Abstract:

Experimental study on active control of a submerged finite cylindrical shell using secondary force sources was performed. Through the experiment, both position and number of secondary exciters and errors sensors and excitation frequency were varied during the test to determine the influence on control effects. The results show that the underwater sound radiation of the cylindrical shell subjected to force excitation can be effectively attenuated by method of active noise control, the area of noise reduction would be enlarged with increasing the number of secondary exciter and error sensor; the active noise control of the cylindrical shell at 3000Hz is still valid；at the same time, the sound radiated from the submerged cylindrical shell subjected to multiple lines spectrum excitation can also be suppressed by introduced secondary force excitation.

摘要：

以水下有限长圆柱壳为对象，实验研究水下结构声辐射有源控制。实验中通过引入次级力源，以单个或两个误差点处的声压最小为目标函数，分析次级激振器和误差传感器布放（位置和数目）以及激励频率对控制效果的影响。结果表明：有源控制能够有效控制水下圆柱壳线谱噪声；增加次级激振器和误差传感器的数目，能够增大降噪区域；有源控制在3 000 Hz高频处对壳体噪声控制依然有效。有源控制能够对多线谱信号激励壳体辐射噪声产生抑制作用。

关键词: 声学, 弹性圆柱壳, 水下声辐射, 有源控制