The experiment presented in this paper is to investigate and analyze the noise reduction at low frequency using stiff light composite panels. Since these composite panels are made of lightweight and stiff materials, this actuation strategy will enable the creation of composite panels for duct noise control without using traditional heavy structural mass. The results suggest that the mass-spring resonance absorption in the case of a comparatively stiff thick panel with a thin flexible plate is more efficient with minimum weight, when subjected to low-frequency (<500 Hz). The efficiency of the panel absorber depends on the mass of the thin flexible plate and the stiffness of the panel.
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机译：R. K. Potter: An Estimate of the Frequency Distribution of Atmospherec Noise. (空电杂音の周波数分布测定) Proc. of the Inst. of Radio Eng. Vol. 20, No.9, Sept. 1932.
