JP2018140082A - Measurement system and measurement method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance accuracy of identifying swing start timing.SOLUTION: A measurement system includes: a first measurement unit fitted to a golfer; a second measurement unit for measuring floor reaction force to right and left leg parts of the golfer; and identification means for identifying swing start timing of the golfer based on measurement results of the first measurement unit and the second measurement unit.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a golf swing measurement technique.

  Techniques for analyzing swings have been proposed for improving swings and tools for golfers (Patent Documents 1 to 5).

Japanese Patent Laid-Open No. 2006-209180 JP2015-178026A JP 2012-254205 A JP 2002-034609 A JP 2014-224769 A

  In the swing analysis, data necessary for analysis is extracted from the measurement data measured during the swing and analyzed. In swing analysis, data after the swing start timing is often important. In many cases, data before the swing start timing is not important, and inclusion of this data in the analysis range affects the analysis accuracy. As a method for specifying the swing start timing, Patent Documents 1 to 3 disclose a specifying method based on the angular velocity of a club or an arm, but there is room for improvement in terms of specifying accuracy.

  An object of the present invention is to improve the accuracy of specifying the swing start timing.

According to the present invention,
A first measuring unit to be attached to the golfer;
A second measuring unit for measuring the floor reaction force of the left and right legs of the golfer;
Based on the measurement results of the first measurement unit and the second measurement unit, specifying means for specifying the swing start timing of the golfer;
A measurement system characterized by comprising: is provided.

Further, according to the present invention, a step of acquiring each measurement result of the first measurement unit mounted on the golfer and the second measurement unit for measuring the floor reaction force of the left and right legs of the golfer;
Identifying a swing start timing of the golfer based on the measurement results of the first measurement unit and the second measurement unit,
The measurement method characterized by this is provided.

  According to the present invention, it is possible to improve the accuracy of specifying the swing start timing.

1 is a schematic diagram of a measurement system according to an embodiment of the present invention. (A) is explanatory drawing of a force plate, (B) is explanatory drawing of a foot pressure center, (C) is explanatory drawing of angular velocity around a horizontal axis. The flowchart which shows the process example which a processing apparatus performs. (A)-(C) are examples of a measurement result, (D) is explanatory drawing of the specific example of a start timing.

<System configuration>
FIG. 1 is a schematic diagram of a measurement system A according to an embodiment of the present invention. The measurement system A includes a pair of force plates 1R and 1L, measurement units 2 to 5, a processing device 5, a display device 6, and an input device 7. Arrows X, Y, and Z indicate a three-dimensional coordinate system at the test bat of the measurement system A. The force plates 1R and 1L and the measurement units 2 to 4 are installed corresponding to this coordinate system. The An arrow X and an arrow Y indicate horizontal directions orthogonal to each other, and an arrow Z indicates a vertical direction. Arrow X is set in the direction of the flying ball of the golf ball.

  The force plates 1R and 1L constitute a measurement unit that measures the floor reaction force of the left and right legs of the golfer. The force plates 1R and 1L are arranged side by side in the X direction. The force plate 1R plans to measure the floor reaction force of the golfer's right leg, and the force plate 1L measures the floor reaction force of the golfer's left leg. I plan to do that. The golfer 100 receiving the measurement places the right leg on the force plate 1R and places the left leg on the force plate 1L. In the following description, when the force plates 1R and 1L are not distinguished, they are called force plates 1.

  In this embodiment, a pair of force plates 1R and 1L are used corresponding to the left and right leg portions of the golfer, but a single force plate capable of measuring the floor reaction force of the left and right leg portions can also be adopted. is there.

  The force plate 1 can measure, for example, a translational force in the three axial directions of X, Y, and Z and a moment around the Z axis as a floor reaction force. FIG. 2A is a schematic diagram showing an example of the force plate 1. The force plate 1 is configured by arranging a plurality of load sensors 13 between the main body 11 and the tread board 12, and from the detection results of the plurality of load sensors 13, the translational forces Fx, Fy, Fz in the three axial directions , A moment Mz about the Z axis is derived.

  The force plate 1 can also derive the position and size of the foot pressure center from the detection results of the plurality of load sensors 13. As shown in FIG. 2B, the center of foot pressure of the right leg detected by the force plate 1R is RCOP, and the center of foot pressure of the left leg detected by the force plate 1L is LCOP. Further, from the positions and sizes of the foot pressure centers RCOP and LCOP, the foot pressure center COP in which both legs are viewed as a whole can be calculated. The foot pressure center COP is a position corresponding to the ratio of the size of the foot pressure centers RCOP and LCOP on the line connecting the foot pressure centers RCOP and LCOP, and the middle point when the sizes of the foot pressure centers RCOP and LCOP are the same. If the foot pressure center RCOP is larger, the position is biased toward the foot pressure center RCOP.

