Effects of double-layer cylindrical shell side to side sound channel on whole shell’s vibro-acoustic performance

LOU Jingjun1,QU Duo2,TANG Yuhang3,ZHANG Zhenhai1

Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (23) : 165-170.

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PDF(2269 KB)
Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (23) : 165-170.

Effects of double-layer cylindrical shell side to side sound channel on whole shell’s vibro-acoustic performance

  • LOU Jingjun1,QU Duo2,TANG Yuhang3,ZHANG Zhenhai1
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Abstract

Aiming at the present situation of larger underwater vehicle shell radiation noise, the vehicle shell was simplified into a ribbed double-layer cylindrical shell.Considering coupling between double shell layers and inter-board/outboard fluids, the automatic matching acoustic radiation boundary condition technique AML was employed to establish a double-layer cylindrical shell model containing inter-board fluid to study the difference between the finite element vibro-acoustic coupled method and the additional mass method.Effects of inter-board/outboard fluid load, inter-board medium and pallet on the whole shell’s vibro-acoustic performance were analyzed.The results showed that the vibro-acoustic coupled method based on AML technique is more effective to study the vibro-acoustic performance of underwater double-layer cylindrical shell; inter-board/outboard different fluid loads have greater effect on the shell’s vibro-acoustic performance; water’s load effect is obviously higher than air’s, water load has effects to suppress vibration and reduce resonance peaks in lower frequency range, while it increases vibro-acoustic coupled effect to raise structural vibration response and radiation efficiency in higher frequency range; when inter-board fluid is air, pallet has larger influence on the shell’s vibration and acoustic radiation.

Key words

double-layer cylindrical shell / vibro-acoustic performance / fluid load / pallet

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LOU Jingjun1,QU Duo2,TANG Yuhang3,ZHANG Zhenhai1. Effects of double-layer cylindrical shell side to side sound channel on whole shell’s vibro-acoustic performance[J]. Journal of Vibration and Shock, 2019, 38(23): 165-170

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