The measurement and calculation methods for the sound absorption and insulation characteristics of multi-layered panel materials including double felt, ABA (absorber-barrier-absorber) and dissipative materials were proposed. The sound absorption coefficients and the insertion losses of three kinds of multi-layered panel materials were measured with the Alpha cabin equipment and in an anechoic-reverberation room, respectively. To calculate the sound absorption and insertion loss of multi-layered panel materials, the sound absorption coefficient, flow resistivity and porosity of the single-layer materials were measured. Then, the sound absorption coefficient and insertion loss of the multi-layered panel materials were estimated by using a relevant software. The comparison between the measurement and calculation results shows reasonable agreement for the insertion losses. The error between the calculation and measurement results of the sound absorption coefficient was analyzed.
Key words
multi-layered panel material /
ABA structure /
dissipative structure /
sound absorption coefficient and insulation loss /
calculation and measurement.
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