  The temporal change in the foot pressure center COP can be referred to as the moving speed of the foot pressure center COP. In the following description, the moving speed of the foot pressure center COP in the X direction is expressed as a speed V, the speed to the rear of the flying ball line is negative, and the speed to the front of the flying ball line is positive.

  Returning to FIG. 1, the measurement unit 2 includes at least an angular velocity sensor. As the measurement unit 2, for example, TSND121 of ATR-Promotions can be used. The measurement unit 2 is attached to the golfer 100, for example, attached to the trunk. In the example shown in the figure, it is worn at the waist. In the example shown in the figure, it is mounted on the back side, but may be mounted on the chest side. The measurement unit 2 measures the angular velocity ω of the golfer 100 during the swing as shown in FIG. The angular velocity ω generally corresponds to the angular velocity around the spine of the golfer 100.

  With reference to FIG. 1, the measurement unit 3 detects an impact. In the case of this embodiment, the impact timing is detected from the hitting sound. For this reason, the measurement unit 3 is a microphone and is disposed near the impact area.

  The measurement unit 4 includes an inertial sensor (at least one of an acceleration sensor and an angular velocity sensor) and is attached to the grip or shaft of the golf club 101. As the measuring unit 4, for example, TSND121 of ATR-Promotions can be used. The measurement result of the measurement unit 4 can be used for a golfer's swing analysis. Further, instead of the measurement unit 3, the impact may be detected based on the detection result of the measurement unit 4. At the time of impact, the acceleration or angular velocity of the golf club 101 changes abruptly. Therefore, the peak timing of the change in the detection result of the measurement unit 4 can be set as the impact timing.

  The measurement unit 5 measures the head speed of the golf club 101 and the trajectory of the hit ball. In the example of FIG. 1, the measuring unit 5 is a ballistic measuring device disposed behind the flying ball line with respect to the hit golf ball. As such a measuring device, for example, TRACKMAN manufactured by TRACKMAN is used. it can. The measurement result of the measurement unit 5 can be used for a golfer's swing analysis. For the purpose of measuring the head speed, the measurement unit 5 is arranged in front of a golf ball in the vicinity of a hit golf ball, for example, as a measurement unit 5 ′ instead of a ballistic measuring device, and is a golf club. It may be a measuring instrument that measures the passage and passing time of the head.

  The processing device 6 can be composed of a general personal computer. The processing device 6 includes a processing unit 61, a storage unit 62, and an I / F unit (interface unit) 63 that are electrically connected to each other. The processing unit 61 is a processor such as a CPU. The storage unit 62 includes one or a plurality of storage devices. The storage device is, for example, a RAM, a ROM, a hard disk, or the like. The storage unit 62 stores programs executed by the processing unit 61 and various data. The program executed by the processing unit 61 can be composed of a plurality of instructions that can be read by the processing unit 61.

  The I / F unit 63 inputs and outputs data between the external device and the processing unit 61. The I / F unit 63 can include an I / O interface and a communication interface. The measurement units 2 to 5 are communicably connected to the processing device 6 by wired communication or wireless communication, and these detection results are acquired by the processing device 6.

  A display device 7 and an input device 8 are connected to the processing device 6. The display device 7 is an electronic image display device such as a liquid crystal display device, for example, and displays the processing result of the processing device 6. The input device 8 is a mouse or a keyboard, and is used by a measurer to input data or give an operation instruction to the processing device 6.

<Measurement processing example>
An example of a measurement processing program executed by the processing unit 61 will be described with reference to FIG. This figure is a flowchart of the measurement processing program. In the present embodiment, the golfer 100 causes the golf club 101 to try a golf ball. And a golfer's swing is analyzed by the measurement units 2-5.

  In S1, initial setting is performed. Here, various settings necessary for the analysis are performed. When the initial setting is completed, the golfer 100 prepares for hitting, starts measurement in S2, and causes the golfer 100 to stand on the force plate 1 and hit the golf ball. By starting the measurement, each measurement result (measurement data) of the measurement units 2 to 5 for each minute time is acquired and stored together with the time information. The storage unit 62 can be used as a storage destination, but may be stored in a data logger provided outside the processing device 6. The measurement may be performed by the golfer 100 for a sufficient time from the start to the end of the swing, and the end of the measurement may be determined by time, or may be determined by the operation of the measurer.

  In S3, the swing start timing is specified from the measurement data acquired in S2. Details will be described later. In S4, a range of data used for swing analysis among the measurement data acquired in S2 is set. Although all of the measurement data acquired in S2 may be used for energy calculation, there are cases where there is a lot of waste. In the present embodiment, by specifying the swing start timing in S3, the data before the start of the swing can be excluded from the range of data used for the swing analysis. Thereby, for example, the preparation operation of the golfer before the swing can be excluded from the measurement data, and the energy exhibited by the golfer during the swing can be analyzed with high accuracy.

