The low frequencies radiation characteristics of a submerged cylindrical shell and active control

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (20) : 185-190.

DING Shao-hu1,2，CHEN Ke-an1，LI Shuang3

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Abstract

The radiation characteristics of a submerged finite cylindrical shell at low frequencies are investigated based on vibration modes and acoustic radiation modes. Firstly, the contribution of the individual circumferential vibration modes to the radiated sound is observed. Then, under the certain circumferential mode, the vibration modes are divided respectively into an axial odd-modes group and an axial even-modes group, and the relationship between the vibration modes group and the acoustic radiation modes at low frequency is given. The results show that at low frequencies, only the first few circumferential vibration modes contribute to the sound power radiated from a submerged finite cylindrical shell excited by the radial point force; under the certain circumferential mode, the sound power radiated from the odd (even) axial vibration modes group corresponds to the acoustic radiation mode with the same circumferential mode and even (odd) axial vibration modes. The sound power radiated from a submerged finite cylindrical shell can be controlled by the sound power of the dominant radiation modes as a target function.

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submerged cylindrical shell / vibration modes / acoustic radiation modes / active control

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DING Shao-hu1,2，CHEN Ke-an1，LI Shuang3. The low frequencies radiation characteristics of a submerged cylindrical shell and active control[J]. Journal of Vibration and Shock, 2015, 34(20): 185-190

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