The Active Control of Sound Radiated from a Finite Elastic Cylindrical Shell in Water
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摘要: 研究了利用次级环带声源对水下有限长弹性圆柱壳结构振动声辐射进行有源控制。给出了初级圆柱和次级环带声源之间的互辐射阻抗计算公式,考虑流固耦合效应,利用二次最优理论,以辐射声功率最小化为目标函数,得到次级环带声源的最优激励力,最后计算控制前后远场辐射声压的空间分布。结果表明:利用次级环带声源可以对弹性圆柱壳结构振动辐射噪声进行控制,增大次级环带声源与初级圆柱壳间距,控制效果变差;次级激励力位置对辐射声功率控制效果也会产生影响。Abstract: In this paper, active control of sound radiated from an underwater finite elastic cylindrical shell by using secondary cylindrical-ringed sound source is investigated. First, the interaction radiation impedance between the primary cylindrical shell and secondary sound source is calculated. Then considering fluid-structure interaction effects and using quadratic optimal theory, the optimal excitation force of secondary source is derived with the mini-mization of the radiated sound power. Finally, the far-filed sound pressure is observed and compared before and af-ter control. The results show that the noise radiated from the finite elastic cylindrical shell can be controlled by using secondary cylindrical ringed sound source, the effects becomes poor with the increase of the distance between the primary cylindrical shells and secondary source, and the secondary excitation position also have an significant influ-ence on active sound control.
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Key words:
- calculations /
- control /
- natural frequencies
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