  In S5, the swing analysis is performed using the measurement data within the range set in S4. The contents of the swing analysis can include various analyzes such as the relationship between the energy exerted by the golfer during the swing and the energy used for hitting, the track of the golf club, and the like. The analysis result can also be displayed on the display device 6. Thus, one unit of processing is completed.

<Specific example of swing start timing>
A specific example of the swing start timing in S3 will be described with reference to FIG. In the present embodiment, the swing start timing is specified based on the measurement results of the measurement units 1 and 2. By using two types of measurement results, it is possible to improve the accuracy of specifying the swing start timing. In particular, by using the measurement result of the measurement unit 1, the influence of waggle or the like can be reduced and the swing start timing can be specified.

  FIG. 4A illustrates the range of measurement data (target data) used for specifying the swing start timing. The measurement data acquired in S2 includes measurement data in a state that is not substantially during a swing. In specifying the swing start timing, if all the measurement data of the measurement units 1 and 2 acquired in S2 are used, the calculation and accuracy may be affected. Therefore, in the present embodiment, measurement data within a predetermined period going back from the impact timing is used.

  In FIG. 4A, time t0 indicates the measurement start timing, and time ti indicates the impact timing. The impact timing is specified from the measurement data of the measurement unit 3, and the timing at which the sound pressure suddenly increases can be set as the impact timing. The target data is measurement data from time ti to time t1 that goes back from time T. In other words, each measurement data of measurement units 1 and 2 from time t1 to time ti is used to specify the swing start timing. The time T is, for example, several seconds (for example, 2 seconds).

  At the start of a swing, the golfer generally remains stationary for at least a moment. In the present embodiment, the timing at which the golfer stops is specified from the angular velocity ω and the moving velocity V, and this is set as the swing start timing. First, the angular velocity ω will be described.

  FIG. 4B shows the change in angular velocity ω from time t1 to time ti. A section where the angular velocity ω is within the range of the threshold value 1 and the behavior of the golfer around the Z axis are considered to be stationary. The threshold value 1 is, for example, ± 0.1 rad / sec. In the example of FIG. 4B, the angular velocity ω is within the threshold value 1 in the section R11 and the section R12.

  Next, the moving speed V will be described. FIG. 4C shows a change in the moving speed V from time t1 to time ti. The section in which the moving speed V is within the range of the threshold value 2 and the behavior of the golfer in the X direction are considered to be stationary. The threshold value 2 is, for example, ± 100 mm / sec. In the example of FIG. 4C, the moving speed V is within the range of the threshold value 2 in the sections R21 to R26.

  Next, a section in which the angular velocity ω is within the range of the threshold value 1 and the moving speed V is within the range of the threshold value 2 is extracted. FIG. 4D shows the extraction result, and is a section in which sections R31 and R32 are extracted. Then, the latest time among the sections R31 and R32 is specified as the swing start timing. By using the angular velocity ω and the moving velocity V, the swing start timing can be specified with high accuracy. For example, if the swing start timing is specified only by the angular velocity ω, depending on the golfer, the threshold may be exceeded in the preparatory operation before starting the swing, and the swing start timing may not be specified with high accuracy.

  By specifying the swing start timing as described above, the accuracy of specifying the swing start timing can be improved. In the above embodiment, the swing start timing is specified using the angular velocity ω and the moving velocity V. However, instead of the moving velocity V, the moving distance or moving angle of the foot pressure center COP may be used. V is preferred.

  A measuring system, 1R force plate, 1L force plate, 2-5 measuring unit, 5 processing unit

Claims (6)

A first measuring unit to be attached to the golfer;
A second measuring unit for measuring the floor reaction force of the left and right legs of the golfer;
Based on the measurement results of the first measurement unit and the second measurement unit, specifying means for specifying the swing start timing of the golfer;
A measurement system characterized by comprising: The measurement system according to claim 1,
The specifying means is:
The first value of the behavior of the golfer based on the measurement result of the first measurement unit is within a first threshold range, and the second value of the behavior of the golfer based on the measurement result of the second measurement unit Specifying the timing at which the value of the value is within the second threshold range as the swing start timing,
A measurement system characterized by comprising: The measurement system according to claim 1 or 2, wherein
The angular velocity of the golfer is measured by the first measurement unit.
A measurement system characterized by this. The measurement system according to any one of claims 1 to 3,
The movement speed of the golfer's foot pressure center is measured by the second measurement unit.
A measurement system characterized by this. A measurement system according to any one of claims 1 to 4,
A third measuring unit for detecting impact;
The specifying means is:
Of the measurement results of the first measurement unit and the second measurement unit during the swing, based on the measurement results within a predetermined period back from the timing of the impact measured by the third measurement unit, the swing Identify the start timing,
A measurement system characterized by this. Obtaining each measurement result of a first measurement unit mounted on the golfer and a second measurement unit that measures the floor reaction force of the left and right legs of the golfer;
Identifying a swing start timing of the golfer based on the measurement results of the first measurement unit and the second measurement unit,
A measuring method characterized by this.

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