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Ballistic trajectory simulation method and flight simulation method for golf ball

  • US 20070010342A1
  • Filed: 03/27/2006
  • Published: 01/11/2007
  • Est. Priority Date: 03/29/2005
  • Status: Active Grant
First Claim
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1. A ballistic trajectory simulation method for analyzing a ballistic trajectory when a golf ball having a plurality of dimples formed on the surface thereof is hit to fly making use of arithmetic operation by a computer, comprising the steps of:

  • (A) setting, in a virtual space set by said computer, a golf ball model of a substantially spherical shape having a plurality of dimples formed on the surface thereof and an air current virtual region which surrounds the golf ball model;

    (B) segmenting the air current virtual region into a large number of lattice segments such that the volume of the lattice segment gradually increases in a direction away from the ball surface of the golf ball model;

    (C) setting a state wherein the golf ball model rotates at a predetermined number of rotations and an air current of a predetermined speed flows from forwardly of the golf ball model into the air current virtual region for a very short period of time and using the set state as a state wherein the golf ball rotates at the predetermined number of rotations and flies at the predetermined speed in the atmospheric air for the very short period of time to calculate the speed, direction and pressure of the air current formed in the air current virtual region for each of the lattice segments;

    (D) integrating the speeds, directions and pressures of the air current calculated for the individual lattice segments to calculate a lift coefficient and a drag coefficient of the golf ball in the air current virtual region in which the air current is generated;

    (E) calculating the flight distance, variation in height and speed of the ball after the golf ball flies for the very short period of time under the gravity from the lift coefficient and the drag coefficient and calculating the number of rotations of the ball after the flight for the very short period of time; and

    (F) setting the calculated number of rotations and the calculated speed as the number of rotations and the speed after lapse of the very short period of time, respectively;

    the operations of (C), (D), (E) and (F) being repeated so that the flight distance and the height of the ball after every lapse of the very short period of time after the ball is hit to fly until the ball drops to the ground are successively calculated to estimate the ballistic trajectory.

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