篳篥の蘆舌に用いられる葦(<i>Phragmites australis</i>)材の物性(第<b>2</b>報):奏者によって選別された葦材の振動特性  [in Japanese] Physical Properties of a Reed (<i>Phragmites australis</i>) Used for the Vibrating Reed of Japanese Oboe (Hichiriki) II.:Vibrational properties of the reed selected by musicians  [in Japanese]

Access this Article

Search this Article

Author(s)

Abstract

<p>伝統的な篳篥の振動板 (蘆舌) に適した葦の特性を明らかにするために,蘆舌に用いられる葦(<i>Phragmites australis</i>) 材の寸法と繊維方向の振動特性を測定した。円筒状の葦材から板状の試料を作製するために,伝統的な熱圧加工である「ひしぎ」に倣い,中空の稈を分割して熱圧した。 奏者によって選別された葦材の振動特性は,選別されなかったもののそれと大差なかったが,選別された葦材の厚さと外径は狭い範囲 (それぞれ1.2~1.4mmおよび11.5~12.1mm) にあった。篳篥の蘆舌を作るためには,振動特性よりも,寸法が重要であることが示唆された。葦材の動的ヤング率と密度の関係は,維管束鞘と柔細胞からなる力学モデルで近似された。葦材の損失正接は西洋の木管楽器に用いられる葦 (<i>Arundo donax</i>) に比べて著しく低かった。これは水溶性抽出成分の含有量が少ないためと推察された。</p>

<p>The dimensions and vibrational properties of common reeds (<i>Phragmites australis</i>) were investigated to clarify suitable features for making the vibrating parts of traditional Japanese oboes (hichiriki). To determine its vibrational properties, the hollow cylinder of the reed was split and compressed into flat plates, following a traditional heat-compression method (hishigi). The vibrational properties of reeds selected by musicians were not significantly different from those of the ones not selected, whereas the thickness and diameters of the selected reeds were in a narrow range, between 1.2-1.4 mm and 11.5-12.1 mm, respectively. This suggests that the dimensions of reeds, rather than the vibrational properties, are important factors for making hichiriki. The density dependence of the dynamic Young's modulus of the common reeds was expressed by a mechanical model consisting of bundle fibers and parenchyma cells. Because of low extractives content, the mechanical loss tangent of the common reed was much smaller than that of the giant reed (<i>Arundo donax</i>) which is used for Occidental woodwind instruments.</p>

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 65(3), 131-137, 2019

    The Japan Wood Research Society

Codes

  • NII Article ID (NAID)
    130007686260
  • NII NACSIS-CAT ID (NCID)
    AN00240329
  • Text Lang
    JPN
  • ISSN
    0021-4795
  • NDL Article ID
    029912703
  • NDL Call No.
    Z17-484
  • Data Source
    NDL  J-STAGE 
Page Top