ゴルフクラブ打球音の予測精度向上

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Golfers choose their clubs according to their feelings. The impact sound of the club with a ball greatly affects such feelings. The golf associations in each country are enforcing rules that limit the performance of golf clubs. Therefore, attention is being paid to the quality of impact sound. The purpose of this research was to develop a CAE tool to help design golf clubs which have an agreeable impact sound. As for past research results, differences were found between "sound measured by experiment" and "sound calculated by program". The cause of the difference was that the program calculated only direct sound, while diffracted sound and reflected sound were not calculated. Therefore, in this study diffracted sound and reflected sound were calculated by using the Huygens-Fresnel principle. The practicability of this program was examined by use of a cylinder. Calculated surface velocity was compared with experimental values. They were found to be almost coincident. In the comparison of direct sound, the results also were almost coincident. But they have been found to be different when compared to results using the ear. This is because the identification of the modal damping ratio becomes difficult. In the comparison of diffracted sound and reflected sound, calculation accuracy is improved by using the Huygens-Fresnel principle. But comparison of results showed some differences because modal damping ratio error still occurs. Next, iron clubs without shafts were examined. Comparison of results showed differences at natural frequencies because the Finite Element Model is not so accurate.

ゴルフクラブ打球音の予測精度向上

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