JP6304676B2 - Golf swing analysis apparatus and golf swing analysis method - Google Patents

Description

  The present invention relates to a golf swing analysis device, a golf swing analysis method, and the like.

  For example, as disclosed in Patent Document 1, a golf swing analysis apparatus is generally known. The golf swing analyzer uses an optical motion capture system. The system captures a golfer's swing. A marker is fixed at a specific position of a golfer or a golf club when shooting. The movement locus of the specific position is recorded by the function of the marker. In addition, as disclosed in, for example, Patent Document 2, a golf swing analysis device using an acceleration sensor is sometimes seen. An acceleration sensor is attached to the golf club. The golf swing form is analyzed according to the acceleration measured by the acceleration sensor.

JP 2010-11926 A JP-A-11-169499

  The golf club shaft bends during the swing. The deflection of the golf club affects the flight distance and the direction of the hit ball. Further, the deflection during the swing is influenced by the torque and force applied by the golfer to the shaft during the swing, and it is considered that the torque and the force greatly contribute to the design and selection of the rigidity of the shaft suitable for the golfer. Furthermore, if these torque and force changes during the downswing can be known over time, the tempo of each operation during the golfer's swing can be quantified, which is considered to be useful for improving the swing.

  However, at present, there is no simple method for measuring parameters related to bending, such as torque and force, and the measuring device is complicated by attaching strain gauges to various parts of the golf club and directly measuring the strain. There was a problem that a load was applied.

  According to at least one aspect of the present invention, it is possible to provide a golf swing analysis device, a golf swing analysis method, and the like that are useful for analyzing the deflection of a golf club.

  (1) An aspect of the present invention relates to a golf swing analyzing apparatus including an inertial sensor attached to a golf club, and an arithmetic unit that calculates a bending moment acting on the golf club based on an output of the inertial sensor.

  According to such a golf swing analyzing apparatus, the bending moment applied to the grip during the downswing can be calculated. Such a bending moment is considered to be involved in the occurrence of bending of the golf club. Thus, the bending moment can provide an indication of the golf club stiffness and swing tempo. According to the observation of the bending moment, the rigidity of the shaft suitable for the golfer and the tempo of each operation during the swing can be analyzed. For example, according to the calculated bending moment, it is possible to design or select a club having appropriate rigidity characteristics for the golfer.

  (2) The calculation unit can calculate the maximum value of the bending moment. The maximum bending moment thus calculated is considered to be linked to the golf swing form. Depending on the observation of the maximum bending moment, the golf swing form can be analyzed. For example, by repeatedly changing and observing the form, good improvements can be made to the golf swing form through trial and error.

  (3) The golf swing analyzing apparatus may further include an image processing unit that generates image data for visualizing a change in the bending moment along the time axis. The user can visually present a change in bending moment along the time axis. In this way, the rigidity of the shaft suitable for the golfer can be analyzed.

  (4) The calculation unit can calculate an elapsed time from the start of the downswing to the maximum value of the bending moment and an elapsed time from the maximum value to the minimum value. It is possible to specify the appearance timing of the maximum bending moment during the downswing. In this way, the rigidity of the shaft suitable for the golfer can be analyzed.

  (5) The golf swing analyzing apparatus can select the hardness of the shaft of the golf club from the timing at which the maximum value of the bending moment is generated between the start of the downswing and the impact. Thus, a golf club suitable for a golfer can be selected.

  (6) The inertial sensor may include an acceleration sensor having a plurality of detection axes and a gyro sensor having a plurality of detection axes. According to the acceleration sensor and the gyro sensor, the acceleration and angular velocity information can be accurately detected when calculating the bending moment.

  (7) Another aspect of the present invention relates to a golf swing analysis method for calculating a bending moment acting on the golf club based on an output of an inertial sensor attached to the golf club.

  According to such a golf swing analysis method, the bending moment applied to the grip during the downswing can be calculated. Such a bending moment is considered to be involved in the occurrence of bending of the golf club. Thus, the bending moment can provide an indication regarding the stiffness of the golf club. The rigidity of the shaft suitable for the golfer can be analyzed according to the observation of the bending moment. For example, according to the calculated bending moment, it is possible to design or select a club having appropriate rigidity characteristics for the golfer.

