著者

下野 智史 児玉 斎 鈴木 克幸

出版者

一般社団法人 日本計算工学会

雑誌

日本計算工学会論文集 (ISSN:13478826)

巻号頁・発行日

vol.2017, pp.20170009, 2017-07-24 (Released:2017-07-24)

参考文献数

10

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本研究では, ゴルフショットにおける再現性の指標として身体負荷量を提案し, 飛距離と再現性を同時に満たすためのゴルフシャフトの最適設計を試みた. 飛距離の指標となるヘッドスピードの算出には有限要素法, 再現性の指標となる身体負荷量の算出にはマルチボディダイナミクスによる逆動力学解析を用いた. 身体負荷量は, 閾値を考慮した上半身が発揮する関節トルクの総量と定義した. 最適化計算時には, 計算負荷を考慮して応答曲面法を用いた. パレート解より, ヘッドスピードを重視した場合, 身体負荷量を重視した場合それぞれの最適ゴルフシャフト及びそのときの動作が得られた. ヘッドスピードを重視した場合の最適シャフトを作成し実証実験を行った. コントロールシャフトと比較して, 飛距離が平均8yds, 再現性の評価項目とした左右方向における弾道のバラつきが平均16yds改善された.

著者

下野 智史 児玉 斎 鈴木 克幸

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

pp.15-00294, (Released:2016-01-22)

参考文献数

13

被引用文献数

2 1

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Taylor-made designs are required for golf clubs, in particularly for golf shafts, because the golf equipment have great effects on the performances of players. Our objective is to establish an optimal design method of golf shafts for each player depending on their swing motions. We measured the swing motions with a 6-axis sensor that inserted into the grip end not to prevent normal motions. We analyzed the head motions at the impact using FEM with the swing data, and we tried to figure out the best shaft spec for an optimal impact. The optimization algorithm was followed 4 skilled shaft designers, which means that we had optimized the 4 SPECs in turn as below; 1) Weight, 2) Torque, 3) Flex, 4) EI pattern. As a result, the distance of a subject, a female professional golfer of JLPGA, was improved 11yrd more with the optimized shaft, and she uses the optimized shaft for more than 2 years. Thus our method was proven to be efficacious for some typical players. On the other hand, we were not able to get desired results for another 2 subjects. We believe the causes of undesired results are that some players change their swing motions depending on the shaft spec. We ought to consider the motion adjustment depending on the shaft spec in order to design optimal golf shafts for each player in the near future.

著者

下野 智史 児玉 斎 鈴木 克幸

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集

巻号頁・発行日

vol.82, no.834, pp.15-00294-15-00294, 2016

被引用文献数

1

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Taylor-made designs are required for golf clubs, in particularly for golf shafts, because the golf equipment have great effects on the performances of players. Our objective is to establish an optimal design method of golf shafts for each player depending on their swing motions. We measured the swing motions with a 6-axis sensor that inserted into the grip end not to prevent normal motions. We analyzed the head motions at the impact using FEM with the swing data, and we tried to figure out the best shaft spec for an optimal impact. The optimization algorithm was followed 4 skilled shaft designers, which means that we had optimized the 4 SPECs in turn as below; 1) Weight, 2) Torque, 3) Flex, 4) EI pattern. As a result, the distance of a subject, a female professional golfer of JLPGA, was improved 11yrd more with the optimized shaft, and she uses the optimized shaft for more than 2 years. Thus our method was proven to be efficacious for some typical players. On the other hand, we were not able to get desired results for another 2 subjects. We believe the causes of undesired results are that some players change their swing motions depending on the shaft spec. We ought to consider the motion adjustment depending on the shaft spec in order to design optimal golf shafts for each player in the near future.