire an internal force signal from the force calculator 32. The bending moment signal is supplied to the bending moment analysis unit 35.

The bending moment analysis unit 35 analyzes the state of the shaft SH of the golf club 13 based on the bending moment signal supplied from the bending moment calculation unit 34.
Here, with reference to FIG. 4, the analysis procedure regarding the state of the shaft SH will be described. FIG. 4 shows the trajectory of the golf club 13 assumed when the user swings while holding the golf club 13.
GP1 and HP1 indicate the positions of the grip GR and the head HE of the golf club 13 at the start of the backswing. GP2 and HP2 indicate the positions of the grip GR and the head HE of the golf club 13 in a so-called half-way back. Further, GP3 and HP3 indicate the positions of the grip GR and the head HE of the golf club 13 at the top, and GP4 and HP4 indicate the positions of the grip GR and the head HE of the golf club 13 at the start of the downswing. ing. When transitioning from the top state to the downswing start state, the user moves the golf club 13 by making a so-called game.

In the present embodiment, the operation of switching the swing direction, that is, the operation of switching the golf club 13 from the half way back state to the state of impacting the ball (not shown) by the down swing is performed as the reversing operation. Call it.
The bending moment analysis unit 35 introduces a local coordinate system configured with an XYZ coordinate system for the golf club 13. In this case, the X-axis direction indicates the movement direction of the shaft SH, that is, the direction (second direction) orthogonal to the face surface of the head HE. The Y-axis direction indicates the axial direction (first direction) of the shaft SH. The Z-axis direction indicates a normal direction (second direction) orthogonal to the X-axis and the Y-axis.
The bending moment analysis unit 35 calculates the bending moment divided in the XYZ directions based on the bending moment signal in the turning operation. Further, the bending moment analysis unit 35 calculates a ratio (balance ratio) between the bending moment in the Y-axis direction and the bending moment in the X-axis direction among the calculated bending moments in each direction. The calculated balance ratio information is supplied to the image generation unit 36. In calculating the balance ratio, the bending moment in the Z-axis direction may be referred to in addition to the bending moment in the X-axis direction.

Based on the balance ratio information supplied from the bending moment analysis unit 35, the image generation unit 36 generates image data indicating the suitability of the hardness of the used golf club 13. The generated image data is displayed on the display device 19. The image generation unit 36 corresponds to an evaluation unit.
FIG. 5 is an example of an image indicated by the image data generated by the image generation unit 36. In the case of FIG. 5, it can be said that the bending moment component in the Y-axis direction is larger than the bending moment component in the other direction, that is, the balance ratio is larger in the Y-axis direction. Thus, when the balance ratio is large in the Y-axis direction, it is generally said that a shaft SH having a hard tone on the hand side is suitable.
On the other hand, when the balance ratio is small in the Y-axis direction, it is generally said that a head tone SH having a hard head HE side is suitable. In FIG. 5, the user swings with a plurality of golf clubs 13 having different shafts SH, and the result is that the shaft SH of the first tone fits in any case.

According to the embodiment described above, the following effects can be obtained.
(1) A user grasps and swings the golf club 13 on which the inertial sensor 12 is mounted, calculates a bending moment based on an acceleration signal and an angular velocity signal obtained from the inertial sensor 12, and analyzes the calculated bending moment. Thereby, the suitability with the user with respect to the shaft SH of the golf club 13 can be quickly determined. Therefore, the user can easily find the golf club 13 having rigidity suitable for his / her characteristics at a golf shop or the like equipped with the golf swing analysis device 11.

As mentioned above, although this invention was demonstrated based on embodiment shown in figure, this invention is not limited to this embodiment, The modification as described below can also be assumed.
(1) Based on the acceleration signal and the angular velocity signal output from the inertial sensor 12, the bending moment due to the inertial force is calculated, and the suitability of the golf club 13 with respect to the shaft SH is determined based on the bending moment. It is not limited. For example, the suitability of the golf club 13 with respect to the shaft SH may be determined based on the torque τ calculated by the torque calculator 33.
(2) Although the processing function, the display function, and the input function of the golf swing analyzing apparatus 11 employ a separate configuration from the inertial sensor 12 mounted on the shaft SH, an integrated configuration mounted on the shaft SH can also be assumed.
An apparatus that implements the above-described method may be realized by a single apparatus or may be realized by combining a plurality of apparatuses, and includes various aspects.

