Basic Study on Sound Absorbing Mechanism of MPP Affected by Bending Resonance

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  • Kamada Yoshinobu
    （独）国立高等専門学校機構 新居浜工業高等 専門学校
  • Kashiwao Tomoaki
    （独）国立高等専門学校機構 新居浜工業高等 専門学校
  • Hoshino Shuto
    （独）国立高等専門学校機構 新居浜工業高等 専門学校
  • Shimada Takafumi
    （独）国立高等専門学校機構 新居浜工業高等 専門学校

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  • 曲げ共振が影響する微細穿孔板の吸音機構についての基礎的研究
  • マゲ キョウシン ガ エイキョウ スル ビサイ センコウバン ノ キュウオン キコウ ニ ツイテ ノ キソテキ ケンキュウ

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Abstract

Micro-perforated panels with honeycomb core joined or contacted behind are molded by 3D printer, and their sound absorption coefficients are measured by an acoustic impedance tube. When the thickness of panel becomes as thin as 0.1mm, its bending natural frequencies concentrate and couple with Helmholtz resonance. Based on the interpretation of such thin MPP’s sound absorbing mechanism, a new type of MPP with cylinder around each hole is proposed so as to effectively control the natural frequency of panel bending and Helmholtz resonance separately. It is evaluated for such type of MPP to improve the performance of lower frequency range.

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