It is a conceptual diagram which shows roughly the structure of the golf swing analyzer which concerns on one Embodiment of this invention. It is a conceptual diagram which shows the analysis model of a golf club schematically. It is a block diagram which shows roughly the structure of a part of arithmetic processing circuit. It is a specific example of a screen display, and is a graph showing a bending moment, changes in each torque, and a maximum bending moment. It is a specific example of a screen display, and is a graph showing the bending moment, changes in each torque, and the appearance timing of the maximum bending moment.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.

(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. The golf swing analysis device 11 includes an inertial sensor 12, for example. 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. The gyro sensor can individually detect the angular velocity around each of three axes orthogonal to each other. The inertial sensor 12 outputs a detection signal. The acceleration and angular velocity are specified for each axis in the detection signal. The acceleration sensor and the gyro sensor can detect acceleration and angular velocity information with relatively high accuracy. The inertial sensor 12 is attached to the golf club 13. The inertial sensor 12 may be fixed to the golf club 13 so as not to be relatively movable. Here, when the inertial sensor 12 is attached, one of the detection axes of the inertial sensor 12 is aligned parallel to the long axis of the golf club 13.

  The golf swing analysis device 11 includes an arithmetic processing circuit 14. An inertial sensor 12 is connected to the arithmetic processing circuit 14. In connection, a predetermined interface circuit 15 is connected to the arithmetic processing circuit 14. The interface circuit 15 may be connected to the inertial sensor 12 by wire or may be connected to the inertial sensor 12 by wireless. A detection signal is supplied from the inertial sensor 12 to the arithmetic processing circuit 14.

  A storage device 16 is connected to the arithmetic processing circuit 14. The storage device 16 can store, for example, a 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 19 can include a DRAM (Dynamic Random Access Memory), a mass storage device unit, a non-volatile memory, and the like. For example, in the DRAM, the golf swing analysis software program 17 is temporarily held when the golf swing analysis method is executed. A golf swing analysis software program and data are stored in a mass storage unit such as a hard disk drive (HDD). The nonvolatile 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. In connection, a predetermined interface circuit (not shown) 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. An image specified by the image signal is displayed on the screen of the display device 19. The display device 19 is a liquid crystal display or other flat panel display. Here, the arithmetic processing circuit 14, the storage device 16, and the image processing circuit 18 are provided as a computer device, for example.

  An input device 21 is connected to the arithmetic processing circuit 14. The input device 21 includes at least alphabet keys and numeric keys. Character information and numerical information are input from the input device 21 to the arithmetic processing circuit 14. The input device 21 may be composed of a keyboard, for example.

が特定され、角速度信号では角速度ωが特定される。 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.

Arithmetic processing circuit 14 fixes the local coordinate system sigma _L to the golf club 13. Coordinate axes of the local coordinate system sigma _L is represented by (η, ξ, l). The origin of the local coordinate system Σ _L is set on the grip 24 of the golf club 13. The grip 24 forms a fulcrum for pendulum movement. For example, the l-axis is aligned with the axis of the golf club 13. Unit vector e _l of l-axis direction is set in accordance with the local coordinate system sigma _L.

(2) Configuration of Arithmetic Processing Circuit FIG. 3 schematically shows a partial configuration of the arithmetic processing circuit 14. The arithmetic processing circuit 14 includes an element calculation unit 31. The element calculation unit 31 is supplied with an acceleration signal and an angular velocity signal from the inertial sensor 12. The element calculation unit 31 calculates a component value required for calculating the energy change rate based on the acceleration and the angular velocity. In the calculation, the element calculation unit 31 acquires various numerical values from the storage device 16.

このとき、

はゴルフクラブ１３の重心２５の加速度を示す。定数ｇは重力加速度を示す。重心２５の加速度は慣性センサー１２の計測値から算出される。力演算部３２は内力信号を出力する。内力信号で内力Ｆの値は特定される。 The element calculation unit 31 includes a force calculation unit 32. The force calculator 32 calculates an internal force F that acts on the golf club 13. In the calculation, the force calculation unit 32 acquires the acceleration signal of the inertial sensor 12 and the mass data of the golf club 13. In the mass data, the mass m of the golf club 13 is described. The mass data may be stored in the storage device 16 in advance. The internal force F is calculated according to the following equation.

At this time,

Indicates the acceleration of the center of gravity 25 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 an internal force signal. The value of the internal force F is specified by the internal force signal.