  Each functional unit of the arithmetic processing circuit 14 shown in FIG. 3 indicates a functional configuration realized by cooperation of hardware and software, and a specific mounting form is not particularly limited. Therefore, it is not always necessary to mount hardware corresponding to each function unit individually, and it is of course possible to realize a function of a plurality of function units by one processor executing a program. In addition, in the above embodiment, a part of the function realized by software may be realized by hardware, or a part of the function realized by hardware may be realized by software. In addition, specific detailed configurations of other parts of the golf swing analyzing apparatus 11 can be arbitrarily changed without departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 11 ... Golf swing analysis apparatus, 12 ... Inertial sensor, 13 ... Golf club, 14 ... Arithmetic processing circuit, 15 ... Interface, 16 ... Memory | storage device, 17 ... Golf swing analysis software program, 18 ... Image processing circuit, 19 ... Display apparatus , 21 ... input device, 25 ... center of gravity, 31 ... element calculation section, 32 ... force calculation section, 33 ... torque calculation section, 34 ... bending moment calculation section, 35 ... bending moment analysis section, 36 ... image generation section, HE ... Head, SH ... shaft, GR ... grip.

Claims (9)

An evaluation device for evaluating the rigidity of a shaft of an exercise device,
A communication unit that receives exercise information of the exercise apparatus in a swing exercise from a sensor unit;
Based on the motion information, an analysis unit that analyzes the inertial force generated in the shaft by the swing motion;
An evaluation unit that evaluates the rigidity of the shaft based on the result of analysis by the analysis unit;
The analysis unit acts on the shaft in a reversing operation in which the direction of the swing motion switches, and a component in a first direction along the direction of the shaft and a component in a second direction orthogonal to the first direction And
The evaluation unit evaluates rigidity of the shaft based on a component in the first direction and a component in the second direction. The evaluation apparatus according to claim 1,
The evaluation unit evaluates the rigidity of the shaft based on a ratio of a component in the first direction and a component in the second direction. In the evaluation apparatus according to claim 1 or 2,
The analysis device calculates at least one of a bending moment and torque acting on the shaft by the inertial force. In the evaluation apparatus as described in any one of Claims 1 thru | or 3,
The evaluation is characterized in that the second direction is at least one of a moving direction in which the shaft is moved by the swing motion and a normal direction orthogonal to the moving direction and the first direction. apparatus. In the evaluation apparatus as described in any one of Claims 1 thru | or 4,
The evaluation unit generates an image for displaying the component in the first direction and the component in the second direction by coordinates. In the evaluation apparatus as described in any one of Claims 1 thru | or 5,
The exercise apparatus is a golf club;
The evaluation device characterized in that the switching operation is an operation until the golf club changes from a halfway back state to an impact state. The evaluation apparatus according to claim 6,
The evaluation unit generates information on the shaft of the golf club suitable for a user based on the component in the first direction and the component in the second direction. An evaluation system in which a detection device and an information processing device are communicably connected, and evaluate the rigidity of the shaft of the exercise equipment,
The detection device includes:
A sensor unit mounted on the shaft for detecting exercise information of the exercise apparatus;
A communication unit that transmits the exercise information detected by the sensor unit to the information processing device,
The information processing apparatus includes:
A communication unit for receiving the exercise information;
Based on the received motion information, an analysis unit that analyzes an inertial force generated in the shaft by a swing motion;
An evaluation unit that evaluates the rigidity of the shaft based on the result of analysis by the analysis unit;
The analysis unit acts on the shaft in a reversing operation in which the direction of the swing motion switches, and a component in a first direction along the direction of the shaft and a component in a second direction orthogonal to the first direction And
The evaluation system evaluates the rigidity of the shaft based on a component in the first direction and a component in the second direction. The evaluation system according to claim 8,
The sensor unit includes an acceleration sensor and a gyro sensor,
The evaluation system, wherein the motion information includes an acceleration detected by the acceleration sensor and an angular velocity detected by the gyro sensor.

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