摘要：【中文】一种水下隔声结构单元，它涉及减振降噪领域，具体涉及一种水下隔声结构。本发明的目的是提供一种水下隔声频带宽、效果好、参数设计性强的水隔声结构。水下隔声结构单元包括上盖板、下盖板以及弹性元件。理论计算表明，上、下盖板为边长0.2米的正方形、水下隔声结构单元总弹性系数为2.7×10⁷N/m时，频率大于1kHz的隔声量均显著大于15dB，而将其置于水下100m在静水压作用下弹簧仅会产生1.48mm的压缩量。本发明具有结构简单，隔声效果易于控制的优点。 【EN】An underwater sound insulation structure unit relates to the field of vibration and noise reduction, in particular to an underwater sound insulation structure. The invention aims to provide a water sound insulation structure which is wide in underwater sound insulation frequency band, good in effect and strong in parameter design. The underwater sound insulation structure unit comprises an upper cover plate, a lower cover plate and an elastic element. Theoretical calculation shows that the total elastic coefficient of the underwater sound insulation structure unit with the upper cover plate and the lower cover plate being square with the side length of 0.2m is 2.7 multiplied by 10⁷At N/m, the sound insulation quantity with the frequency of more than 1kHz is obviously more than 15dB, and the spring can only generate 1.48mm of compression quantity under the action of hydrostatic pressure when the spring is placed under water at 100 m. The invention has the advantages of simple structure and easy control of sound insulation effect.

摘要：【中文】本发明公开了一种基于主辐射模态的水下圆柱壳低频声辐射预报方法。步骤1：建立圆柱壳有限元模型，计算各阶模态位移振型；步骤2：计算单位系数时每阶模态的水下辐射声功率；步骤3：进行受激振动声辐射预计算；步骤4：进行各阶模态对总辐射声功率的贡献程度分析，识别出各频段上的主辐射模态；步骤5：基于实测振动数据获得最低频段主辐射模态的模态系数；步骤6：基于实测振动数据获得其它频段主辐射模态的模态系数；步骤7：计算得到各阶主辐射模态的辐射声功率；步骤8：将各阶主辐射模态叠加得到总辐射声功率，实现辐射声功率的快递预报。本发明利用少量振动监测点，简单的步骤，可比较准确、快速的预报水下圆柱壳低频辐射声功率。 【EN】The invention discloses a prediction method of underwater cylindrical shell low-frequency sound radiation based on a main radiation mode. Step 1: establishing a cylindrical shell finite element model, and calculating modal displacement vibration modes of all orders; step 2: calculating the underwater radiation sound power of each order of mode when the unit coefficient is calculated; and step 3: performing stimulated vibration acoustic radiation pre-calculation; and 4, step 4: analyzing the contribution degree of each order of mode to the total radiated sound power, and identifying the main radiation mode on each frequency band; and 5: obtaining a modal coefficient of a main radiation mode of a lowest frequency band based on the actually measured vibration data; step 6: obtaining modal coefficients of main radiation modes of other frequency bands based on the actually measured vibration data; and 7: calculating to obtain the radiation sound power of each order of main radiation mode; and 8: and superposing the main radiation modes of all orders to obtain the total radiation sound power, thereby realizing the express forecast of the radiation sound power. The method utilizes a small number of vibration monitoring points, has simple steps, and can accurately and quickly forecast the low-frequency radiation acoustic power of the underwater cylindrical shell.

摘要：【中文】一种水下低频窄带隔声结构单元，涉及减振降噪领域，具体涉及一种水下隔声结构。舰船等水下航行器在航行中通常存在较强的低频线谱振动噪声，本发明是一种能够适用于水下的、对低频线谱噪声有良好的隔声效果的隔声结构。水下低频窄带隔声结构单元包括穿孔板、弹性元件和固定框；弹性元件一端固定在穿孔板下表面，弹性元件另一端固定在固定框上。本发明隔声结构单元具有结构简单、外形适应性强、声学设计简单的特点。本发明中穿孔板上通孔的孔隙形状可以任意选择。 【EN】An underwater low-frequency narrow-band sound insulation structure unit relates to the field of vibration and noise reduction, and particularly relates to an underwater sound insulation structure. The invention relates to a sound insulation structure which is applicable to underwater and has good sound insulation effect on low-frequency line spectrum noise. The underwater low-frequency narrow-band sound insulation structure unit comprises a perforated plate, an elastic element and a fixed frame; one end of the elastic element is fixed on the lower surface of the perforated plate, and the other end of the elastic element is fixed on the fixed frame. The sound insulation structure unit has the characteristics of simple structure, strong appearance adaptability and simple acoustic design. The shape of the pores of the through holes on the perforated plate can be selected at will.