トルク演算部３３はトルク信号を出力する。トルク信号でトルクτの値は特定される。 The element calculation unit 31 includes a torque calculation unit 33. The torque calculator 33 calculates a torque τ that acts on the golf club 13 around the grip 24. In the calculation, the torque calculation unit 33 acquires an angular velocity signal, inertia tensor data, length data, and internal force signal of the inertial sensor 12. Inertia tensor data describes the inertia tensor J of the golf club 13. The length data length l _g from the grip 24 (fulcrum) to the center of gravity 25 is described. The inertia tensor data and length data may be stored in the storage device 16 in advance. The internal force signal may be supplied from the force calculation unit 32. Torque τ is calculated according to the following equation.

The torque calculation unit 33 outputs a torque signal. The value of torque τ is specified by the torque signal.

曲げモーメント演算部３４は曲げモーメント信号を出力する。曲げモーメント信号は曲げモーメントの値を特定する。ここでは、曲げモーメント演算部３４はゴルフクラブ１３の内力Ｆに伴うトルク（ｌ_ｇｅ_ｌ×Ｆ）を算出する。このとき、曲げモーメント演算部３４はトルク成分信号を出力する。トルク成分信号はトルク（ｌ_ｇｅ_ｌ×Ｆ）の値およびトルクτの値を特定する。その他、曲げモーメントは［数５］の右辺に従って算出されてもよい。この場合には、曲げモーメント演算部３４は、記憶装置１６から長さデータを取得し、トルク演算部３３からトルク信号を取得し、力演算部３２から内力信号を取得すればよい。 The arithmetic processing circuit 14 includes a bending moment calculation unit 34. The bending moment calculator 34 calculates a bending moment (including the maximum value of the bending moment) that acts on the golf club 13. In the calculation, the bending moment calculation unit 34 acquires an angular velocity signal and inertia tensor data of the inertial sensor 12. The bending moment is calculated according to the following formula.

The bending moment calculator 34 outputs a bending moment signal. The bending moment signal specifies the value of the bending moment. Here, the bending moment calculation unit 34 calculates a torque (l _g e ₁ × 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 (l _g e _l × F) and the value of torque τ. In addition, the bending moment may be calculated according to the right side of [Formula 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 and the torque component signal are supplied to the image processing unit 35. Based on the bending moment signal and the torque component signal, the image processing unit 35 generates image data for visualizing changes in the bending moment, the torque τ, and the torque (l _g e _l × F) along the time axis. The first image data is output toward the image processing circuit 18.

  The image processing unit 35 can extract the maximum value of the bending moment based on the bending moment signal. Maximum bending moment data is generated based on the extracted maximum value. The maximum bending moment data specifies the maximum value of the bending moment. The image processing unit 35 can form an image for visualizing the maximum bending moment data in the first image data.

The image processing unit 35 can calculate the elapsed time from the start of the downswing to the maximum value (peak value) of the bending moment and the elapsed time from the maximum value (peak value) to the minimum value (peak value). it can. Swing tempo data is generated based on the calculated elapsed time. The swing tempo data specifies two elapsed times. The image processing unit 35 can generate second image data for visualizing the swing tempo data. The second image data can include an image that visualizes changes in bending moment, torque τ, and torque (l _g e _l × F). The second image data is output toward the image processing circuit 18.

(3) Operation of Golf Swing Analysis Device The operation of the golf swing analysis device 11 will be briefly described. First, the golf swing of the golfer G is measured. Prior to the measurement, necessary information is input from the input device 21 to the arithmetic processing circuit 14. Here, the mass m of the golf club 13, the grip 24 around the inertia tensor J of a golf club 13, the input of the length _{l g} of the grip 24 of a golf club 13 (fulcrum) to the center of gravity _{x g} prompted. The input information is managed under a specific identifier, for example. The identifier may identify a specific golfer G.

  Prior to measurement, the inertial sensor 12 is attached to the golf club 13. The inertial sensor 12 is fixed to the golf club 13 so as not to be relatively displaced. Prior to execution of the golf swing, measurement of the inertial sensor 12 is started. Thereafter, when a golf swing is executed, the inertial sensor 12 continuously measures acceleration and angular velocity at specific time intervals. The time interval defines the resolution of the measurement. The detection signal of the inertial sensor 12 may be sent to the arithmetic processing circuit 14 in real time or may be temporarily stored in a storage device built in the inertial sensor 12. In the latter case, the detection signal may be supplied to the arithmetic processing circuit 14 by wire or wireless after the end of the golf swing.

