Active control of sound fields in elastic cylinders by multicontrol forces
Active control of sound fields in elastic cylinders by multicontrol forces
复制标题
多控制力对弹性圆柱体声场的主动控制
DOI：
10.2514/3.10191
复制
发表时间：
1989
期刊：
影响因子：
2.5
通讯作者：
C. Fuller
中科院分区：
文献类型：
--
作者：
James D. Jones;C. Fuller
采用非加筋圆柱模型，研究了直接施加在圆柱壁上的多重控制力对飞机舱内声音传播的控制。在柱体两侧分别设置了外声单极子，以逼近螺旋桨噪声源。这使得研究一个双控制系统利用多控制力与双声学单极源的同步相结合。对于腔内的声学谐振条件，使用同相和非同相单极子的主动控制系统实现了约30 dB的空间平均降噪；然而，有效地减小声场依赖于合理地定位控制力以实现声场的最优控制。
An unstiffened cylindrical model was used to study the control of sound transmission into aircraft cabins by the use of multi-control forces applied directly to the cylinder wall. External acoustic monopoles were located on each side of the cylinder to approximate the propeller noise source. This allowed the study of a dual control system utilizing multi-control forces in conjunction with synchrophasing of the twin acoustic monopole sources. For acoustic resonant conditions within the cavity, a spatially averaged noise reduction of approximately 30 dB was achieved using the active control system for both in-phase and out-of-phase monopoles; however, effective reduction of the sound field was dependent upon judiciously positioning the control forces for optimal control of the sound field.