JP2007061606A5

JP2007061606A5 -

Info

Publication number: JP2007061606A5
Application number: JP2006222100A
Authority: JP
Filing date: 2006-07-20
Publication date: 2010-01-21
Anticipated expiration: 2026-07-20

Claims

A method for predicting a golfer's ability to hit a ball,
Based on the golfer's swing using the golf club, the golfer's multiple pre-impact swing characteristics, including impact position, golf club head orientation, and golf club head speed, are determined,
A plurality of product characteristics including a plurality of golf ball characteristics and a plurality of golf club characteristics, wherein the plurality of golf ball characteristics includes a coefficient of restitution at a plurality of speeds and a contact time at a plurality of speeds, and the plurality of golf club characteristics Includes the center of mass of the club head, the center of the club face and the moment of inertia,
Based on the plurality of ball characteristics, the plurality of club characteristics, and the plurality of pre-impact swing characteristics, a slip between the golf club and the golf ball is obtained.
Determining the characteristics of the shaft of the golf club including a longitudinal force component and a torque component with respect to the impact of the golf ball by the club head;
Based on the slip, the plurality of product characteristics, and the plurality of pre-impact swing characteristics, a predicted trajectory of the golf ball and a plurality of predicted ball launch states when hit with the golf club are generated, and the predicted trajectory Is based on the equations of motion of the ball, club head, and shaft, the equation of motion of the shaft comprising a predetermined number of differential equations for each predetermined segment of the shaft ,
A method involving that.

Obtaining the slip includes a first slip period between the golf club and the golf ball, a stick period between the golf club and the golf ball, and between the golf club and the golf ball. The method of claim 1 including determining a second slip period.

The method of claim 2, wherein determining the slip comprises calculating each time step in the first slip period, the stick period, and the second slip period in microsecond time intervals.

The method of claim 3, wherein the calculation of each time step is based on a lateral force of the golf ball, a friction coefficient of the golf ball, and a normal force of the golf ball.

The method of claim 1, wherein the predicted trajectory includes at least one of a distance, a flight path, a landing position, and a final rest position.

The method of claim 1, wherein the plurality of predicted ball launch conditions includes at least one of side spin, back spin, rifle spin, azimuth angle, launch angle, and velocity.

A method for predicting a golfer's ability to hit a ball,
Based on the golfer's swing using the golf club, the golfer's multiple pre-impact swing characteristics, including impact position, golf club head orientation, and golf club head speed, are determined,
A plurality of product characteristics including a plurality of golf ball characteristics and a plurality of golf club characteristics, wherein the plurality of golf ball characteristics includes a coefficient of restitution at a plurality of speeds and a contact time at a plurality of speeds, and the plurality of golf club characteristics Includes the center of mass of the club head, the center of the club face and the moment of inertia,
The influence of the characteristics of the golf club shaft on the impact of the golf ball by the club head is determined, and the characteristics of the shaft include a longitudinal force component and a torque component,
Characteristics of the shaft, the plurality of article characteristics, and based on the plurality of pre-impact swing characteristics, to generate a predicted trajectory and a plurality of predicted ball launch conditions of the golf ball when struck by the golf club, the The predicted trajectory is based on the ball, club head, and shaft equations of motion, the shaft equation of motion comprising a predetermined number of differential equations for each predetermined segment of the shaft ,
A method involving that.

8. The method of claim 7, further comprising determining a slip between the golf club and the golf ball based on the plurality of ball characteristics, the plurality of club characteristics, and the plurality of pre-impact swing characteristics.

The method of claim 7, wherein the shaft characteristics further comprise at least one of shear force, bending moment, density, shear modulus, and Young's modulus.

Obtaining the slip includes a first slip period between the golf club and the golf ball, a stick period between the golf club and the golf ball, and between the golf club and the golf ball. The method of claim 7, comprising determining a second slip period.

The method of claim 7, wherein the predicted trajectory includes at least one of a distance, a flight path, a landing position, and a final rest position.

The method of claim 7, wherein the plurality of predicted ball launch conditions includes at least one of side spin, back spin, rifle spin, azimuth angle, launch angle, and velocity.

The method of claim 10, wherein determining the slip comprises calculating each time step in the first slip period, the stick period, and the second slip period in microsecond time intervals.

Modifying at least one of the plurality of article characteristics;
Generating another predicted trajectory and another plurality of predicted ball launch conditions for the golf ball when struck by the golf club based on the at least one modified article characteristic;
The method of claim 7 further comprising:

The method of claim 14, wherein the plurality of product characteristics includes a golf club center of mass, a golf club mass distribution, a golf club face center, a golf club moment of inertia, and a golf club face coefficient of friction.

The method of claim 14, wherein the modifying comprises using one or more different golf balls.

A method for predicting a golfer's ability to hit a ball,
Based on the golfer's swing using the golf club, the golfer's multiple pre-impact swing characteristics, including impact position, golf club head orientation, and golf club head speed, are determined,
A plurality of product characteristics including a plurality of golf ball characteristics and a plurality of golf club characteristics, wherein the plurality of golf ball characteristics includes a coefficient of restitution at a plurality of speeds and a contact time at a plurality of speeds, and the plurality of golf club characteristics Includes the center of mass of the club head, the center of the club face and the moment of inertia,
Based on the plurality of ball characteristics, the plurality of club characteristics, and the plurality of pre-impact swing characteristics, a slip between the golf club and the golf ball is obtained.
The influence of the characteristics of the golf club shaft on the impact of the golf ball by the club head is determined, and the characteristics of the shaft include a longitudinal force component and a torque component,
Based on the slip, the plurality of product characteristics, and the plurality of pre-impact swing characteristics, a predicted trajectory of the golf ball and a plurality of predicted ball launch states when hit with the golf club are generated, and the predicted trajectory Is based on the ball, club head, and shaft equations of motion, the shaft equation of motion comprising a predetermined number of differential equations for each predetermined segment of the shaft ,
A method involving that.

Obtaining the slip includes a first slip period between the golf club and the golf ball, a stick period between the golf club and the golf ball, and between the golf club and the golf ball. The method of claim 17, comprising determining a second slip period.

The method of claim 17, wherein the shaft properties further comprise at least one of shear force, bending moment, density, shear modulus, and Young's modulus.