METHOD FOR EVALUATING HIT FEELING

• US 20120266652A1
• Filed: 04/18/2012
• Published: 10/25/2012
• Est. Priority Date: 04/19/2011
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Dunlop Sports Co. Ltd. (Sumitomo Rubber Industries Limited)
• Inventors: KATO, Masatoshi, Ueda, Masahiko, Asakura, Takeshi, Ueda, Naoyoshi
• Granted Patent: US 9,297,729 B2
• Time in Patent Office: Days
• US Class Current: 73/12.04
• CPC Class Codes: G01N 2203/0676 Force, weight, load, energy, speed or acceleration
• CPC Class Codes: G01N 3/30 by applying a single impulsive force, e.g. by falling weight
• CPC Class Codes: G01P 15/00 Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration

Abstract

An evaluation method for hit feeling of a sport implement according to the present invention includes an acceleration measurement step for measuring acceleration of a sport hitting tool 4 and a data analysis step for analyzing data obtained in the measurement. In the data analysis step, an amount of change in acceleration in a first cycle of vibration after hitting is calculated. The evaluation method evaluates hit feeling to be felt by a person, using the amount of change in the acceleration. Preferably, in the data analysis step, an amount of change in acceleration in the first cycle of predetermined time is calculated. The predetermined time is within 1.5 msec from the time of hitting. Preferably, the sport hitting tool 4 has the hitting section detachably attached to a shaft section.

Claims

1. An evaluation method for hit feeling of a sport implement, comprising:

an acceleration measurement step for measuring acceleration of a sport hitting tool; and

a data analysis step for analyzing data obtained in the measurement,

wherein in the data analysis step, an amount of change in the acceleration in a first cycle of vibration after hitting is calculated, and the hit feeling is evaluated using the amount of change in the acceleration.

2. The evaluation method according to claim 1, wherein in the data analysis step, the amount of change in the acceleration in the first cycle of predetermined time is calculated, and the predetermined time is within 1.5 msec from time of hitting.

3. The evaluation method according to claim 1, wherein in the data analysis step, the amount of change in the acceleration in the first cycle of predetermined time is calculated, and the predetermined time is equal to or longer 0.3 msec from time of hitting.

4. The evaluation method according to claim 1, wherein the amount of change in the acceleration is calculated by using a difference between maximum acceleration and minimum acceleration in the first cycle of vibration.

5. The evaluation method according to claim 1, wherein in the acceleration measurement step, a swing robot holds the sport hitting tool.

6. The evaluation method according to claim 1, wherein

the sport hitting tool comprises a holding section to be held by a person, a hitting section for hitting a ball, and a shaft section connecting the hitting section with the holding section, and

in the acceleration measurement step, a sensor for measuring acceleration is attached to the shaft section, and the sensor is attached, having a space with respect to the hitting section.

7. The evaluation method according to claim 6, wherein a ratio (L1/L) of length L of the shaft section to length L1 from a position where the sensor is attached to a tip of the holding section is equal to or smaller than 0.75.

8. The evaluation method according to claim 6, wherein a ratio (L1/L) of length L of the shaft section to length L1 from a position where the sensor is attached to a tip of the holding section is equal to or smaller than 0.50.

9. The evaluation method according to claim 6, wherein a ratio (L1/L) of length L of the shaft section to length L1 from a position where the sensor is attached to a tip of the holding section is equal to or smaller than 0.25.

10. The evaluation method according to claim 1, wherein

the sport hitting tool comprises a holding section to be held by a person, a hitting section for hitting a ball, and a shaft section connecting the hitting section with the holding section, and

the hitting section is detachably attached to the shaft section.

11. The evaluation method according to claim 10, wherein

the acceleration measurement step comprises a hitting section preparation step, a hitting section replacement step, and a measurement data acquisition step,

in the hitting section preparation step, multiple hitting sections including one hitting section and other hitting section are prepared,

in the hitting section replacement step, the one hitting section is removed from the shaft section, the other hitting section is attached to the shaft section, and the removal of the one hitting section is performed after acceleration is measured with the sport hitting tool provided with the one hitting section, and

in the measurement data acquisition step, acceleration is measured with the sport hitting tool provided with the other hitting section.

12. The evaluation method according to claim 1, wherein

the sport hitting tool comprises a holding section to be held by a person, a hitting section for hitting a ball, and a shaft section connecting the hitting section with the holding section, and

the hitting section comprises a casing and a face for hitting the ball, and the face is detachably attached to the casing.

13. The evaluation method according to claim 12, wherein

the acceleration measurement step comprises a face preparation step, a face replacement step, and a measurement data acquisition step,

in the face preparation step, multiple faces including one face and other face are prepared,

in the face replacement step, the one face is removed from the casing, the other face is attached to the casing, and the removal of the one face is performed after acceleration is measured with the sport hitting tool provided with the one face, and

in the measurement data acquisition step, acceleration is measured with the sport hitting tool provided with the other face.

14. The evaluation method according to claim 1, wherein the sport implement is a golf club or a golf ball.

15. The evaluation method according to claim 14, wherein a loft angle of the golf club is equal to or greater than 20°

.

16. The evaluation method according to claim 14, wherein a loft angle of the golf club is equal to or greater than 40°

.

17. The evaluation method according to claim 14, wherein a loft angle of a golf club for hitting the golf ball is equal to or greater than 20°

.

18. The evaluation method according to claim 14, wherein a loft angle of a golf club for hitting the golf ball is equal to or greater than 40°

.

19. The evaluation method according to claim 14, wherein the amount of change in the acceleration is calculated by using an amount of change in calculation Ax in an X-axis direction which is an axial direction of the shaft section.

20. The evaluation method according to claim 14, wherein the amount of change in the acceleration is calculated by using two or more amounts of changes including at least the amount of change in the acceleration Ax, among the amount of change in the acceleration Ax in the X-axis direction, an amount of change in acceleration Az in a Z-axis direction which is perpendicular to the X-axis direction and parallel to a hitting direction, and an amount of change in acceleration Ay in a Y-axis direction which is perpendicular to the X-axis direction and the Z-axis direction.