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A mixed method for measuring low-frequency acoustic properties of macromolecular materials |
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| Authors: | LIU Hongwei YAO Lei ZHAO Hong ZHANG Jichuan XUE Zhaohong |
| Affiliation: | 1. National Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100080,China 2. National Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing,100080,China;Graduate University of Chinese Academy of Sciences,Beijing,100049,China 3. Institute of Chemistry,Chinese Academy of Sciences,Beijing,100080,China;Graduate University of Chinese Academy of Sciences,Beijing,100049,China 4. Institute of Chemistry,Chinese Academy of Sciences,Beijing,100080,China |
| Abstract: | A mixed method for measuring low-frequency acoustic properties of macromolecular materials is presented. The dynamic mechanical parameters of materials are first measured by using Dynamic Mechanical Thermal Apparatus(DMTA) at low frequencies, usually less than 100 Hz; then based on the Principles of Time-Temperature Superposition (TTS), these parameters are extended to the frequency range that acousticians are concerned about, usually from hundreds to thousands of hertz; finally the extended dynamic mechanical parameters are transformed into acoustic parameters with the help of acoustic measurement and inverse analysis. To test the feasibility and accuracy, we measure a kind of rubber sample in DMTA and acquire the basic acoustic parameters of the sample by using this method. While applying the basic parameters to calculating characteristics of the sample in acoustic pipe, a reasonable agreement of sound absorption coefficients is obtained between the calculations and measurements in the acoustic pipe. |
| Keywords: | low-frequency acoustic properties dynamic mechanical properties Principles of Time-Temperature Superposition acoustic pipe sound absorption coefficient |
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