和弓における動力学的解析 (非線形復元ばね特性と動的挙動)

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書誌事項

タイトル別名
  • Nonlinear Dynamic Analysis of a Japanese bow (Nonlinear Spring Characteristics and Dynamic Behavior)
  • ワ ユミ ニ オケル ドウリキガクテキ カイセキ(ヒセンケイ フクゲンバネ トクセイ ト ドウテキ キョドウ)

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抄録

<p>Traditional Japanese bows have a laminated structure made up of highly flexible bamboo and wood. Each bow is composed of multi arcs having different cross sectional areas along the length and also with different radii of curvature. Three stages setting procedure is required before shooting a Japanese bow. At first the bow is standing free, then, it is bent and constrained to have negative curvature using the bow string (chord), and finally formed into various shapes having positive curvature. Japanese bows does not have a symmetrical shape, and the position of the grip is also shifted from the center of the bow. Therefore, the deformation characteristics and the dynamics to analyze Japanese bows are very complicated. In recent years, large deformation analyses of the flexible bows have attracted attention considerably because of both analytical and technological interests in the design of bows and arrows. This study presents the details of the theoretical analysis results of Japanese bows obtained by using a simplified model consisting of multi arc segments. Each segment is treated as a large deformable nonlinear flexible beam and deformation analysis of individual arc segments is done by using the elliptic integral derived from Elastica theory. Furthermore, in order to confirm the applicability of the proposed large deformation theory, a large deformation experiment is performed. As a result, the theoretical analysis shows a very good agreement with the experimental results for the large deformed shape of the bow, which was restrained and loaded on the string. Moreover, the dynamic characteristics of Japanese bow and arrow with regard to the parameters such as the radius of curvature and bow arc ratio is evaluated.</p>

収録刊行物

  • ばね論文集

    ばね論文集 2019 (64), 23-31, 2019-03-31

    日本ばね学会

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