  The inventor has verified the operation of the golf swing analysis apparatus 11. In the verification, the present inventor observed a bending moment signal and a torque component signal. FIG. 4 is a graph with time [s] on the horizontal axis and bending moment [Nm] on the vertical axis. In this figure, the state from the start of the downswing to the moment of impact is shown. The horizontal axis represents the moment when the golf club impacts the golf ball as 0 [s], for example, −0.30 [s] represents the state 0.30 [s] before the impact. As shown in FIG. 4, a change in bending moment acting on the golf club 13 could be visualized along the time axis. It was confirmed that the maximum bending moment was obtained at a specific timing of the downswing. The value of the maximum bending moment was visually incorporated in the display screen according to the second image data.

  The golf swing analyzer 11 can measure the bending moment applied to the grip 24 during the downswing. Such a bending moment is considered to be involved in the occurrence of bending of the golf club 13. Therefore, the bending moment can provide an indicator of the hardness of the golf club 13, for example, as shown on the left side of FIG. Here, the hardness index of the shaft is expressed as X rank, S rank, R rank, A rank, and L rank in order from the side where the hardness of the shaft is hard. In this embodiment, an example is shown in which it is determined that a relatively stiff shaft from the S rank to the X rank is appropriate.

  The bending moment and the maximum bending moment are considered to be linked to the golf swing form. The maximum bending moment indicates that the torque is most applied to the grip 24 of the golf club 13 during the downswing. In this way, the golf swing form can be analyzed according to the observation of the bending moment. For example, by repeatedly changing and observing the form, it is possible to improve the golf swing form through trial and error. Since the change of the bending moment is visually presented to the user along the time axis, it is possible to provide an effective index regarding the form of the golf swing.

  Similarly, the inventor verified the swing tempo. FIG. 5 shows the swing tempo using the data of FIG. As shown in FIG. 5, the elapsed time (OP section) from the start of the downswing (the left end of the graph) to the maximum value (peak value) of the bending moment, and the minimum value (peak value) from the maximum value (peak value) Value) and the elapsed time (PP interval). In this example, the OP section was 0.20 [s] and the PP section was 0.09 [s]. Thus, the ratio before and after the point when the torque during the downswing becomes maximum can be presented as the swing tempo. In accordance with the tendency that the swing tempo is in the first half or the second half, an index of the shaft hardness according to the swing tempo can be shown.

  In this embodiment, the appearance timing of the maximum value of the bending moment is specified in this way during the downswing. According to such observation of the bending moment, the golf swing form can be analyzed. For example, by repeatedly changing and observing the form, it is possible to improve the golf swing form through trial and error.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Therefore, all such modifications are included in the scope of the present invention. For example, a term described with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configurations and operations of the golf swing analysis device 11, the inertial sensor 12, the arithmetic processing circuit 14, and the like are not limited to those described in the present embodiment, and various modifications can be made.

  DESCRIPTION OF SYMBOLS 11 Golf swing analyzer, 12 Inertial sensor, 13 Golf club, 14 Computation part (arithmetic processing circuit), 35 Image processing part

Claims (7)

A force calculation unit for calculating an internal force acting on the golf club based on an output of an inertial sensor attached to the golf club and a mass of the golf club;
Based on the output and the internal forces of the inertial sensor, and a torque calculation unit for calculating the torque acting on the golf club with the golf club grip around
An arithmetic unit that calculates a bending moment acting on the golf club based on the internal force and the torque;
A golf swing analyzing apparatus comprising:   2. The golf swing analyzing apparatus according to claim 1, wherein the calculation unit calculates a maximum value of the bending moment.   3. The golf swing analyzing apparatus according to claim 1, further comprising an image processing unit that generates image data for visualizing a change in the bending moment along a time axis. The golf swing analysis apparatus according to any one of claims 1 to 3, wherein the calculation unit includes an elapsed time from the start of a downswing to a maximum value of the bending moment, and from the maximum value to the minimum value. A golf swing analyzing apparatus that calculates an elapsed time.   5. The golf swing analysis apparatus according to claim 1, wherein the inertial sensor includes an acceleration sensor having a plurality of detection axes and a gyro sensor having a plurality of detection axes. Golf swing analysis device. In the golf swing analysis apparatus according to any one of claims 1 to 3,
The golf swing analysis apparatus further comprising an image data generation unit that generates image data for displaying the internal force and the change in the torque. Based on the output of an inertial sensor attached to the golf club and the mass of the golf club, an internal force acting on the golf club is calculated,
Wherein based on the output and the internal forces of the inertial sensor to calculate a torque acting on the golf club with the golf club grip around
A golf swing analysis method, comprising: calculating a bending moment acting on the golf club based on the internal force and the torque.

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