CAJ | 학술논문

计算变截面扩散吸声体的内阻抗和辐射阻抗，从理论上分析变截面扩散吸声体的声学特性，利用扩散吸声体表面的非线性阻抗和增加蒙布两种办法，均可以使扩散吸声体的内阻抗和辐射阻抗在广大频率范围内匹配良好，从而获得良好的宽频吸声能力。实验研究表明，在没有蒙布的情况下，仅仅利用非线性阻抗，扩散吸声体的吸声系数在100 Hz～2000 Hz范围内超过0.7，在500 Hz～800 Hz超过1；有蒙布的情况下，其吸声系数在100 Hz～4000 Hz超过0.7，在250 Hz～2000 Hz范围内超过1.0。变截面扩散吸声体的吸声效率高，结构体积小，可在小房间的声学设计中起到关键的作用。
계산변절면확산흡성체적내조항화복사조항，종이론상분석변절면확산흡성체적성학특성，이용확산흡성체표면적비선성조항화증가몽포량충판법，균가이사확산흡성체적내조항화복사조항재엄대빈솔범위내필배량호，종이획득량호적관빈흡성능력。실험연구표명，재몰유몽포적정황하，부부이용비선성조항，확산흡성체적흡성계수재100 Hz～2000 Hz범위내초과0.7，재500 Hz～800 Hz초과1；유몽포적정황하，기흡성계수재100 Hz～4000 Hz초과0.7，재250 Hz～2000 Hz범위내초과1.0。변절면확산흡성체적흡성효솔고，결구체적소，가재소방간적성학설계중기도관건적작용。
The internal impedance and radiation impedance of a variable cross-section diffsorber were calculated, when adding bandage to the nozzle of tubes of diffsorber, or using non-linear sound resistance to provide appropriate additional internal resistance, the diffsorber will become an excellent sound absorber. Without bandage, the absorption coefficient of the testing sample is larger than 0.7 during 100 Hz~2 000 Hz, and exceed 1 during 500 Hz~800 Hz; with bandage, the absorption coefficient of the testing samples is no less than 0.7 during100 Hz~4 000 Hz, and is above 1 during 250 Hz~2 000 Hz. Due to its high efficiency and small volume, it may be very useful in the acoustical design of small rooms.