Method for predicting a golfer's ball striking performance

• US 6,506,124 B1
• Filed: 12/21/2001
• Issued: 01/14/2003
• Est. Priority Date: 12/21/2001
• Status: Expired due to Term

• Current Assignee: Callaway Golf Company
• Original Assignee: Callaway Golf Company
• Inventors: Manwaring, Scott R., Fan, Frank H., Ligotti, Peter III
• Primary Examiner(s): Sewell, Paul T.
• Assistant Examiner(s): LEGESSE, NINI F
• Application Number:
  US09/683,396
• Time in Patent Office: 389 Days
• Field of Search: 473/409, 473/131, 473/150, 473/152, 473/155, 473/351, 473/198, 473/199, 473/200, 463/3
• US Class Current: 473/198
• CPC Class Codes: A63B 69/3605 Golf club selection aids informing player of his average or expected shot distance for each club

Abstract

A method for a predicting golfer'"'"'s performance is disclosed herein The method inputs the pre-impact swing properties of a golfer, a plurality of mass properties of a first golf club, and a plurality of mass properties of a first golf ball into a rigid body code. Ball launch parameters are generated from the rigid body. The ball launch parameters, a plurality of atmospheric conditions and lift and drag properties of the golf ball are inputted into a trajectory code. This trajectory code is used to predict the performance of a golf ball if struck by the golfer with the golf club under the atmospheric conditions. The method can then predict the performance of the golf ball if struck by the golfer with a different golf club. The method and system of the present invention predict the performance of the golf ball without the golfer actually striking the golf ball.

Claims

1. A method for predicting a golfer'"'"'s ball striking performance, the method comprising:

providing a plurality of golf club head properties for a first golf club head of a first golf club;

providing a plurality of golf ball properties for a first golf ball;

determining a plurality of pre-impact swing properties for the golfer;

generating a plurality of ball launch parameters from the plurality of golf club head properties, the plurality of golf ball properties and the plurality of pre-impact swing properties;

providing a plurality of first atmospheric conditions;

providing a plurality of lift and drag properties for the first golf ball;

inputting the plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties into a trajectory code; and

generating a predicted performance from the trajectory code of the first golf ball if struck with the first golf club by the golfer under the first atmospheric conditions.

2. The method according to claim 1 wherein predicting the performance comprises predicting a trajectory shape, a trajectory apex, a dispersion of the golf ball, a flight distance of the golf ball and a roll distance of the golf ball.

3. The method according to claim 1 wherein the plurality of golf club head properties comprises a mass of the first golf club head, a location of a center of gravity of the first golf club head relative to an impact location of the first golf ball, an inertia tensor of the first golf club head, a geometry of a face of the first golf club head, bulge and roll radii of the face of the first golf club head, a loft of the first golf club head and a face center location of the first golf club head.

4. The method according to claim 3 wherein the plurality of golf club head properties further comprises a coefficient of restitution of the first golf club head when striking the first golf ball, and a spin coefficient of restitution of the first golf club head when striking the first golf ball.

5. The method according to claim 1 wherein the plurality of golf ball properties comprises a mass of the first golf ball, a moment of inertia of the first golf ball and a radius of the first golf ball.

6. The method according to claim 5 wherein the plurality of golf ball properties further comprises a coefficient of restitution of the first golf ball at a speed of 143 feet per second.

7. The method according to claim 1 wherein the plurality of atmospheric conditions comprises a temperature, a pressure, a density of the air, a viscosity of the air, a relative humidity and a wind velocity.

8. The method according to claim 1 wherein the plurality of pre-impact properties comprises an impact location, a motion of the golf club head and an orientation of the golf club head.

9. The method according to claim 8 wherein the motion of the golf club head is provided as a three-orthogonal axes representation of velocity.

10. The method according to claim 8 wherein the motion of the golf club head is provided as speed and a directional vector represented by an elevation angle and an azimuth angle.

11. The method according to claim 1 wherein the plurality of ball launch parameters generated comprises a ball velocity and a ball angular velocity.

12. The method according to claim 1 wherein the plurality of ball launch parameters generated comprises a launch angle of the golf ball, a side angle of the golf ball, a golf ball speed, a spin of the golf ball and a spin axis of the golf ball.

13. The method according to claim 1 further comprising:

providing a plurality of golf club head properties for a second golf club head of a second golf club;

generating a second plurality of ball launch parameters from the plurality of golf club head properties for the second golf club head, the plurality of golf ball properties and the plurality of pre-impact swing properties;

inputting the second plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties into the trajectory code; and

generating a predicted performance from the trajectory code of the first golf ball if struck with the second golf club by the golfer under the first atmospheric conditions.

14. The method according to claim 1 further comprising:

providing a plurality of golf ball properties for a second golf ball;

generating a second plurality of ball launch parameters from the plurality of golf club head properties, the plurality of golf ball properties for the second golf ball and the plurality of pre-impact swing properties;

providing a plurality of lift and drag properties for the second golf ball;

inputting the second plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties for the second golf ball into the trajectory code; and

generating a predicted performance from the trajectory code of the second golf ball if struck with the first golf club by the golfer under the first atmospheric conditions.

15. The method according to claim 1 further comprising:

providing a plurality of second atmospheric conditions;

inputting the ball launch parameters, the plurality of second atmospheric conditions and the plurality of lift and drag properties into the trajectory code; and

generating a predicted performance from the trajectory code of the first golf ball if struck with the first golf club by the golfer under the second atmospheric conditions.

