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Measurement of the coefficient of restitution of a golf club

  • US 6,585,605 B2
  • Filed: 04/27/2001
  • Issued: 07/01/2003
  • Est. Priority Date: 04/04/2001
  • Status: Expired due to Term
First Claim
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1. A method for predicting a coefficient of restitution (COR) of a golf club, the method comprising:

  • attaching a vibration sensor to a face of the golf club;

    impacting the attached vibration sensor with an excitation device to generate vibrations in the face;

    transmitting a force of excitation from the excitation device and the vibrations measured by the vibration sensor to an analyzer to generate frequency domain data for the golf club;

    generating a graph of frequency versus magnitude of transfer accelerance from the frequency domain data;

    analyzing the phase of the graph of frequency to determine when the face of the golf club is traveling inward and outward for determining a contact point velocity;

    selecting a frequency band to minimize noise, the frequency band ranging from 500 Hertz to a first inflection point of the graph;

    calculating a transfer function from the frequency band of the graph; and

    inputting a golf ball model for a specific golf ball and an impact speed into the transfer function that contains an acceleration magnitude and direction of the face of the golf club in order to generate a predicted COR for the golf club at the impact speed with the specific golf ball, the golf ball model comprising a contact duration of the specific ball, a contact force of the specific ball, a COR of the specific ball and a mass of the specific ball.

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