Research on the Performances of Resonant Sound-absorbing Structure Based on Continuous and Discontinuous Honeycomb Core Materials
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1.Composite Center, AVIC Manufacturing Technology Institute, Beijing 101300;2.Aircraft Strength Research Institute of China,Xi'an 710065

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TB132

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    Abstract:

    Continuous and discontinuous dual degree of freedom resonance sound absorption structures were prepared by using aramid paper honeycombs, embedded resin partitions and micro-perforated panels. The mechanical properties and sound absorption coefficients of the two resonance sound absorption structures were compared. The results show that: the compression and tensile performances of the resonance absorption structure of the continuous honeycomb core material are higher that of discontinuous honeycomb core material. Among them, the unstabilized compressive strength and tensile strength are 19% higher, the stable compressive strength is 32% higher, the stable compressive modulus is 43% higher, and the shear performance of the structure is basically equal. At the same time, the two-layer honeycomb core material is prone to cell dislocation (discontinuous resonance sound absorption structure), which causes the micropores blocking in the dislocation area, and the peak of the resonance absorption structure is greatly different from the theoretical value.

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History
  • Received:December 08,2021
  • Revised:February 17,2023
  • Adopted:April 06,2022
  • Online: March 29,2023
  • Published:
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