有限长圆柱壳结构水下声辐射有源控制实验

摘要

Experimental study on active control of a submerged cylindrical shell with finite length is performed using secondary force sources. The arrangement of the secondary exciters and error sensors and the influence of the excitation frequency on the control effects are analyzed. The results show that the underwater sound radiation of the cylindrical shell subjected to the force excitation can be effectively attenuated by the method of active noise control, the area of noise reduction can be enlarged with increasing the numbers of secondary exciters and error sensors, and the active noise control of the cylindrical shell at 3 000 Hz is still valid. Meanwhile, the sound radiated from the submerged cylindrical shell subjected to multiple linear spectrum excitations can also be suppressed by the active noise control.%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3000 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。