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The impact sound and vibration significantly affect the usability of a golf club. Recently, a subjective evaluation of the golf club was carried out to determine the relationship between the sound of the impact and its auditory impressions, in which the impact sound of the golf club was improved. Then, the relationship between the impact vibration and the shot impressions that were transmitted to the hand was investigated, and efforts were made to improve the ability to differentiate the usability among the products. However, these research efforts independently investigate the impact sound and vibration. In this research, conditions favorable to the impact sound and vibration were studied in a subjective evaluation based on the semantic differential method to improve the impact sound of a golf club. Then, conditions were derived from the combination to enhance the comfort of the impact sound and its relationship with the impact vibration. Furthermore, the research considered whether the vibrations that were created during a comfortable impact sound enhanced the comfort of the impact sound. As the result, the following things were determined. The impression change was discovered when characteristics of the impact vibration changed. First, reducing the amplitude of vibrations in golf shafts can improve the shrillness, reverberation, and especially the cleanness of the impact sound. Reducing the decay of vibrations in golf shafts improves the reverberation, but impairs the cleanness and shrillness. Finally, higher frequency components of the impact vibration can homogeneously improve the cleanness, shrillness, and reverberation of impact sound impressions. Moreover, two conditions of the impact vibration that enhance the comfort of the impact sound are to reduce vibrations and reduce the amplitude of low frequencies. |
