摘要：【中文】本发明属于噪声控制和环境保护领域，涉及一种飞机机舱用低频吸音降噪装置，包括用于隔离低频噪音的低频隔音层，该低频隔音层由周期排列的低频隔声单元组成，每个低频隔声单元均由支撑框、膜材料、两块质量块组成，支撑框上开设有周期性排布的通孔，膜材料附着在通孔上表面，质量块对称固定安装在通孔内壁上，该飞机机舱用低频吸音降噪装置，能有效隔离飞机机舱内的低频噪声，提高机舱的乘坐舒适度。 【EN】The invention belongs to the field of noise control and environmental protection, and relates to a low-frequency sound absorption and noise reduction device for an airplane cabin, which comprises a low-frequency sound insulation layer for isolating low-frequency noise, wherein the low-frequency sound insulation layer is composed of periodically arranged low-frequency sound insulation units, each low-frequency sound insulation unit is composed of a support frame, a membrane material and two mass blocks, through holes which are periodically arranged are formed in the support frame, the membrane material is attached to the upper surface of the through holes, and the mass blocks are symmetrically and fixedly arranged on the inner wall of the through holes.