Simple Technique for Precise Measurement of Transmission Loss of Planar SoundWaves

摘要

A simple technique is proposed to measure the transmission loss through a panel of arbitrary size. The presentntechnique uses two anechoic rooms to simulate the free acoustic field. Different from the conventional methods,nthe incident angle, the sound pressure distribution, and the spectral distribution of the incident sound waves can benchanged arbitrarily. By the calibration experiments, the reasonable capabilities of the prototype facility arenconfirmed. In the experiment, a panel is installed in between two anechoic rooms. For the sake of simplicity, quasi-nplanar sound waves are provided in the sound-source room at uniform sound pressure over the panel. The intensitynof the transmitted sound waves is measured in the receiving room. The modal analyses and the transmission lossnmeasurements are completed for three differentmaterials: aluminum, honeycomb sandwich, and carbon composite.nThe results are useful to verify the numerical analyses.