Measurements of sound transmission through panels of locally resonant materials between impedance tubes

Kin Ming Ho, Z. Yang*, Xixiang Zhang, Ping Sheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

85 Scopus citations


We present a method for the measurements of complex transmission coefficient through high transmission loss samples using three-sensors, two impedance tubes, monotonic wave excitation, and phase sensitive detection. Having demonstrated the effectiveness of the method on perforated plates measurements have been made on locally resonant sonic materials (LRSMs). The transmission losses of perforated plates are found to decrease with decreasing frequency down to 120 Hz, following the mass law. For the LRSM's panels with the same area mass density but different compositions, the local resonance frequency (at which the transmission loss is maximum) is found to vary according to the predesigned value. Transmission losses as high as 96.5 dB at 630 Hz and 87 dB at 250 Hz can be measured with good accuracy, with corresponding phase spectra that match the theoretical prediction of LRSMs, confirming the reliability of the transmission data.

Original languageEnglish (US)
Pages (from-to)751-765
Number of pages15
JournalApplied Acoustics
Issue number7
StatePublished - Jul 1 2005


  • High transmission loss
  • Impedance tube
  • Local resonant sonic materials

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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