16. A method for predicting a golfer'"'"'s ball striking performance with a multitude of different golf clubs and a multitude of different golf balls, the method comprising:

determining a plurality of pre-impact swing properties for the golfer based on the golfer'"'"'s swing with a first golf club;

inputting a plurality of mass properties of a first golf club, a plurality of mass properties of a first golf ball, and the plurality of pre-impact swing properties into a rigid body code;

generating a first plurality of ball launch parameters from the first rigid body code;

inputting the first plurality of ball launch parameters, a plurality of atmospheric conditions and a plurality of lift and drag properties for the first golf ball into a trajectory code;

generating the performance from the trajectory code of the first golf ball if struck by the golfer with the first golf club under the plurality of atmospheric conditions;

inputting a plurality of mass properties of a second golf club, the plurality of mass properties of the first golf ball, and the plurality of pre-impact swing properties into the rigid body code;

generating a second plurality of ball launch parameters from the rigid body code;

inputting the second plurality of ball launch parameters, the plurality of atmospheric conditions and the plurality of lift and drag properties for the first golf ball into the trajectory code;

generating the performance from the trajectory code of the first golf ba I if struck by the golfer with the second golf club under the first atmospheric conditions;

inputting the plurality of mass properties of the first golf club, a plurality of mass properties of a second golf ball, and the plurality of pre-impact swing properties into the rigid body code;

generating a third plurality of ball launch parameters from the rigid boded code;

inputting the third plurality of ball launch parameters, the plurality of atmospheric conditions and a plurality of lift and drag properties for the second golf ball into the trajectory code; and

generating the performance from the trajectory code of the second golf ball if struck by the golfer with the first golf club under the atmospheric conditions.

17. The method according to claim 16 wherein the first golf ball is a two-piece golf ball and the second golf ball is a three-piece solid golf ball.

18. The method according to claim 16 wherein the first golf club is a driver with a golf club head composed of a cast titanium alloy material and the second golf club is a driver with a golf club head composed of a cast stainless steel alloy.

19. A method for predicting a golfer'"'"'s ball striking performance, the method comprising:

determining a plurality of pre-impact swing properties for the golfer based on the golfer'"'"'s swing with a first golf club;

generating a plurality of ball launch parameters from a plurality of mass properties of the first golf club, a plurality of mass properties of a first golf ball, and the plurality of pre-impact swing properties;

providing a plurality of first atmospheric conditions;

providing a plurality of lift and drag properties for the first golf ball;

inputting the plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties into a trajectory code; and

generating a trajectory shape, a trajectory apex, a dispersion of the golf ball, a flight distance of the golf ball and a roll distance of the first golf ball from the trajectory code if struck by the golfer with the first golf club under the first atmospheric conditions.

20. A method for predicting a golfer'"'"'s ball striking performance, the method comprising:

determining a plurality of pre-impact swing properties for the golfer based on the golfer'"'"'s swing with a first golf club, wherein the plurality of pre-impact properties comprises an impact location, a motion of the golf club head and an orientation of the golf club head;

inputting a plurality of mass properties of the first golf club, a plurality of mass properties of a first golf ball, and the plurality of pre-impact swing properties into equations B1-B13;

generating a first plurality of ball launch parameters from equations B1-B13;

providing a plurality of first atmospheric conditions;

providing a plurality of lift and drag properties for the first golf ball;

inputting the first plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties into a trajectory code;

generating a trajectory shape, a trajectory apex, a dispersion of the golf ball, a flight distance of the golf ball and a roll distance of the first golf ball from the trajectory code if struck by the golfer with the first golf club under the first atmospheric conditions;

generating a second plurality of ball launch parameters from a plurality of mass properties of a second golf club, the plurality of mass properties of the first golf ball, and the plurality of pre-impact swing properties;

inputting the second plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties into the trajectory code; and

generating the trajectory shape, the trajectory apex, the dispersion of the golf ball, the flight distance of the golf ball and the roll distance of the first golf ball from the trajectory code if struck by the golfer with the second golf club under the first atmospheric conditions.

21. A method for predicting a golfer'"'"'s ball striking performance, the method comprising:

determining a plurality of pre-impact swing properties for the golfer based on the golfer'"'"'s swing with a first golf club, wherein the plurality of pre-impact properties comprises an impact location, a motion of the golf club head and an orientation of the golf club head;

generating a first plurality of ball launch parameters from a plurality of mass properties of the first golf club, a plurality of mass properties of a first golf ball, and the plurality of pre-impact swing properties, wherein the first plurality of ball launch parameters generated comprises a launch angle of the golf ball, a side angle of the golf ball, a golf ball speed, a spin of the golf ball and a spin axis of the golf ball;

providing a plurality of first atmospheric conditions;

providing a plurality of lift and drag properties for the first golf ball;

inputting the plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties into a trajectory code;

generating a trajectory shape, a trajectory apex, a dispersion of the golf ball, a flight distance of the golf ball and a roll distance of the first golf ball from the trajectory code if struck by the golfer with the first golf club under the first atmospheric conditions;

generating a second plurality of ball launch parameters from the plurality of mass properties of the first golf club, a plurality of mass properties of a second golf ball, and the plurality of pre-impact swing properties;

inputting the second plurality of ball launch parameters, the plurality of first atmospheric conditions and the plurality of lift and drag properties into the trajectory code; and

generating the trajectory shape, the trajectory apex, the dispersion of the golf ball, the flight distance of the golf ball and the roll distance of the second golf ball from the trajectory code if struck by the golfer with the first golf club under the first atmospheric conditions.