Method and device for evaluating restitution characteristics of a golf club head

A method of evaluating restitution characteristics of a golf club head by performing impact vibration through application of an external force to a golf ball impact surface of the golf club head, the method comprising:

• acquiring resonance frequencies of the impact surface in a plurality of mass-added states, which are obtained by affixing respectively a plurality of mass regulating members having known, mutually differing masses to the impact surface, by using a response signal of the impact surface due to the impact vibration;
• and
• computing, by using the resonance frequencies acquired in a plurality of mass-added states, a coefficient of restitution for the impact surface when the impact surface impacts a golf ball.

A device for evaluating restitution characteristics of a golf club head, the device evaluating the restitution characteristics of the golf club head by using a response signal of a golf ball impact surface of a golf club when impact vibration is performed on the impact surface by applying an external force to the impact surface, the device comprising:

• a resonance frequency computing portion that acquires a resonance frequency of the impact surface in a mass added state, which is obtained by affixing a mass regulating member having a known mass to the impact surface, and a resonance frequency of the impact surface in a non-mass added state, in which the mass regulating member is not affixed to the impact surface, by using a response signal of the impact surface due to the impact vibration;
• and
• a restitution coefficient computing portion that obtains, by using the resonance frequency in the mass added state and the resonance frequency in the non-mass added state, a coefficient of restitution for the impact surface when the impact surface is impacted by the golf ball.

A device for evaluating restitution characteristics of a golf club head, the device evaluating the restitution characteristics of the golf club head by using a response signal of a golf ball impact surface of a golf club when impact vibration is performed on the impact surface by applying an external force to the impact surface, the device comprising:

• a resonance frequency computing portion that acquires resonance frequencies of the impact surface by using a response signal of the impact surface due to the impact vibration, with the impact surface in a plurality of mass-added states which are obtained by affixing respectively a plurality of mass regulating members having known, mutually differing masses to the impact surface;
• and
• a restitution coefficient computing portion that obtains, by using the resonance frequencies acquired, a coefficient of restitution for the impact surface when the impact surface is impacted by the golf ball.