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以有限长加筋板和敷设阻尼加筋板为对象,通过模型试验分析了单频激励和白噪声激励下的加筋板在空气中、水中的振动和声辐射,针对计算模型开展相应的数值分析.结果表明:加筋板敷设阻尼层后,结构的振速级峰值左移.阻尼层在整个频带体现出较好的抑振降噪效果,但在低频区降噪效果不明显,甚至在局部频点出现失效区.在同等激励条件下,其辐射声压级普遍降低.数值分析进一步验证阻尼层对抑制振动与声辐射非常有效.
Taking finite-length stiffeners and damping stiffened plates as objects, the vibration and sound radiation of stiffened plates in air and water excited by single-frequency excitation and white-noise excitation were analyzed by model tests. Corresponding numerical values The results show that after the damping layer is laid on the stiffened plate, the peak value of the vibration velocity of the structure shifts to the left, while the damping layer shows good vibration suppression and noise reduction effect in the whole frequency band, but the noise reduction effect is not obvious in the low frequency region, At the same frequency, the sound pressure level of radiation is generally reduced, and the numerical analysis further verifies that the damping layer is very effective in suppressing vibration and sound radiation.